The invertebrate microtubule-associated protein PTL-1 functions in mechanosensation and development in Caenorhabditis elegans.

The invertebrate microtubule-associated protein PTL-1 functions in mechanosensation and development in Caenorhabditis elegans.
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DOI:
10.1007/s00427-008-0250-z
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发表时间:
2008-10
影响因子:
2.4
通讯作者:
Raley-Susman KM
Raley-Susman KM
中科院分区:
生物学4区
文献类型:
--
作者:
Gordon P;Hingula L;Krasny ML;Swienckowski JL;Pokrywka NJ;Raley-Susman KM

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PTL-1是结构MAP 2/tau家族的微管相关蛋白,是秀丽隐杆线虫中该基因家族的唯一成员。对无脊椎动物基因组的序列分析揭示了一些与ptl-1具有高度相似性的单一的、推定的tau样基因。ptl-1基因在许多细胞中表达,最显著的是机械感觉神经元。我们研究了ptl-1在秀丽隐杆线虫在成年神经元以及在发展过程中的作用。一种ptl-1基因敲除的蠕虫表现出卵孵化缺陷,以及对触摸刺激的敏感性降低。此外,敲除等位基因ptl-1(ok 621)作为mec-7和mec-12的几个温度敏感等位基因的显性增强子,这些等位基因编码β-微管蛋白和α-微管蛋白的同种型,这些同种型共同形成参与触觉的不寻常的15个原丝微管。这些结果首次证明了这种微管相关蛋白在线虫中的功能作用,并表明PTL-1参与机械感觉以及胚胎发生的某些方面。
PTL-1, a microtubule-associated protein of the structural MAP2/tau family, is the sole member of this gene family in Caenorhabditis elegans. Sequence analysis of available invertebrate genomes revealed a number of single, putative tau-like genes with high similarity to ptl-1. The ptl-1 gene is expressed in a number of cells, most notably mechanosensory neurons. We examined the role of ptl-1 in Caenorhabditis elegans in adult neurons as well as during development. A ptl-1 knockout strain of worms exhibited an egg hatching defect, as well as a reduced sensitivity to touch stimuli. In addition, the knockout allele ptl-1(ok621) acts as a dominant enhancer of several temperature-sensitive alleles of mec-7 and mec-12, which code the isoforms of β-tubulin and α-tubulin that together form the unusual 15 protofilament microtubules involved in touch sensation. These results demonstrate for the first time a functional role for this microtubule-associated protein in nematodes and suggest that PTL-1 is involved in mechanosensation as well as some aspect of embryogenesis.
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发表时间: 2005-08-01
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影响因子: 10.7
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