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Updated: Aug 20, 2025
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A Rapid In Vivo Bioassay for Developmentally Active Enhancers
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Hnf1b renal expression directed by a distal enhancer responsive to Pax8
L Goea1,2, I Buisson1, V Bello1
1Laboratoire de Biologie du Développement, CNRS, Institut de Biologie Paris Seine, IBPS, UMR7622, Sorbonne Université, 75005, Paris, France.
Scientific Reports
|November 19, 2022
Summary
Researchers identified a novel renal enhancer (CNS1) that regulates Hnf1b expression, crucial for kidney development. This discovery aids in understanding and modeling congenital kidney anomalies and HNF1B-related diseases.
Area of Science:
- Developmental Biology
- Genetics
- Nephrology
Background:
- Hnf1b (hepatocyte nuclear factor 1 homeobox b) mutations are a leading genetic cause of developmental kidney disease.
- Understanding Hnf1b gene regulation is critical for studying renal development and defects.
Purpose of the Study:
- To investigate the transcriptional regulation of Hnf1b in kidney development.
- To identify regulatory elements controlling Hnf1b expression in the pronephros.
Main Methods:
- Phylogenetic footprinting to identify conserved non-coding sequences.
- Functional expression assays in Xenopus and mammalian renal cell lines.
- CRISPR/cas9 gene editing in Xenopus tropicalis.
Main Results:
- Identified a conserved non-coding sequence (CNS1) with distal enhancer activity in renal cells.
- Demonstrated CNS1's in vivo role in driving hnf1b expression in the developing pronephros.
- Showed that Pax8 interaction with CNS1 is essential for its enhancer function, identifying Hnf1b as a direct Pax8 target.
Conclusions:
- Discovered the first renal-specific enhancer (CNS1) for Hnf1b.
- This finding provides insights into congenital kidney anomalies and HNF1B-related disease modeling.
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