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Open AccessArticle

Association Analysis of Single Nucleotide Polymorphisms in the 5′ Regulatory Region of the IL-6 Gene with Eimeria tenella Resistance in Jinghai Yellow Chickens

1
College of Animal Science and Technology, Yangzhou University, Yangzhou 225009, China
2
Jiangsu Jinghai Poultry Group Co., Ltd., Haimen 226100, China
*
Author to whom correspondence should be addressed.
Genes 2019, 10(11), 890; https://doi.org/10.3390/genes10110890
Received: 5 October 2019 / Revised: 1 November 2019 / Accepted: 4 November 2019 / Published: 5 November 2019
(This article belongs to the Section Animal Genetics and Genomics)
Interleukin 6 (IL-6) is an immunoregulatory cytokine involved in various inflammatory and immune responses. To investigate the effects of single nucleotide polymorphisms (SNPs) and haplotypes of IL-6 on resistance to Eimeria tenella (E. tenella), SNPs in the 5′ regulatory region of IL-6 were detected with direct sequencing, and the effects of SNPs and haplotypes on resistance to E. tenella were analyzed by the least square model in Jinghai yellow chickens. Nineteen SNPs were identified in the 5′ regulation region of IL-6, among which three SNPs were newly discovered. The SNP association analysis results showed that nine of the SNPs were significantly associated with E. tenella resistance indexes; the A-483G locus was significantly associated with the GSH-Px, IL-2, and IL-17 indexes (p < 0.05); the C-447G locus was significantly associated with the SOD, GSH-Px, IL-17, and IL-2 indexes (p < 0.05); and the G-357A locus had significant effects on the CAT and IL-16 indexes (p < 0.05). Haplotype analysis showed that H2H3 and H2H5 were favorable haplotype combinations with good coccidium resistance. Furthermore, we used qRT-PCR and observed that the expression of IL-6 in the infection group was higher than that in the control group in the liver, proventriculus, small intestine, thymus, kidney, and bursa of Fabricius and extremely significantly different than that in the cecum especially (p < 0.01). In summary, SNPs and haplotypes in the 5′ regulatory region of IL-6 have important effects on E. tenella resistance, and the results will provide a reference for molecular marker selection of E. tenella resistance in Jinghai yellow chickens. View Full-Text
Keywords: Jinghai yellow chicken; IL-6 gene; E. tenella; single nucleotide polymorphisms (SNPs); haplotype Jinghai yellow chicken; IL-6 gene; E. tenella; single nucleotide polymorphisms (SNPs); haplotype
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Yu, H.; Zou, W.; Xin, S.; Wang, X.; Mi, C.; Dai, G.; Zhang, T.; Zhang, G.; Xie, K.; Wang, J.; Qiu, C. Association Analysis of Single Nucleotide Polymorphisms in the 5′ Regulatory Region of the IL-6 Gene with Eimeria tenella Resistance in Jinghai Yellow Chickens. Genes 2019, 10, 890.

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