Genetic Diversity of mtDNA Genome in Ganzi Tibetan Cattle
[Objective]This study aims to explore the mitochondrial DNA(mtDNA)genomic diversity and maternal origins of Ganzi Tibetan cattle.[Methods]We employed whole mtDNA genome sequencing and bioinfor-matics techniques for analysis.[Results]In the mtDNA genomes of 28 Ganzi Tibetan cattle,1232 variable sites were detected,identifying 22 haplotypes.The haplotype diversity(Hd)was 0.98820±0.00010,and the nucleo-tide diversity(Pi)was 0.02420±0.00003,indicating a rich maternal genetic diversity among Ganzi Tibetan cat-tle.Phylogenetic trees and network diagrams show that the mtDNA genomes of the 28 Ganzi Tibetan cattle include four maternal lineages:T2,T3,and T4 lineages of domestic cattle and a yak lineage.The proportions of the T2,T3,T4,and yak lineages are 7.14％,64.29％,3.57％,and 25％,respectively.[Conclusion]Ganzi Tibetan cattle possess considerable maternal genetic diversity,originating from domestic cattle maternal lineages,but also show hybridization with yaks.
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