[Polymorphisms of mitochondrial DNA hypervariable regions HVR I and HVR II in Changdu Tibetan in China].
OBJECTIVE
To analyze the sequence polymorphisms of mitochondrial DNA HVR I and HVR II in Tibetan population in Changdu area of Tibet.


METHODS
mtDNAs obtained from 97 unrelated individuals were amplified and directly sequenced.


RESULTS
One hundred and eleven variable sites were identified, including nucleotide transitions, transversions, insertions and deletions. In HVR I region (nt16024-nt16365), sixty-eight polymorphic sites and 92 haplotypes were observed, and the genetic diversity was 0.9985. In HVR II region (nt73-nt340), forty-three polymorphic sites and 91 haplotypes were detected, and the genetic diversity was 0.9882. The random match probability of HVR I and HVR II regions were 0.0120 and 0.0118, respectively. When the sequence analysis of HVR I and HVR II regions were combined, ninety-seven different haplotypes were found. The combined match probability of two unrelated persons having the same sequence was 0.0103.


CONCLUSIONS
There are some unique polymorphic loci in the Changdu Tibetan population. The results suggest that there are significant difference in the genetic structure in the mitochondrial DNA D-loop region between Changdu Tibetans and other Asian populations and Caucasians. Sequence polymorphism in mitochondrial DNA HVR I and HVR II can be used as a genetic marker for forensic individual identification and genetic analysis.
Tibet University Medical School, Lhasa, Tibet 850000, P.R. China.
Jianmin
J
Zhao
Longli
L
Kang
Liqiang
L
Bian
Zong
Z
La
D044466:Asian People / Q000235:genetics*; D001483:Base Sequence; D004272:DNA, Mitochondrial / Q000235:genetics*; D005006:Ethnicity / Q000235:genetics*; D005260:Female; D014644:Genetic Variation; D023281:Genomics; D006239:Haplotypes; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D011110:Polymorphism, Genetic; D017422:Sequence Analysis, DNA; D018609:Tibet
D004272:DNA, Mitochondrial