Related Experiment Video

Updated: Aug 6, 2026

Induction and Diagnosis of Tumors in Drosophila Imaginal Disc Epithelia
08:14

Induction and Diagnosis of Tumors in Drosophila Imaginal Disc Epithelia

Published on: July 25, 2017

Regulation of imaginal disc growth by tumor-suppressor genes in Drosophila

Iswar K Hariharan1, David Bilder

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, California 94720, USA. ikh@berkeley.edu

Annual Review of Genetics
|July 29, 2006
PubMed

Insights

Mutations in Drosophila tumor-suppressor genes cause tissue overgrowth by affecting cell proliferation and growth timing. Understanding these gene classes aids in comprehending development and cancer.

Area of Science:

  • Developmental Biology
  • Genetics
  • Cell Biology

Background:

  • Inactivating mutations in tumor-suppressor genes in Drosophila lead to uncontrolled tissue overgrowth.
  • This overgrowth results from either accelerated cell proliferation or prolonged growth periods.
  • Three distinct classes of tumor-suppressor genes regulate imaginal disc epithelium growth.

Purpose of the Study:

  • To categorize tumor-suppressor genes based on their effects on tissue growth.
  • To elucidate the mechanisms by which different classes of tumor-suppressor genes induce overgrowth.
  • To understand the interactions between these gene classes for insights into development and cancer.

Main Methods:

  • Classification of tumor-suppressor genes into hyperplastic, neoplastic, and nonautonomous groups based on mutation phenotypes.
  • Analysis of gene functions, including cell proliferation regulation, cell-cell junction scaffolding, and endocytic pathways.
  • Investigating the impact of mutations on tissue architecture and cell-cell communication.

Main Results:

  • Hyperplastic tumor-suppressor genes (e.g., pten, Tsc1/2, hippo pathway) increase cell proliferation without disrupting tissue architecture.
  • Neoplastic tumor-suppressor genes affect cell-cell junction proteins (e.g., scribble, discs large, lgl) or endocytic pathways (e.g., avalanche, rab5, ESCRT).
  • Nonautonomous tumor-suppressor genes stimulate proliferation in adjacent wild-type cells.

Conclusions:

  • Understanding the distinct roles and interactions of these tumor-suppressor gene classes is crucial.
  • This knowledge advances our comprehension of coordinated cell and tissue growth during development.
  • Insights gained are relevant to understanding and potentially treating cancer and other diseases.

More Related Videos

The Drosophila Imaginal Disc Tumor Model: Visualization and Quantification of Gene Expression and Tumor Invasiveness Using Genetic Mosaics10:31

The Drosophila Imaginal Disc Tumor Model: Visualization and Quantification of Gene Expression and Tumor Invasiveness Using Genetic Mosaics

Published on: October 6, 2016

Dissection and Immunostaining of Imaginal Discs from Drosophila melanogaster10:10

Dissection and Immunostaining of Imaginal Discs from Drosophila melanogaster

Published on: September 20, 2014

Related Concept Videos

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

Tumor suppressor genes are normal genes that can slow down cell division, repair DNA mistakes, or program the cells for apoptosis in case of irreparable damage. Hence, they play an essential role in preventing the proliferation of damaged cells.
When the tumor suppressor genes develop mutations or are lost, cells start growing out of control, leading to cancer. However, a single functional copy of the tumor suppressor gene is enough for the cells to maintain their normal functions and cell...
Cancer-Critical Genes II: Tumor Suppressor Genes01:05

Cancer-Critical Genes II: Tumor Suppressor Genes

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.
When the function of certain critical genes, especially those involved in cell cycle regulation and cell growth signaling cascades, gets disrupted, it upsets the cell cycle progression. Such cells with unchecked cell cycles start proliferating uncontrollably and eventually develop into tumors.
Such genes that act...
Negative Regulator Molecules01:23

Negative Regulator Molecules

Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
Inhibition of Cdk Activity02:34

Inhibition of Cdk Activity

The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
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...