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Abnormal Proliferation02:23

Abnormal Proliferation

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 daughter...
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Yeast As a Chassis for Developing Functional Assays to Study Human P53
14:57

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Published on: August 4, 2019

p53 actions on microRNA expression and maturation pathway.

Hiroshi I Suzuki1, Kohei Miyazono

  • 1Department of Molecular Pathology, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.

Methods in Molecular Biology (Clifton, N.J.)
|November 15, 2012
PubMed
Summary

The tumor suppressor p53 protein aids microRNA (miRNA) production by interacting with Drosha, crucial for miRNA biogenesis. Cancer-associated p53 mutations impair this miRNA processing, impacting cellular pathways.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Genetics

Background:

  • The tumor suppressor p53 is a key regulator of cellular responses to stress, acting as a transcription factor.
  • p53 also exhibits transcription-independent functions in the nucleus and cytoplasm.
  • Emerging evidence highlights interactions between p53 and microRNA (miRNA) pathways.

Purpose of the Study:

  • To investigate the role of p53 in miRNA biogenesis.
  • To elucidate the mechanism by which p53 influences miRNA processing.
  • To evaluate the impact of cancer-derived p53 mutants on miRNA maturation.

Main Methods:

  • Assessing p53's effect on miRNA expression levels.
  • Analyzing the interaction between pri-miRNA and the Drosha complex.
  • Measuring the processing activity of the Drosha complex on pri-miRNA.

Main Results:

  • p53 promotes the processing of primary miRNA transcripts by associating with Drosha under DNA damage conditions.
  • Wild-type p53 enhances miRNA maturation.
  • Cancer-derived p53 mutants show reduced ability to promote miRNA maturation, attenuating miRNA processing.

Conclusions:

  • p53 plays a novel role in regulating miRNA biogenesis through its interaction with Drosha.
  • Dysregulation of p53 affects miRNA processing, suggesting a link between p53 status and miRNA expression in cancer.
  • These findings reveal complex crosstalk between p53 signaling and miRNA biogenesis pathways.