Abstract:
:Repeat-associated non-AUG (RAN) translation allows for unconventional initiation at disease-causing repeat expansions. As RAN translation contributes to pathogenesis in multiple neurodegenerative disorders, determining its mechanistic underpinnings may inform therapeutic development. Here we analyze RAN translation at G4C2 repeat expansions that cause C9orf72-associated amyotrophic lateral sclerosis and frontotemporal dementia (C9RAN) and at CGG repeats that cause fragile X-associated tremor/ataxia syndrome. We find that C9RAN translation initiates through a cap- and eIF4A-dependent mechanism that utilizes a CUG start codon. C9RAN and CGG RAN are both selectively enhanced by integrated stress response (ISR) activation. ISR-enhanced RAN translation requires an eIF2α phosphorylation-dependent alteration in start codon fidelity. In parallel, both CGG and G4C2 repeats trigger phosphorylated-eIF2α-dependent stress granule formation and global translational suppression. These findings support a model whereby repeat expansions elicit cellular stress conditions that favor RAN translation of toxic proteins, creating a potential feed-forward loop that contributes to neurodegeneration.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Green KM,Glineburg MR,Kearse MG,Flores BN,Linsalata AE,Fedak SJ,Goldstrohm AC,Barmada SJ,Todd PKdoi
10.1038/s41467-017-02200-0subject
Has Abstractpub_date
2017-12-08 00:00:00pages
2005issue
1issn
2041-1723pii
10.1038/s41467-017-02200-0journal_volume
8pub_type
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