China Animal Husbandry and Veterinary Medicine ›› 2025, Vol. 52 ›› Issue (3): 1166-1179.doi: 10.16431/j.cnki.1671-7236.2025.03.019

• Genetics and Breeding • Previous Articles    

Analysis of Genetic Structure and Maternal Origin of Seven Kazakh Cattle Populations in Xinjiang Based on D-loop Polymorphism

WANG Panpan1, SHARAMATI·Bodai2, BAKHET·Bodai1, LI Zhenwei1, ORALHAZI·Hazikhan1   

  1. 1. College of Animal Science and Technology, Shihezi University, Shihezi 832000, China;
    2. Emin County Technical School in Tacheng Prefecture of Xinjiang, Emin 834600, China
  • Revised:2024-10-10 Published:2025-02-22

Abstract: 【Objective】 Mitochondrial DNA (mtNDA) D-loop sequence polymorphism was used as a marker to explore the genetic structure and maternal origin of 7 Kazakh cattle populations in Xinjiang,so as to provide basic data for the rational utilization and biodiversity protection of Xinjiang cattle breeds.【Method】 DNA was extracted from the blood of 179 Kazakh cattle,and the mtDNA D-loop sequence was determined,SnapGene software was used to compare and correct the sequencing sequence with the reference sequence to determine the length and position of the mtDNA D-loop region sequence,and the base content was counted.DnaSP 5.10 software was used to statistically analyze and calculate the parameters of single nucleotide polymorphism (SNP),number of haplotypes (H),nucleotide diversity (Pi) and haplotype diversity (Hd),respectively.The genetic structure of Kazakh cattle population was analyzed by Arlequin 3.0 software.The genetic distance of Kazakh cattle population in mtDNA D-loop region was calculated by Mega 11.0 software,and the Neighbor-Joining (NJ) phylogenetic tree was constructed.【Result】 The complete sequence of mtDNA D-loop region in Kazakh cattle population was 909-911 bp,the average contents of A,G,T and C were 32.8%,13.8%,28.8% and 24.6%,respectively.The content of AT was higher than that of GC.A total of 131 SNPs were detected in 179 individuals,of which the variation sites accounted for 14.40% of the total length of the measured nucleotides,and 89 haplotypes were defined,Hd and Pi were 0.974 and 0.01288,respectively,indicating that the genetic diversity of Kazakh cattle population was very rich.The results of molecular variation analysis showed that 97.13% of the variation was within the population,2.87% was from the variation between populations,and the genetic distance ranged from 0.0109 to 0.0186,the genetic differentiation index (Fst) ranged from ―0.0053 to 0.0782,and there was no significant differentiation (P>0.05).Phylogenetic tree analysis showed that 7 Kazakh cattle populations in Xinjiang had two maternal origins:Common cattle and zebu cattle.【Conclusion】 Kazakh cattle in Xinjiang were derived from two maternal lines and had rich genetic diversity.Although there was genetic differentiation between populations,while there was no obvious geographical isolation,and the differences in genetic structure were narrowing.The results provided a theoretical reference for conservation and utilization of Kazakh cattle genetic resources.

Key words: Kazakh cattle; mtDNA D-loop; genetic diversity; systematic evolution

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