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Related Concept Videos

Hedgehog Signaling Pathway02:33

Hedgehog Signaling Pathway

The Hedgehog gene (Hh) was first discovered due to its control of the growth of disorganized, hair-like bristles phenotype in Drosophila, much like hedgehog spines. Hh plays a crucial role in the development of organs and the maintenance of homeostasis in both invertebrates and vertebrates. However, while Drosophila has only one Hh protein, mammals have multiple functional Hedgehog proteins - Sonic (Shh), Desert (Dhh), and Indian Hedgehog (Ihh). All of these homologous proteins have adapted to...
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...
Loss of Tumor Suppressor Gene Functions01:12

Loss of Tumor Suppressor Gene Functions

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Epigenetic Regulation01:37

Epigenetic Regulation

Epigenetic changes alter the physical structure of the DNA without changing the genetic sequence and often regulate whether genes are turned on or off. This regulation ensures that each cell produces only proteins necessary for its function. For example, proteins that promote bone growth are not produced in muscle cells. Epigenetic mechanisms play an essential role in healthy development. Conversely, precisely regulated epigenetic mechanisms are disrupted in diseases like cancer.
X-chromosome...
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
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Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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Related Experiment Video

Updated: Jul 6, 2026

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

Yeast As a Chassis for Developing Functional Assays to Study Human P53

Published on: August 4, 2019

Compromised HOXA5 function can limit p53 expression in human breast tumours.

V Raman1, S A Martensen, D Reisman

  • 1Breast Cancer Program, Johns Hopkins Oncology Center, Baltimore, Maryland 21231, USA.

Nature
|July 6, 2000
PubMed
Summary

Loss of p53 gene expression in breast tumors is linked to reduced HOXA5. This suggests HOXA5 deficiency may cause p53 loss, impacting cancer development.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The p53 gene is crucial for preventing malignant transformation.
  • Regulation of p53 synthesis, unlike its degradation, is poorly understood.
  • Reduced p53 messenger RNA (mRNA) levels are observed in many breast tumors.

Purpose of the Study:

  • To identify factors regulating p53 transcription.
  • To investigate the role of HOX genes in p53 regulation.
  • To explore the relationship between HOXA5 and p53 expression in breast cancer.

Main Methods:

  • Analysis of p53 promoter for HOX binding sites.
  • Transient transfection assays using Hox/HOXA5.
  • Assessing apoptosis in cancer cells with varying p53 and HOXA5 expression.
  • Quantification of p53 and HOXA5 mRNA and protein in cell lines and patient tumors.
  • Methylation analysis of the HOXA5 promoter region.

Main Results:

  • Consensus HOX binding sites were identified in the p53 promoter.
  • Hox/HOXA5 transfection activated the p53 promoter.
  • HOXA5 expression induced apoptosis in p53-positive cancer cells but not in p53-deficient cells.
  • Breast cancer cell lines and patient tumors showed coordinated loss of p53 and HOXA5.
  • HOXA5 promoter methylation was frequent in p53-negative tumors.

Conclusions:

  • Loss of p53 expression in human breast cancer may stem from reduced HOXA5 expression.
  • HOXA5 acts as a regulator of p53 transcription.
  • Aberrant HOXA5 expression and promoter methylation contribute to p53 deficiency in breast cancer.