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The Y Chromosome Determines Maleness02:19

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The Y chromosome is a sex chromosome found in several vertebrates and mammals, including humans. In addition to 22 pairs of autosomes, the human males have one X chromosome and one Y chromosome. In these organisms, the presence or absence of the Y chromosome determines the development of male traits.
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The new Y Chromosome Haplotype Reference Database.

Sascha Willuweit1, Lutz Roewer1

  • 1Department of Forensic Genetics, Institute of Legal Medicine and Forensic Sciences, Charité - Universitätsmedizin, Berlin, Germany.

Forensic Science International. Genetics
|December 23, 2014
PubMed
Summary

The Y Chromosome Haplotype Reference Database (YHRD) 4.0 is a major update, expanding its global Y chromosome profiles. This enhanced database supports advanced forensic analysis and population genetics research worldwide.

Keywords:
DatabaseFrequency estimationHaplotypeMetapopulationY chromosomeY-STR

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Area of Science:

  • Forensic genetics
  • Population genetics
  • Bioinformatics

Background:

  • The Y Chromosome Haplotype Reference Database (YHRD) has been a key resource for over 14 years.
  • Previous versions have undergone significant relaunches to improve functionality and data scope.

Purpose of the Study:

  • To announce the release of the new YHRD 4.0 repository and website.
  • To highlight the expanded dataset and enhanced interpretation tools available for genetic analysis.

Main Methods:

  • Data compilation from over 250 international institutes and laboratories.
  • Inclusion of 9-locus, 17-locus, and 23-locus Y-chromosome haplotypes, alongside Y-SNP profiles.
  • Geographic data distribution analysis across 128 countries.

Main Results:

  • YHRD 4.0 contains approximately 136,000 9-locus haplotypes, 84,000 17-locus haplotypes, 25,000 23-locus haplotypes, and 15,000 Y-SNP profiles.
  • Samples are geographically distributed with 39% from Europe, 32% from Asia, and significant contributions from South America, North America, Africa, and Oceania.
  • The database supports enhanced interpretation tools including variable frequency estimators and likelihood ratio-based analyses.

Conclusions:

  • The continuous growth of YHRD, driven by global collaboration, enhances its utility for forensic casework and population studies.
  • YHRD 4.0 provides a robust platform for advanced genetic interpretation, including ancestry assessment using Y-SNPs.