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Recombinant herpesvirus of turkeys and live vector vaccines derived thereof
The present invention is concerned with a recombinant Herpesvirus of Turkeys (HVT), containing a heterologous gene incorporated into an insertion region of the genome of HVT. The invention also relates to a vector vaccine comprising such a recombinant HVT which expresses a heterologous antigenic polypeptide and induces an adequate immune response on infection of an appropriate host animal.
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The present invention is concerned with a recombinant Herpesvirus of Turkeys (HVT) containing a heterologous nucleic acid sequence introduced into an insertion region of the HVT genome, a nucleic acid sequence comprising a heterologous gene flanked by DNA sequences derived from said insertion region of the HVT genome, a plasmid comprising said nucleic acid sequence, a process for the preparation of a recombinant HVT, a cell culture infected with a recombinant HVT, a vaccine comprising recombinant HVT as well as a process for the preparation of such a vaccine and antiserum comprising antibodies directed against a recombinant HVT.
Marek's disease (MD) is an oncogenic lymphoproliferative disorder of chickens which results in T-cell lymphomas and peripheral nerve demyelination and is a major cause of economic loss to the poultry industry.
Marek's disease virus (MDV) has been identified as the etiologic agent of MD.
A prototype MD vaccine consists of Herpesvirus of Turkeys (HVT), a serotype 3 MD virus originally isolated from turkeys. Its lack of pathogenicity, oncogenicity, its good replication in vivo and in vitro, availability as cell-free and cell-associated preparations and high protective efficacy have established HVT as a very successful and widely used safe vaccine for the effective control of Marek's disease in poultry.
At present, in general, animals can be protected against infection of pathogenic microorganisms with live or inactivated vaccines or by vaccines derived from subunits of the relevant pathogens.
However, these types of vaccines may suffer from a number of drawbacks. Using attenuated live viral vaccines always involves the risk of inoculating animals with inadequately attenuated pathogenic microorganisms. In addition the attenuated viruses may revert to a virulent state resulting in disease of the inoculated animals and the possible spread of the pathogen to other animals.
Inactivated vaccines generally induce only a low level of immunity, requiring additional immunizations. Furthermore, the neutralization inducing antigenic determinants of the viruses may become altered by the inactivation treatment, decreasing the protective potency of the vaccine.
Moreover, a problem with combined live viral vaccines is the mutual influence of the antigenic components resulting in a decrease of the potency of one or more of the constituting components.
A recombinant or naturally derived subunit vaccine also displays a number of disadvantages. First, a polypeptide subunit presented to the immune system as a nonreplicating structure often does not elicit long-lasting immunity requiring also the presence of an adjuvant. Secondly, a presentation as a replicating structure can elicit immunity more efficiently than can a presentation as a subunit structure.
It is an object of the present invention to provide a recombinant HVT which can be used not only for the preparation of a vaccine against MD but also against other infectious diseases of poultry, which obviates any potential risk associated with the use of a live attenuated pathogen as a vaccine, which stimulates both the humoral and cellular immune system in a potent way without the explicit need of an adjuvant and which offers the possibility of a multivalent vaccine without the risk of adverse mutual interference of different antigenic components.
According to the present invention such a recombinant HVT is characterized in that it contains a heterologous nucleic acid sequence encoding a polypeptide heterologous to HVT, said nucleic acid sequence being introduced in an insertion region of the HVT genome which corresponds with the genomic region from the end of ORF-1 up to and including ORF-5 as shown in FIG. 1 and located within a DNA fragment of the HVT genome having a restriction enzyme map essentially defined by FIG. 1.
FIG. 1 is a restriction enzyme map of a DNA fragment essentially corresponding to the Us region of the HVT genome.
FIG. 2A is a restriction map of pMD07gal.
FIG. 2B is a restriction map of pMD12gal.
FIG. 3A is a restriction map of pMD12.
FIG. 3B is a restriction map of pMD44.
FIG. 4 is a restriction enzyme map of pVEC04 with the LTR promotor inserted.
FIG. 5 is a restriction enzyme map of pIB18 showing the 3.7 kb BamHI fragment carrying the spike gene from IBV strain M41 inserted into the BglII site of pVEC04 downstream of the LTR promotor.
FIG. 6A is a restriction map of pNDV04.
FIG. 6B is a restriction map of pNDV05.
The recombinant HVT according to the invention can be derived from any HVT strain, e.g. PB-THV1 (commercially available from Intervet International) or strain FC126.
The term "recombinant HVT" as used herein denotes infective virus which has been genetically modified by the incorporation into the virus genome of a heterologous nucleic acid sequence, i.e. DNA which codes for a gene or part thereof not identical to the nucleic acid sequence of a gene naturally present in HVT.
On infection of a cell by the recombinant HVT, the recombinant HVT expresses the heterologous gene in the form of a heterologous polypeptide.
The term "polypeptide" refers to a molecular chain of amino acids with a biological activity, does not refer to a specific length of the product and if required can be modified in vivo or in vitro, for example by glycosylation, amidation, carboxylation or phosphorylation; thus inter alia peptides, oligopeptides and proteins are included within the definition of polypeptide.
The prerequisite for a useful recombinant HVT is that the heterologous nucleic acid sequence is incorporated in a permissive position or region of the genomic HVT sequence, i.e. a position or region which can be used for the incorporation of a heterologous sequence without disrupting essential functions of HVT such as those necessary for infection or replication. Such a region is called an insertion region.
The insertion region refered to in the present invention has not been previously described for the incorporation of heterologous DNA without disrupting essential functions of HVT. Moreover, no information has been available with regard to the restriction enzyme map of the genomic region of HVT used to incorporate a heterologous DNA sequence as described herein.
The insertion region used to incorporate a heterologous DNA sequence in order to prepare a recombinant HVT according to the invention is located within a 17.5 kb restriction fragment generated by partial digestion of genomic HVT DNA with the enzyme Sau3A.
Said fragment is analyzed in detail by restriction enzyme mapping (FIG. 1) and essentially corresponds to the Unique short ("US") region of the HVT genome, probably including flanking parts of the short internal repeat ("IRs") and short terminal repeat ("TRs") structures. The relative positions of the Us region and the IR.sub.s and TR.sub.S structures within the HVT genome are shown by Igarashi et al. (1987).
The insertion region disclosed herein is located within three contiguous XhoI fragments of about 1.2 kb, 3.5 kb and 2.8 kb respectively, and begins at the end of an open reading frame (ORF-1) starting at a position in the HVT genome leftwards of the 1.2 kb XhoI fragment (FIG. 1). Said insertion region of about 5 kb continues through the ORF's, 2, 3, 4 and 5 including the non-coding sequences in between. DNA sequences corresponding to the insertion region outlined above can be applied for the insertion of genes into the HVT genome without disrupting essential functions of the virus.
Particularly, ORF-2 and ORF-3 can be applied for the integration of foreign genes.
Preferred insertion sites for foreign genes within ORF-2 and ORF-3 are the unique BglII restriction sites shown in FIG. 1.
The .beta.-galactosidase gene is inserted at either of the unique BglII restriction sites within ORF-2 and ORF-3 resulting in a recombinant virus which is viable and stable and not only replicates in tissue culture but also infects chickens to a comparable extent as the HVT virus from which it has been derived. E. coli transformed with plasmids designated pMD07gal or pMD12gal (FIG. 2), derived by insertion of the .beta.-gal gene into the unique BglII site of pMD07 and pMD12 which carry the respective XhoI fragments as indicated in FIG. 1, are deposited at the C.N.C.M. of the Institute Pasteur at Paris under accession number I-914 and I-915.
In another example significant parts of the ORF-4 and ORF-5 have been deleted from the HVT genome and replaced by the .beta.-galactosidase marker gene resulting in recombinant viruses comparable with recombinant HVT viruses comprising an insertion of the marker gene in ORF-2 or ORF-3.
It will be understood that for the DNA sequence of the HVT genome, natural variations can exist between individual HVT viruses. These variations may result in deletions, substitutions, insertions, inversions or additions of one or more nucleotides which possibly influence the position of one or more restriction sites, thus affecting the restriction enzyme map shown in FIG. 1.
Moreover, the potential exists to use genetic engineering technology to bring about above mentioned variations resulting in a DNA sequence with a restriction enzyme map related to the map shown in FIG. 1. It is clear that a recombinant HVT comprising a heterologous gene incorporated into an insertion region located within an HVT genomic region characterized by such a related restriction enzyme map is also included within the scope of the present invention. Furthermore, as the insertion region identified according to the present invention does not display essential functions, said region can be deleted partially or completely, whereafter a heterologous gene can be incorporated into said deletion. It will be understood that a recombinant HVT comprising a heterologous gene incorporated into a region of the HVT genome corresponding to the insertion region of the present invention and characterized herein also forms part of the invention.
