BHLHE40 and ChREBP associate with hepatic enhancer clusters containing PPARα, RXRα, and HNF4 nuclear receptors
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ID: 325814
2026
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Abstract
BHLHE40/DEC1 is a basic helix-loop-helix transcription factor (TF) that regulates circadian rhythm and T cell responses. In hepatocytes, its function and interplay with other TFs are poorly understood. Employing a genome-wide approach, we show that its genomic binding strongly overlapped with that of carbohydrate response-element binding protein (ChREBP), a sugar sensing TF and known inducer of BHLHE40 expression. Transcriptomic analysis of primary mouse hepatocytes revealed reduced expression of genes involved in genomic stability upon Bhlhe40 knock down by siRNA. Bhlhe40 depletion potentiated fructose responsiveness of genes involved in cell cycle regulation. Strikingly, genomic binding of BHLHE40 extensively overlapped with enhancers occupied by PPARα, RXRα, and HNF4 nuclear receptors and BHLHE40 fine-tuned the expression of PPARα target genes. Using HEK293 cells, we further observed that BHLHE40 physically interacted with RXRα and PPARα cofactors. Collectively, our data suggest that through cooperation with ChREBP and nuclear receptors, BHLHE40 is a central regulator of hepatic gene expression with potential to integrate inputs from nutrient signals contributing to the metabolic flexibility of the liver.
| Reference Key |
openalex_W7203933546
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| Authors | Krista Kokki, Sylvia J. Wowro, Marius R. Robciuc, Atte Hallasaari, Linda Porri, Matias Kinnunen, Catrin A. Stegmann, Konstantin M. Petricek, Markku Varjosalo, Michael Schupp, Ville Hietakangas |
| Journal | american journal of physiology endocrinology and metabolism |
| Year | 2026 |
| DOI |
10.1210/endocr/bqag095
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| URL | |
| Keywords | Keywords not found |
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