Complex mutational events at the HumD21S11 locus

Area of Science:

• Human genetics
• Population genetics
• Molecular anthropology

Background:

• The HumD21S11 locus is a short tandem repeat (STR) system with known allelic variations.
• Understanding STR locus structure is crucial for population genetic studies and forensic applications.

Purpose of the Study:

• To investigate length and sequence variability at the HumD21S11 locus across five distinct human populations.
• To elucidate the structural nuances of this STR system and its implications for population genetics.

Main Methods:

• Analysis of DNA samples from five human populations.
• Sequencing and characterization of the HumD21S11 locus.
• Application of population genetic models (infinite allele model, stepwise mutation model) and Hardy-Weinberg equilibrium analysis.

Main Results:

• Two main allele types (Type I consensus and Type II interalleles with TA insertion) were identified across all populations.
• Ovambo and Papuan populations exhibited substantial sequence variability in multiple regions of the HumD21S11 locus.
• Ovambo and Papuan populations showed a better fit to the infinite allele model, unlike German, Japanese, and Chinese populations which showed no model bias.
• No significant deviations from Hardy-Weinberg equilibrium were observed in any of the studied populations.

Conclusions:

• The HumD21S11 locus displays significant population-specific sequence variability, particularly in Ovambo and Papuan groups.
• Extreme variations in certain populations influence the applicability of population genetic models.
• The HumD21S11 locus remains in Hardy-Weinberg equilibrium across the studied populations, indicating stability.