Upregulation of 5'-terminal oligopyrimidine mRNA translation upon loss of the ARF tumor suppressor

Sci Rep. 2020 Dec 17;10(1):22276. doi: 10.1038/s41598-020-79379-8.

Abstract

Tumor cells require nominal increases in protein synthesis in order to maintain high proliferation rates. As such, tumor cells must acquire enhanced ribosome production. How the numerous mutations in tumor cells ultimately achieve this aberrant production is largely unknown. The gene encoding ARF is the most commonly deleted gene in human cancer. ARF plays a significant role in regulating ribosomal RNA synthesis and processing, ribosome export into the cytoplasm, and global protein synthesis. Utilizing ribosome profiling, we show that ARF is a major suppressor of 5'-terminal oligopyrimidine mRNA translation. Genes with increased translational efficiency following loss of ARF include many ribosomal proteins and translation factors. Knockout of p53 largely phenocopies ARF loss, with increased protein synthesis and expression of 5'-TOP encoded proteins. The 5'-TOP regulators eIF4G1 and LARP1 are upregulated in Arf- and p53-null cells.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • ADP-Ribosylation Factor 1 / genetics*
  • Autoantigens / genetics
  • Cell Proliferation / genetics
  • Eukaryotic Initiation Factor-4G / genetics
  • Humans
  • Neoplasms / genetics*
  • Neoplasms / pathology
  • Protein Biosynthesis / genetics
  • Ribonucleoproteins / genetics
  • Ribosomal Proteins / biosynthesis
  • Ribosomal Proteins / genetics*
  • Ribosomes / genetics
  • SS-B Antigen
  • Transcriptional Activation / genetics
  • Tumor Suppressor Protein p53 / genetics*

Substances

  • Autoantigens
  • EIF4G1 protein, human
  • Eukaryotic Initiation Factor-4G
  • Ribonucleoproteins
  • Ribosomal Proteins
  • TP53 protein, human
  • Tumor Suppressor Protein p53
  • ADP-Ribosylation Factor 1