A mini-STR typing system for degraded equine DNA.

Area of Science:

• Forensic Science
• Genetics
• Animal Science

Background:

• Degraded biological samples pose significant challenges for genetic testing laboratories.
• Traditional genotyping methods often fail with compromised DNA.
• Short tandem repeats (STRs) are crucial for genetic profiling, but longer amplicons reduce success rates with poor-quality samples.

Purpose of the Study:

• To develop an improved genetic profiling system for equine parentage testing.
• To enhance genotyping success rates with degraded biological samples.
• To create a system utilizing mini-STRs for reduced amplicon sizes.

Main Methods:

• Development of a genetic profiling system using 13 autosomal and one X-linked dinucleotide-repeat markers.
• Inclusion of the SRY gene for comprehensive genetic analysis.
• Division of markers into two panels with all alleles at or below 182 base pairs (bp).
• Utilized primers placed adjacent to repeat motifs to minimize amplicon size.

Main Results:

• The developed system significantly increases the ability to profile difficult, degraded samples.
• The method provides highly discriminating results for equine parentage verification.
• All alleles across the two panels were successfully amplified and analyzed within the target size range.

Conclusions:

• The mini-STR based genetic profiling system offers a robust solution for genotyping challenging equine samples.
• This approach enhances the reliability and efficiency of equine parentage testing.
• The system's design facilitates successful genetic analysis even with limited or degraded DNA.