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Polycomblike protein PHF1b: a transcriptional sensor for GABA receptor activity
Shamol Saha1, Yinghui Hu, Stella C Martin
1Department of Pharmacology & Experimental Therapeutics, Laboratory of Translational Epilepsy, Boston University School of Medicine, Boston, MA 02118, USA.
BMC Pharmacology & Toxicology
|July 25, 2013
Summary
PHD finger protein transcript b (PHF1b) acts as a molecular transducer for GABA(A)R function. This protein regulates GABRB1 gene transcription, impacting GABA-mediated neurotransmission in the central nervous system.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- GABA(A) receptors (GABA(A)Rs) are crucial drug targets for brain disorders like anxiety and epilepsy.
- Understanding neuronal receptor expression regulation offers therapeutic potential.
- GABRB1 gene transcription is autologously regulated by GABA via the β(1)-INR element.
Purpose of the Study:
- Identify proteins associated with the β(1)-INR element of the GABRB1 gene.
- Investigate the role of identified proteins in GABRB1 gene regulation.
- Determine the functional link between GABA(A)R activation and GABRB1 transcription.
Main Methods:
- Yeast one-hybrid screening of a human brain cDNA library to identify β(1)-INR binding proteins.
- Promoter/reporter assays in primary rat cortical cells to assess transcriptional activity.
- Chromatin immunoprecipitation assays to confirm protein binding at the endogenous Gabrb1 locus.
Main Results:
- PHD finger protein transcript b (PHF1b) was identified as a β(1)-INR associated protein.
- PHF1b functions as a transcriptional activator of GABRB1.
- PHF1b binding to Gabrb1 is regulated by GABA(A)R activation and involves interaction with Polycomb Repressive Complex 2 (PRC2) components like SUZ12.
Conclusions:
- PHF1b recognizes the β(1)-INR element via specific protein domains.
- GABA(A)R activation modulates PHF1b binding and histone modifications (H3K27me3) at the GABRB1 gene.
- PHF1b is proposed as a molecular transducer linking GABA(A)R activity to GABRB1 gene transcription and GABAergic neurotransmission.
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