[Studying the polymorphism at DYF155S1 locus in Chinese Han population by MVR-PCR marked with fluorescence]

The simple and useful genotyping methods of DYF155S1 locus by silver staining and fluorescence detection have been established. The blood samples from 155 unrelated males in Chinese Han population were typed by these two methods respectively and the same results were obtained. Among the 155 samples 66 alleles were found, out of them 38 were observed once only. The most frequent alleles named 18 or 22, which frequency was 0.065, the size of their first DNA fragments was 180 bp and the number of fragments was 16 or 17. The gene diversity (h) was 0.9789. Out of the 155 samples, 25 samples had one or two bands lost (null repeat) among the successive bands. It was demonstrated by sequencing that the position of the lost bands corresponded to type 3 repeats. Our results indicated that the method, which revealed the 5' end diversity of DYF155S1 locus, was a technique that could obtain the most Y-specific polymorphic information only by one PCR reaction. The allele frequencies of DYF155S1 locus in Chinese Han population provided the basic data for the study of population genetics and forensic practices.