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Updated: Jun 27, 2025

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保存8号染色体的反转和前突变证实了灵长类动物中常见的古洛诺拉克氧化酶基因进化,包括H. Neanderthalensis

Alexander Mansueto^1,2, Deborah J Good^3,4

¹Department of Human Nutrition, Foods, and Exercise, Virginia Tech, Blacksburg, VA, USA.

Journal of molecular evolution

|April 29, 2024

概括

人类不能产生甲酸 (维生素C) 由于非功能性甲酸氧化酶伪原体 (GULOP). 这项研究研究了灵长类动物和其他哺乳动物的GULOP基因进化,揭示了高突变率和GULO/GULOP位点附近的保存重排.

科学领域:

进化生物学是进化的生物学.
基因组学就是基因组学.
生物化学生物化学

背景情况:

亚酸 (维生素C) 对人类健康至关重要,作为抗氧化剂,促进原蛋白合成和铁的吸收.
不同于大多数具有功能性gulolactone oxidase (GULO) 基因的动物,人类拥有非功能性gulo伪基因 (GULOP),需要通过饮食摄入维生素C.
了解GULO/GULOP的进化历史对于了解维生素C代谢和基因进化至关重要.

研究的目的:

研究古洛和古洛普序列在灵长类子序列 (Haplorhini和Strepsirrhini) 的进化保护和突变模式.
将灵长类动物的GULO/GULOP进化与其他胎盘哺乳动物的进化进行比较,包括巴西海豚和皮卡.
分析围绕GULO/GULOP位点的基因组上下文和合成,以确定保存或可变的重排.

主要方法:

在Haplorhini中对GULOP外因子序列的基因组学分析和与Strepsirrhini中的GULO序列的比较.
在胎盘哺乳动物中对GULO和GULOP进行序列分析,包括识别潜在的功能或伪基序列.
分享合成分析和Mauve对齐以检查基因序列的保存和围绕GULO/GULOP位点的重排.

主要成果:

在Haplorhini灵长类动物中保存的GULOP异构体在分歧后表现出高的突变率,后来这种突变率下降.
在Haplorhini GULOP序列中观察到保存的内.
在巴西海豚中发现了一个框架内GULO序列,在皮卡中发现了一个潜在的GULOP序列,两者都表现出类似于Haplorhini灵长类动物的高置换率.
在Haplorhini和Strepsirrhini之间确定了围绕GULO/GULOP位点的保守反转,尽管与GULOP功能没有直接关联.
在GULOP附近检测到可变的反转长度和频繁的重排,涉及KIF13B和MSRA基因.

结论:

在Haplorhini灵长类动物中,GULOP基因经历了显著的进化变化,包括高突变率和保存的重排.
这些发现表明,编码序列中的有害突变与快速替代率之间的潜在联系是进化反应.
跨物种对GULO/GULOP的比较基因组学提供了对维生素C合成途径和基因调节的演变的见解.

关键词:

亚斯科布酸是一种亚斯科布酸.格鲁卢卢是一个古鲁卢.这就是GULOP的意义.尼安德特人尼安德特人人类的家谱 (Phylogeny) 是一个学科.灵长类动物灵长类动物维生素C 维生素C是一种

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