An economical mtDNA SNP assay detecting different mitochondrial haplogroups in identical HVR 1 samples of Caucasian ancestry.
BACKGROUND
We had sequenced 329 Caucasian samples in Hypervariable Region 1 (HVR 1) and found that they belong to eleven different mitochondrial DNA (mtDNA) haplotypes. The sample set was further analysed by an mtDNA assay examining 32 single nucleotide polymorphisms (SNPs) for haplogroup discrimination. In a validation study on 160 samples of different origin it was shown that these SNPs were able to discriminate between the evolved superhaplogroups worldwide (L, M and N) and between the nine most common Caucasian haplogroups (H, I, J, K, T, U, V, W and X).


RESULTS
The 32 mtDNA SNPs comprised 42 different SNP haplotypes instead of only eleven haplotypes after HVR 1 sequencing. The assay provided stable results in a range of 5ng genomic DNA down to virtually no genomic DNA per reaction. It was possible to detect samples of African, Asian and Eurasian ancestry, respectively.


CONCLUSIONS
The 32 mtDNA SNP assay is a helpful adjunct to further distinguish between identical HVR 1 sequences of Caucasian origin. Our results suggest that haplogroup prediction using HVR 1 sequencing provides instable results. The use of coding region SNPs for haplogroup assignment is more suited than using HVR 1 haplotypes.
Köhnemann
Stephan
S
Institute of Legal Medicine, Münster University, D-48149 Münster, Germany. Stephan.Koehnemann@ukmuenster.de
Hohoff
Carsten
C
Pfeiffer
Heidi
H
D016172:DNA Fingerprinting / Q000191:economics / Q000379:methods*; D004272:DNA, Mitochondrial / Q000145:classification* / Q000235:genetics*; D018732:Forensic Anthropology / Q000379:methods; D005554:Forensic Medicine / Q000379:methods; D005828:Genetics, Population; D005838:Genotype; D006239:Haplotypes; D006801:Humans; D020641:Polymorphism, Single Nucleotide; D044465:White People
D004272:DNA, Mitochondrial