Short tandem repeat loci: application to forensic and human remains identification

Area of Science:

• Forensic Science
• Human Identification
• Population Genetics

Background:

• Short tandem repeat (STR) loci are crucial genetic markers for human identification.
• The ACTBP2 (SE33) locus's utility in forensic science required detailed characterization.
• Establishing allele frequency distributions is essential for population-specific forensic databases.

Purpose of the Study:

• To evaluate the short tandem repeat (STR) locus ACTBP2 (SE33) for forensic applications.
• To determine optimal PCR amplification conditions and develop an allele-specific ladder for SE33.
• To analyze SE33 allele frequency distributions in Caucasian and Black populations for human identification.

Main Methods:

• Optimized Polymerase Chain Reaction (PCR) amplification for the SE33 locus.
• Generated an allele-specific ladder for accurate scoring of discrete SE33 alleles.
• Determined SE33 allele frequency distributions in Caucasian and Black populations.

Main Results:

• Established reliable PCR amplification conditions and an allele-specific ladder for SE33.
• SE33 allele frequency data met Hardy-Weinberg expectations in both populations.
• Observed similar allele distributions across racial and ethnic groups, indicating broad applicability.

Conclusions:

• The SE33 locus is a valuable tool for forensic human identification.
• Its consistent allele distributions across populations enhance its reliability in diverse contexts.
• SE33 analysis successfully aided in the identification of human remains for the Office of the Armed Forces Medical Examiners.