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Aden K, Bartsch K, Dahl J, Reijns MA, Esser D, Sheibani-Tezerji R, Sinha A, Wottawa F, Ito G, Mishra N, Knittler K, Burkholder A, Welz L, van Es J, Tran F, Lipinski S, Kakavand N, Boeger C, Lucius R, von Schoenfels W, Schafmayer C, Lenk L, Chalaris A, Clevers H, Röcken C, Kaleta C, Rose-John S, Schreiber S, Kunkel T, Rabe B, Rosenstiel P. Epithelial RNase H2 Maintains Genome Integrity and Prevents Intestinal Tumorigenesis in Mice. Gastroenterology 2019; 156:145-159.e19. [PMID: 30273559 PMCID: PMC6311085 DOI: 10.1053/j.gastro.2018.09.047] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2018] [Revised: 09/06/2018] [Accepted: 09/24/2018] [Indexed: 12/02/2022]
Abstract
BACKGROUND & AIMS RNase H2 is a holoenzyme, composed of 3 subunits (ribonuclease H2 subunits A, B, and C), that cleaves RNA:DNA hybrids and removes mis-incorporated ribonucleotides from genomic DNA through ribonucleotide excision repair. Ribonucleotide incorporation by eukaryotic DNA polymerases occurs during every round of genome duplication and produces the most frequent type of naturally occurring DNA lesion. We investigated whether intestinal epithelial proliferation requires RNase H2 function and whether RNase H2 activity is disrupted during intestinal carcinogenesis. METHODS We generated mice with epithelial-specific deletion of ribonuclease H2 subunit B (H2bΔIEC) and mice that also had deletion of tumor-suppressor protein p53 (H2b/p53ΔIEC); we compared phenotypes with those of littermate H2bfl/fl or H2b/p53fl/fl (control) mice at young and old ages. Intestinal tissues were collected and analyzed by histology. We isolated epithelial cells, generated intestinal organoids, and performed RNA sequence analyses. Mutation signatures of spontaneous tumors from H2b/p53ΔIEC mice were characterized by exome sequencing. We collected colorectal tumor specimens from 467 patients, measured levels of ribonuclease H2 subunit B, and associated these with patient survival times and transcriptome data. RESULTS The H2bΔIEC mice had DNA damage to intestinal epithelial cells and proliferative exhaustion of the intestinal stem cell compartment compared with controls and H2b/p53ΔIEC mice. However, H2b/p53ΔIEC mice spontaneously developed small intestine and colon carcinomas. DNA from these tumors contained T>G base substitutions at GTG trinucleotides. Analyses of transcriptomes of human colorectal tumors associated lower levels of RNase H2 with shorter survival times. CONCLUSIONS In analyses of mice with disruption of the ribonuclease H2 subunit B gene and colorectal tumors from patients, we provide evidence that RNase H2 functions as a colorectal tumor suppressor. H2b/p53ΔIEC mice can be used to study the roles of RNase H2 in tissue-specific carcinogenesis.
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Affiliation(s)
- Konrad Aden
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany; First Medical Department, University Hospital Schleswig-Holstein, Kiel, Germany.
| | - Kareen Bartsch
- Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany
| | - Joseph Dahl
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, Durham, North Carolina
| | - Martin A.M. Reijns
- MRC Human Genetics Unit, MRC Institute of Genetics and Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom
| | - Daniela Esser
- Institute for Experimental Medicine, Christian-Albrechts-University, Kiel, Germany
| | - Raheleh Sheibani-Tezerji
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Anupam Sinha
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Felix Wottawa
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Go Ito
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Neha Mishra
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Katharina Knittler
- Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany
| | - Adam Burkholder
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, Durham, North Carolina
| | - Lina Welz
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Johan van Es
- Hubrecht Institute/Royal Netherlands Academy of Arts and Sciences, Princess Maxima Centre and University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Florian Tran
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany,First Medical Department, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Simone Lipinski
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Nassim Kakavand
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Christine Boeger
- Department of Pathology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Ralph Lucius
- Anatomical Institute, Christian-Albrechts-University, Kiel, Germany
| | | | - Clemens Schafmayer
- Department of Surgery, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Lennart Lenk
- Department of Pediatrics, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Athena Chalaris
- Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany
| | - Hans Clevers
- Hubrecht Institute/Royal Netherlands Academy of Arts and Sciences, Princess Maxima Centre and University Medical Centre Utrecht, Utrecht, The Netherlands
| | - Christoph Röcken
- Department of Pathology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
| | - Christoph Kaleta
- Institute for Experimental Medicine, Christian-Albrechts-University, Kiel, Germany
| | - Stefan Rose-John
- Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany
| | - Stefan Schreiber
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany,First Medical Department, University Hospital Schleswig-Holstein, Kiel, Germany
| | - Thomas Kunkel
- Genome Integrity and Structural Biology Laboratory, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, Durham, North Carolina
| | - Björn Rabe
- Institute of Biochemistry, Christian-Albrechts-University, Kiel, Germany
| | - Philip Rosenstiel
- Institute of Clinical Molecular Biology, Christian-Albrechts-University and University Hospital Schleswig-Holstein, Kiel, Germany
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