Ovine TUSC5 and IGFBP3 Gene Polymorphisms and their Association with Tail Fat Weight in Sheep
文献类型： 外文期刊
作者： Cao, Peiliang 1 ; Zhang, Deyin 2 ; Xu, Dan 2 ; Ma, Zongwu 2 ; He, Lijuan 1 ; Pu, Mengru 2 ; Jia, Guoxing 1 ; Kong, Dewen 1 ; Li, Linting 1 ; Zhang, Jian 1 ; Li, Hongjian 1 ; Wu, Weiwei 3 ; Li, Fadi 2 ; Tian, Huibin 2 ; Wang, Weimin 2 ; Zhang, Xiaoxue 1 ;
作者机构： 1.Gansu Agr Univ, Coll Anim Sci & Technol, Lanzhou 730030, Gansu, Peoples R China
2.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou, Peoples R China
3.Xinjiang Acad Anim Sci, Urumqi, Peoples R China
关键词： IGFBP3; sheep; SNPs; TUSC5; tail fat weight
期刊名称：DNA AND CELL BIOLOGY （ 影响因子：2.6； 五年影响因子：2.4 ）
ISSN： 1044-5498
年卷期： 2025 年 44 卷 8 期
页码：
收录情况： SCI
摘要： Tail fat weight is a key economic trait in fat-tailed sheep; reducing tail fat deposition is of significant importance for improving the economic efficiency of sheep farming. In this article, we measured the live weight before slaughter, tail fat weight, and carcass weight of Hu male sheep at 6 months of age and performed the descriptive statistical analysis. The results indicated the coefficient of variation of tail fat-related-traits ranged from 25% to 50%. Simultaneously, we selected IGFBP3 and TUSC5 as candidate genes based on their close association with fat deposition. Target regions were amplified using gene-specific primers in PCR, followed by Sanger sequencing of PCR products to identify genetic variants. Polymorphisms were subsequently validated using the KASPar genotyping assay. Finally, quantitative reverse transcription PCR (qRT-PCR) was performed to determine the expression levels of IGFBP3 and TUSC5. Our findings revealed a missense mutation (g.83695349 C>T) in exon 1 of the IGFBP3 gene and a synonymous mutation (g.41771645 C>T) in exon 2 of the TUSC5 gene. Association analysis showed that these mutations were significantly correlated (p < 0.05) with tail fat weight traits. Moreover, the tail fat weight of the mutant genotypes (CT and TT) was significantly reduced compared with that of the CC genotype, suggesting that the gene may exert a negative regulatory effect on this trait, thereby leading to the reduction of tail fat weight. Furthermore, the genotype combinations showed a significant relationship with tail fat traits. Moreover, qRT-PCR results showed that TUSC5 and IGFBP3 genes were expressed in all experimental tissues of Hu sheep, and the highest expression was observed in tail fat compared with other tissues (heart, liver, spleen, lung, kidney, rumen, duodenum, muscle, and lymph). Notably, their expression levels were significantly lower in the large-tail fat group than in the small-tail fat group. Overall, these results will provide novel candidate variation for reducing tail fat deposition in sheep breeding practice.
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