【目的】研究中国荷斯坦牛趋化因子受体1基因(Chemokine(C-X-C motif)receptor1,CXCR1)编码区的遗传多态性。【方法】采用巢式PCR、DNA测序和创造酶切位点法,对中国荷斯坦牛CXCR1基因编码区下游区域的单核苷酸多态位点(Single nucleotide polymorphisms,SNPs)进行筛查,并对筛查到的SNPs进行群体遗传多态性分析。【结果】发现了819(A/G)、995(A/G)和1008(C/T)3个SNPs,其中995(A/G)和1008(C/T)为首次报道的多态位点,995(A/G)位点导致第332位的Arg突变为His。CXCR1基因819(A/G)、995(A/G)和1008(C/T)3个位点在中国荷斯坦牛群体的优势等位基因分别为G、G和C,其等位基因频率分别为0.634 0,0.733 0和0.706 4。经χ^2适合性检验,荷斯坦牛在3个位点均未达到Hardy-Weinberg平衡状态(P〈0.05);3个位点均表现为中度多态。【结论】中国荷斯坦牛CXCR1基因编码区的遗传多态性比较丰富。
【Objective】The genetic polymorphism within the coding regions of CXCR1 gene in Chinese Holstein cattle has been detected.【Method】470 of CXCR1 exon of Chinese Holstein cattle were investigated by nested-PCR,DNA sequencing and CRS-PCR.At the same time,the genetic polymorphism of the group was analyzed.【Result】Sequencing results showed that three SNPs were identified,namely 819(A/G),995(A/G),1 008(C/T).819(A/G) and 1 008(C/T) were silent mutations,but 995(A/G) resulted in amino acids alteration Arg332His.In Holstein cattle G and G and C predominant allele were identical at 819(A/G) and 995(A/G) and 1 008(C/T),which were G,G,C and the allelic frequencies were 0.634 0,0.733 0,0.706 4 respectively.χ^2 test indicated that all polymorphic sites did not meet Hardy-Weinberg equilibrium(P〈0.05) in Chinese Holstein cattle.The value of polymorphism information content indicated that 819(A/G),995(A/G) and 1 008(C/T)s were moderate polymorphism in Chinese Holstein cattle.【Conclusion】The genetic polymorphism within the coding regions of CXCR1 gene in Chinese Holstein cattle was abundant.