Mutation ofTWNKGene Is One of the Reasons of Runting and Stunting Syndrome Characterized by mtDNA Depletion in Sex-Linked Dwarf Chicken
文献类型： 外文期刊
作者： Hu, Bowen 1 ; Yang, Minmin 1 ; Liao, Zhiying 1 ; Wei, Haohui 1 ; Zhao, Changbin 1 ; Li, Dajian 1 ; Hu, Shuang 1 ; Jiang, 1 ;
作者机构： 1.South China Agr Univ, Coll Anim Sci, Dept Anim Genet Breeding & Reprod, Guangzhou, Peoples R China
2.Minist Agr, Guangdong Prov Key Lab AgroAnim Genom & Mol Breed, Guangzhou, Peoples R China
3.Minist Agr, Key Lab Chicken Genet Breeding & Reprod, Guangzhou, Peoples R China
4.Guangdong WenShi Grp Co Ltd, Guangzhou, Guangdong, Peoples R China
5.Univ Maryland, Virginia Maryland Reg Coll Vet Med, Div Immunol, College Pk, MD 20742 USA
关键词： runting and stunting syndrome; mitochondrial DNA depletion; TWNK; sex-linked dwarf chicken; liver
期刊名称：FRONTIERS IN CELL AND DEVELOPMENTAL BIOLOGY （ 影响因子：6.684； 五年影响因子：7.219 ）
ISSN： 2296-634X
年卷期： 2020 年 8 卷
页码：
收录情况： SCI
摘要： Runting and stunting syndrome (RSS), which is characterized by low body weight, generally occurs early in life and leads to considerable economic losses in the commercial broiler industry. Our previous study has suggested that RSS is associated with mitochondria dysfunction in sex-linked dwarf (SLD) chickens. However, the molecular mechanism of RSS remains unknown. Based on the molecular diagnostics of mitochondrial diseases, we identified a recessive mutation c. 409G > A (p. Ala137Thr) of Twinkle mitochondrial DNA helicase (TWNK) gene and mitochondrial DNA (mtDNA) depletion in RSS chickens' livers from strain N301. Bioinformatics investigations supported the pathogenicity of theTWNKmutation that is located on the extended peptide linker of Twinkle primase domain and might further lead to mtDNA depletion in chicken. Furthermore, overexpression of wild-typeTWNKincreases mtDNA copy number, whereas overexpression ofTWNKA137T causes mtDNA depletionin vitro. Additionally, theTWNKc. 409G > A mutation showed significant associations with body weight, daily gain, pectoralis weight, crureus weight, and abdominal fat weight. Taken together, we corroborated that the recessiveTWNKc. 409G > A (p. Ala137Thr) mutation is associated with RSS characterized by mtDNA depletion in SLD chicken.
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