Related Experiment Videos
[Signals and transcription factors]
1Dept. of Viral Oncology, Institute for Virus Research, Kyoto University.
Gan to Kagaku Ryoho. Cancer & Chemotherapy
|March 1, 1989
Summary
Growth signals like Ha-ras and TPA activate the polyomavirus enhancer by targeting transcription factors. Cancer-associated changes alter these factors, impacting gene regulation.
Area of Science:
- Molecular Biology
- Cellular Biology
- Cancer Research
Context:
- Growth signals regulate gene transcription through specific DNA-binding proteins.
- The polyomavirus enhancer serves as a model system to study these regulatory mechanisms.
- Aberrant signaling pathways, such as those involving the Ha-ras gene, are implicated in cancer development.
Purpose:
- To investigate the molecular mechanisms by which growth signals modulate transcriptional activator proteins.
- To identify and characterize nuclear factors that bind to the polyomavirus enhancer core.
- To understand how alterations in these factors relate to developmental regulation and cancer.
Summary:
- Both Ha-ras and TPA stimulate the polyomavirus enhancer by targeting the PEBP1 recognition sequence (AP1 consensus).
- Ha-ras transformation leads to the emergence of PEBP3, composed of alpha and beta subunits, which binds to the same site as PEBP1/PEBP2.
- PEBP3 formation is linked to under-phosphorylation of PEBP1/PEBP2, and a repressor, PEBP4, is also identified.
Impact:
- This study proposes a model for how developmental gene regulation is altered in cancer cells.
- Identifies novel nuclear factors (PEBP3, PEBP4) involved in transcriptional regulation.
- Provides insights into the molecular basis of aberrant gene expression in oncogenesis.