title: A Grainyhead-Like 2/Ovo-Like 2 Pathway Regulates Renal Epithelial Barrier Function and Lumen Expansion.
abstract: Grainyhead transcription factors control epithelial barriers, tissue morphogenesis, and differentiation, but their role in the kidney is poorly understood. Here, we report that nephric duct, ureteric bud, and collecting duct epithelia express high levels of grainyhead-like homolog 2 (Grhl2) and that nephric duct lumen expansion is defective in Grhl2-deficient mice. In collecting duct epithelial cells, Grhl2 inactivation impaired epithelial barrier formation and inhibited lumen expansion. Molecular analyses showed that GRHL2 acts as a transcriptional activator and strongly associates with histone H3 lysine 4 trimethylation. Integrating genome-wide GRHL2 binding as well as H3 lysine 4 trimethylation chromatin immunoprecipitation sequencing and gene expression data allowed us to derive a high-confidence GRHL2 target set. GRHL2 transactivated a group of genes including Ovol2, encoding the ovo-like 2 zinc finger transcription factor, as well as E-cadherin, claudin 4 (Cldn4), and the small GTPase Rab25. Ovol2 induction alone was sufficient to bypass the requirement of Grhl2 for E-cadherin, Cldn4, and Rab25 expression. Re-expression of either Ovol2 or a combination of Cldn4 and Rab25 was sufficient to rescue lumen expansion and barrier formation in Grhl2-deficient collecting duct cells. Hence, we identified a Grhl2/Ovol2 network controlling Cldn4 and Rab25 expression that facilitates lumen expansion and barrier formation in subtypes of renal epithelia.
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Experimental and Clinical Research Center, and.
authors: Annekatrin
authors: A
authors: Aue
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Departments of Nephrology.
authors: Christian
authors: C
authors: Hinze
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany;
authors: Katharina
authors: K
authors: Walentin
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany;
authors: Janett
authors: J
authors: Ruffert
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Urology, Berlin Institute of Urologic Research, Berlin, Germany.
authors: Yesim
authors: Y
authors: Yurtdas
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany;
authors: Max
authors: M
authors: Werth
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany;
authors: Wei
authors: W
authors: Chen
authors: Urology, Berlin Institute of Urologic Research, Berlin, Germany.
authors: Anja
authors: A
authors: Rabien
authors: Pathology, and.
authors: Ergin
authors: E
authors: Kilic
authors: Gastroenterology, Charité Medical University, Berlin, Germany; and.
authors: Jörg-Dieter
authors: JD
authors: Schulzke
authors: Gastroenterology, Charité Medical University, Berlin, Germany; and.
authors: Michael
authors: M
authors: Schumann
authors: Max Delbrueck Center for Molecular Medicine, Berlin, Germany; Experimental and Clinical Research Center, and Departments of Nephrology, kai.schmidt-ott@charite.de.
authors: Kai M
authors: KM
authors: Schmidt-Ott
mesh_terms: D000818:Animals; D001665:Binding Sites; D002467:Cell Nucleus / Q000378:metabolism; D047369:Chromatin Immunoprecipitation; D062506:Claudin-4 / Q000378:metabolism; D004247:DNA / Q000737:chemistry; D004848:Epithelium / Q000378:metabolism*; D005786:Gene Expression Regulation; D018014:Gene Transfer Techniques; D006657:Histones / Q000737:chemistry; D006801:Humans; D007150:Immunohistochemistry; D007668:Kidney / Q000196:embryology* / Q000378:metabolism; D007685:Kidney Tubules, Collecting / Q000378:metabolism; D051379:Mice; D020411:Oligonucleotide Array Sequence Analysis; D010641:Phenotype; D011485:Protein Binding; D011506:Proteins / Q000378:metabolism; D015398:Signal Transduction; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D062506:Claudin-4; C568158:Cldn4 protein, mouse; D006657:Histones; C426009:LAMTOR2 protein, mouse; C491431:MOVO protein, mouse; D011506:Proteins; D014157:Transcription Factors; C552738:grainy head-like 2 protein, mouse; D004247:DNA
keywords: Grainyhead transcription factors; Grainyhead-like 2; barrier; collecting duct; formation; lumen expansion; nephric duct