A study analyzing 500 skeletal samples found that DNA quality is a more significant predictor of sequencing success than the skeletal source. Most samples that met the minimum DNA threshold yielded usable sequencing data, although common pre-sequencing metrics were only moderately predictive of profile completeness.
Background
The ability to extract and analyze DNA from unidentified human remains is crucial for forensic investigations. Understanding the factors that influence DNA sequencing success can enhance the effectiveness of forensic genetic genealogy. This study highlights the importance of DNA quality over the type of skeletal source in achieving high-completeness profiles.
Data Highlights
Bone Source
Failure-to-Progress Rate
Petrous Bone
6.5%
Metatarsal
12.5%
Tibia
12.5%
Femur
15.7%
Key Findings
399 out of 500 skeletal samples met the minimum DNA threshold for sequencing.
Single nucleotide polymorphism (SNP) call rates ranged from 8% to 91%, with 95.7% achieving call rates above 50%.
The strongest predictor of profile completeness was the ratio of total DNA to short-target human DNA.
Degradation index (DI) showed only a modest association with sequencing performance.
93.2% of sequenced samples achieved call rates of at least 60%, supporting uploads to the FamilyTreeDNA database.
Clinical Implications
Forensic practitioners should prioritize DNA quality metrics over skeletal source when assessing samples for SNP-based sequencing. This approach may improve the likelihood of obtaining usable genetic profiles from unidentified human remains.
Conclusion
The findings emphasize that while skeletal source is a consideration, DNA quality is the primary determinant of sequencing success in forensic applications.
