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评估不同玉米杂交品种中调节 metionin 生物合成的阿斯巴酸激酶2 (ask2) 基因的序列变异,单元型分析和分子特征

Hriipulou Duo¹, Rashmi Chhabra¹, Vignesh Muthusamy¹

¹ICAR-Indian Agricultural Research Institute, New Delhi, India.

Molecular genetics and genomics : MGG

|February 13, 2024

概括

开发高氨酸玉米 (HMM) 对营养至关重要. 阿斯巴酸酶2 (ask2) 的特定基因变异为通过分子繁殖创造HMM提供了一个有希望的途径. 这项研究确定了改善玉米营养价值的关键遗传多样性.

科学领域:

植物遗传学植物遗传学
营养生物化学营养生物化学
分子育种是一种分子育种.

背景情况:

传统的玉米缺乏氨酸,这是一种对人类和家禽发育至关重要的必需氨基酸.
开发高 metionin 玉米 (HMM) 是一个重要的战略,以可持续的方式打击营养不良.
阿斯巴酸酶2 (ask2) 基因是玉米中 metionin积累的关键遗传调节者.

研究的目的:

为了研究玉米杂交品种中ask2基因中的核酸水平变异.
分析ask2基因及其正义基因的遗传多样性和进化关系.
确定有利的等位基因来加速HMM的发展.

主要方法:

在十种玉米杂交品种中对整个ask2基因 (5394 bp,13个外体) 的测序.
基于基因的多样性分析使用11个InDel标记在48种不同的杂交动物上.
在不同物种中对ask2口腔学家进行比较分析.

主要成果:

鉴定了ask2的exon-13中的单个核酸多态 (SNP),导致与氨酸与谷氨胺替代相关的有利基因 (T到A转换).
基因多样性分析显示,48只杂交动物中存在显著的遗传变异,ask2基因被确定为45种类型.
ASK2蛋白质分析预测了玉米和ortologues的同位二维状态和保存的功能域 (氨基酸激酶,ACT).

结论:

在玉米ask2基因中存在足够的遗传多样性,以支持HMM的发展.
通过分子育种,有利的ask2等位基因侵入精英杂交亲系,可以加速HMM的产生.
这项研究为提高玉米的营养特征提供了基础,以应对全球粮食安全和健康挑战.

关键词:

重要的氨基酸是必不可少的.遗传上的不相似性在InDel,我们可以看到.营养不良营养不良甲氨酸 (Methionine) 是一种氨酸.

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