In summary, the insertion region essentially defined above characterizes the localization of a region within the HVT genome which can be used to incorporate a heterologous nucleic acid sequence.
It is a preferred object of the present invention to provide a recombinant HVT that contains a heterologous nucleic acid sequence which is incorporated into an insertion region essentially characterized by the HVT DNA sequence as shown in SEQ ID NO: 1, containing four ORF's. ORF-2, a small open reading frame of 209 amino acids (SEQ ID NO: 2) is located between nucleotide positions 316 and 945 and contains the BglII restriction site from pMD07 used for the insertion of genes into the HVT genome (FIG. 1, SEQ ID NO: 1), thereby indicating that the hypothetical polypeptide encoded for by ORF-2 does not have an essential function for maintenance of the virus in vivo or in vitro. This also applies for ORF-3, comprising 346 amino acids (SEQ ID NO: 3), which is translated in the reverse orientation between nucleotide positions 1084 and 2124 (complementary), and contains the BglII restriction site which is used in pMD12 for the insertion of genes into the HVT genome (FIG. 1, SEQ ID NO: 1). ORF-4 is transcribed towards the IR.sub.s between nucleotide positions 2322 and 3170 (complementary, FIG. 1, SEQ ID NO: 1) and encodes 282 amino acids (SEQ ID NO: 4) while ORF-5 starts at nucleotide position 3320 and continues up to nucleotide position 4504 (FIG. 1, SEQ ID NO: 1) encoding a polypeptide of 394 amino acids (SEQ ID NO: 5).
According to the invention a continuous DNA stretch of the HVT genome of about 5 kb starting after the end of ORF-1 at nucleotide position 82 essentially characterized by the DNA sequence shown in SEQ ID NO: 1, comprising four open reading frames and non-coding sequences in between, can be applied for the insertion of heterologous genes into the HVT genome without disrupting essential functions of the virus.
Particularly, the DNA stretches between nucleotide positions 316-945, 1084-2124, 2322-3170 and 3320-4504 shown in SEQ ID NO: 1 have been defined for the integration of foreign genes, the unique BglII restriction sites being the most favoured sites for insertion.
It is clear that for the DNA sequence shown in SEQ ID NO: 1, characterizing the insertion region according to the present invention, natural variations exist between individual HVT viruses resulting in deletions, substitutions, insertions, inversions etc. of one or more nucleotides. These variations can also be brought about by genetic engineering. Recombinant HVT comprising a heterologous gene incorporated into such a region of the HVT genome related but not identical to the insertion region characterized above, also is included within the present invention. For example a heterologous gene can be incorporated into a deletion brought about in the nucleic acid sequence of the HVT genome shown in SEQ ID NO: 1. The HVT insertion region defined herein by the DNA sequence shown in SEQ ID NO: 1 characterizes the localization of a region within the HVT genome which can be used to incorporate a heterologous nucleic acid sequence.
The heterologous nucleic acid sequence to be incorporated into the HVT genome according to the present invention can be derived from any source, e.g. viral, prokaryotic, eukaryotic or synthetic. Said nucleic acid sequence can be derived from a pathogen, preferably an avian pathogen, which after insertion into the HVT genome can be applied to induce immunity against disease. Preferably, nucleic acid sequences derived from Infectious Bronchitis Virus (IBV), Marek's Disease Virus (MDV), Newcastle Disease Virus (NDV), Infectious Bursal Disease Virus (IBDV), Chicken Anemia Agent (CAA), Reovirus, Avian Retrovirus, Fowl Adenovirus, Turkey Rhinotracheitis Virus, Eimeria species, Salmonella species, Escherichia coli and Mycoplasma gallisepticum are contemplated for incorporation into the insertion region of the HVT genome.
Furthermore, nucleic acid sequences encoding polypeptides for pharmaceutical or diagnostic applications, in particular immune modulators such as lymphokines, interferons or cytokines, may be incorporated into said insertion region.
An essential requirement for the expression of the heterologous nucleic acid sequence in a recombinant HVT is an adequate promotor operably linked to the heterologous nucleic acid sequence. It is obvious to those skilled in the art that the choice of a promotor extends to any eukaryotic, prokaryotic or viral promotor capable of directing gene transcription in cells infected by the recombinant HVT, e.g. promotors derived of the retroviral long terminal repeat, SV40 or promotors present in HVT.
The technique of in vivo homologous recombination can be used to introduce the heterologous nucleic acid sequence into the HVT genome. This is accomplished by first constructing a recombinant DNA molecule for recombination with HVT. Such a molecule may be derived from any suitable plasmid, cosmid or phage, plasmids being most preferred, and contains a heterologous nucleic acid sequence, if desired operably linked to a promotor. Said nucleic acid sequence and promotor are introduced into a fragment of genomic HVT DNA containing insertion region sequences as defined herein subcloned in the recombinant DNA molecule. The insertion region sequences which flank the heterologous nucleic acid sequence should be of appropriate length as to allow in vivo homologous recombination with the vital HVT genome to occur. If desired, a construct can be made which contains two or more different heterologous nucleic acid sequences derived from e.g. the same or different pathogens said sequences being flanked by insertion region sequences of HVT defined herein. Such a recombinant DNA molecule can be employed to produce recombinant HVT which expresses two or more different antigenic polypeptides to provide a multivalent vaccine. Secondly, cells, e.g. chicken embryo fibroblasts (CEF), can be transfected with HVT DNA in the presence of the recombinant DNA molecule containing the heterologous nucleic acid sequence flanked by appropriate HVT sequences whereby recombination occurs between the insertion region sequences in the recombinant DNA molecule and the insertion region sequences in HVT. Recombination can also be brought about by transfecting the infected cells with a nucleic acid sequence containing the heterologous nucleic acid sequence flanked by appropriate flanking insertion region sequences without recombinant DNA molecule sequences. Recombinant viral progeny is thereafter produced in cell culture and can be selected for example genotypically or phenotypically, e.g. by hybridization, detecting enzyme activity encoded by a gene co-integrated along with the heterologous nucleic acid sequence or detecting the antigenic heterologous polypeptide expressed by the recombinant HVT immunologically. The selected recombinant HVT can be cultured on a large scale in cell culture whereafter recombinant HVT containing material or heterologous polypeptides expressed by said HVT can be collected therefrom.
According to the present invention a live recombinant HVT expressing one or more different heterologous polypeptides of specific pathogens can be used to vaccinate animals, particularly avian species such as chickens, turkeys, quails, pigeons and guinea fowl susceptible to these pathogens. Vaccination with such a live vector vaccine is preferably followed by replication of the recombinant HVT within the inoculated host, expressing in vivo the heterologous polypeptide along with the HVT polypeptides. The heterologous immunogenic polypeptides will then elicit an immunological response to said polypeptides as well as to HVT itself. If the heterologous polypeptide derived from a specific pathogen can stimulate a protective immune response, then the animal inoculated with a recombinant HVT according to the invention will be immune to subsequent infection by that pathogen as well as to infection by MDV. Thus, a heterologous nucleic acid sequence incorporated into the insertion region of the HVT genome according to the invention may be continuously expressed in vivo, providing a solid, safe and long lasting immunity to a pathogen.
A recombinant HVT according to the invention containing and expressing one or more different heterologous polypeptides can serve as a monovalent or multivalent vaccine.
A recombinant HVT according to the invention can also be used to prepare an inactivated vaccine.
For administration to animals, the recombinant HVT according to the presentation can be given inter alia by aerosol, drinking water, orally, in ovo inoculation, intradermally, subcutaneously or intramuscularly.
It is a further object of the present invention to produce subunit vaccines, pharmaceutical and diagnostic preparations comprising a heterologous polypeptide expressed by a recombinant HVT according to the invention. This can be achieved by culturing cells infected with said recombinant HVT under conditions that promote expression of the heterologous polypeptide. The heterologous polypeptide may then be purified with conventional techniques to a certain extent depending on its intended use and processed further into a preparation with immunizing, therapeutic or diagnostic activity.
The above described active immunization against specific pathogens will be applied as a protective treatment in healthy animals. It goes without saying that animals already infected with a specific pathogen can be treated with antiserum comprising antibodies evoked by a recombinant HVT according to the invention comprising a heterologous gene derived from the specific pathogen encoding an antigenic polypeptide. Antiserum directed against a recombinant HVT according to the invention can be prepared by immunizing animals, for example poultry, with an effective amount of said recombinant HVT in order to elicit an appropriate immune response. Thereafter the animals are bled and antiserum can be prepared.
