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Association Analysis of Polymorphism of KRTCAP3 Gene with Wool Production and Growth Performance in Fine Wool Sheep (Ovis aries) |
WANG Li1, HU Rui-Xue2, LI Fa-Di1, YUE Xiang-Peng1,* |
1 State Key Laboratory of Grassland Agro-ecosystems/Key Laboratory of Grassland Livestock Industry Innovation/Ministry of Agriculture and Rural Affairs/Engineering Research Center of Grassland Industry, Ministry of Education/College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China; 2 College of Animal Science and Technology, Huazhong Agricultural University, Wuhan 430070, China |
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Abstract The keratinocyte-associated protein 3 gene (KRTCAP3) affects the growth of skin, nails and hair by regulating keratin. In order to uncover the genetic variation in the KRTCAP3 gene and its genetic roles in wool production and growth performance in nangan (South African Mutton Merino (♂)×Gansu alpinefine-wool (♀)) and nannangan (South African Mutton Merino (♂)×nangan (♀)) crossbred sheep breed. DNA pool sequencing was used to scan the potential SNPs within the full-length DNA of KRTCAP3 gene in AF×MF population. The correlation between SNP locus and hair growth and growth traits of hybrid sheep was also analyzed. Six hundred crossbred sheep were individually genotyped by SNPscanTM method. Then, the association analysis between SNP locus and wool production and growth performance was implemented. The results showed that one SNP (g.34287851C>G) was identified in intron2. Three genotypes, CC, CG and GG, in this locus were found in AF×MF crossbreed sheep population. The genotypic frequencies of CC, CG and GG were 0.35, 0.52 and 0.13, respectively. The allelic frequencies of C and G were 0.61 and 0.39, respectively. The population genetic parameters analyses showed that the homozygosity (Ho), heterozygosity (He) and effective allele number (Ne) were 0.53, 0.47 and 1.90, respectively. The polymorphism information contents (PIC) was 0.36 and suggested that this SNP was moderate diversity (0.25<PIC<0.5). The χ2 test indicated that this locus was not in Hardy-Weinberg equilibrium (P<0.05). The association analysis of polymorphisms in KRTCAP3 gene with wool traits revealed that g.34287851C>G was significantly associated with the wool length of shoulder and side , wool length of thigh and notum, crimpness and crimp recovery (P<0.05 or P<0.01). The association analysis of polymorphisms in KRTCAP3 gene with growth performance revealed that g.34287851C>G was significantly associated with tube circumference and chest girth (P<0.05 or P<0.01). In summary, the g.34287851C>G site in KRTCAP3 gene could be used as a useful molecular marker for selection wool traits and growth performance. This study provides a molecular basis for utilization of fine wool resources and accelerates the breeding progress.
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Received: 17 July 2019
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Corresponding Authors:
*lexp@lzu.edu.cn
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