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Eggenschwiler R, Patronov A, Hegermann J, Fráguas-Eggenschwiler M, Wu G, Cortnumme L, Ochs M, Antes I, Cantz T. A combined in silico and in vitro study on mouse Serpina1a antitrypsin-deficiency mutants. Sci Rep 2019; 9:7486. [PMID: 31097772 PMCID: PMC6522476 DOI: 10.1038/s41598-019-44043-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 05/07/2019] [Indexed: 01/15/2023] Open
Abstract
Certain point-mutations in the human SERPINA1-gene can cause severe α1-antitrypsin-deficiency (A1AT-D). Affected individuals can suffer from loss-of-function lung-disease and from gain-of-function liver-disease phenotypes. However, age of onset and severity of clinical appearance is heterogeneous amongst carriers, suggesting involvement of additional genetic and environmental factors. The generation of authentic A1AT-D mouse-models has been hampered by the complexity of the mouse Serpina1-gene locus and a model with concurrent lung and liver-disease is still missing. Here, we investigate point-mutations in the mouse Serpina1a antitrypsin-orthologue, which are homolog-equivalent to ones known to cause severe A1AT-D in human. We combine in silico and in vitro methods and we find that analyzed mutations do introduce potential disease-causing properties into Serpina1a. Finally, we show that introduction of the King’s-mutation causes inactivation of neutrophil elastase inhibitory-function in both, mouse and human antitrypsin, while the mouse Z-mutant retains activity. This work paves the path to generation of better A1AT-D mouse-models.
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Affiliation(s)
- Reto Eggenschwiler
- Research Group Translational Hepatology and Stem Cell Biology, Cluster of Excellence REBIRTH, Hannover Medical School, Hannover, 30625, Germany. .,Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, 30625, Germany.
| | - Atanas Patronov
- Protein Modelling Group, Department of Life Sciences, Technical University Munich, Freising, 85354, Germany.,TUM School of Life Sciences, Center for Integrated Protein Science (CIPSM), Technical University Munich, Freising, 85354, Germany
| | - Jan Hegermann
- Research Core Unit Electron Microscopy, Hannover Medical School, Hannover, 30625, Germany.,Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, 30625, Germany.,Imaging Platform of the Cluster of Excellence REBIRTH, Hannover Medical School, Hannover, 30625, Germany
| | - Mariane Fráguas-Eggenschwiler
- Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, 30625, Germany.,TWINCORE, Centre for Experimental and Clinical Infection Research, Hannover, 30625, Germany
| | - Guangming Wu
- Max Planck Institute for Molecular Biomedicine, Cell and Developmental Biology, Münster, 48149, Germany
| | - Leon Cortnumme
- Research Group Translational Hepatology and Stem Cell Biology, Cluster of Excellence REBIRTH, Hannover Medical School, Hannover, 30625, Germany.,Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, 30625, Germany
| | - Matthias Ochs
- Research Core Unit Electron Microscopy, Hannover Medical School, Hannover, 30625, Germany.,Institute of Functional and Applied Anatomy, Hannover Medical School, Hannover, 30625, Germany.,Imaging Platform of the Cluster of Excellence REBIRTH, Hannover Medical School, Hannover, 30625, Germany.,Institute of Vegetative Anatomy Charité - Universitaetsmedizin Berlin, Berlin, 10115, Germany
| | - Iris Antes
- Protein Modelling Group, Department of Life Sciences, Technical University Munich, Freising, 85354, Germany.,TUM School of Life Sciences, Center for Integrated Protein Science (CIPSM), Technical University Munich, Freising, 85354, Germany
| | - Tobias Cantz
- Research Group Translational Hepatology and Stem Cell Biology, Cluster of Excellence REBIRTH, Hannover Medical School, Hannover, 30625, Germany. .,Department of Gastroenterology, Hepatology and Endocrinology, Hannover Medical School, Hannover, 30625, Germany. .,Max Planck Institute for Molecular Biomedicine, Cell and Developmental Biology, Münster, 48149, Germany.
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