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Association analysis of polymorphisms in six keratin genes with wool traits in sheep

文献类型： 外文期刊

作者： Sulayman, Ablat 1 ; Tursun, Mahira 1 ; Sulaiman, Yiming 1 ; Huang, Xixia 1 ; Tian, Kechuan 2 ; Tian, Yuezhen 1 ; Xu, X 1 ;

作者机构： 1.Xinjiang Agr Univ, Coll Anim Sci, Urumqi 830052, Peoples R China

2.Xinjiang Acad Anim Sci, Urumqi 830000, Peoples R China

3.Anim Husb & Vet Inst, Xinjiang 833400, Peoples R China

关键词： Chinese Merino (Xinjiang Type); Keratin; Wool Traits; Polymorphism; Combined Genotype

期刊名称：ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES （ 影响因子：2.509； 五年影响因子：2.604 ）

ISSN： 1011-2367

年卷期： 2018 年 31 卷 6 期

页码：

收录情况： SCI

摘要： Objective: The purpose of this study was to investigate the genetic effects of six keratin (KRT) genes on the wool traits of 418 Chinese Merino (Xinjiang type) (CMXT) individuals. Methods: To explore the effects and association of six KRT genes on sheep wool traits, The polymerase chain reaction-based single-strand conformation polymorphism (PCR-SSCP), DNA sequencing, and the gene pyramiding effect methods were used. Results: We report 20 mutation sites (single-nucleotide polymorphisms) within the six KRT genes, in which twelve induced silent mutations; five induced missense mutations and resulted in Ile -> Thr, Glu -> Asp, Gly -> Ala, Ala -> Ser, Se -> His; two were nonsense mutations and one was a same-sense mutation. Association analysis showed that two genotypes of the KRT31 gene were significantly associated with fiber diameter (p<0.05); three genotypes of the KRT36 gene were significantly associated with wool fineness score and fiber diameter (p<0.05), three genotypes of the KRT38 gene were significantly associated with the number of crimps (p<0.05); and three genotypes of the KRT85 gene were significantly associated with wool crimps score, body size, and fiber diameter (p<0.05). Analysis of the gene pyramiding effect between the different genotypes of the gene loci KRT36, KRT38, and KRT85, each genotype in a gene locus was combined with all the genotypes of another two gene loci and formed the different three loci combinations, indicated a total of 26 types of possible combined genotypes in the analyzed population. Compared with the other combined genotypes, the combinations CC-GG-II, CC-HH-IJ, CC-HH-JJ, DD-HH-JJ, CC-GH-IJ, and CC-GH-JJ at gene loci KRT36, KRT38, and KRT85, respectively, had a greater effect on wool traits (p<0.05). Conclusion: Our results indicate that the mutation loci of KRT31, KRT36, KRT38, and KRT85 genes, as well as the combinations at gene loci KRT36, KRT38, and KRT85 in CMXT have significant effects on wool traits, suggesting that these genes are important candidate genes for wool traits, which will contribute to sheep breeding and provide a molecular basis for improved wool quality in sheep.

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