Hepatocyte nuclear factor 1β binding in E14.5 kidney
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA844065 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR19454992.fastq.gz | Fastqsanger.gz | |||
| SRR19454993.fastq.gz | Fastqsanger.gz | |||
| SRR19454994.fastq.gz | Fastqsanger.gz | |||
| SRR19454995.fastq.gz | Fastqsanger.gz | |||
| SRR19454996.fastq.gz | Fastqsanger.gz |
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Project description:Hepatocyte nuclear factor-1β (HNF-1β) is a tissue-specific transcription factor that is essential for normal kidney development and renal tubular function. Mutations of HNF-1β produce cystic kidney disease, a phenotype associated with deregulation of canonical (β-catenin-dependent) Wnt signaling. Here, we show that ablation of HNF-1β in mIMCD3 renal epithelial cells produces hyperresponsiveness to Wnt ligands and increases expression of Wnt target genes, including Axin2, Ccdc80, and Rnf43. Levels of β-catenin and expression of Wnt target genes are also increased in HNF-1β mutant mouse kidneys. Genome-wide ChIP-seq in wild-type and mutant cells showed that ablation of HNF-1β increases by five-fold the number of sites on chromatin that are occupied by β-catenin. Remarkably, 50% of the sites that are occupied by β-catenin in HNF-1β mutant cells colocalize with HNF-1β binding sites in wild-type cells, indicating widespread reciprocal binding. We found that the Wnt target genes Ccdc80 and Rnf43 contain a novel composite DNA element comprising a β-catenin/lymphoid enhancer binding factor (LEF) site overlapping with an HNF-1β half-site. HNF-1β directly competes with the binding of β-catenin/LEF complexes to this element and thereby inhibits β-catenin-dependent transcription. Collectively, these studies reveal a novel mechanism whereby a transcription factor constrains canonical Wnt signaling through direct inhibition of β-catenin/LEF chromatin binding.
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Project description:Hepatocyte nuclear factor-1β (HNF-1β) is a tissue-specific transcription factor that is essential for the development of the kidney. Mutations of HNF-1β produce autosomal dominant tubulointerstitial kidney disease (ADTKD) characterized by tubular cysts, renal fibrosis, and progressive decline in kidney function. To understand the functions of HNF-1β, we generated HNF-1β-deficient mIMCD3 renal epithelial cells. Gene editing with CRISPR/Cas9 was used to delete exon 1 of HNF-1β by non-homologous end joining (NHEJ). We performed RNA-seq on three independent HNF-1β-deficient mIMCD3 cell lines and three paired control cell lines. Our RNA-seq of HNF-1β-deficient cells showed upregulation of 1,135 genes and repression of 759 genes compared to control cells. Pathway analysis revealed that fibrosis and epithelial-mesenchymal transition (EMT) pathways were highly activated in HNF-1β-deficient cells. We conclude that loss of HNF-1β in renal epithelial cells leads to the activation of a transcriptional network that induces EMT and aberrant TGFβ signaling. Targeting this network may inhibit fibrosis in ADTKD and other chronic kidney diseases.
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Project description:This study was performed to identify miRNAs that are differentially regulated during mouse kidney development. Two stages (E14.5 and P1) were analyzed. Differential expression was verified using qPCR and/or in situ hybridization.
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Project description:Hepatocyte nuclear factor-1β regulates Wnt signaling through genome-wide competition with β-catenin/lymphoid enhancer binding factor
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Project description:Hepatocyte nuclear factor-1β (HNF-1β) is an essential transcription factor that regulates tissue-specific gene expression in the kidney, liver, pancreas and genitourinary tract. In humans, mutations of HNF-1β cause renal cysts and diabetes (RCAD) and congenital anomalies of the kidney and urinary tract (CAKUT). Inactivation of Hnf-1β in tubular epithelial cells throughout the nephron leads to early-onset cyst formation and postnatal lethality. Here, we used Pkhd1/Cre mice to delete Hnf-1β specifically in renal collecting ducts (CD). Hnf-1β mutant mice survived long-term and developed slowly progressive cystic kidney disease, renal fibrosis, and hydronephrosis. Compared with wild-type littermates, Hnf-1β mutant mice had higher urine volume, lower urine osmolality, and higher water intake. Differences were seen at baseline, following 24h water restriction, and following administration of dDAVP. Circulating ADH levels were similar in wild type and mutant mice. Polyuria, polydipsia, and decreased urine osmolality were present prior to the onset of cyst formation and hydronephrosis. These findings indicated that Hnf-1β mutant mice have a primary defect in urinary concentrating ability. Studies using in vitro hypertonicity response experiments identified NR1H4 (FXR), a transcription factor previously shown to regulate water homeostasis, as a novel HNF-1β target. mIMCD3 cells exposed to hypertonic medium robustly upregulated Fxr mRNA levels; this upregulation was lost in Hnf-1β mutant cells. HNF-1β was bound to the Fxr promoter region in vivo, and Fxr mRNA was significantly downregulated in mutant mice. FXR protein localized to CD in wild-type mice and was almost undetectable in the cyst epithelium of mutant mice. These findings highlight a new and critical role for HNF-1β in urinary concentration and hypertonicity by regulating the transcription of FXR in the CD.
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