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中国西门塔尔牛CACNA2D1基因的遗传变异及其与屠宰性状的关联分析

DOI: 10.7668/hbnxb.2011.04.009, PP. 50-60

Keywords: 中国西门塔尔牛,CACNA2D1基因,SNP芯片技术,屠宰性状,关联分析

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Abstract:

旨在研究中国西门塔尔牛CACNA2D1基因的遗传变异及其与屠宰性状的关系。本试验与所采用的传统的PCR-SSCP或者PCR-RFLP技术不同,首次借助高通量SNP芯片技术在136头中国西门塔尔牛群体中对CACNA2D1基因的遗传变异进行了研究。结果显示,在中国西门塔尔牛CACNA2D1基因上总计发现12个有效SNP位点,其中4个位点Ho、He和PIC值较低属于中低度多态,8个位点属于高度多态。卡方适合性检验表明,10个位点处于HarDY-Weinberg平衡状态(P>0.05)。各位点遗传变异与屠宰性状进行关联分析显示,位点1不同基因型个体在肉色性状方面差异显著(P<0.05),位点2不同基因型个体在大腿肉厚方面差异显著(P<0.05),位点3不同基因型个体在胴体重、屠宰率、眼肌面积和大腿肉厚几个重要屠宰性状差异显著(P<0.05),在肉色性状达到了差异极显著(P<0.01)。位点3杂合子AB基因型为优势基因型,其他位点AA为优势基因型。本研究表明,CACNA2D1基因可以作为中国西门塔尔牛部分屠宰性状候选基因,尤其是位点3可以作为中国西门塔尔牛屠宰性状的重要潜在分子标记,从而为中国西门塔尔牛现代育种提供一定参考。

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