The genomic architecture of resistance to Campylobacter jejuni intestinal colonisation in chickens.

Abstract:

BACKGROUND:Campylobacter is the leading cause of foodborne diarrhoeal illness in humans and is mostly acquired from consumption or handling of contaminated poultry meat. In the absence of effective licensed vaccines and inhibitors, selection for chickens with increased resistance to Campylobacter could potentially reduce its subsequent entry into the food chain. Campylobacter intestinal colonisation levels are influenced by the host genetics of the chicken. In the present study, two chicken populations were used to investigate the genetic architecture of avian resistance to colonisation: (i) a back-cross of two White Leghorn derived inbred lines [(61 x N) x N] known to differ in resistance to Campylobacter colonisation and (ii) a 9(th) generation advanced intercross (61 x N) line. RESULTS:The level of colonisation with Campylobacter jejuni following experimental infection was found to be a quantitative trait. A back-cross experiment using 1,243 fully informative single nucleotide polymorphism (SNP) markers revealed quantitative trait loci (QTL) on chromosomes 7, 11 and 14. In the advanced intercross line study, the location of the QTL on chromosome 14 was confirmed and refined and two new QTLs were identified located on chromosomes 4 and 16. Pathway and re-sequencing data analysis of the genes located in the QTL candidate regions identified potential pathways, networks and candidate resistance genes. Finally, gene expression analyses were performed for some of the candidate resistance genes to support the results. CONCLUSION:Campylobacter resistance in chickens is a complex trait, possibly involving the Major Histocompatibility Complex, innate and adaptive immune responses, cadherins and other factors. Two of the QTLs for Campylobacter resistance are co-located with Salmonella resistance loci, indicating that it may be possible to breed simultaneously for enhanced resistance to both zoonoses.

journal_name

BMC Genomics

journal_title

BMC genomics

authors

Psifidi A,Fife M,Howell J,Matika O,van Diemen PM,Kuo R,Smith J,Hocking PM,Salmon N,Jones MA,Hume DA,Banos G,Stevens MP,Kaiser P

doi

10.1186/s12864-016-2612-7

subject

Has Abstract

pub_date

2016-04-18 00:00:00

pages

293

issn

1471-2164

pii

10.1186/s12864-016-2612-7

journal_volume

17

pub_type

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