1. Isolation of subfragments from the Us region of the HVT genome
Chicken embryo fibroblasts (CEF) were infected with virus from HVT vaccine strain PB-THV1 (commercially available from Intervet International, Holland) and incubated for 48 hours in roller bottles until the cultures reached 90% cytopathic effect (CPE). Cells were harvested, washed with phosphate buffered saline (PBS), centrifuged and resuspended in 20 mM Tris-HCl, pH 7.5, 10 mM EDTA at a density of 1 to 5.times.10.sup.8 cells per ml. SDS was added to 0.5% final concentration and proteinase K (Boehringer) to 200 .mu.g/ml. After 2 hours incubation at 37.degree. C., an additional 100 .mu.g/ml of proteinase K was added and incubation was continued for 1 hour. The solution was extracted twice with a mixture of phenol/chloroform (1:1) and nucleic acids were precipitated with ethanol. Total DNA from infected cells was dissolved in TE (10 mM Tris-HCl, pH 7.5, 1 mM EDTA) at a concentration of 0.5 mg/ml. Ten microgram of the DNA was incubated with 0.5 unit of Sau3A (Promega) for 10' at 37.degree. C. in a 100 .mu.l reaction volume according to the conditions recommended by the enzyme supplier. Reaction products were seperated on a 0.8% agarose gel and the size fraction between 16 and 20 kb was isolated. Hundred nanograms of these DNA fragments were ligated overnight at +4.degree. C. with 1 .mu.g of BamHI/EcoRI digested .lambda.EMBL3 DNA (Promega) in 10 .mu.l of 30 mM Tris-HCl, pH 7.5, 10 mM MgCl.sub.2, 10 mM DTT, 0.1 mM ATP, adding 1 U of T.sub.4 DNA ligase (Boehringer). After ligation, one tenth of the reaction mixture was digested with BamHI in a 10 .mu.l volume and DNA was packaged in vitro using commercial extracts (Promega). Recombinant phage was plated on appropriate E. coli host strain such as LE392 or K802 at a density of about 100 pfu/plate. Replicas of the dishes were prepared in duplicate using nitrocellulose filters according to Benton & Davis (1978). The first set was hybridized (Maniatis et al., 1982) with .sup.32 P-labelled DNA from uninfected CEF and the second with .sup.32 p-labelled DNA from HVT infected cells. After washing and exposure to X-ray film, images of the duplicate filters were superimposed in the correct orientation and several of the plaques giving a signal specifically with the probe made from infected cell were isolated and phage from it was amplified. One of these candidates, designated .lambda.HVT04, was analyzed in detail by restriction mapping of the 17.5 kb insert (FIG. 1). The sequence present in this fragment corresponded essentially to the Us region of the HVT genome, including flanking parts of the repeat structures (Igarashi, et al., 1987).
2. Insertion of .beta.-galactosidase gene into the HVT genome using subfragments of the Us region
Two of the XhoI fragments present in the insert of .lambda.HVT04 contained a unique BglII restriction site at the proper position in order to allow the in vivo recombination event with intact viral genomic DNA to take place. These two fragments were subcloned from .lambda.HVT04 by XhoI digestion and ligation with the plasmid vector pGEM3Z (Promega) digested with SalI. The resulting plasmid constructs pMD07 and pMD12, carrying the XhoI fragments as indicated in FIG. 1, were linearized by means of the unique BglII restriction site and ligated with a 4.0 kb expression cassette flanked by BamHI sites and containing the .beta.-galactosidase gene from E. coli controlled by the early promotor from SV40. This expression cassette has been derived from pCH110, a plasmid commercially available from Pharmacia, by replacing a 72 bp SphI fragment near the SV40 origin of replication as present in pCH110 by a double stranded synthetic oligonucleotide with the following structure:
Insertion of the linker between the two SphI restriction sites of pCH110 does not restore the recognition sequence for SphI on either site and creates both a BamHI and SalI site upstream of the SV40 early promotor. Subsequent digestion of this construct with BamHI generates a 4.0 kb expression cassette used above for insertion in the BglII site from pMD07 and pMD12, thereby resulting in the plasmids pMD07gal and pMD12gal for which the restriction maps are shown in FIG. 2. Linearized DNA of the plasmids pMD07gal and pMD12gal was introduced together with total DNA prepared from HVT infected cells into CEF by a method based on the calcium phosphate DNA precipitation according to Graham and v.d. Eb (1973). Two micrograms of plasmid DNA from the constructs containing the .beta.-galactosidase gene flanked by HVT homologous sequences were mixed with 15 .mu.g of DNA from HVT infected cells in a final volume of 560 .mu.l H.sub.2 O and added to 750 .mu.l of HBSP (20 mM KCl, 560 mM NaCl, 24 mM glucose, 3 mM Na.sub.2 HPO.sub.4, 100 mM HEPES, pH 7.0). Precipitates were formed by gradually adding 190 .mu.l of 1M CaCl.sub.2 solution and incubating the mixtures at room temperature for 30 minutes. In the meantime, 15 ml of a suspension of secondary CEF from 10 day old embryos in medium 6/B8, for which the composition is based on Glasgow's modification of Eagle's Minimal Essential Medium supplemented with 2% of fetal calf serum, were seeded in o 10 cm dishes at a density of 5 .times.10.sup.5 cells per ml. Calcium phosphate precipitated DNA was gently added to the cell suspension and dishes were incubated at 37.degree. C. in a humidified incubator containing 5% CO.sub.2 in air. After 5 hours, medium was removed and 10 ml of a solution containing equal volumes of HBSP and 30% glycerol was layered onto the cells. After a one to two minute incubation, the solution was removed, cells were washed with medium 6/B8 and dishes were incubated with fresh medium for 3 to 5 days until viral CPE developed. Plaques that contained recombinant HVT virus expressing .beta.-galactosidase activity were identified by their capacity to convert the substrate Bluogal (Gibco-BRL), a chemical derivative of 5-bromo-4-chloro-3-indolyl-.beta.-D-galactoside, into a blue reaction product. Plates were stained with 0.2 mg/ml of Bluogal freshly dissolved in dimethylsulfoxide and incubated until blue plaques were detected. Transfection with the .beta.-galactosidase derivatives from pMD07 and pMD 12, all resulted in a significant (>5) percentage of blue plaques. Positive plaques from the transfection series with pMD07 and pMD12 were picked macroscopically and mixed with fresh CEF in order to amplify the virus. Cells were harvested when CPE was visible and lysates were prepared in Calstab buffer (74.35 g sucrose, 0.52 g KH.sub.2 PO.sub.4, 2.58 g Na.sub.2 HPO.sub.4.2H.sub.2 O and 0.92 g sodium glutaminate per liter of H.sub.2 O) including 1% of bovine serum albumin, by sonifying plastic tubes containing the extract in a Vibracell 300 cup horn device for 3 minutes at 15.degree. C. Cell free virus was plated on fresh CEF for titration and plaques containing blue-staining recombinant HVT virus were detected and amplified as described above. This cycle was repeated until more than 95% of the viral plaques scored positive when staining the cultures with Bluogal. In particular four clones, designated as A4-1/A10-4 both derived from pMD07 and E1/E2 derived from pMD12, were selected for the preparation of virus stocks which served the vaccination experiments in chickens. In addition, part of the stock was used for the preparation of total DNA from infected CEF. DNA digested with XhoI was run on agarose gels and transferred to nitrocellulose sheets according to Maniatis et al. (1982). Hybridizations of the samples from A4-1/A10-4 and E1/E2 in comparison to XhoI digested DNA of the non-recombinant HVT virus, using the non-disrubted XhoI fragments as probes, indicated the expected increase in size of the original fragments in pMD07 and pMD12 due to the insertion of the .beta.-galactosidase cassette.
The .beta.-galactosidase marker gene was used to show that also ORF-4 and ORF-5 represented a potential insertion region. For this purpose, the 1117 bp SpeI fragment in pMD12 between nucleotide position 2311 in ORF-4 and 3428 in ORF-5, was replaced by a synthetic 16 base double stranded oligomer creating a new and unique Sal I site in pMD12 thereby deleting a significant part of both ORF-4 and ORF-5. The restriction map of this plasmid, designated pMD40, is presented in FIG. 3A, The .beta.-galactosidase marker gene used for insertion was derived from pCH110 (Pharmacia) by first exchanging the unique Bam HI site with Sal I and subsequently replacing the 72 bp SphI fragment by a double stranded synthetic linker containing both a Bam HI and Sal I restriction site as described above.
The .beta.-galactosidase marker gene is now located on a 4.0 kb DNA fragment flanked by Sal I sites and can be transfered as such to the newly created Sal I site in pMD40, thereby resulting in plasmid pMD44 (see FIG. 3B).
Linearized DNA of pMD44 is co-transfected with DNA from HVT infected cells into secundary CEF as described above. Plates are incubated until CPE has developed. Staining of the culture dishes with Bluogal identified a significant percentage of HVT plaques expressing .beta.-galactosidase activity.
These results were comparable with initial observations made after insertion of the marker gene in ORF-2 and ORF-3.
