Pat-12, an atypical Pat protein involved in fibrous organelles in C. elegans

pat-12;elegans;hemidesmosomes;integrin;hypodermis;fibrous organelle

Rhine, Jonathan

关键词: pat-12;    elegans;    hemidesmosomes;    integrin;    hypodermis;    fibrous organelle;   

Others  :  https://www.ideals.illinois.edu/bitstream/handle/2142/44269/Jonathan_Rhine.pdf?sequence=1&isAllowed=y

美国|英语

来源: The Illinois Digital Environment for Access to Learning and Scholarship

【 摘 要 】

Forces generated by body wall muscles of Caenorhabditis elegans must be transmitted across the worm’s thin hypodermis or “skin” to the cuticle during locomotion.Fibrous organelles (FOs), structures analogous to vertebrate hemidesmosomes, link intermediate filaments to both the apical and basal membrane of the hypodermal cells and form key elements in this force transduction pathway.Here we molecularly isolate the pat-12 gene and show that it encodes a component of the fibrous organelles. The pat-12 gene was identified through the pat-12(st430) mutation, which causes the embryonic body wall muscle cells to rip free from the body wall soon after they first begin to contract during mid-embryogenesis.The pat-12 gene, which corresponds to the complex proposed gene T17H7.4, is predicted to encode 12 different isoforms.The st430 mutation alters the conserved splice acceptor site of exon 12.The PAT-12 protein localizes to hypodermal cells in wild-type embryos, but is absent in st430 homozygotes.Here, we show that two of the four isoforms that normally include exon 12 localize to circumferential hypodermal bands characteristic of fibrous organelle components.Furthermore, we propose that PAT-12 forms part of a linkage between the fibrous organelles and the circumferential actin bands (CFB).