端粒对端粒的非洲野生大米 (Oryza longistaminata) 参考基因组显示了细分和结构变异
Xuanmin Guang1,2, Jingnan Yang2,3, Shilai Zhang4
1State Key Laboratory of Genome and Multi-omics Technologies, BGI Research, Shenzhen 518083, China.
GigaScience
|August 18, 2025
概括
一个新的非洲野生大米基因组组合为作物改进提供了宝贵的资源. 这种完整的端粒对端粒 (T2T) 组合有助于探索培养米育种有益的基因.
科学领域:
- 基因组学就是基因组学.
- 植物科学 植物科学
- 农业科学 农业科学
背景情况:
- 非洲野生大米 (Oryza longistaminata) 具有改善栽培大米的有价值特征,包括抗压力和高效繁殖.
- 之前的O. longistaminata的基因组组件存在不完整性,阻碍了详细的基因组研究和育种应用.
研究的目的:
- 为了生成Oryza longistaminata的高质量,完整的端粒到端粒 (T2T) 基因组组.
- 为了促进功能基因组学研究,并简化栽培大米的育种工作.
主要方法:
- 采用了一种混合方法,将PacBio HiFi,Hi-C和CycloneSEQ超长读数结合起来.
- 该组件覆盖了12个染色体中的所有端粒和中间粒,从而产生了331Mb的基因组.
主要成果:
- 取得了显著改善和完整的O. longistaminata的T2T基因组组合.
- 在其他大米基因组中观察到高合成率,同时确定了许多结构变异.
- 确定了2,466个参与氨基酸代谢和抗性基因/转录因子扩张的细分重复基因.
结论:
- 新的O. longistaminata T2T基因组组合是发现和利用野生大米亲属的有益等位基因的关键资源.
- 这一资源将加速对基因功能的研究,并加强栽培大米 (Oryza sativa) 的育种计划.
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