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Nuclear factor I-A represses expression of the cell adhesion molecule L1
Tanja Schneegans1, Uwe Borgmeyer, Moritz Hentschke
1Zentrum für Molekulare Neurobiologie, Universitätsklinikum Hamburg-Eppendorf, D-20246 Hamburg, Germany. Tanja.Schneegans@gmx.de
BMC Molecular Biology
|December 17, 2009
Summary
Nuclear Factor I-A (NFI-A) binds to the mouse L1 gene regulatory region. This brain-specific NFI-A isoform represses L1 gene expression, potentially acting as a novel silencer.
Area of Science:
- Neuroscience
- Molecular Biology
- Gene Regulation
Background:
- The neural cell adhesion molecule L1 (L1) is vital for nervous system development and plasticity.
- Precise control of L1 expression is essential for neural cell function.
Purpose of the Study:
- To investigate the regulatory mechanisms controlling L1 gene expression.
- To identify transcription factors that bind to the L1 gene regulatory region.
Main Methods:
- Identification of transcription factor binding sites in the L1 gene promoter.
- Electrophoretic mobility shift assay (EMSA) to confirm protein-DNA binding.
- Chromatin immunoprecipitation (ChIP) to validate in vivo interactions.
- Reporter gene assays to assess functional impact on gene expression.
Main Results:
- A binding site for nuclear factor I (NFI) transcription factors was identified in the L1 gene regulatory region.
- Nuclear factor I-A (NFI-A) was shown to bind to this site via EMSA.
- The brain-specific isoform of NFI-A (NFI-A bs) interaction with the L1 gene was confirmed in vivo using ChIP.
- Overexpression of NFI-A bs led to a threefold repression of L1 expression in neuroblastoma cells.
Conclusions:
- NFI-A, particularly its brain-specific isoform, acts as a repressor of L1 gene expression.
- NFI-A may function as an additional silencer of L1, alongside the neural restrictive silencer factor (NRSF).
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