{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,24]],"date-time":"2026-07-24T02:41:34Z","timestamp":1784860894168,"version":"3.55.0"},"reference-count":53,"publisher":"Oxford University Press (OUP)","issue":"7","license":[{"start":{"date-parts":[[2020,7,1]],"date-time":"2020-07-01T00:00:00Z","timestamp":1593561600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,7,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Egg-laying behavior in Caenorhabditis elegans is a well-known model for investigating fundamental cellular processes. In egg-laying, muscle contraction is the relaxation of the vulval muscle to extrude eggs from the vulva. Unlike skeletal muscle, vulval muscle lacks visible striations of the sarcomere. Therefore, vulval muscle must counteract the mechanical stress, caused by egg extrusion and body movement, from inducing cell-shape distortion by maintaining its cytoskeletal integrity. However, the underlying mechanisms that regulate the cellular integrity in vulval muscles remain unclear. Here, we demonstrate that C. elegans egg-laying requires proper vulval muscle 1 (vm1), in which the actin bundle organization of vm1 muscles is regulated by Ras suppressor protein 1 (RSU-1). In the loss of RSU-1, as well as RasLET-60 overactivation, blister-like membrane protrusions and disorganized actin bundles were observed in the vm1 muscles. Moreover, RasLET-60 depletion diminished the defected actin-bundles in rsu-1 mutant. These results reveal the genetic interaction of RSU-1 and RasLET-60in vivo. In addition, our results further demonstrated that the fifth to seventh leucine-rich region of RSU-1 is required to promote actin-bundling protein, \u03b1-actinin, for actin bundle stabilization in the vm1 muscles. This expands our understanding of the molecular mechanisms of actin bundle organization in a specialized smooth muscle.<\/jats:p>","DOI":"10.1534\/g3.120.401185","type":"journal-article","created":{"date-parts":[[2020,5,28]],"date-time":"2020-05-28T02:14:38Z","timestamp":1590632078000},"page":"2507-2517","source":"Crossref","is-referenced-by-count":4,"title":["RSU-1 Maintains Integrity of<i>Caenorhabditis elegans<\/i>Vulval Muscles by Regulating \u03b1-Actinin"],"prefix":"10.1093","volume":"10","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5344-3281","authenticated-orcid":false,"given":"Xinyan","family":"Wang","sequence":"first","affiliation":[{"name":"Department of Biology"},{"name":"Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, China, and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4077-3505","authenticated-orcid":false,"given":"Shuai","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Biology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8887-3508","authenticated-orcid":false,"given":"Cunni","family":"Zheng","sequence":"additional","affiliation":[{"name":"Department of Biology"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Ge","sequence":"additional","affiliation":[{"name":"Centre of Reproduction, Development and Aging, Faculty of Health Sciences, University of Macau, China, and"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2536-4014","authenticated-orcid":false,"given":"Chuanyue","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Pathology, University of Pittsburgh School of Medicine, PA 15261"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4730-0081","authenticated-orcid":false,"given":"Yu Chung","family":"Tse","sequence":"additional","affiliation":[{"name":"Department of Biology"},{"name":"Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Research, Shenzhen Key Laboratory of Cell Microenvironment, Southern University of Science and Technology, Shenzhen, 518055, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"286","published-online":{"date-parts":[[2020,7,1]]},"reference":[{"key":"2021042105345318600_bib1","doi-asserted-by":"publisher","first-page":"1307","DOI":"10.1242\/jcs.02835","article-title":"The small GTPase R-Ras regulates organization of actin and drives membrane protrusions through the activity of PLCe.","volume":"119","author":"Ada-Nguema","year":"2006","journal-title":"J. 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