title: Analysis of chicken TLR4, CD28, MIF, MD-2, and LITAF genes in a Salmonella enteritidis resource population.
abstract: Salmonella enteritidis is a foodborne pathogen that negatively affects both animal and human health. Genetic variations in response to pathogenic SE colonization or to SE vaccination were measured in a chicken resource population. Outbred broiler sires and 3 diverse, highly inbred dam lines produced 508 F1 progeny that were evaluated for either bacterial colonization after pathogenic SE inoculation or circulating antibody level after SE vaccination. Five candidate genes were selected for study, based on their biological function as possibly affecting response to SE: toll-like receptor 4 (TLR4), T-cell specific surface protein (CD28), macrophage migration inhibitory factor (MIF), MD-2, and lipopolysaccharide-induced tumor necrosis factor (TNF)-alpha factor (LITAF). Gene fragments were sequenced from the founder lines of the resource population. The LITAF and MIF genes were homozygous for all sires. Single nucleotide polymorphisms (SNP) were identified in 3 genes (TLR4, CD28, and MD-2) and were used to test for associations of sire SNP with SE response. Linear mixed models were used for statistical analyses. The CD28 broiler sire SNP was associated with both bacterial load in the cecum (P < 0.003) and vaccine antibody response (P < 0.05). The MD-2 SNP was associated (P < 0.04) with the bacterial load in the spleen. The use of these SNP in these genes in marker-assisted selection may result in enhancement of disease resistance.
authors.affiliation: Department of Animal Science, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: M
authors.initials: M
authors.lastname: Malek
authors.forename: J R
authors.initials: JR
authors.lastname: Hasenstein
authors.forename: S J
authors.initials: SJ
authors.lastname: Lamont
mesh_terms: D000818:Animals; D002645:Chickens / Q000235:genetics* / Q000382:microbiology*; D005260:Female; D006580:Genetic Carrier Screening; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics*; D009687:Nuclear Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D011201:Poultry Diseases / Q000235:genetics / Q000276:immunology; D011956:Receptors, Cell Surface / Q000235:genetics*; D011971:Receptors, Immunologic / Q000235:genetics*; D012481:Salmonella Infections, Animal / Q000235:genetics / Q000276:immunology; D012477:Salmonella enteritidis / Q000302:isolation & purification*; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D014157:Transcription Factors / Q000235:genetics*
chemical_list: C118738:LITAF protein, human; D008562:Membrane Glycoproteins; D009687:Nuclear Proteins; D011956:Receptors, Cell Surface; D011971:Receptors, Immunologic; D051197:Toll-Like Receptor 4; D051193:Toll-Like Receptors; D014157:Transcription Factors; C033184:macrophage migration inhibitory factor receptor