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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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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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An Optimized Protocol for Electrophoretic Mobility Shift Assay Using Infrared Fluorescent Dye-labeled Oligonucleotides
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Sox2 function as a negative regulator to control HAMP expression.

Bin Song1, Qi Bian2, Cheng-Hao Shao3

  • 1Department of General Surgery, Changhai Hospital, Second Military Medical University, Shanghai, 200433, China. smmusb@126.com.

Biological Research
|May 7, 2015
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Summary

Sox2 protein suppresses hepcidin (HAMP) gene expression by binding to its promoter. This discovery offers a potential therapeutic strategy for HAMP-overexpression-related diseases, such as iron deficiency anemia.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Iron Metabolism

Background:

  • Hepcidin, encoded by the HAMP gene, is a key regulator of iron metabolism.
  • Dysregulated HAMP expression leads to iron metabolism disorders.

Purpose of the Study:

  • To elucidate the regulatory mechanisms controlling HAMP gene expression.
  • To investigate the role of Sox2 in HAMP gene regulation.

Main Methods:

  • Luciferase reporter assays to assess promoter activity.
  • Chromatin immunoprecipitation (ChIP) to identify Sox2 binding sites.
  • Sox2 knockdown and overexpression experiments in human primary hepatocytes.

Main Results:

  • Sox2 overexpression decreased basal HAMP expression and expression induced by IL-6 or BMP-2.
  • Sox2 knockdown increased HAMP expression.
  • Two functional Sox2-binding sites were identified in the HAMP promoter.
  • Sox2 directly binds to the HAMP promoter and negatively regulates its activity.
  • Sox2 was confirmed to negatively regulate HAMP expression in human primary hepatocytes.

Conclusions:

  • Sox2 acts as a novel transcriptional repressor of the HAMP gene.
  • Sox2 binds to the HAMP promoter, inhibiting its activity.
  • Targeting Sox2-HAMP interactions may offer therapeutic benefits for HAMP-overexpression-related diseases, including iron deficiency anemia.