Probabilistic expert systems for forensic inference from DNA markers in horses: applications to confirm genealogies with lack of genetic data.

The research paper discusses the utilization of probabilistic expert systems (PESs) to confirm the genealogies of horses using microsatellites as DNA markers, even when genetic data from one or both parents is missing. The authors argue PESs offer a feasible solution for complex parentage disputes, providing reliable results.

Microsatellites in Genetic Testing

• The authors establish that microsatellites, highly polymorphic sequences dispersed across almost all eukaryotic nuclear genomes, are instrumental in parentage testing and individual identification in forensic science.
• The use of microsatellites is common in DNA-based genetic testing for domestic animals, such as horses. This technology assists in confirming identities, establishing parentage, and verifying registration certificates.

Limitations of Traditional Genetic Testing

• The paper raises a challenge faced in genealogical verification when the genetic data of a supposed parent is unavailable or missing. In such cases, the traditional approach to genetic testing is inept.

Probabilistic Expert Systems (PESs)

• The primary goal of this study was to introduce a new method to scrutinize complex disputed relationship cases using microsatellite markers. This involved analyzing the genotypes of offspring and other horses mentioned in the pedigrees of potential dams/sires.
• A probabilistic expert system (PES) proved effective in delivering reliable Bayesian probabilities without errors, specifically for complex cases with missing pedigree data.

FINEX Program

• One of the PESs used and detailed in the study is the FINEX program. This system was initially developed for forensic purposes and has proven useful in human analyses.
• The researchers adapted the FINEX program for parentage analysis in horses. The paper further illustrates how a series of cases have been successfully resolved using this tool.