Vaccination of chickens with recombinant HVT expressing .beta.-galactosidase activity
White leghorn day-old chickens were inoculated i.m. with either 50 or 1000 pfu of the virus stocks A4-1 and E1. An equal dose of the parental HVT vaccine strain PB-THVI was given to the control animals, At days 8 and 15, blood samples were collected and white blood cells were separated on Ficoll/Hypaque gradients. White blood cells were inoculated onto secondary CEF and the number of plaques was determined relative to the number of cells inoculated. The results of these titrations are shown in Table 1 and demonstrate that recombinant HVT virus, containing a .beta.-galactosidase gene inserted in either of the unique BglII restriction sites within each of the XhoI subfragments present in pMD07 and pMD12 respectively, was able to induce viremias in chickens at comparable times and levels relatively to the non-recombinant PB-THVI vaccine strain. Staining with Bluogal of some of the white blood cell titrations on CEF showed that >90% of the virus recovered from the infected birds still expressed the .beta.-galactosidase gene. In addition, significant ELISA antibody titres to .beta.-galactosidase were demonstrated in the serum samples of individual animals 35 days after inoculation. Therefore, it was concluded that a particular region of the Us from the HVT genome, as defined by the contiguous sequence present in pMD07 and pMD12, can be used for the stable integration of foreign genes without affecting essential functions of the HVT virus such as those necessary for infection and replication. In addition, it could be shown that a foreign gene inserted in this region does express a functional protein which can induce high levels of antibody titres in the serum of infected animals.
TABLE 1 ______________________________________ Viremia of white blood cells (WBC) induced by recombinant HVT 8 days p.v. 15 days p.v Nos. cells Nos. cells Dose calculated inoculated calculated inoculated Virus (pfu) plaques (.times. 10.sup.5) plaques (.times. 10.sup.5) ______________________________________ A4-1 50 8* 6.8 21 14.7 1* 1.5 44 35.5 20 3.2 17 27.5 A4-1 1000 30 5.7 7 28.2 8* 1.5 20 16.5 13 1.2 18 30.7 7* 1.7 E1 50 95 0.7 14 10.7 1600 3.3 150 17.2 170 2.5 55 9.0 2* 1.8 85 13.7 1* 2.1 30 13.5 E1 1000 2* 1.8 24 19.2 1* 1.3 75 30.5 15 5.2 15 25.0 PB1 50 13 1.7 110 14.5 26 1.5 130 34.2 27 3.0 110 14.5 12 3.7 290 20.2 6* 2.0 36 8.2 PB1 1000 110 6.5 32 15.5 185 4.0 600 122.5 1150 4.7 280 19.5 65 3.0 345 6.7 330 3.0 175 27.5 ______________________________________ *read 5 days after inoculation of WBC on CEF plates other read after 3 days post inoculation
Sequence analysis of part of the Us region of HVT
The inserts of plasmids pMD07 and pMD12, corresponding to the respective XhoI restriction fragments from the HVT genome as shown in FIG. 1, were submitted to detailed nucleotide sequence analysis using double stranded DNA preparations in dideoxy chain termination reactions according to Sanger et al. (1977). Priming of the reaction was done from within the SP6 and T7 promotor sites in the pGEM3Z plasmid vector flanking the respective HVT genomic fragments. The analysis was completed by introducing progressive deletions entering the respective fragments in one orientation only. These progressive deletions were introduced using the enzyme Exonuclease III, a single strand exonuclease only recognizing double stranded DNA and hydrolizing one strand of the duplex in the 3' to 5' orientation. Selecting a restriction site that creates a 5'-overhanging or blunt-ended extremity near the end of the fragment to be analyzed, in combination with a second restriction enzyme generating a 3' single stranded extremity which protects the primer initiation site SP6 or T7 in the plasmid vector from being degraded by the Exonuclease III, forces the enzyme to remove one strand of the inserted DNA fragment such as present in pMD07 or pMD12. Samples were taken from the reaction mixture at 30 seconds interval and treated according to the procedures described by Henikoff (1984), generating recircularized DNA molecules which are transformed into an appropriate E. coli host strain. Plasmid DNA minipreparations of individual colonies were analyzed by restriction mapping for the size of the deletion introduced into the original 1.2 and 3.5 kb fragments of pMD07 and pMD12 respectively. A series of candidates containing progressive deletions entering the fragment in one orientation, were analyzed by nucleotide sequencing using the double stranded DNA from mini-preparations in the chain termination reaction. Reaction products were separated on denaturing acrylamide gels and visualized on X-ray film by autoradiography. Banding patterns were read with a digitizer and data were assembled and analyzed using the shot-gun handler and other software from a Gene-Master workstation (Bio-Rad).
The XhoI restriction fragment adjacent the XhoI fragment present in pMD12 was subcloned from .lambda.HVT04 (FIG. 1) into pMD36 and partially sequenced according to the same procedure described above.
After the identification and detailed analysis of a region within the HVT genome were gene insertions are allowed to be made, a recombinant HVT virus can be constructed with any gene other than the one encoding .beta.-galactosidase. However, particularly those genes are of interest which encode relevant antigens from both related and nonrelated avian pathogens. An example of such an application will be described in the following paragraphs. The gene of interest encodes the 157 kd precursor molecule for the peplomer protein of Infectious Bronchitis Virus (IBV), a highly contagious coronavirus of chickens. This glycosylated protein is a major component of the typical surface structures, also known as spikes, present on all coronaviruses including IBV. A cDNA copy of this gene was isolated from IBV strain M41, a strain belonging to the Massachusetts serotype, and placed behind a promotor element derived from the long terminal repeat sequence (LTR) of Rous Sarcoma Virus (RSV). The gene including the promotor was then transferred to the unique BglII restriction site in pMD07, the same as used previously for the insertion of the .beta.-galactosidase expression cassette, and recombined into the viral genome of HVT. Recombinant progeny of the virus was screened for the expression of the spike gene and positive candidates were isolated and cloned by one or more platings at limiting dilution. Homogenous stocks of the recombinant IB/HVT virus were established and used for subsequent in vivo and in vitro characterization.
1. Isolation of the spike gene from IBV strain M41
Virus from IBV strain M41 was grown in 10 day old embryonated eggs, by inoculating the allantoic cavity with 10.sup.4 median egg infectious dose per egg. After 24 hours incubation at 37.degree. C., eggs were chilled overnight at 4.degree. C. Allantoic fluid was harvested taking care to keep it cool on ice. Red blood cells and debris were removed by centrifugation at 4.degree. C. and 6000.times. g for 30'. Virus was pelleted from the supernatant at 54,000.times. g in a Beckmann Type 19 rotor for 4 hours at 4.degree. C. The pellet was resuspended in cold TNE (10 mM Tris-HCl, 100 mM NAGl, 1 mM EDTA, pH 7.5) by repeated passage through a syringe needle and layered onto a 32 ml linear gradient of 20-60% sucrose in TNE. After overnight centrifugation at 4.degree. C. in a SW28 rotor at 24,000 rpm, virus band was collected through the side wall puncturing the tube with a syringe. After dilution with 2 volumes TNE, virus was pelleted in a SW28 rotor at 18,000 rpm for 90' at 4.degree. C. Material was resuspended in a small volume of TNE and sodium dodecylsulphate was added to a final concentration of 0.5%. Preparation was digested with proteinase K (Boehringer) at 200 .mu.g/ml for 2 hours at 37.degree. C. and extracted twice with a 1:1 mixture of phenol/chloroform. Viral RNA in the aqueous phase was precipitated with 2 volumes of ethanol in the presence of 0.1 M sodium acetate pH 6.0 at -20.degree. C. After centrifugation and rinsing the tube with ethanol, the pellet was dried under vacuum and dissolved in sterile water to give a RNA concentration of 0.5 mg/ml. Preparation contained >90% of IBV genomic RNA as checked by agarose gel electrophoresis and was stored at -20.degree. C. First strand cDNA synthesis was primed with oligo (dT).sub.12-18 in the presence of AMV reverse transcriptase using 5 .mu.g of viral RNA in a 75 .mu.l reaction volume. After incubating 30' at 44.degree. C., DNA/RNA hybrids were denatured by heating 3' at 100.degree. C. followed by synthesis of the second strand in the presence of the large fragment from E. coli DNA polymerase I incubating the reaction for 2 hours at 20.degree. C. cDNA was precipitated with ethanol and digested with 10 units of S.sub.1 nuclease in a 200 .mu.l reaction volume for 30' at 37.degree. C. Reaction products were layered onto 3.2 ml of a 5-20% sucrose gradient in 10 mM Tris-HCl, 5 mM EDTA, 500 mM NaCl, pH 7.5 and centrifuged in a SW65 rotor at 30,000 rpm for 16 hours at 15.degree. C. Material sedimenting with a size between 500 and 5000 base pairs was collected, ethanol precipitated and dissolved in 20 .mu.l of 0.1 SSC (15 mM NaCl, 1.5 mM sodium citrate). Ends of the double stranded cDNA were extended with 10 to 15 dG residues by a 2' incubation at 37.degree. C. with 15 units terminal transferase (Gibco-BRL) in a 30 .mu.l reaction volume according to the conditions recommended by the enzyme supplier. Reaction was stopped with 5 mM EDTA. Ten nanograms of tailed cDNA were heated for 2' at 65.degree. C. with a 25-molar excess of the phosphorylated synthetic oligomer 5'-dAATTCCCCCCCCCCC-3'(SEQ. ID NO:7) in a final volume of 10 .mu.l TEN and annealed together by overnight incubation at 50.degree. C. Ligation with 10 .mu.g of EcoRI digested .lambda.gt10 DNA (Huynh et al., 1985) was in 20 .mu.l of 30 mM Tris-HCl, pH 7.5, 10 mM MgCl.sub.2, 10 mM DTT, 0.1 mM ATP, adding 1 unit of T4 DNA ligase and incubating overnight at 4.degree. C. DNA was added to in vitro packaging reaction mixture (Promega) and a cDNA library from IBV strain M41 was established by selecting for recombinant phages after plating on an hflA strain of E. coli.
