AGING CELL:表观修饰影响早衰和线粒体缺陷

2019-07-14 海北 MedSci原创

在此次的研究中,研究人员发现,Hat1的单倍体不足导致寿命显着缩短。

组蛋白乙酰转移酶1(Hat1)负责在染色质组装过程中新合成的组蛋白H4在赖氨酸5和12上的乙酰化。

为了理解Hat1更广泛的生物学作用,研究人员已经生成了这种酶的条件性小鼠敲除模型。

研究人员以前报道过Hat1是生存所必需的,对哺乳动物的发育和基因组稳定性很重要。

在此次的研究中,研究人员发现,Hat1的单倍体不足导致寿命显着缩短。在Hat1 +/-小鼠中观察到的缺陷与早发性衰老表型一致。这些包括脊柱后凸(驼背),肌肉萎缩,轻微生长迟缓,皮下脂肪减少,癌症和瘫痪。

此外,Hat1的表达与正常的衰老过程有关,因为在老鼠的许多组织中,Hat1 mRNA和蛋白质变得不可检测。

在细胞水平,来自Hat1单倍体不足胚胎的成纤维细胞经历早期衰老并积累高水平的p21。 Hat1 +/-小鼠胚胎成纤维细胞(MEF)显示出内源性DNA损伤的适度增加,但具有显着更高水平的活性氧(ROS)。

一致地,进一步的研究表明,Hat1 - / - MEF表现出线粒体缺陷,表明Hat1在线粒体功能中起关键作用。

总之,这些数据表明,Hat1的丧失诱导了早发性衰老的多重标志。


原始出处:

Prabakaran Nagarajan et al. Early‐onset aging and mitochondrial defects associated with loss of histone acetyltransferase 1 (Hat1). AGING CELL, 2019; doi: https://doi.org/10.1111/acel.12992


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    2020-02-10 维他命
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    2020-01-29 zhaojie88
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    2019-07-16 zhangyxzsh

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