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ATP Synthase: Mechanism01:48

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In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Beyond Mutations: Additional Mechanisms and Implications of SWI/SNF Complex Inactivation.

Stefanie B Marquez1, Kenneth W Thompson1, Li Lu2

  • 1Department of Medicine, Division of Hematology/Oncology, University of Florida , Gainesville, FL , USA.

Frontiers in Oncology
|March 17, 2015
PubMed
Summary
This summary is machine-generated.

The SWI/SNF complex regulates gene expression and is crucial for preventing cancer. Mutations and non-mutational mechanisms inactivate SWI/SNF subunits, offering potential therapeutic targets.

Keywords:
BrahmaSMARCA2SMARCA4chromatin remodelingepigenetic BRG1

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Area of Science:

  • Molecular Biology
  • Cancer Biology
  • Epigenetics

Background:

  • The SWI/SNF complex is a key regulator of gene expression, influencing DNA accessibility for transcription factors.
  • It plays a critical role in diverse cellular processes, including DNA repair, differentiation, and growth control, making it vital in cancer prevention.
  • Alterations in SWI/SNF subunits are implicated in cancer development, highlighting the complex's significance in oncogenesis.

Purpose of the Study:

  • To review the mechanisms of SWI/SNF subunit inactivation in cancer, focusing on mutations versus non-mutational silencing.
  • To explore the role of epigenetic modifications in SWI/SNF subunit loss.
  • To discuss the therapeutic potential of targeting SWI/SNF, including synthetic lethality and the clinical utility of BRM polymorphisms.

Main Methods:

  • Literature review of Next-Generation sequencing studies.
  • Analysis of mutation frequencies versus subunit loss in various tumor types.
  • Exploration of epigenetic regulatory mechanisms affecting SWI/SNF subunits.
  • Review of synthetic lethality approaches and biomarker development.

Main Results:

  • Mutations in SWI/SNF subunits are common across many cancer types.
  • Subunit loss often exceeds mutation frequency, suggesting significant roles for non-mutational inactivation mechanisms.
  • Epigenetic silencing is a likely contributor to SWI/SNF subunit loss, particularly for BRM.
  • BRM polymorphisms are emerging as potential clinical biomarkers for cancer risk.

Conclusions:

  • Non-mutational mechanisms, likely epigenetic, are critical for SWI/SNF subunit inactivation in cancer.
  • The reversibility of epigenetic silencing presents a promising avenue for targeted cancer therapies.
  • Understanding these inactivation pathways is essential for developing novel therapeutic strategies against SWI/SNF-associated cancers.