›› 2008, Vol. 28 ›› Issue (2): 90-94.

• 论文 • 上一篇    下一篇

西藏小型猪SLA-DQA基因外显子2

  

  1. 1.南方医科大学实验动物中心,广州 510515;2.广州军区司令部嘉禾生产基地,广州 510440
  • 出版日期:2008-02-29 发布日期:2013-06-06
  • 基金资助:
    广东省农业攻关计划(2006B20201053),广东省科研条件建设项目(2006B60101059)

Studies on Polymorphism of SLA-DQA Gene by PCR-RFLP in Tibet Mini-pigs

  1. 1. Laboratory Animal Centre, Southern Medical University, Guangzhou 510515, China;2. Jiahe Production Base of Guangzhou Military Area Headquaters, 510440, China
  • Online:2008-02-29 Published:2013-06-06

摘要: 目的 分析西藏小型猪SLA-DQA基因第2外显子不同酶切位点的基因型多态性以及等位基因的多态性,检验这些酶切位点上的基因频率是否达到Hardy-Weinberg 平衡态.方法 采用EcoRⅠ和AluⅠ两种限制性内切酶对西藏小型猪SLA-DQA 目的 基因的第1和第2内含子部分序列以及完整的外显子2进行 PCR-RFLP分析.结果 结果 表明,经EcoRⅠ酶切后,以纯合子BB基因型居多,BB、 AB、AA基因型频率分布为0.4500、0.3167和0.2333,其中B 为优势等位基因(0.6083); 经AluⅠ酶切后,MN基因型频率(0.5000)分别高于MM型(0.3000)和 NN型(0.2000),其中M为优势等位基因(0.5500).经卡方适合性检验验证, EcoRⅠ酶切位点c2值未达到显著水平(P>0.05),而AluⅠ酶切位点c2值则具有显著差异( P<0.05).综合双酶切结果 ,共出现7种组合带型,其中 BBMM组合带型出现的频率最高(0.3000),暂没有发现AANN以及 BBNN两种组合带型.结论 西藏小型猪SLA-DQA基因在AluⅠ酶切位点上没有达到Hardy-Weinberg 平衡态,在该位点的遗传选择压力较EcoRⅠ位点大.

关键词: 西藏小型猪, SLA-DQA基因, PCR-RFLP, 多态性

Abstract: Objectives Analyzed genotype and allelic polymorphism of SLA-DQA gene extron 2 in Tibet mini-pigs to detect whether the genotype frequency of restriction enzyme sites was consistent with Hardy-Weinbeig equilibrium. Methods PCR-RFLP was used to analyze the partial sequences of intron 1 and intron 2 and the complete sequence of extron 2 of SLA-DQA in Tibet mini-pigs. Results The restriction enzyme map of EcoR I -RFLP site showed that the genotype frequency of BB(0.4500) was higher than that of AB(0.3167) and AA(0.2333), B was the predominant allele. As for the Alu I site, the genotype frequency of MN(0.5000) was higher than that of MM(0.3000) and NN(0.2000), and M was the predominant allele. According to the values of X2test (chi-square test), the genotypes at EcoR I site didn't reach the significance level(P>0.05〕,while the Alu I site has significant differences (P<0.05). Combined with double enzyme digestion result, there were 7 PCR-RFLP patterns of SLA-DQA gene in Tibet mini-pigs. The genotype frequency of BBMM(0.3000) was higher than other ones, while the genotype AANN or BBNN was not found. Conclusion The SLA-DQA gene of Tibet mini-pigs was not fit Hardy-Weinbeig equilibrium at Alu I site, and the genetic selection pressure of this site was higher than that of EcoR I site.

Key words: Tibet mini-pigs, SIA-DQA, PCR-RFLP, polymorphism