Nat Genet:维生素C可改变重要表观遗传修饰酶Tet1功能

2013-12-09 MedSci MedSci原创

中科院广州生物医药与健康研究院科学家发现维生素C可改变重要表观遗传修饰酶的功能。相关成果10月27日在线发表于《自然—遗传学》。   据介绍,为使细胞具备各种各样的功能,人体内有许多控制基因的开关,DNA上的甲基化(指胞嘧啶的5位甲基化,5mC)就是其中一个关键性的开关,直接与基因沉默相关。不过,目前学界对去甲基化过程仍不甚明了。   此前有研究发现,Tet蛋白能将5m

中科院广州生物医药与健康研究院科学家发现维生素C可改变重要表观遗传修饰酶的功能。相关成果10月27日在线发表于《自然—遗传学》。

 
据介绍,为使细胞具备各种各样的功能,人体内有许多控制基因的开关,DNA上的甲基化(指胞嘧啶的5位甲基化,5mC)就是其中一个关键性的开关,直接与基因沉默相关。不过,目前学界对去甲基化过程仍不甚明了。
 
此前有研究发现,Tet蛋白能将5mC上的甲基氧化,形成羟甲基,甚至进一步氧化并通过其他机制去除该甲基修饰。然而,作为一个十分重要的表观遗传修饰酶,Tet蛋白的生物学功能和受调控机制还有待深入研究。
 
为此,广州生物院裴端卿研究组和上海生化细胞所徐国良研究组联手攻关,最终发现:Tet1 在体细胞重编程过程中的功能受维生素C调节,生理浓度的维生素C能使Tet1从促进重编程转化为抑制。研究还发现,通过调节细胞培养条件中的维生素C浓 度,可实现Tet1在促进和抑制角色之间的转换:在较高浓度维生素C的情况下,Tet1会显著抑制体细胞重编程过程中一个早期必需的生物学过程——间充质 —上皮转化(MET),从而阻碍体细胞重编程;而在维生素C浓度低于生理浓度两个数量级的情况下,Tet1的这一作用则被隐藏起来。
 
相关专家表示,细胞外环境对细胞状态命运的调控非常复杂,也非常关键。对这种调控模式的理解和运用,将帮助我们在体外更好地获得各种具备细胞治疗等用途的功能细胞。

原始出处:
Chen J, Guo L, Zhang L, Wu H, Yang J, Liu H, Wang X, Hu X, Gu T, Zhou Z, Liu J, Liu J, Wu H, Mao SQ, Mo K, Li Y, Lai K, Qi J, Yao H, Pan G, Xu GL, Pei D.Vitamin C modulates TET1 function during somatic cell reprogramming.Nat Genet. 2013 Dec;45(12):1504-9

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    2014-03-27 liye789132251
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    2014-02-07 cy0324
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    2014-04-11 yhy100200
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    2014-04-15 canlab
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    2013-12-11 zhangyxzsh

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  美国最新研究发现,维生素C可提高试管婴儿成功率,改善人类胚胎干细胞的质量,同时有助于治疗某些癌症。该研究结果由一队包括美国三个圣地亚哥分校和加州大学旧金山分校的科学家发现并发表于上周日发行的《自然》杂志上 。   维生素C是重要的,可维持适当水平的基因在胚胎干细胞上的活性。事实上,维生素C是安全和自然的养分,可使其更容易应用到临床新设置上。维生素C意料之外的作用是它远远超出了原本作为