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Mammalian ataxin-2 modulates translation control at the pre-initiation complex via PI3K/mTOR and is induced by starvation

AuthorsLastres-Becker, Isabel ; Gorospe, Myriam; Auburger, Georg
KeywordsmRNA translation
Amyotrophic lateral sclerosis
Spinocerebellar Ataxia type 2
Diabetes mellitus
Issue Date2016
CitationBBA - Molecular Basis of Disease 1862(9): 1558-1569 (2016)
AbstractAtaxin-2 is a cytoplasmic protein, product of the ATXN2 gene, whose deficiency leads to obesity, while its gain-of-function leads to neural atrophy. Ataxin-2 affects RNA homeostasis, but its effects are unclear. Here, immunofluorescence analysis suggested that ataxin-2 associates with 48S pre-initiation components at stress granules in neurons and mouse embryonic fibroblasts, but is not essential for stress granule formation. Coimmunoprecipitation analysis showed associations of ataxin-2 with initiation factors, which were concentrated at monosome fractions of polysome gradients like ataxin-2, unlike its known interactor PABP. Mouse embryonic fibroblasts lacking ataxin-2 showed increased phosphorylation of translation modulators 4E-BP1 and ribosomal protein S6 through the PI3K-mTOR pathways. Indeed, human neuroblastoma cells after trophic deprivation showed a strong induction of ATXN2 transcript via mTOR inhibition. Our results support the notion that ataxin-2 is a nutritional stress-inducible modulator of mRNA translation at the pre-initiation complex.
Identifiersdoi: 10.1016/j.bbadis.2016.05.017
issn: 0925-4439
Appears in Collections:(IIBM) Artículos
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