The library was screened for cDNA clones encoding fragments of the spike protein by plating one to two hundred pfu in a petri dish on a lawn of E. coli. Duplicate filters of nitrocellulose were prepared (Benton and Davis, 1978) and incubated overnight at 42.degree. C. with .sup.32 P-labelled synthetic oligomers in a hybridization solution containing 10 mM Tris-HCl, pH 7.5, 1 M NaCl, 0.1% SDS and 4.times. Denhardt's solution (Maniatis et al., 1982).
The three synthetic oligomers used as probes in these hybridizations contained the following nucleotide sequence structure:
I. 5'-dTTAGGTGGTCTGAAGGCACTTTGGTAGTAGTA-3'(SEQ. ID NO:8)
II. 5'-dTACCTACTAATTTACCACCAGAAACTACAAACTGCTG-3'(SEQ. ID NO:9)
III. 5'-dTGGATCATTAAACAGACTTTTTAGGTCTGTATTGTT-3'(SEQ. ID NO:10)
Recombinant phages giving a signal with one or preferentially two of these probes were selected and plaque purified by standard procedures (Maniatis et al., 1982). cDNA fragments from .lambda. phage recombinants were flanked by EcoRI restriction sites and transferred as such into the EcoRI site from plasmid cloning vector pGEM3Z (Promega). Restriction analysis and partial sequencing on two candidates showed that one encoded the complete S.sub.1 and the other encoded the S.sub.2 moiety of the spike gene. The sequence of these two DNA fragments partially overlapped with each other in particular with respect to the unique MluI-restriction site near the S.sub.1 /S.sub.2 junction. This site was then used to assemble the two fragments mentioned above and resulted in a plasmid construction with a 3.7 kb BamHI insert, carrying the complete gene encoding the precursor for the protein peplomer from IBV strain M41.
2. Construction of the HVT recombination plasmid pIB18 encoding the spike gene from M41 controlled by a LTR promotor.
A strong promotor which could direct the expression of foreign genes after their insertion into the genome of the HVT virus was selected from the LTR sequence of RSV. The promotor has been mapped on a 580 bp NdeI/HindIII restriction fragment from pRSVcat (Gorman et al., 1982) and was inserted between the HindIII and PstI sites of pGEM3Z (Promega) by means of double stranded synthetic linkers on both sides of the fragment. The connection between the HindIII site from the vector pGEM3Z and the NdeI site of the RSV fragment carrying the LTR promotor was made with a 30 bp linker containing cohesive ends compatible with HindIII on one and NdeI on the other site. However, after ligation both restriction sites are not restored due to deliberate modifications in the outer nucleotides of the six base pair recognition sequence. In addition to the removal of these two sites, a new restriction site (BamHI) present within the linker itself was created at the corresponding position. A second 20 bp linker was synthesized which connected the HindIII site from the LTR fragment to the PstI site from pGEM3 Z, in this case without destruction of the recognition sequence on either of the ends and adding the three convenient unique restriction sites BglII, XhoI and EcoRV, to those already present in the polylinker of pGEM3Z, e.g. PstI, SalI, XhoI and BamHI. The resulting derivative of pGEM3Z, designated pVEC01, therefore contains a 650 bp restriction fragment carrying the LTR promotor sequence immediately followed by seven restriction sites available for the insertion of foreign genes. The 650 bp fragment is flanked on either end by a BamHI restriction site and has been transferred as such to the unique BglII site present in the 1.2 kb HVT insert from pMD07. The cohesive ends generated by these two restriction enzymes are compatible but ligation does not restore either of the original recognition sequences for BglII or BamHI. One of the resulting constructs, carrying the LTR in the orientation towards the TR.sub.s, was designated pVEC04 and checked by restriction mapping (FIG. 4). The structure of this universal HVT recombination vector allows the insertion of foreign genes immediately downstream of the LTR promotor and subsequent integration of the complete expression cassette into the HVT genome by in vivo recombination. The positions of the different restriction sites downstream of the LTR in particular those for the enzymes BglII, XhoI and EcoRV are designed in such a way that even multiple gene insertion can be envisaged. A first application for this vector has been the construction of a recombinant HVT virus expressing the spike gene from IBV strain M41, the isolation of which has been described in the previous paragraph. A 3.7 kb BamHI restriction fragment carrying the spike gene from M41, was inserted into the unique BglII site of pVEC04 downstream of the LTR promotor. Again this manipulation does not restore either of the restriction sites after ligation. One of the candidates having the gene inserted in the correct orientation relative to the LTR promotor was analyzed by restriction mapping confirming the expected structure as presented in FIG. 5. This plasmid was designated pIB18 and used subsequently in the cotransfection of chicken embryo fibroblasts (CEF).
3. Genomic insertion of the spike gene from IBV into HVT and expression of the peplomer protein
Linearized DNA from pIB18 was transfected together with total DNA from HVT infected chicken cells according to the method described in example I for the construction of .beta.-galactosidase recombinants.
Detection of HVT recombinants expressing the spike protein was done by immunofluorescence staining using mono- or polyvalent sera against IBV. Primary cultures after the transfection were passed once on fresh CEF, harvested and sonicated as described before in example 1. After titration of the cell free lysates, microtitre plates with CEF were infected at limiting dilution using less then one pfu per well and incubated until CPE was detected. Cell suspensions from each of the wells separately were split over duplicate microtitre plates together with fresh CEF and reincubated for two days. One of the plates was then fixed, stained with IBV specific sera and inspected for immunofluorescence under the microscope scoring those wells which contained a majority of IBV-positive staining HVT plaques.
Viable infected cells were recovered from the corresponding wells of the duplicated microtitre plate and amplified by one or two passages on fresh CEF. This cloning procedure based on limiting dilution was repeated a number of times and resulted in several independent isolates of the recombinant HVT virus which all stained positively in the IBV specific immunofluorescence assay on infected cell cultures.
1. Isolation of genes encoding the fusion (F) and hemagglutinin (HN) protein from Newcastle Disease Virus (NDV)
Virus from the NDV vaccine strain Clone 30 (Intervet International, Holland) was grown on embryonated eggs for 30 hours and allantoic fluid harvested after overnight incubation at +4.degree. C. Virus was purified over a single sucrose gradient and genomic RNA was extracted by proteinase k digestion in the presence of SDS.
First strand cDNA synthesis was performed with reverse transcriptase using a random 10 base oligomer at 20 .mu.g/ml to prime the reaction.
Second strand synthesis, S1-treatment and following steps including insertion into the .lambda.gt10 vector were done as described previously under section 1 of example 4.
Screening of the library for F-gene specific sequences was done by plaque hybridization with the .sup.32 P-labelled oligonucleotides.
recognizing 5' and 3' extremities of the coding region, respectively. Identification of HN-gene sequences was done with the oligonucleotides.
The sequence of these probes was designed by comparing published data on NDV-strains Australia-Victoria (McGinnes et al., 1986), Italien (Espion, et al., 1987 and Wemers, et al., 1987), Beaudette (Chambers et al., 1986 and Millar et al., 1986) and D26 (Sato et al., 1987) .
Positive candidates giving a signal with at least two of the probes were isolated and characterized by restriction mapping. From this series, two were selected covering respectively the F and HN from NDV strain Clone 30.
The DNA inserts were transferred to the plasmid vector pGEM4Z and manipulated with the exonuclease Bal 31 to remove excessive or overlapping sequences up- or downstream of the actual coding region of the F- and HN-gene.
This resulted in the plasmids pNDV01 and pNDV03 containing the complete gene coding for F respectively HN flanked by Bam HI restriction sites.
