[When translation arises from its TORpor]

Olivier Le Bacquer1, Yvan Martineau, Yaël Mamane

  • 1Laboratoire du Dr Nahum Sonenberg, Département de Biochimie, Université McGill, 3655, Promenade Sir-William-Osler, Montréal (Québec), H3G 1Y6 Canada.

Medecine Sciences : M/S
|May 12, 2006
PubMed

Insights

Gene regulation impacts cellular balance, with disruptions linked to cancer, obesity, and diabetes. The PI3K/Akt/mTOR pathway and rapamycin show promise for novel therapeutic strategies.

Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Medical Science

Background:

  • Gene regulation via transcriptional and post-translational mechanisms is crucial for cellular homeostasis.
  • Deregulation of gene expression is a known factor in diseases like cancer, obesity, and diabetes.
  • The PI3K/Akt/mTOR pathway's role in translation initiation has been increasingly recognized in disease development.

Purpose of the Study:

  • To review the role of gene regulation, particularly translation initiation via the PI3K/Akt/mTOR pathway, in cellular homeostasis and disease.
  • To highlight the therapeutic potential of rapamycin, an mTOR inhibitor, in various pathologies.

Main Methods:

  • Literature review focusing on gene regulation mechanisms.
  • Analysis of studies investigating the PI3K/Akt/mTOR pathway.
  • Examination of research on rapamycin's effects in cancer, obesity, and diabetes.

Main Results:

  • Transcriptional deregulation is implicated in major diseases.
  • The PI3K/Akt/mTOR pathway significantly controls translation initiation.
  • Rapamycin exhibits anti-proliferative effects in cancer and potential benefits in obesity and diabetes.

Conclusions:

  • Rapamycin and its analogs represent a promising therapeutic avenue.
  • Targeting the PI3K/Akt/mTOR pathway offers potential for novel treatment strategies.
  • Further development of rapamycin-based therapies is warranted for diverse diseases.

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Initiation of Translation02:33

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
Termination of Translation01:44

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...