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Tetranucleotide STR system D8S1132: sequencing data and population genetic comparisons
P Wiegand1, H R Schneider, M Schürenkamp
1Institut für Rechtsmedizin, Martin-Luther-Universität Halle-Wittenberg, Halle/Saale, Germany.
International Journal of Legal Medicine
|July 1, 1998
Summary
Researchers sequenced the D8S1132 locus, identifying 9 alleles with a specific repeat pattern. A new nomenclature was proposed, and allele distribution was analyzed in German populations, showing high heterozygosity and discrimination power.
Area of Science:
- Forensic Genetics
- Population Genetics
- Molecular Biology
Background:
- The D8S1132 locus is a short tandem repeat (STR) marker used in forensic genetics.
- Understanding allele variation and distribution is crucial for accurate human identification.
- Previous characterization of the D8S1132 locus sequence and its population genetics was limited.
Purpose of the Study:
- To sequence selected alleles of the D8S1132 locus to elucidate its molecular structure.
- To propose a standardized nomenclature for D8S1132 alleles.
- To investigate the allele frequencies and population genetics of the D8S1132 locus in German populations.
Main Methods:
- Sequencing of 31 selected D8S1132 alleles.
- Analysis of repeat array structure and flanking regions.
- Population data analysis in three German population samples (Halle, Münster, Wiesbaden).
Main Results:
- Identified 9 distinguishable alleles ranging from 134 to 170 bp, with regular 4 bp increments.
- The repeat array follows the pattern (TCTA)n TCA (TCTA)n, with one-third of alleles showing a TCTG TCTA variant.
- High heterozygosity (0.83) and discrimination power (0.96) were observed in the Halle population; Hardy-Weinberg equilibrium was maintained.
Conclusions:
- A novel nomenclature for D8S1132 alleles is proposed based on sequence data and ISFH recommendations.
- The D8S1132 locus exhibits significant genetic variation and is a valuable tool for forensic identification.
- The allele distribution is consistent across the studied German populations, supporting its utility in forensic casework.