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What is Gene Expression?

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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.
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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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Chromatin Position Affects Gene Expression02:35

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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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Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
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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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Related Experiment Video

Updated: Feb 18, 2026

Using Mycobacterium smegmatis as a Bioindicator for Zinc-Limited Growth Conditions in Mycobacteria
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A role for zinc in gene expression.

B L Vallee

    Journal of Inherited Metabolic Disease
    |January 1, 1983
    PubMed
    Summary

    Zinc deficiency impacts Euglena gracilis growth and cell division, suggesting zinc

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Cell Biology

    Background:

    • Zinc is an essential trace element crucial for numerous biological processes.
    • Previous studies indicate zinc's importance in cellular functions.

    Purpose of the Study:

    • To investigate the effects of zinc deficiency on the unicellular alga Euglena gracilis.
    • To explore the potential role of zinc in gene regulation within Euglena gracilis.

    Main Methods:

    • Culturing Euglena gracilis under controlled zinc-deficient conditions.
    • Observing and quantifying changes in growth, morphology, cell cycle, and mitosis.

    Main Results:

    • Zinc deficiency significantly altered growth and morphology in Euglena gracilis.

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  • Cell cycle progression and mitosis were notably affected by the lack of zinc.
  • These effects suggest a critical role for zinc in regulating gene expression.

    • Conclusions:

    • Zinc plays a vital role in regulating gene expression in Euglena gracilis, likely via zinc-dependent enzymes.
    • The findings suggest potential parallels in human biology, with implications for genetic and medical research.