ATAXIN-2 activates PERIOD translation to sustain circadian rhythms in Drosophila

Chunghun Lim, Ravi Allada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


Evidence for transcriptional feedback in circadian timekeeping is abundant, yet little is known about the mechanisms underlying translational control. We found that ATAXIN-2 (ATX2), an RNA-associated protein involved in neurodegenerative disease, is a translational activator of the rate-limiting clock component PERIOD (PER) in Drosophila. ATX2 specifically interacted with TWENTY-FOUR (TYF), an activator of PER translation. RNA interference -mediated depletion of Atx2 or the expression of a mutant ATX2 protein that does not associate with polyadenylate-binding protein (PABP) suppressed behavioral rhythms and decreased abundance of PER. Although ATX2 can repress translation, depletion of Atx2 from Drosophila S2 cells inhibited translational activation by RNA-tethered TYF and disrupted the association between TYF and PABP. Thus, ATX2 coordinates an active translation complex important for PER expression and circadian rhythms.

Original languageEnglish (US)
Pages (from-to)875-879
Number of pages5
Issue number6134
StatePublished - May 17 2013

ASJC Scopus subject areas

  • General


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