ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (3): 449-456.doi: 10.11843/j.issn.0366-6964.2016.03.005

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Association Analyses between Mitochondrial Coding Gene Variations and Sheep Litter Size

CHEN Xiao-yong1,2,SUN Hong-xin2,YUAN Ming3,KANG Zhen-jiang3,DUN Wei-tao2* ,ZHAO Xing-bo1*   

  1. (1.College of Animal Science and Technology,China Agricultural University,Beijing 100193,China;2.Institute of Animal Science and Veterinary of Hebei Province,Baoding 071000,China;3.Workstation of Animal Science Breeds of Hebei Province,Shijiazhuang 050000,China)
  • Received:2015-03-12 Online:2016-03-23 Published:2016-03-23

Abstract:

The aim of the present study was to explore the effects of mtDNA on litter size in sheep.Genome sequencing and genotyping technologies were used for DNA variation analyses on mitochondrial coding genes in Dorper,Dorset and Suffolk sheep.In Dorper sheep,twenty-five mtDNA variations were detected,including 2 mutations in rRNA and tRNA genes,respectively,and 21 variations in polypeptide-coding genes(including 9 missense mutations and 12 synonymous mutations).For Dorset sheep,totally 20 variations,including 5 mutations in rRNA genes,1 mutation in tRNA genes,and 14 substitutions in polypeptide-coding genes(including 3 missense mutations and 11 synonymous mutations) were detected.In Suffolk sheep,there were 77 mutations in mtDNA coding genes,including 7 and 3 substitutions in rRNA and tRNA genes,and 67 mutations in polypeptide-coding genes which contained 7 missense mutations and 60 synonymous mutations.The mtDNA mutations presented poor associations with litter size in Dorper and Dorset sheep.However,in Suffolk sheep,14 mtDNA mutations were significantly associated with litter size(P<0.05),which both of the maximal values for the effects of the single mutation(T7759C) and haplotype(ATTCATTAAACTTT) were 0.22 per parity.The mtDNA had poor effects on litter size in Dorper and Dorset sheep.Mitochondrial DNA variations were significantly associated with litter size in Suffolk sheep.

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