Conversion of 5-methylcytosine to 5-hydroxymethylcytosine in mammalian DNA by MLL partner TET1.

Conversion of 5-methylcytosine to 5-hydroxymethylcytosine in mammalian DNA by MLL partner TET1.
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DOI:
10.1126/science.1170116
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发表时间:
2009-05-15
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Rao A
Rao A
中科院分区:
其他
文献类型:
--
作者:
Tahiliani M;Koh KP;Shen Y;Pastor WA;Bandukwala H;Brudno Y;Agarwal S;Iyer LM;Liu DR;Aravind L;Rao A

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DNA胞嘧啶甲基化对逆转座子沉默和哺乳动物发育至关重要。在对可以修饰5-甲基胞嘧啶(5mC)的酶的计算搜索中,我们确定Tet蛋白是锥体蛋白JBP1和JBP2的哺乳动物同系物,这两种蛋白被认为可以氧化胸腺嘧啶的5-甲基。我们发现TET1是急性髓系白血病MLL基因的融合伙伴,是一种依赖于2-氧戊二酸(2OG)和铁(II)的酶,在培养细胞和体外催化5mC到5-羟甲基胞嘧啶(HMC)的转化。HMC存在于小鼠胚胎干细胞的基因组中,在RNA干扰介导的TET1缺失后,HMC水平降低。因此,Tet蛋白通过将5mC修饰为HMC,在表观遗传调控中具有潜在的作用。
DNA cytosine methylation is crucial for retrotransposon silencing and mammalian development. In a computational search for enzymes that could modify 5-methylcytosine (5mC), we identified TET proteins as mammalian homologs of the trypanosome proteins JBP1 and JBP2, which have been proposed to oxidize the 5-methyl group of thymine. We show here that TET1, a fusion partner of the MLL gene in acute myeloid leukemia, is a 2-oxoglutarate (2OG)- and Fe(II)-dependent enzyme that catalyzes conversion of 5mC to 5-hydroxymethylcytosine (hmC) in cultured cells and in vitro. hmC is present in the genome of mouse embryonic stem cells, and hmC levels decrease upon RNA interference–mediated depletion of TET1. Thus, TET proteins have potential roles in epigenetic regulation through modification of 5mC to hmC.
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