title: Genetic mutations potentially cause two novel NCF1 splice variants up-regulated in the mammary gland, blood and neutrophil of cows infected by Escherichia coli.
abstract: Neutrophil cytosolic factor 1 (NCF1) plays a crucial role in host defense against microbial pathogens. In this study, we investigated the potential alternative splicing patterns, expression and splice-relevant single nucleotide polymorphisms (SNPs) of the bovine NCF1 gene to increase insights into its potential role against bovine mastitis caused by Escherichia coli infection. Using RT-PCR and clone sequencing methods, we found two novel splice variants designed as NCF1-TV1 (retained intron 6) and NCF1-TV2 (retained part of intron 8), respectively, encoding two putative truncated proteins (239AA and 283AA). Two splice variants were drastically up-regulated in the mastitis-infected cows' mammary tissues, blood and neutrophils compared with these of healthy cows using real-time RT-PCR. Genomic sequencing analysis identified four novel SNPs g.10112 G>A, g.10766 T>C, SNPs g.12085 G>A and g.12430 T>C at the ends of intron 6 and intron 8 of NCF1. ESE motif predicted that the SNP (g.10766 T>C) might affect the binding with splicing-related factors and subsequently caused the production of aberrant splice variant NCF1-TV1, which is one of the potential reasons that the functional SNP was associated with increased milk somatic cell score in cow. Our results would help in better understanding the NCF1 gene function in the process against pathogen infection, and the effect of splicing-related SNP on the production of aberrant splice variant and careful functional characterization in dairy cattle.
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
authors.forename: Zijing
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Xiuge
authors.initials: X
authors.lastname: Wang
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Rongling
authors.initials: R
authors.lastname: Li
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Ju
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Chao
authors.initials: C
authors.lastname: Qi
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: Guo
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China.
authors.forename: Guojing
authors.initials: G
authors.lastname: Luo
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Qiuling
authors.initials: Q
authors.lastname: Li
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Changfa
authors.initials: C
authors.lastname: Wang
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1).
authors.forename: Jifeng
authors.initials: J
authors.lastname: Zhong
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China. Electronic address: xuyinxue@njau.edu.cn.
authors.forename: Yinxue
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Dairy Cattle Research Center, Shandong Academy of Agricultural Sciences, No. 159 North of Industry Road, Jinan, Shandong 250131, People's Republic of China(1). Electronic address: huangjinm@sina.com.
authors.forename: Jinming
authors.initials: J
authors.lastname: Huang
authors.affiliation: College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, People's Republic of China. Electronic address: xuyinxue@njau.edu.cn.
authors.forename: Yinxue
authors.initials: Y
authors.lastname: Xu
mesh_terms: D000818:Animals; D001769:Blood / Q000276:immunology; D002417:Cattle; D003001:Cloning, Molecular; D004927:Escherichia coli Infections / Q000276:immunology / Q000662:veterinary*; D020869:Gene Expression Profiling; D006801:Humans; D042361:Mammary Glands, Human / Q000276:immunology; D008414:Mastitis, Bovine / Q000276:immunology* / Q000382:microbiology; D019255:NADPH Oxidases / Q000096:biosynthesis* / Q000235:genetics*; D009504:Neutrophils / Q000276:immunology; D020641:Polymorphism, Single Nucleotide; D012326:RNA Splicing; D060888:Real-Time Polymerase Chain Reaction; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015854:Up-Regulation
chemical_list: D019255:NADPH Oxidases; C060505:neutrophil cytosolic factor 1
keywords: Aberrant splicing; Cattle; Functional SNP; Mastitis; NCF1 gene