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Mutation rates at two human Y-chromosomal microsatellite loci using small pool PCR techniques
U Holtkemper1, B Rolf, C Hohoff
1Institut für Rechtsmedizin, Von-Esmarch Strasse 62, Universität Münster, D-48149 Münster, Germany.
Human Molecular Genetics
|March 7, 2001
Summary
This study quantifies Y-chromosomal short tandem repeat (Y-STR) mutation rates using sperm DNA. Findings reveal mutation rates of approximately 0.4% per gamete, supporting the stepwise mutation model for male evolutionary studies.
Area of Science:
- Genetics
- Population Genetics
- Forensic Science
Background:
- Y-chromosomal short tandem repeats (Y-STRs) are crucial for phylogenetic, evolutionary, and forensic studies.
- Accurate mutation rates are essential but previously relied on simulations or limited data.
- Existing data often derived from autosomal STRs, necessitating Y-STR specific analysis.
Purpose of the Study:
- To accurately determine mutation types and rates for specific Y-STR loci.
- To establish reliable mutation rate values for DYS19 and DYS390.
- To support the stepwise mutation model and inform male evolutionary history research.
Main Methods:
- Analysis of approximately 18,000 DNA sequences from sperm cells of three donors.
- Utilized small pool PCR with automated laser-induced fluorescence detection.
- Examined two Y-STR loci: DYS19 and DYS390.
Main Results:
- Determined single repeat gain mutation rates: 0.18% for DYS390 and 0.21% for DYS19.
- Observed two-repeat changes at approximately 0.01%.
- Predicted an overall mutation rate of ~0.4% per gamete per generation for these Y tetranucleotide loci.
Conclusions:
- The findings support the stepwise mutation mechanism driven by replication slippage.
- The established mutation rates are valuable for individual mutation risk assessment.
- This approach provides insights into male evolutionary history and population genetics.