Praew Suppajariyawat. The analysis of allele frequencies and haplotype profiling of five Y chromosome STR loci in Thai male population and forensic application . Master's Degree(Forensic Science). Mahidol University. : Mahidol University, 2004.
The analysis of allele frequencies and haplotype profiling of five Y chromosome STR loci in Thai male population and forensic application
การศึกษาวิเคราะห์ความถี่ของอัลลีลและ Haplotype profiling ของ Y chromosome STR 5 ตำแหน่งในประชากรชายไทยและการประยุกต์ใช้ในงานนิติเวชศาสตร์
Abstract:
Five human short tandem repeat polymorphisms (STRs) also known as
microsatellites-DYS389I/II,DYS390,DYS392,DYS393, and DYS439, mapping in the
Y chromosome, can be typed using PCR amplification and separation of the resulting
polymorphic fragments by denaturing high resolution polyacrylamide gel
electrophoresis and silver staining. Conversely DYS392, DNA fragments were
separated effectively by using non-denaturing polyacrylamide gel electrophoresis. The
PCR primers amplify a repeat sequence on the Y chromosome revealing a band
pattern in male individuals. Exceptionally DYS389, amplified a partially duplicated
region and generated two PCR fragments both of which varied in length and were
referred to as DYS389I and DYS389II.
In this study 5 Y-STR loci (DYS389I/II,DYS390,DYS392,DYS393, and
DYS439) were typed in a sample of 100 unrelated Thai males. The repeat structure of
alleles, found on each locus, consisted of one trinucleotide repeat (DYS392) and four
tetranucleotide repeats (DYS389I/II, DYS390, DYS393 and DYS439). The allele
frequency distribution of all five loci showed a unimodal distribution. Except for
DYS392 which clearly showed a bimodal allele frequency distribution. The number of
alleles found at each locus ranged from 3 to 8. Gene diversity values ranged from
0.5574 to 0.7989. The highest average gene diversity was found in DYS389II and the
lowest in DYS393. The haplotype combining five of the loci presented 92 different
haplotypes and haplotype diversity was calculated to be 0.9982.
The allele frequencies and haplotype analysis at 5 Y-STR loci would be useful
for personal identification in forensic science and for population genetics due to the
high divergence of these haplotypes