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Cell Specific Gene Expression01:58

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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Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
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Stem cells are undifferentiated cells that divide and produce different cell types. Ordinarily, cells that have differentiated into a specific cell type are terminally differentiated; however, scientists have found a way to reprogram these mature cells so that they dedifferentiate and return to an unspecialized, proliferative state. These cells are pluripotent like embryonic stem cells—able to produce all cell types—and are called induced pluripotent stem cells (iPSCs).
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Regulation of Expression at Multiple Steps01:23

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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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Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
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Related Experiment Video

Updated: May 6, 2026

Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene
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Focus Formation: A Cell-based Assay to Determine the Oncogenic Potential of a Gene

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Cellular MYCro economics: Balancing MYC function with MYC expression.

David Levens1

  • 1Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892-1500.

Cold Spring Harbor Perspectives in Medicine
|November 5, 2013
PubMed
Summary

The MYC oncoprotein influences cell processes like growth and metabolism. Understanding MYC

Area of Science:

  • Molecular Biology
  • Cellular Processes
  • Gene Regulation

Background:

  • The MYC oncoprotein is a key regulator of fundamental cellular processes.
  • MYC's role in proliferation, growth, apoptosis, differentiation, and metabolism is well-established.
  • Quantitative understanding of MYC's regulatory network is crucial.

Purpose of the Study:

  • To quantitatively define the relationship between MYC input and target gene expression output.
  • To explore higher-order network relationships influenced by MYC expression levels.
  • To investigate MYC's function from both microeconomic and macroeconomic perspectives.

Main Methods:

  • Analysis of MYC's role as a molecular manager at individual promoters.
  • Examination of MYC as a global regulator of active genes.

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  • Investigating the diverse mechanisms MYC employs to tune gene expression.

    • Main Results:

    • MYC acts as a microeconomic manager, orchestrating promoter-specific responses with transcription factors and chromatin modifiers.
    • MYC functions as a macroeconomic czar, imposing overarching rules on all active genes.
    • c-myc promoter output is dependent on multiple inputs and diverse regulatory mechanisms.

    Conclusions:

    • MYC's expression tuning is critical for maintaining cellular homeostasis.
    • Deviations from appropriate MYC expression levels are linked to disease states.
    • A comprehensive understanding of MYC's regulatory network is essential for deciphering health and disease thresholds.