Making sense of nonsense GABA(A) receptor mutations associated with genetic epilepsies.

Making sense of nonsense GABA(A) receptor mutations associated with genetic epilepsies.
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DOI:
10.1016/j.molmed.2009.07.003
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发表时间:
2009-09
影响因子:
13.6
通讯作者:
Macdonald RL
Macdonald RL
中科院分区:
医学1区
文献类型:
--
作者:
Kang JQ;Macdonald RL

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产生提前翻译终止密码子(PTC)的无义突变导致了大约三分之一的人类遗传病。电压门控和配基门控离子通道基因,包括钠、钾、烟碱胆碱能受体和GABAA受体通道基因的PTC都与遗传性癫痫有关,但它们引起的癫痫综合征是不同的。我们最近提出了两条成熟的分子途径,即无意义介导的衰变(NMD)和内质网(ER)相关的降解(ERAD),它们决定了与遗传性癫痫相关的GABAA受体亚单位基因中的PTCs对突变亚单位mRNAs和蛋白质的细胞命运的影响。这些不同的分子机制的激活可能部分地导致了GABAA受体亚单位基因PTCS患者不同的临床表型,因此我们建议可能需要不同的方法来治疗他们的遗传性癫痫。
Nonsense mutations that generate premature translation-termination codons (PTCs) are responsible for about one-third of human genetic diseases. PTCs in both voltage- and ligand-gated ion channel genes, including sodium, potassium, nicotinic cholinergic receptor and GABAA receptor channel genes have been associated with genetic epilepsies, but the epilepsy syndromes they cause are variable. We recently proposed that two well-established molecular pathways, nonsense-mediated decay (NMD) and endoplasmic reticulum (ER) associated degradation (ERAD), determine the effects of PTCs in GABAA receptor subunit genes associated with genetic epilepsies on the cellular fates of mutant subunit mRNAs and proteins. Activation of these different molecular mechanisms may contribute partially to different clinical phenotypes in patients with GABAA receptor subunit gene PTCs, and thus we suggest that different approaches for treatment of their genetic epilepsies may be required.
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