A truncated lamin A in the Lmna -/- mouse line: implications for the understanding of laminopathies.

A truncated lamin A in the Lmna -/- mouse line: implications for the understanding of laminopathies.
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DOI:
10.4161/nucl.21676
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发表时间:
2012-09
期刊:
Nucleus (Austin, Tex.)
影响因子:
--
通讯作者:
Alsheimer M
Alsheimer M
中科院分区:
其他
文献类型:
--
作者:
Jahn D;Schramm S;Schnölzer M;Heilmann CJ;de Koster CG;Schütz W;Benavente R;Alsheimer M

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近年来,许多严重的临床综合征,统称为椎板病,被证明是由人类LMNA基因的各种不同突变引起的。由此,在揭示这些疾病背后的分子病理生理学方面取得了显著进展。在此背景下,Sullivan等人产生的A型纤层蛋白缺陷小鼠系(Lmna−/−)是一个很大的好处,它已成为该领域最常用的模型之一,并为A型纤层蛋白功能的许多不同方面提供了深刻的见解。在这里,我们报告了意想不到的发现,这些小鼠在转录和蛋白质水平上表达一个截断的Lmna基因产物。结合包括质谱在内的不同方法,我们精确地将该产物定义为缺乏蛋白质相互作用和翻译后处理重要结构域的c端截断的层状蛋白a突变体。基于我们的发现,我们讨论了对先前使用Lmna - / -小鼠的研究的解释和人类板层病概念的影响。
During recent years a number of severe clinical syndromes, collectively termed laminopathies, turned out to be caused by various, distinct mutations in the human LMNA gene. Arising from this, remarkable progress has been made to unravel the molecular pathophysiology underlying these disorders. A great benefit in this context was the generation of an A-type lamin deficient mouse line (Lmna−/−) by Sullivan and others, which has become one of the most frequently used models in the field and provided profound insights to many different aspects of A-type lamin function. Here, we report the unexpected finding that these mice express a truncated Lmna gene product on both transcriptional and protein level. Combining different approaches including mass spectrometry, we precisely define this product as a C-terminally truncated lamin A mutant that lacks domains important for protein interactions and post-translational processing. Based on our findings we discuss implications for the interpretation of previous studies using Lmna−/− mice and the concept of human laminopathies.
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