Blood:剪接体突变如何影响骨髓增生异常综合征的表型?

2018-06-23 MedSci MedSci原创

SF3B1、SRSF2和U2AF1是骨髓增生异常综合症(MDS)最常见的突变的剪接因子基因。近日,Blood杂志上发表一篇文献,研究人员进行一全面的系统分析,以确定上述常见突变的剪接因子对骨髓干/祖细胞以及剪接因子突变型MDS的红系/髓系前体细胞的pre-mRNA剪接的影响。通过RNA测序,研究人员在84位MDS患者的CD34+细胞中发现异常的剪接基因和失调的信号通路。剪接因子突变可导致剪接的不同

SF3B1、SRSF2和U2AF1是骨髓增生异常综合症(MDS)最常见的突变的剪接因子基因。近日,Blood杂志上发表一篇文献,研究人员进行一全面的系统分析,以确定上述常见突变的剪接因子对骨髓干/祖细胞以及剪接因子突变型MDS的红系/髓系前体细胞的pre-mRNA剪接的影响。

通过RNA测序,研究人员在84位MDS患者的CD34+细胞中发现异常的剪接基因和失调的信号通路。剪接因子突变可导致剪接的不同改变,而且严重影响不同的基因,但这些受影响的基因汇聚在相同的信号通路和细胞进程上,主要集中于RNA剪接、蛋白合成和线粒体功能障碍,提示MDS的共同作用机制。许多上述异常的通路和细胞进程可与已知的与MDS中剪接因子突变相关的疾病病理生理相关,而另外一些既往未报道过与MDS相关,如去乙酰化酶信号。

研究人员还发现与临床变化相关的异常剪接事件和可独立预测MDS患者存活期的亚型,并提示局部黏附和细胞外泌体失调也会减低患者存活率。

在剪接因子突变的MDS患者中,在MDS影响的细胞系中发现异常的剪接基因和失调的信号通路。功能研究证实敲除有丝分裂调节因子SEPT2和AKAP8(SF3B1和SRSF2突变的异常剪接靶基因)可导致红系细胞生长分化受损。

总而言之,本研究阐明了常见剪接体突变对MDS表型的影响,为疾病病理生理提供新的见解。

原始出处:

Andrea Pellagatti, et al.Impact of spliceosome mutations on RNA splicing in myelodysplasia: dysregulated genes/pathways and clinical associations. Blood  2018  :blood-2018-04-843771;  doi: https://doi.org/10.1182/blood-2018-04-843771

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    2018-06-25 tastas

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