Relating two deep-rooted pedigrees from Central Germany by high-resolution Y-STR haplotyping.

Area of Science:

• Forensic genetics
• Anthropology
• Population genetics

Background:

• Y-STR haplotyping is crucial for identifying male lineages in forensic and anthropological studies.
• Investigating deep-rooted paternal genealogies requires robust genetic markers.

Purpose of the Study:

• To assess the paternal relatedness between two distinct, long-established German genealogies using high-resolution Y-STR haplotyping.
• To evaluate the efficacy of Y-STR analysis in tracing familial connections over several centuries.

Main Methods:

• Utilized high-resolution Y-STR haplotyping across 68 loci for two paternal pedigrees.
• Analyzed allele frequencies and compared Y-STR profiles between the pedigrees.
• Calculated a likelihood ratio incorporating mutation rates and local haplotype frequencies.

Main Results:

• 64 out of 68 Y-STR loci (94%) showed identical alleles between the two pedigrees.
• A consistent single-repeat difference was observed at four Y-STR loci.
• A likelihood ratio of 8.2:1 supported the hypothesis of paternal relatedness.

Conclusions:

• Y-STR haplotyping effectively identifies male lineages and links families to ancient common ancestors.
• The study underscores the need for expanded Y-STR haplotype databases to fully leverage this technology.
• Limitations in population frequency data highlight areas for future research in genetic genealogy.