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Nucleotide sequence and genomic organization of bird minisatellites.

Two minisatellite loci from a Eurasian songbird, the willow warbler (Phylloscopus trochilus) were isolated, sequenced and used as probes to detect more than 20 related hypervariable loci. In addition, a sequence flanking one of the minisatellite loci was isolated, and used to study a VNTR locus. The bird minisatellites have a repeat unit of either 12 (AGGGAAGGGCTC) or 17 bp (GGGGACAGGGGACACCC), repeated in tandem 40-100 times per locus, and shows partial similarity to the sequence motifs of human minisatellites. These sequences are among the most variable minisatellites known, with the incidence per gamete of new length alleles estimated from family studies of warblers to about 5.6% per locus. The bird minisatellite alleles show mendelian inheritance and segregation analysis indicates that they are derived from families of sequences with members on several autosomal linkage groups. Some of the warbler core sequences cross-hybridize to hypervariable loci in other species of birds, mammals and fishes.