Genetic and Molecular Insights Into Genotype-Phenotype Relationships in Osteopathia Striata With Cranial Sclerosis (OSCS) Through the Analysis of Novel Mouse Wtx Mutant Alleles
| Autor: | Martine Cohen-Solal, Robert Brommage, Filippo Massa, Wolfgang Hans, Martin Hrabé de Angelis, Aurelie Charlet, Agnès Boutet, Ana-Sofia Rocha, Thomas Funck-Brentano, Fariba Jian Motamedi, Clara Panzolini, Glenda Comai, Kristina Tanneberger, Christine Hartmann, Jürgen Behrens, Andreas Schedl |
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| Rok vydání: | 2018 |
| Předmět: |
0301 basic medicine
Endocrinology Diabetes and Metabolism Biology medicine.disease Phenotype Osteopathia striata 03 medical and health sciences Skull 030104 developmental biology medicine.anatomical_structure Germline mutation Dysplasia AXIN2 medicine Cancer research Orthopedics and Sports Medicine Allele Gene |
| Zdroj: | Journal of Bone and Mineral Research. 33:875-887 |
| ISSN: | 0884-0431 |
| Popis: | The X-linked WTX/AMER1 protein constitutes an important component of the β-catenin destruction complex that can both enhance and suppress canonical β-catenin signaling. Somatic mutations in WTX/AMER1 have been found in a proportion of the pediatric kidney cancer Wilms' tumor. By contrast, germline mutations cause the severe sclerosing bone dysplasia osteopathia striata congenita with cranial sclerosis (OSCS), a condition usually associated with fetal or perinatal lethality in male patients. Here we address the developmental and molecular function of WTX by generating two novel mouse alleles. We show that in addition to the previously reported skeletal abnormalities, loss of Wtx causes severe midline fusion defects including cleft palate and ectopic synostosis at the base of the skull. By contrast, deletion of the C-terminal part of the protein results in only mild developmental abnormalities permitting survival beyond birth. Adult analysis, however, revealed skeletal defects including changed skull morphology and an increased whole-body bone density, resembling a subgroup of male patients carrying a milder, survivable phenotype. Molecular analysis in vitro showed that while β-catenin fails to co-immunoprecipitate with the truncated protein, partial recruitment appears to be achieved in an indirect manner using AXIN/AXIN2 as a molecular bridge. Taken together our analysis provides a novel model for WTX-caused bone diseases and explains on the molecular level how truncation mutations in this gene may retain some of WTX-protein functions. © 2018 American Society for Bone and Mineral Research. |
| Databáze: | OpenAIRE |
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