RNA surveillance is required for endoplasmic reticulum homeostasis.

Proceedings of the National Academy of Sciences of the United States of America
Kenjiro SakakiRandal J Kaufman

Abstract

The unfolded protein response (UPR) is an intracellular stress-signaling pathway that counteracts the accumulation of misfolded proteins in the endoplasmic reticulum (ER). Because defects in ER protein folding are associated with many pathological states, including metabolic, neurologic, genetic, and inflammatory diseases, it is important to understand how the UPR maintains ER protein-folding homeostasis. All metazoans have conserved the fundamental UPR transducers IRE1, ATF6, and PERK. In Caenorhabditis elegans, the UPR is required to prevent larval lethality and intestinal degeneration. Although ire-1-null worms are viable, they are particularly sensitive to ER stress. To identify genes that are required for development of ire-1-null worms, we performed a comprehensive RNA interference screen to find 10 genes that exhibit synthetic growth and intestinal defects with the ire-1(v33) mutant but not with atf-6(tm1153) or pek-1(ok275) mutants. The expression of two of these genes, exos-3 and F48E8.6, was induced by ER stress, and their knockdown in a wild-type strain caused ER stress. Because these genes encode subunits of the exosome complex that functions in mRNA surveillance, we analyzed other gene products required for nonsens...Continue Reading

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