A novel DNA profiling method for individual sample matching and its applications to wildlife diagnostics

Area of Science:

• Conservation genetics
• Forensic science
• Wildlife forensics

Background:

• DNA analysis is crucial for wildlife diagnostics and combating illegal trade.
• Current DNA profiling requires extensive population data, limiting its application to few species.
• Lack of reference data hinders individual identification in many wildlife and plant taxa.

Purpose of the Study:

• To introduce a novel DNA analysis approach for individual identification that bypasses the need for population reference data.
• To develop a flexible method applicable to any species and genetic marker set for wildlife forensics.
• To enable accurate DNA profile interpretation on a case-by-case basis.

Main Methods:

• Developed heterozygote analysis for reference-free probability assessment (HARP).
• HARP utilizes ultra-conservative match probability estimates based on heterozygote genotypes.
• Assumes a 0.5 allele frequency for both alleles, eliminating reliance on population databases.

Main Results:

• HARP successfully enables individual identification without population reference data.
• The method is adaptable to diverse species and genetic markers.
• Demonstrated HARP's efficacy through three distinct case studies across various species and diagnostic contexts.

Conclusions:

• HARP offers a significant advancement in wildlife forensics, overcoming limitations of traditional DNA profiling.
• The reference-free approach democratizes DNA-based identification for a wider range of species, particularly in illegal trade investigations.
• This method provides a robust and adaptable tool for novel individual identification scenarios in conservation and law enforcement.