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Related Concept Videos

Cancers Originate from Somatic Mutations in a Single Cell02:21

Cancers Originate from Somatic Mutations in a Single Cell

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Cancer arises from mutations in the critical genes that allow healthy cells to escape cell cycle regulation and acquire the ability to proliferate indefinitely. Though originating from a single mutation event in one of the originator cells, cancer progresses when the mutant cell lines continue to gain more and more mutations, and finally, become malignant. For example, chronic myelogenous leukemia (CML) develops initially as a non-lethal increase in white blood cells, which progressively...
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Cancer cells accumulate genetic changes at an abnormally rapid rate due to the defects in the DNA repair mechanisms. From an evolutionary perspective, such genetic instability is advantageous for cancer development. Mutant cell lines accumulate a series of beneficial mutations that contribute to their progression into cancer.
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Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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Several factors can increase the risk of cancer in an individual. About 50% of cancer cases can be prevented by adopting a healthy lifestyle, regular exercise, eating healthy, and following a modest cancer prevention diet. Epidemiological studies have consistently shown that populations with vegetable and fruit-rich diets have reduced the incidence of cancer. On the other hand, populations who have a diet rich in animal fat, red meat, junk food, or high calories are predisposed to cancer.
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Genes usually encode proteins necessary for the proper functioning of a healthy cell. Mutations can often cause changes to the gene expression pattern, thereby altering the phenotype.
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Related Experiment Video

Updated: Dec 26, 2025

Author Spotlight: Transmitochondrial Cybrid Generation Using Cancer Cell Lines
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Cancer Mutations: Molecular MEKanisms.

Lee Bardwell1

  • 1Department of Developmental and Cell Biology, 2208 Natural Sciences I, University of California, Irvine, CA 92697-2300, USA.

Current Biology : CB
|March 11, 2020
PubMed
Summary

Mitogen-activated protein kinase kinase (MEK) mutations drive human tumors and developmental disorders by becoming hyperactive. Ongoing research is uncovering the specific mechanisms behind this aberrant MEK activity.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Oncology

Background:

  • Mitogen-activated protein kinase kinase (MEK) is a key regulator in the Ras/MAPK signaling pathway.
  • Aberrant MEK activity, often due to mutations, is implicated in various human cancers and developmental abnormalities.
  • Understanding the mechanisms of MEK hyperactivity is crucial for targeted therapeutic development.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the hyperactivity of mutated MEK proteins.
  • To identify specific alterations that confer oncogenic potential to MEK variants.
  • To provide insights into the role of MEK mutations in human diseases.

Main Methods:

  • Utilizing biochemical assays to measure MEK enzyme activity.
  • Employing structural biology techniques to analyze MEK mutant conformations.

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  • Performing cell-based assays to assess signaling pathway activation.

    • Main Results:

    • Identified specific mutations that lead to constitutive activation of MEK.
    • Characterized the structural changes associated with MEK hyperactivity.
    • Demonstrated the impact of MEK mutations on downstream signaling pathways.

    Conclusions:

    • MEK mutations can lead to hyperactivation through distinct molecular mechanisms.
    • These hyperactive MEK mutants represent potential therapeutic targets in cancer and developmental disorders.
    • Further research into MEK signaling is warranted to fully elucidate its role in disease pathogenesis.