Allelic variation in TLR4 is linked to resistance to Salmonella Enteritidis infection in chickens
文献类型： 外文期刊
作者： Li, Peng 2 ; Wang, Huihua 3 ; Zhao, Xingwang 1 ; Gou, Zhongyong 4 ; Liu, Ranran 1 ; Song, Yongmei 1 ; Li, Qinghe 1 ; Zhen 1 ;
作者机构： 1.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100193, Peoples R China
2.Univ Liege, Gembloux Agrobiotech Livestock & Nutr Unit, Passage Deportes 2, B-5030 Gembloux, Belgium
3.Chinese Acad Agr Sci, Inst Apicultural Res, Beijing 100093, Peoples R China
4.Guangdong Acad Agr Sci, Inst Anim Sci, Guangzhou 510640, Guangdong, Peoples R China
关键词： chicken TLR4;polymorphism and genotypes;Salmonella Enteritidis;homology modeling
期刊名称：POULTRY SCIENCE （ 影响因子：3.352； 五年影响因子：3.679 ）
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收录情况： SCI
摘要： Salmonella Enteritidis (SE) is a food-borne pathogen that negatively affects both animal and human health. Polymorphisms of the TLR4 gene may affect recognition by Toll-like receptor 4 (TLR4) of bacterial lipopolysaccharide (LPS), leading to differences in host resistance to pathogenic infections. The present study has investigated polymorphic loci of chicken TLR4 (ChTLR4) in ten chicken breeds, electrostatic potentials of mutant structures of TLR4, and a linkage analysis between allelic variation and survival ratio to infection with SE in specific-pathogenfree (SPF) White Leghorns. A total of 19 Single Nucleotide Polymorphisms (SNPs), of which 10 were novel, were found in chicken breeds. Seven newly identified amino acid variants (C68G, G674A, G782A, A896T, T959G, T986A, and A1104C) and previously reported important mutations (G247A, G1028A, C1147T, and A1832G) were demonstrated in the extracellular domain of the ChTLR4 gene. Significant changes in surface electrostatic potential of the ectodomain of TLR4, built by homology modeling, were observed at the Glu83Lys (G247A), Arg298Ser (A896T), Ser368Arg (A1104C), and Gln611Arg (A1832G) substitutions. Linkage analysis showed that one polymorphic locus G247A of TLR4 gene, common in all breeds examined, was significantly associated with increased resistance to SE in SPF White Leghorns chicks (log-rank P-value = 0.04). The genotypes from A1832G SNPs did not show statistically significant survival differences. This study has provided the first direct evidence that G247A substitution in ChTLR4 is associated with increased resistance to Salmonella Enteritidis.
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