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A short tandem repeat-based phylogeny for the human Y chromosome
P Forster1, A Röhl, P Lünnemann
1Institut für Rechtsmedizin, University of Münster, Germany.
American Journal of Human Genetics
|May 29, 2000
Summary
This study introduces a novel phylogenetic-network method to reconstruct Y-chromosomal short tandem repeat (STR) evolution. The approach reveals the earliest human Y-STR lineages in African San populations, offering insights into human migration and mutation rates.
Area of Science:
- Population Genetics
- Human Evolutionary Studies
- Molecular Anthropology
Background:
- Human Y-chromosomal short tandem repeats (STRs) are valuable for understanding autosomal STR mutations.
- Reconstructing STR evolution has been limited by a lack of appropriate methodologies.
Purpose of the Study:
- To develop and validate a phylogenetic-network approach for reconstructing Y-STR evolution.
- To analyze Y-STR diversity across diverse indigenous populations.
Main Methods:
- Typing of 256 Y chromosomes from Africa, Asia, Europe, Australia, and Papua New Guinea for specific STR loci.
- Incorporation of five ancient biallelic mutation events for phylogenetic support.
- Application of reduced-median-network analysis and a two-class weighting system for Y-STR loci.
Main Results:
- A robust Y-STR phylogeny was generated, independently supported by biallelic mutations with a 6% error rate.
- The earliest branching Y-STR lineages were identified within the African San (Bushmen) sample.
- An estimated mutation rate for slowly mutating Y-STRs was determined to be 2.6x10^-4 mutations/20 years.
Conclusions:
- The developed phylogenetic-network approach is effective for reconstructing Y-STR evolution.
- The findings suggest deep Y-STR lineages in African populations, supporting models of human origins.
- Y-STR mutation rates are significantly slower than previously estimated average pedigree rates.