The Y-27H39 polymorphism in a Japanese population

Area of Science:

• Human genetics
• Population genetics
• Forensic genetics

Background:

• The Y chromosome is crucial for tracing paternal lineage.
• Microsatellite markers on the Y chromosome are valuable for population and forensic studies.
• The Y-27H39 locus contains a tetranucleotide TAGA repeat, a common type of genetic variation.

Purpose of the Study:

• To investigate the tetranucleotide TAGA repeat polymorphism at the Y-27H39 locus in Japanese males.
• To identify and characterize any novel alleles at this locus.
• To compare allele frequencies between Japanese and Caucasian populations.

Main Methods:

• Genotyping of 184 Japanese males for the Y-27H39 locus.
• Direct sequencing of identified Y-27H39 alleles.
• Analysis of allele frequencies in the studied population.

Main Results:

• Discovery of a new allele, designated F, at the Y-27H39 locus.
• The new allele F (206 nt) is characterized by an additional repeat unit compared to allele E (202 nt).
• Six distinct alleles were identified, differing solely in the number of TAGA repeats, with constant flanking sequences.
• Significant differences in allele frequencies were observed between Japanese and Caucasian populations.

Conclusions:

• The Y-27H39 locus exhibits a novel allele (F) in the Japanese population.
• Variations in repeat number at this locus contribute to genetic diversity.
• Allele frequency disparities highlight population-specific genetic profiles, relevant for ancestry and forensic applications.