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Wild-type and gaf1 mutant cells treated with Torin1 or with a combination of caffeine/rapamycin

ABSTRACT: Target of Rapamycin Complex 1 (TORC1) signaling promotes growth and ageing. Inhibition of TORC1 leads to a down-regulation of factors that stimulate protein translation, which in turn contributes to longevity. TORC1-dependent post-transcriptional regulation of protein translation has been well studied, while analogous transcriptional regulation is less understood. Here we screened fission yeast deletion mutants for resistance to Torin1, which inhibits TORC1 and cell growth. Cells lacking the GATA transcription factor Gaf1 (gaf1Δ) grew normally even in high doses of Torin1. The gaf1Δ mutation shortened the chronological lifespan of non-dividing cells and diminished the longevity triggered by Torin1 treatment. Expression profiling and genome-wide binding experiments showed that, upon TORC1 inhibition, Gaf1 directly up-regulated genes for small-molecule metabolic pathways and indirectly repressed genes for protein translation. Surprisingly, Gaf1 bound to, and down-regulated the tRNA genes, so also functions as a transcription factor for genes transcribed by RNA polymerase III. Thus, Gaf1 controls the transcription of both coding and tRNA genes to inhibit translation and growth downstream of TORC1.

ORGANISM(S): Schizosaccharomyces pombe

SUBMITTER: Charalampos Rallis

PROVIDER: E-MTAB-8569 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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