p62/SQSTM1 Fuels Melanoma Progression by Opposing mRNA Decay of a Selective Set of Pro-metastatic Factors.

Affiliation

Hospital Universitario 12 de Octubre, Instituto Investigación i+12, Medical School, Universidad Complutense, Madrid, Spain. Electronic address: [Email]

Abstract

Modulators of mRNA stability are not well understood in melanoma, an aggressive tumor with complex changes in the transcriptome. Here we report the ability of p62/SQSTM1 to extend mRNA half-life of a spectrum of pro-metastatic factors. These include FERMT2 and other transcripts with no previous links to melanoma. Transcriptomic, proteomic, and interactomic analyses, combined with validation in clinical biopsies and mouse models, identified a selected set of RNA-binding proteins (RBPs) recruited by p62, with IGF2BP1 as a key partner. This p62-RBP interaction distinguishes melanoma from other tumors where p62 controls autophagy or oxidative stress. The relevance of these data is emphasized by follow-up analyses of patient prognosis revealing p62 and FERMT2 as adverse determinants of disease-free survival.

Keywords

FERMT2,IGF2BP1,RNA-binding proteins,gene networks,genetically engineered mouse models,interactomics,melanoma,metastasis,p62/SQSTM1,prognostic indicators,proteomics,transcriptomics,