Related Experiment Video

Updated: May 3, 2026

Cell Cycle Analysis in the C. elegans Germline with the Thymidine Analog EdU
06:58

Cell Cycle Analysis in the C. elegans Germline with the Thymidine Analog EdU

Published on: October 22, 2018

10.9K

MDL-1, a growth- and tumor-suppressor, slows aging and prevents germline hyperplasia and hypertrophy in C. elegans

Michèle Riesen1, Inna Feyst, Nattaphong Rattanavirotkul

  • 1Institute of Healthy Ageing, and Research Department of Genetics, Evolution and Environment, University College London, London, United Kingdom.

Aging
|February 18, 2014
PubMed

Insights

The transcription factor MDL-1 (Mad basic helix-loop-helix leucine zipper) normally inhibits cell proliferation and growth. In C. elegans, MDL-1 slows the progression of age-related uterine tumors and influences lifespan.

Area of Science:

  • Genetics
  • Molecular Biology
  • Aging Research

Background:

  • The daf-2 insulin/IGF-1 receptor pathway in C. elegans is linked to increased lifespan.
  • MDL-1, a transcription factor, is upregulated in daf-2 mutants with extended longevity.

Purpose of the Study:

  • To investigate the role of MDL-1 in C. elegans germline proliferation and aging.
  • To understand how MDL-1 interacts with the daf-2 pathway in lifespan regulation.

Main Methods:

  • Utilized the mdl-1 deletion allele mdl-1(tm311) in C. elegans.
  • Observed lifespan, oocyte production, and uterine tumor development in wild-type, mdl-1, and daf-2 mutant strains.
  • Performed intestine-limited rescue experiments for mdl-1.

Main Results:

  • mdl-1 deletion shortened lifespan, particularly in daf-2 mutants, indicating MDL-1 contributes to daf-2's lifespan effects.
  • mdl-1 mutants exhibited increased unfertilized oocytes and accelerated uterine tumor development during aging.
  • In contrast, daf-2 mutants showed hypoplastic germlines, while mdl-1 and daf-2 double mutants displayed hyperplastic germlines.
  • Intestine-specific mdl-1 rescue partially increased lifespan.

Conclusions:

  • MDL-1 acts as an inhibitor of cell proliferation and growth, slowing age-related uterine tumor progression in C. elegans.
  • MDL-1 influences age-related mortality through functions in both the intestine and the germline.
  • MDL-1 plays a complex role in the daf-2 longevity pathway.

More Related Videos

Detecting Protein Subcellular Localization by Green Fluorescence Protein Tagging and 4',6-Diamidino-2-phenylindole Staining in Caenorhabditis elegans09:36

Detecting Protein Subcellular Localization by Green Fluorescence Protein Tagging and 4',6-Diamidino-2-phenylindole Staining in Caenorhabditis elegans

Published on: July 30, 2018

9.0K
Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans09:18

Quantifying Tissue-Specific Proteostatic Decline in Caenorhabditis elegans

Published on: September 7, 2021

2.1K

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...
4.0K
Replicative Cell Senescence02:15

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...
3.5K
Cells Coordinate Growth and Proliferation02:36

Cells Coordinate Growth and Proliferation

Cell size is a significant factor impacting cellular design, function, and fitness. There exists some internal coordination by which cells double their masses before division, thus, achieving homeostasis. Coordination between cell growth and proliferation depends on the checkpoints in between cell cycle phases. Loss of coordination or failure in the checkpoint mechanism can drive the cell to uncontrolled growth and loss of cellular function. Like dividing cells that coordinate cellular growth,...
3.8K
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.
32.1K
Molecular Factors Affecting Cell Division01:27

Molecular Factors Affecting Cell Division

Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
3.9K
Mitogens and the Cell Cycle02:38

Mitogens and the Cell Cycle

Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
6.3K