2. Genomic insertion of F- and HN-gene from NDV into HVT.
Bam HI fragment of plasmid pNDV01 and pNDV03, containing the genes encoding F and HN respectively, were inserted into the Bg1 II site of the HVT recombination vector pVEC04 resulting in pNDV04 and pNDV05.
Correct orientation of inserted genes relative to the LTR promotor was verified by restriction analysis based on the physical map of these construct shown in FIG. 6.
DNA from these plasmids is co-transfected together with DNA from HVT infected cells into CEF as described in section 2 of example 1.
After amplification of transfected cultures, cel free lysates were established and plated onto microtiter dishes.
Detection of HVT recombinants expressing the F or HN protein was done by immunofluorescense staining using polyvalent NDV sera or monoclonal antibodies against specific NDV antigens.
Enrichment of HVT recombinant virus was done by limiting dilution as described section 3 of example 4. Establishment of a homogenous recombinant virus preparation was done by single plaque isolation and testing for expression of F respectively HN in infected CEF by immunofluorescence staining.
FIG. 1 Restriction enzyme map of a DNA fragment essentially corresponding to the Us region of the HVT genome. The relative position of the insertion region consisting of four open reading frames and non-coding sequences in between is indicated.
A) Restriction map of pMD07gal. This plasmid has been derived from pMD07 by inserting the .beta.-galactosidase gene into the unique BglII restriction site present in the 1.2 kb XhoI fragment of the HVT genome.
B) Restriction map of pMD12gal. This plasmid has been derived from pMD12 by inserting the .beta.-galactosidase gene into the unique BglII restriction site present in the 3.5 kb XhoI fragment of the HVT genome.
A) Restriction map of pMD40. A 1117 bp SpeI fragment present in pMD12 was replaced by a synthetic oligonucleotide containing a SalI site.
B) Restriction map of pMD44. Derived from pMD40 by insertion of a 4.0 ks .beta.-galactosidase marker gene flanked by SalI sites into the SalI site of pMD40.
FIG. 4 Restriction enzyme map of pVEC04 showing the LTR-promotor inserted into the unique BglII site of the 1.2 kb XhoI HVT fragment from pMD07.
FIG. 5 Restriction enzyme map of pIB18 showing the 3.7 kb BamHI fragment carrying the spike gene from IBV strain M41 inserted into the BglII site of pVEC04 downstream of the LTR promotor.
A) Restriction map of pNDV04. Plasmid contains NDV-F gene flanked by BamHI sites inserted into Bgl II site of pVEC04 (see FIG. 4).
B) Restriction map of pNDV05. Plasmid contains NDV-HN gene flanked by BamHI sites inserted into Bg1 II site of pVEC04 (see FIG. 4).
1. Benton, W.D. and Davis, R.W. (1978), Science, 196, 180.
2. Chambers et al. (1986), J. Gen. 67, 2685.
3. Espion et al. (1987), Arch. Virol. 95, 79.
4. Gorman, C. et al. (1982), Proc. Natl. Acad. Sci. USA, 79, 6777.
5. Graham, F. and v.d. Eb, A. (1973), Virology, 52, 456.
6. Henikoff, S. (1984), Gene, 28, 351.
7. Huynh, T.V., et al. (1985) in "DNA cloning, Vol I" ed D Glover, pag. 49
8. Igarashi, T., et al. (1987), Virology, 157, 351.
9. Maniatis, T., et al. (1982) in "Molecular cloning", Cold Spring Harbor laboratory.
10. McGinnes et al. (1986), Virus Res. 5, 343.
11. Millar et al. (1986), J. Gen. Virol. 67, 1917.
12. Sanger, I., et al. (1977), Proc. Natl. Acad. Sci. USA, 74, 5463.
13. Sato et al. (1987), Virus Res. Z, 241.
14. Wemers et al. (1987), Arch. Virol. 97, 101.
1. A vaccine comprising a recombinant herpesvirus of turkeys (HVT) comprising a heterologous nucleic acid sequence that encodes an antigen of an avian pathogen, said nucleic acid sequence being introduced in an insertion region of the HVT genome from the end of ORF-1 through ORF-5 located within a DNA fragment of the HVT genome having a restriction enzyme map defined in FIG. 1.
2. A vaccine comprising a recombinant herpesvirus of turkeys (HVT) that contains a heterologous nucleic acid sequence that encodes an antigen of an avian pathogen, said nucleic acid sequence being introduced in an insertion region of the HVT genome between nucleotide positions 82 and 4504 as defined in SEQ ID NO:1.
3. The vaccine of claim 1, wherein the insertion region is in ORF-2, ORF-3, ORF-4 or ORF-5.
4. The vaccine of claim 3, wherein the heterologous nucleic acid sequence is inserted at the BgLII restriction site present in ORF-2 or ORF-3.
5. The vaccine of claim 2, wherein at least part of the HVT nucleic acid sequence of the ORF within which the heterologous nucleic acid sequence is introduced is deleted.
6. The vaccine of claim 1, wherein the heterologous nucleic acid sequence is under control of a promoter regulating the expression of said nucleic acid sequence in a cell infected with said recombinant HVT.
7. The vaccine of claim 1, wherein the antigen is an antigen selected from the group of avian pathogens consisting of Marek's Disease Virus, Infectious Bronchitis Virus, Newcastle's Disease Virus and Infectious Bursal Disease Virus.
8. The vaccine of claim 2, wherein the antigen is an antigen selected from the group of avian pathogens consisting of Marek's Disease Virus, Infectious Bronchitis Virus, Newcastle's Disease Virus and Infectious Bursal Disease Virus.
Patent History
Type: Grant
Filed: Feb 16, 1993
Date of Patent: Nov 28, 1995
Assignee: Akzo Nobel N.V. (Arnhem)
Inventors: Paulus J. A. Sondermeijer (Boxmeer), Johannes A. J. Claessens (Boxmeer), Albert P. A. Mockett (Huntington Cames)
Primary Examiner: Stephen G. Walsh
Attorneys: Mary E. Gormley, William M. Blackstone
Application Number: 8/18,489
International Classification: A61K 31715; A61K 3170; A61K 39255; C12N 1545;


text:
April Bulletin Board Ideas
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Rosebank College holds charity lip sync battle and donates to 200 Bales | Photos
The local 200 Bales campaign received a boost from a somewhat unexpected place.
In late November Rosebank College (a co-ed Catholic high school at Five Dock in Sydney), raised $7,000 for the Mid-Western Region to help the drought affected area and community.
The school was able to collect this money from the students wearing mufti for a day and the students and staff entering into a lip sync battle.
The money raised has been donated to 200 Bales.
Which continues the musical support of the campaign along with the recent A Day in the Dirt concert, that saw nearly 1000 enthusiastic punters head to the Mudgee Showground for the fundraising event.


text: A front line, customer facing position which requires a high level of professionalism and diplomacy. Deals with all calls and visitors appropriately and efficiently and always in a courteous manner ensuring that they receive the best possible first impression of the Company. Responsible for carrying out a range of administrative and general assistance duties, so a flexible and helpful approach and the ability to prioritise is required.


text:
SLMC must play proactive role
Daily Mirror Editorial
Jan 18, 2011
The Sri Lanka Medical Council (SLMC) is like the supreme court for health services, the medical and paramedical professions. It has powers to enforce ethics and lay down guidelines for medical doctors and can even take action in cases where doctors are found to have violated ethics, acted irresponsibly or negligently. Unfortunately over the past few decades, the SLMC often played a reactive role and even then did not take effective action when there was substantial evidence of violation of ethics or irresponsible behaviour by those in the medical or paramedical professions.
The serious violations of ethics included conflicts of interest where the medical profession was offered not only five-star sponsorship but also multi-million-rupee scholarships or pleasure trips by another stakeholder. This may have been one of the reasons why medicine which was once regarded as a sacred vocation for doctors who took the Hippocratic Oath, gradually turned into a profession.
After the onset of the wholesale capitalist market economic system, the profession degenerated into a virtual business with pharmaceutical companies and pharmacies, private hospitals or clinics and medical specialists making millions at the expense of unsuspecting patients.
It is in such a grave or deadly scenario that the government has decided to intervene, take direct control of the SLMC and appoint the eminent physician Professor Carlo Fonseka as the President of this powerful medical supreme court.
The widely respected Prof. Carlo Fonseka has several decades of experience and as the Dean of the Kelaniya University's Medical Faculty he has taught and trained thousands of doctors.
