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Related Concept Videos

Constitutive and Regulated Gene Expression01:27

Constitutive and Regulated Gene Expression

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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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What is Gene Expression?01:42

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Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
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A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is comprised  of nucleotides and proteins are comprised of amino acids, a mediator is required to convert the information encoded in DNA into proteins. This mediator is the messenger RNA (mRNA). mRNA copies the blueprint from DNA by a process called transcription. In eukaryotes, transcription occurs in the nucleus by complementary base-pairing with the DNA template. The mRNA is then...
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Regulation of Expression Occurs at Multiple Steps02:24

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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.
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Cell Specific Gene Expression

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Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
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Chromatin is the massive complex of DNA and proteins packaged inside the nucleus. The complexity of chromatin folding and how it is packaged inside the nucleus greatly influences  access to genetic information. Generally, the nucleus' periphery is considered transcriptionally repressive, while the cell's interior is considered a transcriptionally active area. 
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Using an Automated Cell Counter to Simplify Gene Expression Studies: siRNA Knockdown of IL-4 Dependent Gene Expression in Namalwa Cells
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Zyxin: a mechanotransductor to regulate gene expression.

Y-X Wang1, D-Y Wang, Y-C Guo

  • 1Academy of Medicine and Life Sciences, Nanjing University of Chinese Medicine, Nanjing, China. Guoj@njucm.edu.cn.

European Review for Medical and Pharmacological Sciences
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Zyxin, a key mechanotransducer, regulates gene expression by sensing mechanical signals at focal adhesions and translocating to the nucleus. Its dysregulation is linked to diseases like cancer, making it a potential diagnostic and therapeutic target.

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Area of Science:

  • Cellular Mechanobiology
  • Molecular Cell Biology
  • Biochemistry

Background:

  • Cells respond to environmental signals, including mechanical forces, which influence their behavior.
  • Focal adhesions (FAs) are critical structures for transmitting mechanical signals within cells.
  • Zyxin, a LIM domain protein, is primarily found in FAs and is implicated as a mechanotransducer.

Purpose of the Study:

  • To review the characteristics of zyxin.
  • To elucidate the molecular mechanisms by which zyxin participates in cellular activities.
  • To highlight zyxin's role in mechanotransduction and gene regulation.

Main Methods:

  • Comprehensive literature search of MEDLINE and Embase databases.
  • Review of bibliographies from identified publications.
  • Inclusion of references from selected papers for data sourcing.

Main Results:

  • Zyxin promotes actin polymerization via Ena/VASP proteins under mechanical tension, aiding stress fiber remodeling.
  • Zyxin translocates to the nucleus upon mechanical stretch, regulating gene transcription through interactions with factors like NMP4.
  • Aberrant nuclear functions of zyxin are associated with diseases, including prostate and non-small-cell lung cancer.

Conclusions:

  • Zyxin is essential for cellular mechanotransduction and modulates gene expression.
  • Zyxin's clinical relevance positions it as a potential target for disease diagnosis and treatment.
  • Further biomechanics research on zyxin's force-sensing and gene-regulating roles can yield diagnostic and therapeutic advancements.