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Transcriptional repression by the basic helix-loop-helix protein Dec2: multiple mechanisms through E-box elements.

Katsumi Fujimoto¹, Hidenori Hamaguchi, Takafumi Hashiba

¹Department of Dental and Medical Biochemistry, Hiroshima University Graduate School of Biomedical Sciences, Hiroshima 734-8553, Japan.

International Journal of Molecular Medicine

|May 10, 2007

Summary

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Dec2, a transcriptional repressor, uses multiple mechanisms including DNA binding and protein interactions to regulate gene expression via E-box elements. It recruits histone deacetylase 1 (HDAC1) for repression, but also inhibits MyoD activity independently of HDAC1.

Area of Science:

Molecular Biology
Gene Regulation
Chronobiology

Background:

Dec2 is a bHLH transcriptional repressor involved in cell proliferation and differentiation.
Dec2 exhibits circadian oscillations in the suprachiasmatic nucleus.

Purpose of the Study:

To elucidate the molecular mechanisms of Dec2-mediated gene expression regulation.
To perform structure-function analyses of Dec2.

Main Methods:

Gel retardation assays
Luciferase assays
GAL4-DNA binding domain fusion protein studies

Main Results:

Dec2 and Dec1 bind to class B E-box elements (CACGTG) as homodimers, repressing transcription in an HDAC-dependent manner.

Related Experiment Videos

The C-terminal region of Dec2 is crucial for repression and HDAC1 recruitment.

Dec2 forms heterodimers with MyoD via basic and HLH domains, inhibiting MyoD activity independently of HDAC1.

Conclusions:

Dec2 employs diverse mechanisms, including DNA binding and protein-protein interactions, for E-box-dependent transcriptional repression.
Dec2's function involves both HDAC-dependent and independent pathways.