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[Keratin 17 gene mutation in patients with steatocystoma multiplex].

OBJECTIVE
To study the relationship between steatocystoma multiplex (SCM) and keratin 17 gene mutation.


METHODS
The keratin 17 gene mutation in the cDNA of cystic tissue of 5 patients of SCM and in the DNA in peripheral blood of 25 patients with SCM from a SCM family was studied by direct sequencing of the RT-PCR products, nested PCR, and restricted fraction length polymorphism (RFLP) analysis. Thirty-nine blood specimens from the unaffected members of that family were collected and tested too. Ten DNA pool specimens and other 2000 DNA pool specimens of normal individuals outside that SCM family were used as controls.


RESULTS
In the base 428, 94(th) codon in keratin 17 gene in the cDNA of patients' cystic tissue, R94C mutation, a G-->A mutation, was detected Nested PCR, and restricted enzyme Acil polymorphism analysis showed that in the DNA specimens of peripheral blood of patients a mutated allele lacking enzyme cutting locus was detected, thus causing an uncut band with 200 bp while the corresponding allele was cut and caused two bands with 108 bp and 92 bp. In the DNA pool specimens of normal controls only these two bands with 108 bp and 92 bp were observed.


CONCLUSION
The R94C mutation in keratin 17 gene is one of the genetic bases of SCM in Chinese. The results of this study provide scientific data for genetic diagnosis and counseling of SCM.