Blood:骨髓增生异常综合征患者的SF3B1基因突变来源于淋巴性造血干细胞

2017-06-22 xiaoxiao MedSci原创

在超过80%的伴环形铁粒幼细胞骨髓增生异常综合征(MDS-RS)患者中发现了RNA剪接基因SF3B1突变。来自瑞典的研究人员研究了MDS-RS患者的骨髓造血干细胞和祖细胞中的SF3B1突变的起源。

剪切因子3B亚基1(subunit 1 of splicing factor 3b,SF3B1)基因编码的蛋白为剪切体中U2小核核糖核蛋白的核心成分,在RNA剪接过程中发挥重要作用。 SF3B1基因突变引起的异常剪接与多种恶性血液病有关,特别是与骨髓增生异常综合征、难治性贫血伴环形铁粒幼细胞增多伴显著血小板增多、慢性淋巴细胞白血病关系密切。在骨髓增生异常综合征中,SF3B1基因突变为其预后的良好因素,而且与环形铁粒幼细胞这一特殊形态学密切相关。

在超过80%的伴环形铁粒幼细胞骨髓增生异常综合征(MDS-RS)患者中发现了RNA剪接基因SF3B1突变。来自瑞典的研究人员研究了MDS-RS患者的骨髓造血干细胞和祖细胞中的SF3B1突变的起源。

研究人员在40例患者中筛查到了39例(97.5%)患者的单核细胞频发SF3B1突变,其中11例(28%)伴有TET2突变和6例(15%)伴有DNMT3A突变。

在所有患者中,单核细胞中被确定的频发突变在典型的造血干细胞(HSC)里也被追溯到,并在下游的髓系和红系祖细胞中也被发现存在。与先前的研究一致,在成熟的B细胞中克隆(SF3B1突变)的证据很少甚至几乎没有,pro-B细胞祖细胞阶段也是一致的,这为SF3B1突变来源于淋巴性HSC提供决定性证据,同时SF3B1突变对淋巴的发展有不良影响。体内外干细胞功能的评价表明,只有HSC和祖细胞介导SF3B1突变的克隆。在免疫缺陷小鼠模型中,SF3B1突变MDS-RS者的造血干细胞分化为典型的环形铁粒幼细胞,这是MDS-RS的标志。

本研究结果为MDS-RS的SF3B1突变来源于淋巴性造血干细胞提供了证据,并为探索MDS-RS的SF3B1突变的机制及治疗提供了一种体内研究模型。

原始出处:

Mortera-Blanco T, Dimitriou M,et al.SF3B1-Initiating Mutations in MDS with Ring Sideroblasts Target Lymphomyeloid Hematopoietic Stem Cells.Blood. 2017 Jun 20. pii: blood-2017-03-776070. doi: 10.1182/blood-2017-03-776070. [Epub ahead of print]

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    2017-06-24 俅侠
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    2017-06-24 紫砂壶

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