微型同胞猪密集繁殖的基因组后果
Hong-Man Chen1,2,3, Heng Zhao1,3, Qun-Yao Zhu1,2
1Yunnan Province Key Laboratory for Porcine Gene Editing and Xenotransplantation, Yunnan Agricultural University, Kunming, 650201, China.
BMC genomics
|February 18, 2025
概括
班纳小型猪 (BN) 的密集的近亲繁殖导致遗传多样性减少和有效种群规模降低 (Ne). 基因组分析揭示了基因负载的增加和有害突变的清除,提供了对近亲繁殖影响的见解.
科学领域:
- 人口基因组学是人口的基因组学.
- 进化生物学是进化的生物学.
- 动物遗传学 动物遗传学
背景情况:
- 亲生繁殖对于特征稳定至关重要,但有风险降低适应性和灭绝.
- 在小型种群中,亲生繁殖的影响得到了很好的研究,但在大型养动物中,人们对其理解较少.
- 班纳迷你近亲生猪 (BN) 品种经历了40多年的近亲繁殖.
研究的目的:
- 研究长期近亲繁殖对Banna迷你近亲生猪 (BN) 的基因组后果.
- 评估内生繁殖对遗传多样性,有效种群规模和遗传负载的影响.
- 提供对繁殖,品种改进和保护策略的基因组洞察力.
主要方法:
- 41只Banna小型猪 (BN) 和Diannan小型猪 (DN) 的高覆盖率全基因组测序.
- 整合已公布的猪全基因组数据进行全面分析.
- 对亚洲野猪进行比较基因组分析.
主要成果:
- BN猪与DN猪具有密切的遗传关系,与繁殖记录保持一致.
- 由于密集的近亲繁殖,BN经历了极端的瓶,导致更高的近亲繁殖系数,减少了遗传多样性,与非近亲生猪相比,实际种群规模 (Ne) 较小.
- 与亚洲野猪相比,BN和DN都表现出较高的遗传负载,BN显示了一些有害突变的清除以及从掩盖到实现的遗传负载的转变.
结论:
- 基因组测量有效地评估了近亲繁殖的后果,特别是当血统数据有限时.
- 这项研究提供了宝贵的基因组资源和对微型猪的近亲繁殖影响的观点.
- 发现可以指导育种计划,品种改进计划和保护家禽的努力.
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