The highly polymorphic nature and high amplification efficiency of mitochondrial DNA (mtDNA) is valuable for the analysis of biological evidence in forensic casework, such as the identification of individuals and assignment of race/ethnicity. To be useful, a mtDNA polymorphism database for the Japanese population requires an understanding of the range of haplotype variation and phylogenies of mtDNA sequences. To extend current knowledge on the haplotypes in the Japanese population, this study defines new lineages and provides more detail about some of those previously described. We compared the hypervariable regions (HVRs) of 270 healthy, unrelated Japanese individuals and demonstrated 192 haplotypes. Combining HVR1 and HVR2, the genetic diversity was 0.9935, thus providing a high level of identification capability. Haplogroup status was defined for 160 individuals using HVR1, HVR2, and particular coding region polymorphisms; these individuals belonged to 94 haplotypes, four of which were new lineages. The complete mtDNA sequence was also determined from seven individuals.
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