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  • Title: Evaluation of polymorphisms in inflammatory mediator and cellular adhesion genes as risk factors for feline infectious peritonitis.
    Author: Kedward-Dixon H, Barker EN, Tasker S, Kipar A, Helps CR.
    Journal: J Feline Med Surg; 2020 Jun; 22(6):564-570. PubMed ID: 31373532.
    Abstract:
    OBJECTIVES: Feline infectious peritonitis (FIP) is a high mortality infectious disease. Single nucleotide polymorphisms (SNPs) in the genes encoding interferon gamma (IFNG), tumour necrosis factor alpha (TNFA) and dendritic cell-specific intercellular adhesion molecule-grabbing non-integrin (DC-SIGN; CD209) have been associated with increased and decreased risk of developing FIP. This study was designed to determine whether these associations were present in a UK population of pedigree cats using samples from cats euthanased with a confirmed diagnosis (FIP, n = 22; non-FIP, n = 10) or clinically healthy cats over 11 years of age (n = 3). METHODS: DNA was extracted from tissue (n = 32) or blood (n = 3) and PCR performed for regions of IFNG, TNFA and CD209. PCR amplicons were sequenced, each SNP genotype was determined, and genotype/allele frequency for each SNP and FIP status were compared. RESULTS: No significant association was found between the genotype and FIP status for any SNP analysed. There was a trend for the heterozygous CT genotype at both IFNG g.401 and IFNG g.408 to be associated with FIP (P = 0.13), but this genotype was also found in a substantial proportion of non-FIP cats. There was also a trend for the heterozygous CT genotype at IFNG g.428 to be associated with FIP (P = 0.06), although most cats with FIP had the CC genotype at this locus. No associations were found between any allele at TNFA g.-421, CD209 g.1900, CD209 g.2276, CD209 g.2392 and CD209 g.2713 and FIP. CONCLUSIONS AND RELEVANCE: The use of the IFNG, TNFA and CD209 SNPs described to predict the risk of FIP cannot currently be recommended.
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