Identification of CXCL8c.105A>G and CXCL8c.210C>T polymorphism in Polish HF cattle

Abstract

Background: Bovine chemokine C-X-C motif legend 8 (CXCL8) also known as interleukin 8 (IL8) is a chemotactic factor that attracts neutrophils, basophils, and T-cells, in response to an inflammatory stimulus. The aim of this study was to investigate the novel single nucleotide polymorphisms (SNPs) located at the promoter region of CXCL8 gene in Polish Holstein Friesian (HF) bulls.

Methods: Genotypic profiling of CXCL8c.105A>G and CXCL8c.210C>T SNP polymorphism were carried out by polymerase chain reaction - restriction fragment length polymorphism (PCR-RFLP) methods using HpyCH4VI and RsaI restriction enzymes. Polymorphism study was conducted on 151 randomly selected Polish HF bulls.

Results: The genotype frequencies of CXCL8c.105A>G SNPs polymorphism in the investigated Polish HF bulls were observed as 0.24%, 0.5% and 0.26% respectively, whereas, the genotype frequencies of CXCL8c.210C>T SNPs polymorphism were observed as 0.27%, 0.5% and 0.23% respectively. Overall, the allele frequencies were recorded higher for “G’ allele for CXCL8c.105A>G and “C” allele and CXCL8c.210C>T SNP polymorphism. In both investigated SNP polymorphism, the state of genetic equilibrium was maintained in Polish HF bulls. Overall, the obtained results identified four haplotypes with the highest frequencies of CG (0.493%) and TA (0.476%) haplotypes, and the lowest frequencies of CA (0.02%) and TG (0.01%) haplotypes, respectively.

Conclusions: Study concludes that both polymorphism could be further investigated for the trait-associated studies in the breeding population of Polish HF cattle.