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The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the...
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The Translational Regulation in mTOR Pathway.

Miaomiao Yang1, Yanming Lu1, Weilan Piao1

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The mechanistic/mammalian target of rapamycin (mTOR) pathway controls cell growth and protein synthesis by regulating mRNA translation. Understanding mTOR

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Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Biochemistry

Background:

  • The mechanistic/mammalian target of rapamycin (mTOR) is a central regulator of cell growth and proliferation.
  • mTOR integrates signals from nutrients, growth factors, and energy status to control cellular metabolism.
  • Protein synthesis is a key energy-consuming process tightly regulated by mTOR signaling.

Purpose of the Study:

  • To review the mTOR pathway and its role in mRNA translational regulation.
  • To elucidate the mechanisms of mTOR-mediated general and preferential mRNA translation.
  • To highlight the involvement of key regulators like 4E-BP and S6K in mTOR signaling.

Main Methods:

  • Literature review of mTOR signaling pathways.
  • Analysis of molecular mechanisms governing mRNA translation.
  • Summary of recent research on mTOR-mediated translational control.

Main Results:

  • mTOR signaling orchestrates fundamental cellular processes including protein synthesis, autophagy, and cell growth.
  • Translational regulation by mTOR involves key factors such as 4E-binding protein (4E-BP) and S6 kinase (S6K).
  • mTOR exhibits selectivity, preferentially regulating specific mRNA translations, with contributions from 4E-BP and LARP1.

Conclusions:

  • Comprehensive understanding of the mTOR pathway is crucial for deciphering cellular responses to environmental cues.
  • mTOR-mediated translational control is vital for maintaining cellular homeostasis.
  • Targeting the mTOR pathway holds therapeutic potential for diseases like cancer, diabetes, and neurodegeneration.