RRC ID 53349
Author Hegsted A, Wright FA, Votra S, Pruyne D.
Title INF2- and FHOD-related formins promote ovulation in the somatic gonad of C. elegans.
Journal Cytoskeleton (Hoboken)
Abstract Formins are regulators of actin filament dynamics. We demonstrate here that two formins, FHOD-1 and EXC-6, are important in the nematode Caenorhabditis elegans for ovulation, during which actomyosin contractions push a maturing oocyte from the gonad arm into a distensible bag-like organ, the spermatheca. EXC-6, a homolog of the disease-associated mammalian formin INF2, is highly expressed in the spermatheca, where it localizes to cell-cell junctions and to circumferential actin filament bundles. Loss of EXC-6 does not noticeably affect the organization the actin filament bundles, and causes only a very modest increase in the population of junction-associated actin filaments. Despite absence of a strong cytoskeletal phenotype, approximately half of ovulations in exc-6 mutants exhibit extreme defects, including failure of the oocyte to enter the spermatheca, or breakage of the oocyte as the distal spermatheca entrance constricts during ovulation. Loss of FHOD-1 alone has little effect, and we cannot detect FHOD-1 in the spermatheca. However, combined loss of these formins in double fhod-1;exc-6 mutants results in profound ovulation defects, with significant slowing of the entry of oocytes into the spermatheca, and failure of nearly 80% of ovulations. We suggest that EXC-6 plays a role directly in the spermatheca, perhaps by modulating the ability of the spermatheca wall to rapidly accommodate an incoming oocyte, while FHOD-1 may play an indirect role relating to its known importance in the growth and function of the egg-laying muscles. © 2016 The Authors. Cytoskeleton Published by Wiley Periodicals, Inc.
Volume 73(12)
Pages 712-728
Published 2016-12-1
DOI 10.1002/cm.21341
PMID 27770600
PMC PMC5148669
MeSH Actin Cytoskeleton / immunology Actin Cytoskeleton / metabolism* Animals Caenorhabditis elegans / genetics Caenorhabditis elegans / metabolism* Caenorhabditis elegans Proteins / genetics Caenorhabditis elegans Proteins / metabolism* Female Formins Male Microfilament Proteins / genetics Microfilament Proteins / metabolism* Oocytes / metabolism* Ovulation / genetics Ovulation / metabolism*
IF 1.7
Times Cited 6
C.elegans tm2363 tm3138