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Published on: February 13, 2012

A directed RNAi screen based on larval growth arrest reveals new modifiers of C. elegans insulin signaling

Ola Billing1, Balasubramanian Natarajan, Ateequrrahman Mohammed

  • 1Department of Surgical and Perioperative Sciences, Umeå University, Umeå, Sweden.

Plos One
|April 19, 2012
PubMed

Insights

New genes regulating Caenorhabditis elegans insulin/IGF signaling (IIS) were discovered through L1 diapause screening. These genes impact IIS strength and insulin secretion, involving the Golgi and mitochondria.

Area of Science:

  • Genetics
  • Molecular Biology
  • Developmental Biology

Background:

  • Insulin/IGF signaling (IIS) in Caenorhabditis elegans is primarily studied for its roles in dauer development and longevity.
  • A less-explored IIS phenotype is the first larval stage (L1) diapause, influenced by the asna-1 gene, a regulator of insulin secretion.

Purpose of the Study:

  • To identify novel regulators of IIS strength by screening for genes affecting the asna-1-like L1 diapause phenotype.
  • To uncover new components involved in the regulation of insulin secretion.

Main Methods:

  • A genetic screen was performed to identify genes exhibiting an asna-1-like larval arrest phenotype.
  • Eighty-six candidate genes predicted to interact with ASNA-1 were analyzed.
  • Phenotypic analysis, including assessment of feeding defects and IIS strength, was conducted on identified mutants.

Main Results:

  • Four genes (ykt-6, mrps-2, mrps-10, and mrpl-43) were identified as causing larval arrest without feeding defects upon inactivation.
  • These mutants displayed reduced IIS strength and defective insulin secretion.
  • The study implicates the Golgi network and mitochondria in the process of insulin secretion.

Conclusions:

  • The study identifies novel genes modulating Caenorhabditis elegans IIS and L1 diapause.
  • It highlights the crucial roles of the Golgi network and mitochondria in regulating insulin secretion.
  • This research expands the known genetic network controlling IIS in C. elegans.

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