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  • A microsatellite polymorphism in the gamma interferon gene is associated with resistance to gastrointestinal nematodes in a naturally-parasitized population of Soay sheep

Parasitology

Table of Contents - 2001 - Volume 122, Issue 05  


A microsatellite polymorphism in the gamma interferon gene is associated with resistance to gastrointestinal nematodes in a naturally-parasitized population of Soay sheep

D. W.  COLTMAN  a1 c1, K.  WILSON  a2, J. G.  PILKINGTON  a1, M. J.  STEAR  a3 and J. M.  PEMBERTON  a1
a1 Institute of Cell, Animal and Population Biology, University of Edinburgh, Edinburgh EH9 3JT, UK
a2 Institute of Biological Sciences, University of Stirling, Stirling FK9 4LA, UK
a3 Glasgow University Veterinary School, Glasgow G61 1QH, UK

Article author query
coltman d   [PubMed][Google Scholar] 
wilson k   [PubMed][Google Scholar] 
pilkington j   [PubMed][Google Scholar] 
stear m   [PubMed][Google Scholar] 
pemberton j   [PubMed][Google Scholar] 

Abstract

Free-living Soay sheep (Ovis aries) on the island of Hirta, St Kilda, Scotland, are naturally parasitized by gastrointestinal nematodes, predominantly Teladorsagia circumcincta. In this paper we show that reduced faecal egg counts (FEC) are associated with an allele at a microsatellite locus located in the first intron of the interferon gamma gene (o(IFN)-γ) in Soay sheep lambs and yearlings, measured at approximately 4 and 16 months of age, respectively. The same allele was also associated with increased T. circumcincta-specific antibody (IgA) in lambs, but not associated significantly in yearlings. Flanking control markers failed to show a significant association with either FEC or IgA. These results suggest that a polymorphic gene conferring increased resistance to gastrointestinal nematode parasites is located at or near the interferon gamma gene, and support previous reports which have mapped a quantitative trait locus (QTL) for resistance to this region in domestic sheep. Our data are consistent with the idea that a functional polymorphism leading to reduced expression or efficacy of (IFN)-γ could enhance the immune response to gastrointestinal nematodes by favouring the activity of the Th2 cell subset and antibody associated immune mechanisms.

(Received July 4 2000)
(Revised November 13 2000)
(Accepted November 15 2000)


Key Words: cytokine; helminth; immunity; Ovis aries; parasite.

Correspondence:
c1 Corresponding author: Department of Animal and Plant Sciences, Alfred Denny Building, University of Sheffield, Sheffield S10 2TN, UK. E-mail: d.coltman@sheffield.ac.uk

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