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Regulation of Expression Occurs at Multiple Steps02:24

Regulation of Expression Occurs at Multiple Steps

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Gene expression can be regulated at almost every step from gene to protein. Transcription is the step that is most commonly regulated. This involves the binding of proteins to short regulatory sequences on the DNA. This association can either promote or inhibit the transcription of a gene associated with the respective sequence.
Transcription results in the generation of precursor (pre-mRNA) that consists of both exons and introns, which needs further processing before being translated to a...
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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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Gene expression in prokaryotes is governed by constitutive and regulated systems, allowing cells to balance the production of essential proteins with adaptive responses to environmental changes.Constitutive Gene ExpressionConstitutive, or housekeeping, genes are continuously expressed as they encode proteins vital for fundamental cellular processes. These include enzymes for glycolysis, ribosomal components for protein synthesis, and proteins involved in DNA replication. Their constant...
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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Isolation of Murine Peritoneal Macrophages to Carry Out Gene Expression Analysis Upon Toll-like Receptors Stimulation
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Regulators of hepcidin expression.

Marie-Paule Roth1, Delphine Meynard1, Hélène Coppin1

  • 1Institut de Recherche en Santé Digestive (IRSD), Université de Toulouse, INSERM, INRA, ENVT, UPS, Toulouse, France.

Vitamins and Hormones
|February 26, 2019
PubMed
Summary
This summary is machine-generated.

Hepcidin, a liver hormone, regulates iron absorption and release. Its dysregulation causes iron overload or anemia, highlighting its critical role in iron homeostasis.

Keywords:
ErythropoiesisHepcidinHypoxiaInflammationIronTestosterone

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Area of Science:

  • Biochemistry
  • Physiology
  • Molecular Biology

Background:

  • Iron is essential but toxic in excess.
  • The body lacks an iron excretion mechanism, necessitating strict absorption regulation.
  • Hepcidin is the key hepatic hormone controlling systemic iron levels.

Purpose of the Study:

  • To review the molecular mechanisms and signaling pathways regulating hepcidin.
  • To understand hepcidin's role in iron homeostasis and related disorders.
  • To identify areas needing further research in hepcidin regulation.

Main Methods:

  • Review of existing literature on hepcidin regulation.
  • Analysis of signaling pathways influenced by iron, inflammation, hypoxia, and erythropoiesis.
  • Examination of hepcidin's interaction with ferroportin.

Main Results:

  • Hepcidin regulates iron absorption and release by targeting ferroportin.
  • Hepcidin production is influenced by iron levels, inflammation, hypoxia, and erythropoiesis.
  • Hepcidin deficiency leads to iron overload; overproduction causes iron-restricted anemias.

Conclusions:

  • Hepcidin is central to iron homeostasis.
  • Dysregulation of hepcidin underlies various iron disorders.
  • Further research is needed to clarify complex regulatory mechanisms.