Neuronal tissue-specific ribonucleoprotein complex formation on SODI mRNA: Alterations by ALS SOD1 mutations

Neuronal tissue-specific ribonucleoprotein complex formation on SODI mRNA: Alterations by ALS SOD1 mutations
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DOI:
10.1016/j.nbd.2006.03.007
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发表时间:
2006-08-01
影响因子:
6.1
通讯作者:
Strong, Michael J.
Strong, Michael J.
中科院分区:
医学1区
文献类型:
--
作者:
Ge, Wei-wen;Leystra-Lantz, Cheryl;Strong, Michael J.

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肌萎缩侧索硬化症(ALS)是一种病因不明的致命疾病。铜/锌超氧化物歧化酶 (SOD1) 突变是最常见的相关遗传异常。鉴于 SOD1 普遍表达,运动神经元独有的脆弱性是 ALS 研究中最令人费解的问题之一。我们在此报道野生型 SOD1 mRNA 与神经元组织的蛋白匀浆形成核糖核蛋白 (RNP) 复合物,但不与非神经元组织的匀浆形成。 SOD1 mRNA 依赖性 RNP 复合物的 3' 非翻译区具有稳定 SOD1 mRNA 的功能。此外,含有 ALS 相关突变(包括沉默突变)的 SOD1 mRNA 在形成 RNP 复合物方面存在缺陷。相比之下,含有人工突变(未知与 ALS 相关)的 SOD1 mRNA 表现出保留的 RNP 复合物形成。本文报道了 SOD1 mRNA 上 RNP 复合物的形成作为神经元组织特异性和 ALS 相关突变敏感特征。 (c) 2006 Elsevier Inc. 保留所有权利。
Amyotrophic lateral sclerosis (ALS) is a fatal disease of unknown etiology. Mutations in copper/zinc superoxide dismutase (SOD1) are the most commonly associated genetic abnormality. Given that SOD1 is ubiquitously expressed, the exclusive vulnerability of motor neurons is one of the most puzzling issues in ALS research. We here report that wild-type SOD1 mRNA forms ribonucleoprotein (RNP) complexes with protein homogenates of neuronal tissue but not with homogenates of non-neuronal tissues. 3' Untranslated region of SOD1 mRNA-dependent RNP complexes functioned to stabilize SOD1 mRNA. Moreover, SOD1 mRNAs harboring ALS-associated mutations, including silent mutations, were deficient in forming RNP complexes. In contrast, SOD1 mRNAs harboring artificial mutations, not known to be associated with ALS, demonstrated preserved RNP complex formation. This paper reports RNP complex formation on SOD1 mRNA as a neuronal tissue-specific and ALS-associated mutation sensitive feature. (c) 2006 Elsevier Inc. All rights reserved.