title: Effects of the polymorphisms of Mx1, BAT2 and CXCL12 genes on immunological traits in pigs.
abstract: It is necessary that genetic markers or biomarkers can be used to predict resistance towards a wide range of infectious diseases. In the present study, we estimated the potential markers and measured their relationship with heritabilities of a wide range of immune traits. Polymorphisms in exon 13 of Mx1, intron 25 of BAT2 and intron 3 of CXCL12 were identified by sequencing, and the genotypes were analyzed by PCR-RFLP in a resource population composed of 352 pure breed Landrace piglets at days 0, 17 and 32 after birth. Associations of single-nucleotide polymorphisms (SNPs) in these genes with a variety of immunological traits and antibody levels for pig reproduction and porcine respiratory syndrome virus (PRRSV), pseudorabies virus (PRV) and classical swine fever virus (CSFV) were performed. The performance of GG genotype of BAT2 on hemoglobin concentration (HBG) and hematocrit (HCT) of piglets at day 0 was significantly higher than that of the AA and AG individuals. For Mx1, compared with CT genotype, the pigs with TT or CC generated more PRRS antibody at day 0. The piglets with CT genotype had highly significant difference of PRV antibody from those with CC and TT genotypes at day 0. And the piglets with CC genotype had higher level red blood cell count (RBC), hemoglobin concentration (HBG) and hematocrit (HCT) than those with CT and TT genotypes at day 17. For the C7462G SNP in the intron 3 of CXCL12, the PRV antibody level of piglets with the CG genotype were higher than that of piglets with CC and GG genotypes at day 17, and the mean corpuscular volume (MCV) of GG piglets were larger than that of CC and CG individuals at day 0. At the locus 7331 bp in the intron 3 of CXCL12, there were significantly differences of mean corpuscular hemoglobin concentrations (MCHC) at day 0 and white blood cell count (WBC) at day 32, which showed the trend GG or AG>AA, AA>AG or GG, respectively. The pigs with AA or GG genotype had more platelet distribution width (PDW), mean platelet volume (MPV) and platelet-large cell ratio (PLR) at day 17 than those with AG. The results of this study indicated that polymorphisms in Mx1, BAT2 and CXCL12 genes were significantly associated with the immunological traits in Landrace piglets and had potential application value for marker-assisted selection of pig breeding with disease resistance.
authors.affiliation: Key Laboratory of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Huazhong Agriculture University, Wuhan, Hubei 430070, China.
authors.forename: S J
authors.initials: SJ
authors.lastname: Wang
authors.forename: W J
authors.initials: WJ
authors.lastname: Liu
authors.forename: C A
authors.initials: CA
authors.lastname: Sargent
authors.forename: S H
authors.initials: SH
authors.lastname: Zhao
authors.forename: H B
authors.initials: HB
authors.lastname: Liu
authors.forename: X D
authors.initials: XD
authors.lastname: Liu
authors.forename: C
authors.initials: C
authors.lastname: Wang
authors.forename: G H
authors.initials: GH
authors.lastname: Hua
authors.forename: L G
authors.initials: LG
authors.lastname: Yang
authors.forename: N A
authors.initials: NA
authors.lastname: Affara
authors.forename: S J
authors.initials: SJ
authors.lastname: Zhang
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D000914:Antibodies, Viral / Q000097:blood; D001483:Base Sequence; D001792:Blood Platelets / Q000166:cytology; D001947:Breeding / Q000379:methods; D054377:Chemokine CXCL12 / Q000235:genetics*; D017931:DNA Primers / Q000235:genetics; D060467:Disease Resistance / Q000235:genetics* / Q000276:immunology; D019204:GTP-Binding Proteins / Q000235:genetics*; D056726:Genetic Association Studies / Q000662:veterinary; D005819:Genetic Markers / Q000235:genetics*; D005838:Genotype; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D008969:Molecular Sequence Data; D064547:Myxovirus Resistance Proteins; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic / Q000235:genetics*; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D017422:Sequence Analysis, DNA / Q000662:veterinary; D034421:Sus scrofa / Q000235:genetics* / Q000276:immunology
chemical_list: D000914:Antibodies, Viral; D054377:Chemokine CXCL12; D017931:DNA Primers; D005819:Genetic Markers; D006454:Hemoglobins; D064547:Myxovirus Resistance Proteins; D019204:GTP-Binding Proteins