title: The type I membrane protein EFF-1 is essential for developmental cell fusion.
abstract: Multinucleate cells are widespread in nature, yet the mechanism by which cells fuse their plasma membranes is poorly understood. To identify animal fusogens, we performed new screens for mutations that abolish cell fusion within tissues of C. elegans throughout development. We identified the gene eff-1, which is expressed as cells acquire fusion competence and encodes a novel integral membrane protein. EFF-1 sequence motifs suggest physicochemical actions that could cause adjacent bilayers to fuse. Mutations in the extracellular domain of EFF-1 completely block epithelial cell membrane fusion without affecting other perfusion events such as cell generation, patterning, differentiation, and adhesion. Thus, EFF-1 is a key component in the mechanism of cell fusion, a process essential to normal animal development.
authors.affiliation: Department of Genetics and Developmental Biology, University of Connecticut Health Center, Farmington, CT 06030, USA. wmohler@neuron.uchc.edu
authors.forename: William A
authors.initials: WA
authors.lastname: Mohler
authors.forename: Gidi
authors.initials: G
authors.lastname: Shemer
authors.forename: Jacob J
authors.initials: JJ
authors.lastname: del Campo
authors.forename: Clari
authors.initials: C
authors.lastname: Valansi
authors.forename: Eugene
authors.initials: E
authors.lastname: Opoku-Serebuoh
authors.forename: Victoria
authors.initials: V
authors.lastname: Scranton
authors.forename: Nirit
authors.initials: N
authors.lastname: Assaf
authors.forename: John G
authors.initials: JG
authors.lastname: White
authors.forename: Benjamin
authors.initials: B
authors.lastname: Podbilewicz
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D017173:Caenorhabditis elegans / Q000254:growth & development / Q000502:physiology*; D002459:Cell Fusion; D000078404:Epidermal Cells; D004817:Epidermis / Q000254:growth & development; D004847:Epithelial Cells / Q000166:cytology; D005260:Female; D018507:Gene Expression Regulation, Developmental; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism; D015801:Helminth Proteins / Q000235:genetics / Q000378:metabolism*; D008561:Membrane Fusion / Q000502:physiology*; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation / Q000502:physiology; D010641:Phenotype; D014844:Vulva / Q000166:cytology / Q000254:growth & development
chemical_list: D006023:Glycoproteins; D015801:Helminth Proteins; D008565:Membrane Proteins