Article (Scientific journals)
Allelic variation in TLR4 is linked to resistance to Salmonella Enteritidis infection in chickens.
Li, Peng; Wang, Huihua; Zhao, Xingwang et al.
2017In Poultry Science
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Keywords :
Salmonella Enteritidis; chicken TLR4; homology modeling; polymorphism and genotypes
Abstract :
[en] Salmonella Enteritidis (SE) is a foodborne 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-pathogen-free (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.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Li, Peng ;  Université de Liège - ULiège > Doct. sc. agro. & ingé. biol. (Paysage)
Wang, Huihua
Zhao, Xingwang
Gou, Zhongyong
Liu, Ranran
Song, Yongmei
Li, Qinghe
Zheng, Maiqing
Cui, Huanxian
Everaert, Nadia ;  Université de Liège > Agronomie, Bio-ingénierie et Chimie (AgroBioChem) > Ingénierie des productions animales et nutrition
Zhao, Guiping
Wen, Jie
Language :
English
Title :
Allelic variation in TLR4 is linked to resistance to Salmonella Enteritidis infection in chickens.
Publication date :
2017
Journal title :
Poultry Science
ISSN :
0032-5791
eISSN :
1525-3171
Publisher :
Poultry Science Association, United States - Illinois
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
(c) 2017 Poultry Science Association Inc.
Available on ORBi :
since 05 July 2017

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