Patients' rights and health action groups hope that Prof. Fonseka would lead the SLMC in playing a proactive role to restore a health service where the well-being of the patient is given top priority. Some medical associations have protested against the decision to make the SLMC a public enterprise. But patients' rights and health action groups point out that even in countries like the United States and Britain – master builders of the market economy – the health service is kept out of the market and monitored by the government with strict regulations. So must it be in Sri Lanka. Making the SLMC a state enterprise is an important step for the government to monitor and regulate the health service. Social analysts have pointed out that if health is left in the market the poor who can't afford healthcare will be left to die. Health rights groups also hope that the SLMC under Prof. Carlo Fonseka will play an effective role in advising and guiding the government on the implementation of a Charter of Patients' Rights and Responsibilities and a constitutional amendment to make health a fundamental right.
Health Minister Maithripala Sirisena told a news conference last Thursday that legislation for the setting up of a National Medicinal Drugs Regulatory Authority (NMDRA) had been approved by the Attorney General and would be presented to the Cabinet soon. The Minister said he was aware that while the biggest fraud in the world was in the arms industry, the second biggest fraud was in the pharmaceutical trade. Mr. Sirisena said that though he was under tremendous pressure he was determined to go ahead with the legislation to set up the NMDRA and implement the National Medicinal Drugs Policy (NMDP) within the next two or three weeks in line with the principles of the revered Professor Senaka Bibile. The effective implementation of this legislation and a more proactive role by the SLMC under Prof. Carlo Fonseka will make 2012 a people-friendly year in terms of healthcare.
Source: Daily Mirror - Sri Lanka


text:
|Postoperative cognitive dysfunction and aortic atheroma.
MedLine Citation:
|PMID: 20338312 Owner: NLM Status: MEDLINE
|BACKGROUND: The relationship of aortic atheroma to postoperative cognitive dysfunction (POCD), a common complication of coronary artery bypass graft surgery, has not been resolved. We undertook assessment of aortic atheroma using intraoperative ultrasonography and related the degree of aortic atheroma to POCD. METHODS: Aortic atheroma was assessed using intraoperative transesophageal and epiaortic echocardiography in 311 patients who underwent coronary artery bypass graft surgery. Atheroma was graded from 0 (normal or minimal) to 3 (mobile or rough) in each of four quadrants of the proximal ascending to proximal descending thoracic aorta. Atheroma burden was defined as the atheroma score divided by the total possible score for that patient. Patients also completed a neuropsychological battery consisting of eight tests taken the week before surgery and at 1 week and 3 and 12 months afterward. Decreased cognitive function for each test was defined as an individual decrease of at least 1 standard deviation of the group baseline mean for that test, and POCD was defined as a decrease in two or more tests. RESULTS: The atheroma burden (%) was greater in the patients with POCD. The difference was greatest at 1 week (10.4+/-14.7 versus 4.4+/-9.0, p=0.0002) and diminished progressively at 3 months (8.9+/-14.1 versus 5.4+/-10.1, p=0.06) and 12 months (6.6+/-12.0 versus 5.6+/-10.2, p=0.56). Multivariable analysis showed that atheroma burden strongly predicted POCD at 1 week. CONCLUSIONS: Aortic atheroma burden predicts POCD at 1 week but has less impact on POCD as time progresses. Atheroma burden is highly correlated with age and may be a good predictor of early POCD.
|Lisbeth A Evered; Brendan S Silbert; David A Scott
Publication Detail:
|Type: Journal Article
Journal Detail:
|Title: The Annals of thoracic surgery Volume: 89 ISSN: 1552-6259 ISO Abbreviation: Ann. Thorac. Surg. Publication Date: 2010 Apr
Date Detail:
|Created Date: 2010-03-26 Completed Date: 2010-04-26 Revised Date: -
Medline Journal Info:
|Nlm Unique ID: 15030100R Medline TA: Ann Thorac Surg Country: Netherlands
Other Details:
|Languages: eng Pagination: 1091-7 Citation Subset: AIM; IM
Copyright Information:
|Copyright (c) 2010 The Society of Thoracic Surgeons. Published by Elsevier Inc. All rights reserved.
|Centre for Anaesthesia and Cognitive Function, Department of Anaesthesia, St. Vincent's Hospital, University of Melbourne, Melbourne, Australia.
Export Citation:
|APA/MLA Format Download EndNote Download BibTex
|MeSH Terms
Aortic Diseases / complications*, epidemiology
Atherosclerosis / complications*, epidemiology
Cognition Disorders / epidemiology, etiology*
Coronary Artery Bypass*
Postoperative Complications / epidemiology, etiology*
Time Factors
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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text:
Dust Mites, Bacteria, and Mould are quite common to find in any of the houses. They lead to a number of different kinds of health issues and allergies. People try to do many different things to ensure that they remain safe from these bacteria. This will require an effective solution to ensure that they don't gather over the bed or other cozy material. It is mainly because these are the locations which are most prone to these bacteria.
Many different kinds of chemicals and elements are available which one can use against these bacteria. But they are not always effective to keep them away for a longer period of time. Sooner or later they will accumulate and will start causing health issue again. This will require a solution which can keep them away for a longer period of time in an effective manner.
Benefits of selecting Silk Doona
Silk Doona is mainly designed to ensure that we have reduced amount of exposure to different kinds of bacteria. The main reason is that dust mites can't live in the silk. This will help in providing the desired relief from asthma and also allergy. It is resulting as the maximum amount of night-time exposure to these bacteria is reduced by use of the Silk Doona.
It is mainly manufactured from 100% luxurious long strand silk filled bedding in a soft, 100% natural cotton cover. This composition is just suitable to ensure that bacteria stays away from your bed. Also, silk is resistant to these bacteria naturally. Even for the case of humans, silk turns out to be non-allergic in nature. IT will help in providing daily protection, easily washable, lightweight and many more.
This element is mainly intended for the use of people who are highly sensitive to dust mites or bacteria. Using this will provide them with a comfortable bed to have a sound sleep. Even they won't be facing any of the allergic issues for a prolonged sleep. Cloth prepared are made in a manner that it will never be forming a bunched look. The completely tailored look will help to improve the looks of your bed too.
Properties and Benefits of Silk Doona
Silk Doona is highly resistant to bacteria, mould, and dust mites. It will help us in keeping them away during the sound night sleep. Also, the material used for the bed is non-allergic to the different dye used to clean the cloth. It will help in keeping the cloth hygienic.
One can even easily wash the element without having additional effects. Also one should keep it away from the exposure to direct sunlight. This will help in preventing against the exposure of UV rays and also the heat which is damaging the silk. One can also have the manufacturer's warranty of 5 years with this element.
Thus, we can say that to remain away from the Dust Mites, Bacteria and Mould, Silk Doona is highly advantageous. It will help in ensuring that one can have an allergy free sound sleep during the night hours. One can also remain to rest assured about the likely effect of these bacteria as silk is naturally resistant to them.


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Terence W. Verified
7 months ago
Very good. The packing and transport were also very good. Have told others about you and your excellent service. The picture was a present for our daughter and she is delighted with it. . Thank you
Mr Ian T. Verified
absolutely fantastic portrait alongside the picture of Anne Boleyn also from King and mcGaw well worth the money lovely professional workmanship and also very fast secure delivery...ten out of ten


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Sugar Creek Treehouse
Where childhood dreams come true
Posted on January 11, 2018 by Jenna
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In the middle of the winter, take a break at the treehouse – your number one choice for a Winter Getaway in Janurary & Feburary 2018. Our winter specials offer a generous 15% discount to everyone. Enter the code winter15 when booking.
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Design Salad Decoration
Image of Design Salad Decoration
Design Salad Decoration picture is in category Home Design that can use for individual and noncommercial purpose because All trademarks referenced here in are the properties of their respective owners. In this post we give you some picture about design salad decoration, Design Salad Decoration. If you want to view image in full size just click image on gallery bellow.
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ASHEVILLE CITIZEN-TIMES / SEARCH: 4910 Carmel Park Drive Charlotte, NC 28226-5133
- 3 beds
- 2 baths
- $1,399,000 price
- 3408965 mls id
- Square Feet: 2,154 sqft
- Year Built: 1950
- Lot Size: 1.53 acres
- Status: Active
Located on 1.5 acres in the highly sought-after Carmel Park community! This spacious contemporary home has several possibilities from renovation to a new build. With an open format, the layout of the interiors is spacious and sun-lit: the possibilities are endless. Don't miss your chance to build on one of the last buildable lots available in Carmel Park.
- Site Link
- Property SubType Single Family Detached
Courtesy of: Peters & Associates
Office Phone: 7042644572
Listing Agent: Nicholas Peters
Updated: 24th April, 2019 10:24 PM.
4910 Carmel Park Drive Charlotte, NC
Real Estate | Asheville Citizen-Times Powered by Placester


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1317 Marsh Harbor N Dr is a $2,995, 3,123 square foot, 5 bedroom, 4.0 bath home located in Jacksonville, FL.
