Blood:在VHL基因内含子中发现神秘外显子,突变可导致红细胞增多症或VHL病

2018-06-13 MedSci MedSci原创

中心点:在家族性红细胞增多症或von Hippel-Lindau病患者中发现VHL神秘外显子突变。VHL基因2号外显子上的同义突变或可导致外显子跳跃,从而引发家族性红细胞增多症或或von Hippel-Lindau病。摘要:Chuvash红细胞增多症是一种常染色体隐形遗传的红细胞增多症,与von Hippel-Lindau(VHL)基因上的纯合p.Arg200Trp突变相关。自发现上述致病突变后,

中心点:

在家族性红细胞增多症或von Hippel-Lindau病患者中发现VHL神秘外显子突变。

VHL基因2号外显子上的同义突变或可导致外显子跳跃,从而引发家族性红细胞增多症或或von Hippel-Lindau病。

摘要:

Chuvash红细胞增多症是一种常染色体隐形遗传的红细胞增多症,与von Hippel-Lindau(VHL)基因上的纯合p.Arg200Trp突变相关。自发现上述致病突变后,在先天性红细胞增多症患者中陆续发现更多的纯合或杂合的VHL突变。VHL是一种重要的肿瘤抑制基因,其突变最早是在von Hippel-Lindau病(高度血管化肿瘤)患者中发现的。

Marion Lenglet等人近期在VHL的1号内含子深处发现一新的神秘外显子(命名E1’),E1’在多种组织中自然表达。而且,研究人员在七个红细胞增多症家系中发现E1'突变(1例纯合、6例复合杂合突变[1个E1'突变+1个VHL编码区突变]);另外在一个典型VHL病的大家系中也发现E1'突变,而且在VHL的其他外显子上无任何变异。

研究人员发现突变导致VHL剪接失调、E1'过度保留,进而导致VHL蛋白表达减少。此外,研究人员在五个红细胞增多症或VHL疾病的家系中发现VHL2号外显子上的同义突变具有致病作用,可通过E2跳跃改变剪接。

在本研究囊括的所有病例中,突变差异性影响剪接,与表型严重程度相关。本研究证实神秘外显子保留或外显子跳跃是VHL新的改变方式,揭示了VHL基因的复杂剪接调控。本研究结果为VHL相关的缺氧信号通路的诊断和研究开辟了新的途径。

原始出处:

Marion Lenglet,et al.New lessons from an old gene: complex splicing and a novel cryptic exon in VHL gene cause erythrocytosis and VHL disease. Blood  2018  :blood-2018-03-838235;  doi: https://doi.org/10.1182/blood-2018-03-838235

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    2018-12-29 Eleven21
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    2018-06-14 龙胆草

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