DNA methyltransferase 1 is essential for and uniquely regulates hematopoietic stem and progenitor cells.

DNA methyltransferase 1 is essential for and uniquely regulates hematopoietic stem and progenitor cells.
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DOI:
10.1016/j.stem.2009.08.016
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发表时间:
2009-10-02
期刊:
影响因子:
23.9
通讯作者:
Orkin SH
Orkin SH
中科院分区:
医学1区
文献类型:
--
作者:
Trowbridge JJ;Snow JW;Kim J;Orkin SH

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DNA甲基化对发育和各种生物过程都是必不可少的。DNA甲基转移酶Dnmt1在有丝分裂细胞的子代DNA链上维持亲本细胞的甲基化模式,然而,Dnmt1在调节静止的成体干细胞中的确切作用尚不清楚。为了研究Dnmt1在成人造血干细胞(HSCs)中的作用,我们有条件地破坏了Dnmt1在造血系统中的作用。在DNMT1缺乏的HSC的自我更新、生态位保留以及DNMT1缺乏的HSC产生多系造血的能力方面都存在缺陷。Dnmt1的缺失对髓系祖细胞也有特殊的影响,导致细胞周期增强和成熟谱系基因的不适当表达。DNMT1调节长期HSCs、多能和谱系受限的祖细胞中不同的甲基化模式和离散基因家族的表达,表明DNMT1对这些群体具有不同的控制作用。这些发现确立了DNMT1在原始造血室中的独特和关键作用。
DNA methylation is essential for development and in diverse biological processes. The DNA methyltransferase Dnmt1 maintains parental cell methylation patterns on daughter DNA strands in mitotic cells, however, the precise role of Dnmt1 in regulation of quiescent adult stem cells is not known. To examine the role of Dnmt1 in adult hematopoietic stem cells (HSCs), we conditionally disrupted Dnmt1 in the hematopoietic system. Defects were observed in Dnmt1 deficient HSC self-renewal, niche retention, and in the ability of Dnmt1 deficient HSCs to give rise to multilineage hematopoiesis. Loss of Dnmt1 also had specific impact on myeloid progenitor cells, causing enhanced cell cycling and inappropriate expression of mature lineage genes. Dnmt1 regulates distinct patterns of methylation and expression of discrete gene families in long-term HSCs, multipotent and lineage-restricted progenitors, suggesting that Dnmt1 differentially controls these populations. These findings establish a unique and critical role for Dnmt1 in the primitive hematopoietic compartment.
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