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The two-hit theory hits 50.

Jonathan Chernoff1

  • 1Fox Chase Cancer Center, Philadelphia, PA 19111.

Molecular Biology of the Cell
|November 4, 2021
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This summary is machine-generated.

The influential "two-hit" theory explains how mutations in tumor suppressor genes cause cancer. This foundational concept in cancer genetics, proposed in 1971, describes how two gene mutations are needed for tumor development.

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Area of Science:

  • Oncology
  • Cancer Genetics
  • Molecular Biology

Background:

  • The "two-hit" theory, proposed by Al Knudson in 1971, revolutionized cancer genetics.
  • It explains the genetic basis of tumor suppressor genes and their role in cancer development.
  • This theory addresses both heritable and spontaneous forms of cancer.

Purpose of the Study:

  • To discuss the foundational "two-hit" theory of tumor suppressor genes.
  • To explain the mechanism by which two mutations in tumor suppressor genes lead to cancer.
  • To highlight the predictive power of the theory regarding gene discovery.

Main Methods:

  • Theoretical discussion based on observations of retinoblastoma.
  • Postulation of a genetic model involving two inactivating mutations.
  • Analysis of heritable versus spontaneous cancer development.

Main Results:

  • Proposed that tumors arise from two inactivating mutations in tumor suppressor genes.
  • Explained how germ-line mutations in heritable cancers differ from somatic mutations in spontaneous cancers.
  • Predicted the existence and properties of the retinoblastoma tumor suppressor gene 15 years before its cloning.

Conclusions:

  • The "two-hit" theory provides a fundamental framework for understanding cancer genetics.
  • It unifies the understanding of heritable and spontaneous tumor formation.
  • Knudson's theory demonstrated the power of genetic hypotheses in guiding experimental research.