Dataset Information

Genome-wide association study of Mycobacterium avium subspecies Paratuberculosis infection in Chinese Holstein.

ABSTRACT: BACKGROUND:Paratuberculosis is a contagious, chronic and enteric disease in ruminants, which is caused by Mycobacterium avium subspecies paratuberculosis (MAP) infection, resulting in enormous economic losses worldwide. There is currently no effective cure for MAP infection or a vaccine, it is thus important to explore the genetic variants that contribute to host susceptibility to infection by MAP, which may provide a better understanding of the mechanisms of paratuberculosis and benefit animal genetic improvement. Herein we performed a genome-wide association study (GWAS) to identify genomic regions and candidate genes associated with susceptibility to MAP infection in dairy cattle. RESULTS:Using Illumina Bovine 50?K (54,609 SNPs) and GeneSeek HD (138,893 SNPs) chips, two analytical approaches were performed, GRAMMAR-GC and ROADTRIPS in 937 Chinese Holstein cows, among which individuals genotyped by the 50?K chip were imputed to HD SNPs with Beagle software. Consequently, 15 and 11 significant SNPs (P?

SUBMITTER: Gao Y

PROVIDER: S-EPMC6307165 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Genome-wide association study of Mycobacterium avium subspecies Paratuberculosis infection in Chinese Holstein.

Gao Yahui Y Jiang Jianping J Yang Shaohua S Cao Jie J Han Bo B Wang Yachun Y Zhang Yi Y Yu Ying Y Zhang Shengli S Zhang Qin Q Fang Lingzhao L Cantrell Bonnie B Sun Dongxiao D

BMC genomics 20181227 1

<h4>Background</h4>Paratuberculosis is a contagious, chronic and enteric disease in ruminants, which is caused by Mycobacterium avium subspecies paratuberculosis (MAP) infection, resulting in enormous economic losses worldwide. There is currently no effective cure for MAP infection or a vaccine, it is thus important to explore the genetic variants that contribute to host susceptibility to infection by MAP, which may provide a better understanding of the mechanisms of paratuberculosis and benefit ...[more]

PMID: 30591025

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Project description:BACKGROUND: MAP is a suspected zoonotic pathogen and the causative agent of Johne's Disease in cattle and other ruminant animals. With over $1 billion dollars in loss to the dairy industry due to Johne's Disease, efforts to eliminate or reduce MAP from cattle are of importance. The purpose of this study was to determine if daily intake of probiotics could eliminate or reduce Johne's Disease associated symptoms and pathogenesis by MAP. Post infection, animals are often asymptomatic carriers with limited shedding of the pathogen, proving early detection to be difficult. Disease and symptoms often appear 3-4 years after infection with antibiotic treatment proving ineffective. Symptoms include chronic gastrointestinal inflammation leading to severe weight-loss from poor feed and water intake cause a wasting disease. These symptoms are similar to those found in individuals with Crohn's Disease (CD); MAP has been implicated by not proven to be the causative agent of CD. Probiotics administered to livestock animals, including dairy and beef cattle have demonstrated improvements in cattle performance and health. Our objectives included determining the benefits of Lactobacillus animalis (strain name: NP-51) in MAP infected BALB/c mice by evaluating systemic and gastrointestinal response by the host and gut microbiota. Male and female animals were fed 1×106 CFU/g probiotics in sterile, powdered mouse chow daily and infected with 1 × 107 CFU/ml MAP and compared to controls. Animals were evaluated for 180 days to assess acute and chronic stages of disease, with sample collection from animals every 45 days. MAP concentrations from liver and intestinal tissues were examined using real time-PCR methods and the expression of key inflammatory markers were measured during MAP infection (interferon-gamma [IFN-?], Interleukin-1?, IL-12, IL-10, IL-6, and Tumor necrosis factor alpha [TNF-?]). RESULTS: Our results demonstrate administration of probiotics reduces production of IFN-? and IL-6 while increasing TNF-? and IL-17 in chronic disease; healthful immune responses that reduce chronic inflammation associated to MAP infection. CONCLUSIONS: We observed that the immune system's response in the presence of probiotics to MAP contributes towards host health by influencing the activity of the immune system and gut microbial populations.

Dataset Information

Genome-wide association study of Mycobacterium avium subspecies Paratuberculosis infection in Chinese Holstein.

Publications

Genome-wide association study of Mycobacterium avium subspecies Paratuberculosis infection in Chinese Holstein.

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