{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T15:45:38Z","timestamp":1791301538361,"version":"4.1.0"},"reference-count":66,"publisher":"The Company of Biologists","issue":"11","license":[{"start":{"date-parts":[[1998,6,1]],"date-time":"1998-06-01T00:00:00Z","timestamp":896659200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/www.biologists.com\/user-licence-1-1\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1998,6,1]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>The spectrin membrane skeleton is a ubiquitous cytoskeletal structure with several cellular roles, including the maintenance of cell integrity, determination of cell shape and as a contributor to cell polarity. We have isolated mutations in the gene encoding \u03b2Heavy-spectrin in Drosophila, and have named this essential locus karst. karst mutant individuals have a pleiotropic phenotype characterized by extensive larval lethality and, in adult escapers, rough eyes, bent wings, tracheal defects and infertility. Within karst mutant eyes, a significant number of ommatidia specifically lack photoreceptor R7 alongside more complex morphological defects.<\/jats:p>\n               <jats:p>Immunolocalization of \u03b2Heavy-spectrin in wild-type eye-antennal and wing imaginal discs reveals that \u03b2Heavy-spectrin is present in a restricted subdomain of the membrane skeleton that colocalizes with DE-cadherin. We propose a model where normal levels of Sevenless signaling are dependent on tight cell-cell adhesion facilitated by the \u03b2Heavy-spectrin membrane skeleton.<\/jats:p>\n               <jats:p>Immunolocalization of \u03b2Heavy-spectrin in the adult and larval midgut indicates that it is a terminal web protein, but we see no gross morphological defects in the adult apical brush border in karst mutant flies. Rhodamine phalloidin staining of karst mutant ovaries similarly reveals no conspicuous defect in the actin cytoskeleton or cellular morphology in egg chambers. This is in contrast to mutations in \u03b1-spectrin, the molecular partner of \u03b2Heavy-spectrin, which affect cellular structure in both the larval gut and adult ovaries.<\/jats:p>\n               <jats:p>Our results emphasize the fundamental contribution of the spectrin membrane skeleton to normal development and reveals a critical interplay between the integrity of a cell\u2019s membrane skeleton, the structure of cell-cell contacts and cell signaling.<\/jats:p>","DOI":"10.1242\/dev.125.11.2125","type":"journal-article","created":{"date-parts":[[2021,4,26]],"date-time":"2021-04-26T03:15:51Z","timestamp":1619406951000},"page":"2125-2134","source":"Crossref","is-referenced-by-count":66,"title":["<i>Drosophila<\/i> \u03b2Heavy-spectrin is essential for development and contributes to specific cell fates in the eye"],"prefix":"10.1242","volume":"125","author":[{"given":"Claire M.","family":"Thomas","sequence":"first","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniela C.","family":"Zarnescu","sequence":"additional","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amy E.","family":"Juedes","sequence":"additional","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark A.","family":"Bales","sequence":"additional","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amy","family":"Londergan","sequence":"additional","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carol C.","family":"Korte","sequence":"additional","affiliation":[{"name":"1 Departments of Biology and of Biochemistry and Molecular Biology, The Pennsylvania State University, University Park, PA 16802, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel P.","family":"Kiehart","sequence":"additional","affiliation":[{"name":"2 Department of Cell Biology, Duke University Medical Center, Durham, NC 27710, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"237","published-online":{"date-parts":[[1998,6,1]]},"reference":[{"key":"2025021501145503700_DEVELOP_125_11_2125C1","doi-asserted-by":"crossref","first-page":"1899","DOI":"10.1083\/jcb.135.6.1899","article-title":"Quantitative analysis of cadherin-catenin-actin reorganization during development of cell-cell adhesion","volume":"135","author":"Adams","year":"1996","journal-title":"J. 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