Related Experiment Videos
A 28-bp negative element with multiple factor-binding activity controls expression of the vimentin-encoding gene
V Moura-Neto1, M H Kryszke, Z Li
1Laboratoire de Biologie Moléculaire de la Différenciation, Université Paris, France.
Gene
|February 12, 1996
Summary
Researchers identified a novel regulatory element, NE2, in the human VIM gene promoter. This element contributes to tissue-specific gene silencing and culture-dependent activation, involving multiple regulatory factors.
Area of Science:
- Molecular Biology
- Gene Regulation
Background:
- The human vimentin gene (VIM) promoter has two enhancers (distal and proximal) bound by transcription factors AP-1 and NK-kappaB, respectively.
- These factors influence VIM synthesis, particularly in response to serum.
- Understanding tissue-specific extinction and culture-dependent activation of VIM is crucial.
Purpose of the Study:
- To identify specific regulatory elements controlling human VIM expression.
- To investigate the role of novel sequences in VIM gene regulation.
Main Methods:
- Sequence analysis of the VIM promoter.
- Transfection experiments to assess regulatory element function.
- In vitro binding assays to identify protein interactions.
Main Results:
- A previously unreported 48-bp sequence, termed NE2, was identified within the distal enhancer.
- NE2 functions as a negative regulatory element, conferring transcriptional repression in transfection assays.
- NE2 binds at least two distinct factors in vitro.
Conclusions:
- NE2 is a novel regulatory element involved in VIM gene expression.
- This element may play a role in the differentiation-stage-specific control of VIM.
- VIM expression is regulated by a complex interplay of multiple regulatory sequences and trans-acting factors.