畜牧兽医学报 ›› 2019, Vol. 50 ›› Issue (11): 2235-2243.doi: 10.11843/j.issn.0366-6964.2019.11.007

• 生物技术与繁殖 • 上一篇    下一篇

三个阶段牦牛睾丸发育过程中piRNA的鉴定及分析研究

殷实1,2,3, 秦文昌1,2,3, 王斌1,2,3, 周婧雯1,2,3, 杨柳青1,2,3, 李键1,2,3*   

  1. 1. 西南民族大学生命科学与技术学院, 成都 610041;
    2. 青藏高原动物遗传资源保护与利用教育部重点实验室, 成都 610041;
    3. 青藏高原动物遗传资源保护与利用四川省重点实验室, 成都 610041
  • 收稿日期:2019-05-22 出版日期:2019-11-23 发布日期:2019-11-23
  • 通讯作者: 李键,主要从事牦牛细胞生物学和发育生物学研究,E-mail:jianli_1967@163.com
  • 作者简介:殷实(1988-),男,河南焦作人,博士,讲师,主要从事动物细胞与胚胎工程研究,E-mail:raulyinshi@163.com
  • 基金资助:
    中央高校基本科研业务费专项基金项目(2018NQN33);四川省科技支撑计划(2017NZ0076);牦牛遗传资源与保护创新团队(13CXTD01);西南民族大学研究生创新型科研项目(CX2018SZ10);青藏高原生态畜牧业协同创新中心开放基金(QZGYXT05);青藏高原动物遗传资源保护与利用重点实验室

Identification and Analysis of Relevant piRNA during Testicular Development in Yak of Three Stages

YIN Shi1,2,3, QIN Wenchang1,2,3, WANG Bin1,2,3, ZHOU Jingwen1,2,3, YANG Liuqing1,2,3, LI Jian1,2,3*   

  1. 1. College of Life Science and Technology, Southwest Minzu University, Chengdu 610041, China;
    2. Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization of Ministry of Education, Chengdu 610041, China;
    3. Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Key Laboratory of Sichuan Province, Chengdu 610041, China
  • Received:2019-05-22 Online:2019-11-23 Published:2019-11-23

摘要: 旨在对不同年龄牦牛睾丸发育过程中的piRNA进行鉴定及分析。本研究选择胎牛期(4~5个月)、幼年期(1岁)及青年期(3岁)健康雄性牦牛共6头(每组各两头),分离其睾丸进行piRNA测序,其中来源于同一年龄的两个组织样本视为生物学重复。分析样本中piRNA的数量、碱基偏好性、来源、功能、piRNA簇的染色体分布及表达水平,并利用荧光定量PCR检测3个阶段牦牛睾丸中PIWI家族(PIWIL1~PIWIL4)的表达。结果表明,幼年期及青年期牦牛睾丸中piRNA的数量均显著多于胎牛阶段piRNA的数量(P<0.01)。牦牛睾丸piRNA 5'端具有明显的尿嘧啶(U)偏好性。大部分的piRNA来自基因间区和基因区之外的其他区域。胎牛睾丸中超过60%的piRNA簇处于低丰度,而幼年期及青年期牦牛睾丸组织中超过70%的piRNA簇均处于高丰度。胎牛期睾丸中PIWIL1及PIWIL4的表达与其他两个时期相比存在显著差异(P<0.05)。GO分析发现,piRNA来源基因的数目在生物学过程、细胞组分和分子功能上排在首位的分别为代谢过程、细胞和结合。结果提示,牦牛睾丸中piRNA的结构、功能和来源具有特异性。胚后阶段(幼年期及青年期)牦牛睾丸piRNA的数量及表达丰度与胚胎期相比有显著差异,这可能是与PIWIL1及PIWIL4在两个阶段表达的差异有关。本研究为进一步探索piRNA调控牦牛睾丸的发育机制,以及改善牦牛的生产性能提供了一定的理论基础。

Abstract: This research was conducted to identify and analyze piRNA in the testicular development of yaks of different ages. A total of 6 healthy male yaks (two in each group) in the fetal (4-5 months old), calves (1 year old) and juvenile (3 years old) stages were selected. Testis were separated for piRNA sequencing and two samples from yak at the same age were considered as biological duplications. The number, base preference, source and function of piRNA, as well as the chromosome distribution and expression levels of piRNA clusters in the samples were analyzed. The expression of PIWI gene family(PIWIL1-PIWIL4) in the testis of yak at 3 stages were detected by fluorescence quantitative PCR. The results showed that the number of piRNAs in testis of yaks in calves and juvenile was significantly more than that in fetal stage (P<0.01). piRNAs from yak testis showed a strong preference for uracil (U) at their 5' ends, and the most of the piRNA came from the other regions than the intergenic and gene regions. More than 60% piRNA clusters in fetal testes were at low abundance, while more than 70% clusters in testes of calves and juvenile yaks were at high abundance. The expressions of PIWIL1 and PIWIL4 in fetal testes were significantly different compared with those in the other two stages (P<0.05). GO function analysis result showed that the number of piRNA source genes ranked first in biological process, cell component and molecular function were metabolic process, cell and binding, respectively. The structure, function and source of piRNA in yak testes were specific. The number and expression abundance of piRNA in the post-embryonic stage (calves and juvenile) was significantly different from that in the fetal stage, which may be related to the expression difference of PIWIL1 and PIWIL4 between two stages.This research provides a theoretical basis for further studying the mechanism of piRNA regulating yak testicular development and improving yak production performance.

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