STR loci Penta D and Penta E: data from a Northern Thai population sample

Area of Science:

• Forensic Genetics
• Population Genetics
• Molecular Anthropology

Background:

• Short tandem repeat (STR) loci are crucial for human identification.
• Penta D and Penta E are pentanucleotide repeat loci used in forensic genetics.
• Optimized primer design can improve the efficiency of STR analysis.

Purpose of the Study:

• To design and validate new primers for Penta D and Penta E loci.
• To assess the genetic diversity and discriminatory power of these loci in a Northern Thai population.
• To evaluate the suitability of these markers for forensic applications.

Main Methods:

• Development of novel primers for Penta D and Penta E loci, yielding shorter amplicons.
• Genotyping of 112 unrelated Northern Thai individuals using native polyacrylamide gel electrophoresis.
• Statistical analysis of allele frequencies, Hardy-Weinberg equilibrium, and power of discrimination.

Main Results:

• Nine alleles for Penta D and eighteen alleles for Penta E were identified.
• High powers of discrimination were observed: Penta D (0.927), Penta E (0.966), and combined (0.9975).
• Penta D loci met Hardy-Weinberg expectations; Penta E deviated, potentially due to sample size and allele number.

Conclusions:

• The newly designed primers facilitate efficient separation and analysis of Penta D and Penta E STRs.
• These loci exhibit significant discriminatory power in the Northern Thai population, suitable for forensic identification.
• Further studies with larger sample sizes are recommended to investigate the deviation from Hardy-Weinberg equilibrium for Penta E.