FHOD-1 is the only formin in Caenorhabditis elegans that promotes striated muscle growth and Z-line organization in a cell autonomous manner.

FHOD-1 is the only formin in Caenorhabditis elegans that promotes striated muscle growth and Z-line organization in a cell autonomous manner.
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DOI:
10.1002/cm.21639
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发表时间:
2020-10
期刊:
Cytoskeleton (Hoboken, N.J.)
影响因子:
--
通讯作者:
Pruyne D
Pruyne D
中科院分区:
其他
文献类型:
--
作者:
Sundaramurthy S;Votra S;Laszlo A;Davies T;Pruyne D

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秀丽隐杆线虫的横纹体壁肌肉是肌节组装的简单模型。此前,我们观察到两个福明基因 fhod-1 和 cyk-1 的缺失突变体发育出具有异常致密体(肌节 Z 线类似物)的瘦肌肉。然而,这项工作留下了疑问,这些福明是否以肌肉细胞自主的方式发挥作用,特别是因为 cyk-1(Δ) 缺失对发育具有多效性影响。使用快速作用的温度敏感 cyk-1(ts) 突变体,我们在此表明​​,胚胎后丢失或胚胎肌瘤发生期间 CYK-1 的急性丢失都不会导致持久的肌肉缺陷。此外,CYK-1在cyk-1(Δ)突变体中的嵌合表达无法以细胞自主方式挽救肌肉缺陷,这表明cyk-1(Δ)引起的肌肉表型可能是间接的。相反,fhod-1(Δ)突变体中FHOD-1的嵌合表达以肌肉细胞自主的方式促进肌肉细胞生长和适当致密的身体组织。由于我们观察到任何其他福明的损失对肌肉发育没有影响,因此我们得出结论,FHOD-1是唯一直接促进横纹肌发育的蠕虫福明,并且与其他系统相比,对秀丽隐杆线虫福明损失的影响出人意料地温和。
The striated body wall muscles of Caenorhabditis elegans are a simple model for sarcomere assembly. Previously, we observed deletion mutants for two formin genes, fhod-1 and cyk-1, develop thin muscles with abnormal dense bodies (the sarcomere Z-line analogs). However, this work left in question whether these formins work in a muscle cell autonomous manner, particularly since cyk-1(Δ) deletion has pleiotropic effects on development. Using a fast acting temperature-sensitive cyk-1(ts) mutant, we show here that neither post-embryonic loss nor acute loss of CYK-1 during embryonic sarcomerogenesis cause lasting muscle defects. Furthermore, mosaic expression of CYK-1 in cyk-1(Δ) mutants is unable to rescue muscle defects in a cell autonomous manner, suggesting muscle phenotypes caused by cyk-1(Δ) are likely indirect. Conversely, mosaic expression of FHOD-1 in fhod-1(Δ) mutants promotes muscle cell growth and proper dense body organization in a muscle cell autonomous manner. As we observe no effect of loss of any other formin on muscle development, we conclude FHOD-1 is the only worm formin that directly promotes striated muscle development, and the effects on formin loss in C. elegans are surprisingly modest compared to other systems.
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