Easy living in Queen's Harbor. Open floor plan with breakfast nook, large family room with fireplace, formal dining room, large master suite, upstairs bedroom with its own bath, large laundry room with washer and dryer, patio with privacy. Queens Harbor offers lots of community amenities including pool, clubhouse, exercise room, basketball and tennis courts, and soccer fields. Small pet okay with increased security.
|Above Grade Sqft
Self Cleaning Oven
Range Electric
Ice Maker - Refrigerator
Water Heater - Electric Water Heater
|Interior Features
Eating Space - Kitchen
Walk-In Closet(s)
Split Bedrooms - Master Bedroom - First Floor
Split Bedrooms - Split Bedrooms
Separate Dining Room
Tile Floors
Kitchen - Breakfast Bar
Wall-to-Wall Carpet
Additional Rooms - Entry Hall/Foyer
Bath - Owner Bath Tub Separate Shower
|Fireplace Types
1 Fireplace
|Cooling Types
Central Cooling
|Heating Types
Central Heating
|Parking Types
2 Car
|Exterior Features
Common or Club Amenities - Club Pool
Tennis Court(s)
Lot Description or View - Regular Lot
Common or Club Amenities - Basketball Court(s)
No Pool - No Pool
Common or Club Amenities - Soccer Field(s)
Common or Club Amenities - Clubhouse
Common or Club Amenities - Golf Course
Restrictions - Pets - Limited
Restrictions - Pet Deposit (Refundable)
Road Frontage - City Street
Road Surface - Asphalt Road
Tenant Pays - All Utilities
Shingle Roof
|Construction Types
Exterior Wall - Stucco
|Water Source
Utilities - Water - Public
Utilities - Sewer - Public
|Property Type
Family-Less Than 1/2 Acre
|Year Built
|HOA Fee
Queens Harbour
The data relating to real estate for sale on this web site comes in part from the Internet Data Exchange (IDX) program of the Northeast Florida Multiple Listing Service, Inc. All Real Estate listings are marked with the listing broker's name and detailed information about such listings includes the name of the listing brokers. Data provided is deemed reliable but is not guaranteed. Copyright 2019 Northeast Florida Multiple Listing Service, Inc. All rights reserved. The property listing data and information are for the personal, non commercial use of consumers having a good faith interest in purchasing or leasing listed properties of the type displayed to them and may not be used for any purpose other than to identify prospective properties which such consumers may have a good faith interest in purchasing or leasing. Data updated every 15 minutes.


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In Loving Memory of
U.S. Navy Baker 2/C
Emery Lyle Houde
Brandt, South Dakota
Deuel County
August 29, 1914 -- December 7, 1941
Killed in Action at Pearl Harbor
Emery Lyle Houde was born in Sisseton, South Dakota, on
August 29, 1914. He was the son of Leo and Caroline Houde. Emery had two
brothers, Wallace and Paul, and one sister, Hattie. Emery lived and attended
school in many different towns. These include Sisseton, South Dakota; White
Rock, South Dakota; Webster, South Dakota; West La Fayette, Ohio; and Brandt,
South Dakota. After graduating from Brandt, South Dakota, he enlisted in the
Navy in 1936. While waiting to be called, he joined the Civilian Conservation
Corps. He married Selma Hale of Long Beach, California, in 1940.
Emery enlisted at Ottumwa, Iowa, and was trained at the
Naval Training Station in San Diego, California. He was sent overseas in 1936
and was stationed at Pearl Harbor. Houde was ranked as Baker second class. He
served on the U.S.S. Argonne, the U.S.S. Arizona, and the
U.S.S. Utah.
When the Japanese bombed Pearl Harbor on December 7, 1941,
Baker Second Class Emery Houde was on board the U.S.S. Utah when it sank.
Baker Houde was one of the many sailors entombed in the ship when it sank.
Emery Lyle Houde was awarded the Purple Heart for his
sacrifice for his country. He is listed on the Tablets of the Missing at
Honolulu Memorial, Honolulu, Hawaii.
Tyson Niles, Eleventh Grade, Waubay High School, Waubay,
South Dakota, February 22, 2002 respectfully submitted this entry. Paul Houde,
brother to Emery Houde, provided information for this entry. Nellie Houde also
assisted with information.


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Book Search
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Title: Ecclesiology and Theosis in the Gospel of John
Author: Byers, Andrew
Publisher: Cambridge University Press; Publication Date: 2017
Hardcover; ISBN: 9781107178601
Volumes: 1; Pages:
List Price in Hardcover: $99.99 Our price: $87.99
(Add to Cart button is at the bottom of this page)
For the author of the fourth Gospel, there is neither a Christless church nor a churchless Christ. Though John's Gospel has been widely understood as ambivalent toward the idea of 'church', Andrew Byers argues that ecclesiology is as central a Johannine concern as Christology. Rather than focusing on the community behind the text, John's Gospel directs attention to the vision of community prescribed within the text, which is presented as a 'narrative ecclesiology' by which the concept of 'church' gradually unfolds throughout the Gospel's sequence. The theme of oneness functions within this script and draws on the theological language of the Shema, a centerpiece of early Jewish theology and social identity. To be 'one' with this 'one God' and his 'one Shepherd' involves the believers' corporate participation within the divine family. Such participation requires an ontological transformation that warrants an ecclesial identity expressed by the bold assertion found in Jesus' citation of Psalm 82: 'you are gods'.
Table of Contents
1. The Johannine vision of community: trends, approaches, and 'narrative ecclesiology'
Part I. The Narrative Ecclesiology of the Prologue: No Churchless Christ, nor Christless Church:
2. The inclusive divine community: the Prologue's reinterpretation of God and God's people
3. The ecclesiology of filiation and the incarnation
4. Characterizing the Prologue's ecclesiology: the ambiguation and assimilation of John the Baptist
5. The Prologue's 'ecclesial narrative script': ecclesiology as story arc
Part II. The Narrative Ecclesiology of the Shema: A Reappraisal of the Johannine Oneness Motif:
6. The Shema as the foundation for John's theological use of 'one': identifying and addressing reservations
7. The Shema, John 17, and Jewish-Christian identity: oneness in narrative development
Part III. John's Narrative Ecclesiology of Participation and Deification:
8. The Fourth Gospel and deification in patristic writings
9. Johannine theosis: deification as ecclesiology
10. Characterizing Johannine theosis: divinized characters within the narrative
11. Narrative pneumatology and triadic theology: the Spirit-Paraclete as the character who divinizes beyond the narrative
12. John's narrative ecclesiology of deification: a synthesis
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A fire alongside Highway 20 Tuesday afternoon threatened homes on Redwood Valley"s Road A but was beaten back successfully and was nearing containment by 3:15 p.m. It was completely contained by nightfall.
Highway 20 was reduced to one-way traffic and reopened to two lanes just after 6 p.m.
Nearing 5 p.m. a helicopter began dropping water from Lake Mendocino on the fire.
Several fires on both sides of Highway 20 burned about 15 acres and threatened five homes, Cal Fire battalion chief Jim Wattenburger said.
"We were very successful to prevent any damage to those homes," Wattenburger said.
Called in to fight the fire were four air tankers, two helicopters and two bulldozers and five fire crews from Cal Fire. In addition to Redwood Valley-Calpella Fire, local fire departments from Brooktrails Fire Department near Willits to Hopland Fire and firefighters from Clear Lake Oaks arrived at the scene. The California Highway Patrol was on scene to help manage traffic.
The cause of the fire was not known as firefighters worked to gain containment of the blaze. "It originated at road side but its origin is unknown," Wattenburger said.


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Compose a draft thesis statement
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There are a growing number of specialised indices tracking the performance of companies in environmental technologies. Indices are used extensively by a range of investors such as researchers, fund managers, brokers and so forth for analysis, the measurement of performance, asset allocation, portfolio hedging and so forth. For individual investors they can be useful for researching specific sectors or companies in particular countries. More pertinently, indices are used for the creation of passively managed funds such as trackers and ETFs.
No credit card required


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Mother's Day Brunch at Gracias Madre
No meat, no problem. Serving Mexican-inspired vegetarian cuisine, Gracias Madre fits the modern chic mold of WeHo restaurants with an intimate outdoor patio and upscale Spanish design. Moms of LA can sip on a complimentary cocktail (the Karma Chamomilian) and brunch at this spot plush with olive trees, fresh organic produce, and decadent interiors (and two full service bars). The name translates to "Thank you, Mother," but at the end of this brunch, the madres will be the ones saying gracias. Check out the brunch menu online and reserve a table.
|Event phone:
|Event website:


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Can't get enough of the New York Knicks? Or do you just love orange and blue together? Adidas lovers this one is for you. The new Adidas Samba's are sporting a Knicks colorway with an upper made out of orange suede and blue leather on the three Adidas stripes/heel/tongue tag.
These sneaks should be hitting US shores soon, but if you cant wait, hit up Schuh-You for a pair! (The site is in german though, not for the faint of heart)
Source : Schuh-You