FBN-1, a fibrillin-related protein, is required for resistance of the epidermis to mechanical deformation during C. elegans embryogenesis

  1. Melissa Kelley
  2. John Yochem
  3. Michael Krieg
  4. Andrea Calixto
  5. Maxwell G Heiman
  6. Aleksandra Kuzmanov
  7. Vijaykumar Meli
  8. Martin Chalfie
  9. Miriam B Goodman
  10. Shai Shaham
  11. Alison Frand
  12. David S Fay  Is a corresponding author
  1. University of Wyoming, United States
  2. Stanford University, United States
  3. Columbia University, United States
  4. Boston Children's Hospital, United States
  5. University of California, United States
  6. Standford University, United States
  7. The Rockefeller University, United States

Abstract

During development, biomechanical forces contour the body and provide shape to internal organs. Using genetic and molecular approaches in combination with a FRET-based tension sensor, we characterized a pulling force exerted by the elongating pharynx (foregut) on the anterior epidermis during C. elegans embryogenesis. Resistance of the epidermis to this force and to actomyosin-based circumferential constricting forces is mediated by FBN-1, a ZP domain protein related to vertebrate fibrillins. fbn-1 was required specifically within the epidermis and FBN-1 was expressed in epidermal cells and secreted to the apical surface as a putative component of the embryonic sheath. Tiling array studies indicated that fbn-1 mRNA processing requires the conserved alternative splicing factor MEC-8/RBPMS. The conserved SYM-3/FAM102A and SYM-4/WDR44 proteins, which are linked to protein trafficking, function as additional components of this network. Our studies demonstrate the importance of the apical extracellular matrix in preventing mechanical deformation of the epidermis during development.

Article and author information

Author details

  1. Melissa Kelley

    Department of Molecular Biology, University of Wyoming, Laramie, United States
    Competing interests
    The authors declare that no competing interests exist.
  2. John Yochem

    Department of Molecular Biology, University of Wyoming, Laramie, United States
    Competing interests
    The authors declare that no competing interests exist.
  3. Michael Krieg

    Department of Molecular and Cellular Physiology, Stanford University, Stanford, United States
    Competing interests
    The authors declare that no competing interests exist.
  4. Andrea Calixto

    Department of Biological Sciences, Columbia University, New York, United States
    Competing interests
    The authors declare that no competing interests exist.
  5. Maxwell G Heiman

    Department of Genetics, Harvard Medical School, Boston Children's Hospital, Boston, United States
    Competing interests
    The authors declare that no competing interests exist.
  6. Aleksandra Kuzmanov

    Department of Molecular Biology, University of Wyoming, Laramie, United States
    Competing interests
    The authors declare that no competing interests exist.
  7. Vijaykumar Meli

    Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, United States
    Competing interests
    The authors declare that no competing interests exist.
  8. Martin Chalfie

    Department of Biological Sciences, Columbia University, New York, United States
    Competing interests
    The authors declare that no competing interests exist.
  9. Miriam B Goodman

    Department of Molecular and Cellular Physiology, Standford University, Stanford, United States
    Competing interests
    The authors declare that no competing interests exist.
  10. Shai Shaham

    Laboratory of Developmental Genetics, The Rockefeller University, New York, United States
    Competing interests
    The authors declare that no competing interests exist.
  11. Alison Frand

    Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, United States
    Competing interests
    The authors declare that no competing interests exist.
  12. David S Fay

    Department of Molecular Biology, University of Wyoming, Laramie, United States
    For correspondence
    davidfay@uwyo.edu
    Competing interests
    The authors declare that no competing interests exist.

Reviewing Editor

  1. Julie Ahringer, University of Cambridge, United Kingdom

Version history

  1. Received: January 19, 2015
  2. Accepted: March 20, 2015
  3. Accepted Manuscript published: March 23, 2015 (version 1)
  4. Version of Record published: April 14, 2015 (version 2)

Copyright

© 2015, Kelley et al.

This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.

Metrics

  • 2,996
    views
  • 625
    downloads
  • 50
    citations

Views, downloads and citations are aggregated across all versions of this paper published by eLife.

Download links

A two-part list of links to download the article, or parts of the article, in various formats.

Downloads (link to download the article as PDF)

Open citations (links to open the citations from this article in various online reference manager services)

Cite this article (links to download the citations from this article in formats compatible with various reference manager tools)

  1. Melissa Kelley
  2. John Yochem
  3. Michael Krieg
  4. Andrea Calixto
  5. Maxwell G Heiman
  6. Aleksandra Kuzmanov
  7. Vijaykumar Meli
  8. Martin Chalfie
  9. Miriam B Goodman
  10. Shai Shaham
  11. Alison Frand
  12. David S Fay
(2015)
FBN-1, a fibrillin-related protein, is required for resistance of the epidermis to mechanical deformation during C. elegans embryogenesis
eLife 4:e06565.
https://doi.org/10.7554/eLife.06565

Share this article

https://doi.org/10.7554/eLife.06565

Further reading

    1. Cell Biology
    Elizabeth A Beath, Cynthia Bailey ... Francis J McNally
    Research Article

    Fertilization occurs before the completion of oocyte meiosis in the majority of animal species and sperm contents move long distances within the zygotes of mouse and C. elegans. If incorporated into the meiotic spindle, paternal chromosomes could be expelled into a polar body resulting in lethal monosomy. Through live imaging of fertilization in C. elegans, we found that the microtubule disassembling enzymes, katanin and kinesin-13 limit long-range movement of sperm contents and that maternal ataxin-2 maintains paternal DNA and paternal mitochondria as a cohesive unit that moves together. Depletion of katanin or double depletion of kinesin-13 and ataxin-2 resulted in the capture of the sperm contents by the meiotic spindle. Thus limiting movement of sperm contents and maintaining cohesion of sperm contents within the zygote both contribute to preventing premature interaction between maternal and paternal genomes.

    1. Cell Biology
    Joanne Tung, Lei Huang ... Adriana Ordonez
    Research Article

    Activating transcription factor 6 (ATF6) is one of three endoplasmic reticulum (ER) transmembrane stress sensors that mediate the unfolded protein response (UPR). Despite its crucial role in long-term ER stress adaptation, regulation of ATF6 alpha (α) signalling remains poorly understood, possibly because its activation involves ER-to-Golgi and nuclear trafficking. Here, we generated an ATF6α/Inositol-requiring kinase 1 (IRE1) dual UPR reporter CHO-K1 cell line and performed an unbiased genome-wide CRISPR/Cas9 mutagenesis screen to systematically profile genetic factors that specifically contribute to ATF6α signalling in the presence and absence of ER stress. The screen identified both anticipated and new candidate genes that regulate ATF6α activation. Among these, calreticulin (CRT), a key ER luminal chaperone, selectively repressed ATF6α signalling: Cells lacking CRT constitutively activated a BiP::sfGFP ATF6α-dependent reporter, had higher BiP levels and an increased rate of trafficking and processing of ATF6α. Purified CRT interacted with the luminal domain of ATF6α in vitro and the two proteins co-immunoprecipitated from cell lysates. CRT depletion exposed a negative feedback loop implicating ATF6α in repressing IRE1 activity basally and overexpression of CRT reversed this repression. Our findings indicate that CRT, beyond its known role as a chaperone, also serves as an ER repressor of ATF6α to selectively regulate one arm of the UPR.