Forensic genetic analysis of mitochondrial DNA hypervariable region I/II sequences: an expanded Korean population...

Area of Science:

• Forensic Genetics
• Population Genetics
• Mitochondrial DNA Analysis

Background:

• Mitochondrial DNA (mtDNA) hypervariable regions are crucial for population genetic studies and forensic identification.
• Existing Korean mtDNA databases require expansion and validation for improved reliability.

Purpose of the Study:

• To establish an expanded and reliable Korean mtDNA database by analyzing hypervariable segments I and II (HVS-I and HVS-II).
• To enhance the quality of existing databases through error detection and elimination using haplogroup comparisons.
• To provide haplotype information for forensic and population genetic analyses in the Korean population.

Main Methods:

• Analysis of mitochondrial DNA (mtDNA) hypervariable segments I and II (HVS-I and HVS-II) in 185 Korean individuals.
• Combined sequence comparison of HVS-I and HVS-II to identify haplotypes and variable sites.
• Database expansion and quality improvement through haplogroup-based comparisons and comparison with related sequences.

Main Results:

• 167 different haplotypes were identified from 154 variable sites, with 151 being individual-specific.
• Average pairwise differences between individuals were 10.11 +/- 4.63.
• Random match probability was 0.66% and gene diversity was 0.9988.
• No significant population differentiation was found between the current data and SWGDAM database, but differences were noted with other datasets.
• Korean mtDNA profiles largely fall into East Asian haplogroup subsets, indicating lineages from both southern and northern complexes.

Conclusions:

• The expanded Korean mtDNA database improves data quality and reliability for forensic and population genetic applications.
• Comparison with closely related mtDNA sequences is effective for enhancing database quality.
• Koreans exhibit a mix of southern and northern East Asian mtDNA haplogroup lineages.