Changes in organelle position and epithelial architecture associated with loss of CrebA

Rebecca M. Fox, Deborah J. Andrew

Research output: Contribution to journalArticlepeer-review

Abstract

Drosophila CrebA facilitates high-level secretion by transcriptional upregulation of the protein components of the core secretory machinery. In CrebA mutant embryos, both salivary gland (SG) morphology and epidermal cuticle secretion are abnormal, phenotypes similar to those observed with mutations in core secretory pathway component genes. Here, we examine the cellular defects associated with CrebA loss in the SG epithelium. Apically localized secretory vesicles are smaller and less abundant, consistent with overall reductions in secretion. Unexpectedly, global mislocalization of cellular organelles and excess membrane accumulation in the septate junctions (SJs) are also observed. Whereas mutations in core secretory pathway genes lead to organelle localization defects similar to those of CrebA mutants, they have no effect on SJ-associated membrane. Mutations in tetraspanin genes, which are normally repressed by CrebA, have mild defects in SJ morphology that are rescued by simultaneous CrebA loss. Correspondingly, removal of several tetraspanins gives partial rescue of the CrebA SJ phenotype, supporting a role for tetraspanins in SJ organization.

Original languageEnglish (US)
Pages (from-to)317-330
Number of pages14
JournalBiology Open
Volume4
Issue number3
DOIs
StatePublished - Mar 15 2015

Keywords

  • Creb3-like
  • CrebA
  • Drosophila
  • Salivary gland
  • Secretion
  • Secretory organelles
  • Septate junction

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

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