Research ArticleMOLECULAR BIOLOGY

Translational control by lysine-encoding A-rich sequences

Science Advances  24 Jul 2015:
Vol. 1, no. 6, e1500154
DOI: 10.1126/sciadv.1500154

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Abstract

Regulation of gene expression involves a wide array of cellular mechanisms that control the abundance of the RNA or protein products of that gene. We describe a gene regulatory mechanism that is based on polyadenylate [poly(A)] tracks that stall the translation apparatus. We show that creating longer or shorter runs of adenosine nucleotides, without changes in the amino acid sequence, alters the protein output and the stability of mRNA. Sometimes, these changes result in the production of an alternative “frameshifted” protein product. These observations are corroborated using reporter constructs and in the context of recombinant gene sequences. About 2% of genes in the human genome may be subject to this uncharacterized yet fundamental form of gene regulation. The potential pool of regulated genes encodes many proteins involved in nucleic acid binding. We hypothesize that the genes we identify are part of a large network whose expression is fine-tuned by poly(A) tracks, and we provide a mechanism through which synonymous mutations may influence gene expression in pathological states.

Keywords
  • gene regulation
  • mRNA
  • polybasic amino acid runs
  • poly(A) nucleotide tracks
  • lysine
  • ribosome stalling
  • synonymous mutations

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.

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