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一个转化效率高的精英同系系LH244的近乎完整的基因组组装及其与B73的比较

Kaiwen Tan¹, Xinxiang Liu², Zijian Wang¹

¹State Key Laboratory of Maize Bio-breeding, National Maize Improvement Center, China Agricultural University, Beijing, 100193, China.

Journal of integrative plant biology

|November 29, 2025

概括

为可转换的玉米系LH244创建了一个新的,高质量的基因组组. 该资源使玉米的高级功能基因组学和基因组编辑研究成为可能,揭示了显著的基因组变异和保存区域.

科学领域:

基因组学就是基因组学.
植物生物学植物生物学
玉米的遗传学玉米的遗传学

背景情况:

玉米同系LH244是基因发现和工程的宝贵模型.
高质量的基因组组合的有限可用性阻碍了LH244.4.中的功能基因组学研究.
一个全面的基因组资源对于理解玉米的遗传多样性和改善作物特征至关重要.

研究的目的:

为了生成一个几乎完整的,高精度的基因组组合玉米亲生品系LH244.4.
为了促进功能基因组学和玉米的基因组工程研究.
识别和描述LH244基因组内的结构变异和保存的基因组区域.

主要方法:

使用高通量测序技术组装LH244基因组.
使用端粒对端粒 (T2T) 组装策略来实现连续的基因组序列.
对其他玉米参考基因组 (B73,Mo17) 进行了对比基因组分析.

主要成果:

实现了2.29Gb近乎完整的LH244基因组组装,基准准确率为99.998%.
在LH244和B73.7之间观察到广泛的全基因组合成 (80.06%) 和高基因同一性 (90.92%).
与Mo17相比,在LH244中发现了14个兆基尺度结构变异 (SV),包括45SrDNA阵列中的3.15Mb插入和五个大旋阵列,与Mo17相比,在LH244中发现了3.15Mb插入.

结论:

几乎完整的LH244基因组组合为玉米功能基因组学和基因组编辑提供了关键资源.
对比分析揭示了玉米中显著的物种内基因组变异,强调了多样化的生殖质的重要性.
鉴定的结构变异和保存区域为玉米基因组进化和特征发展提供了洞察力.

关键词:

在 LH244 找 LH244 进行比较的基因组学.一个旋的旋.玉米玉米玉米是一种几乎完整的组装.

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