Related Experiment Video
Updated: Aug 7, 2026
10:54
Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
Published on: September 17, 2012
The cyclin D1b splice variant: an old oncogene learns new tricks
1Department of Cell Biology, Center for Environmental Genetics, University of Cincinnati College of Medicine, Cincinnati, Ohio 45267-0521, USA. karen.knudsen@uc.edu
Cell Division
|July 26, 2006
Summary
Cyclin D1 regulates the cell cycle and promotes proliferation through kinase activity and other functions. A specific variant, cyclin D1b, has unique roles in cancer cell proliferation, particularly in prostate cancer.
Area of Science:
- Molecular Biology
- Oncology
Background:
- Cyclin D1 is a known cell cycle regulator and proto-oncogene, promoting proliferation via CDK4/6 activation.
- Emerging research highlights kinase-independent functions of cyclin D1, including sequestering CDK inhibitors and modulating transcription factors.
- Aberrant cyclin D1 expression (amplification, overexpression) and a specific splice variant (cyclin D1b) are implicated in various cancers.
Purpose of the Study:
- To review the literature on cyclin D1b's role in aberrant cancer cell proliferation.
- To discuss the distinct functions of cyclin D1 and cyclin D1b in prostate cancer and their impact on proliferative control.
Main Methods:
- Literature review of studies investigating cyclin D1 and its splice variants in cancer.
- Analysis of functional data implicating cyclin D1b in cancer cell proliferation.
- Examination of research on cyclin D1 and cyclin D1b in the context of prostate cancer.
Main Results:
- Cyclin D1 promotes cell proliferation through both kinase-dependent and -independent mechanisms.
- Cyclin D1b exhibits unique activities contributing to aberrant proliferation in cancer cells.
- Differential roles of cyclin D1 and cyclin D1b in prostate cancer are linked to altered proliferative control.
Conclusions:
- Cyclin D1 and its splice variant cyclin D1b play significant roles in cancer proliferation.
- Understanding the specific functions of cyclin D1b is crucial for cancer research, especially in prostate cancer.
- Further investigation into these isoforms may reveal novel therapeutic targets for cancer treatment.
Related Concept Videos
02:39Positive Regulator Molecules
Mitotic cell division results in daughter cells that exactly resemble the parent cell. However, errors in the DNA replication or distribution of genetic material may lead to genetic mutations that may be passed down to every new cell formed from the resulting abnormal cell. Propagation of such mutant cells is restricted through checkpoint mechanisms present at different stages of the cell cycle. These checkpoints involve regulator molecules that either promote or demote cell cycle events.
01:45Positive Regulator Molecules
To consistently produce healthy cells, the cell cycle—the process that generates daughter cells—must be precisely regulated.
02:34Inhibition 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...
02:34Inhibition 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...
02:38Mitogens 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...
02:38Mitogens 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...