Abstract
Gnathodiaphyseal dysplasia (GDD; OMIM#166260) is a rare skeletal disorder which is mainly characterized by cemento-osseous lesions in mandibles, bone fragility, bowing and diaphyseal sclerosis of tubular bones. GDD is caused by point mutations in Anoctamin-5 (ANO5); however, the disease mechanisms remain unclear. Here we generated Ano5-knockout (KO) mice using a CRISPR/Cas 9 approach to study loss of function aspects of GDD mutations. Homozygous Ano5 knockout mice (Ano5−/−) replicate some typical traits of human GDD including massive jawbones, bowing tibia, sclerosis and cortical thickening of femoral and tibial diaphyses. Serum alkaline phosphatase (ALP) levels were elevated in Ano5−/− mice as in GDD patients. Calvaria-derived Ano5−/− osteoblast cultures show increased osteoblastogenesis, which is consistent with our previous in vitro observations. Bone matrix is hypermineralized, and the expression of bone formation-related factors is enhanced in Ano5−/− mice, suggesting that the osteogenic anomaly arises from a genetic disruption of Ano5. We believe this new mouse model will shed more light on the development of skeletal abnormalities in GDD on a cellular and molecular level.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant # 81570958); Beijing Natural Science Foundation (Grant #7162075); High-level Talents of Beijing Health System (Grant #2013-3-036); and Scientific Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (Grant # 2015-1098).
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Xiaoyu Wang, Xiu Liu, Rui Dong, Chao Liang, Ernst J. Reichenberger and Ying Hu declare that they have no conflict of interest.
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The animal experimentation protocols were approved by the Institutional Animal Care and Use Committee of the Beijing Stomatological Hospital (the approval number: KQYY-201611-001) and were strictly undertaken in accordance with the ethical guidelines of the Caring for Laboratory Animals by the Ministry of Science and Technology of the People’s Republic of China.
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Supplementary material 1. Fig. S1 Skeletal muscle changes in Ano5+/+ and Ano5-/- mice. (A) H&E staining of gastrocnemius muscle of 16-week-old mice. Scale bar = 50 μm. (B) qPCR analysis of Dysferlin and Dystrophin in gastrocnemius (GAS), quadriceps (QD) and biceps muscles of 16-week-old mice. aP < 0.05, bP < 0.01. (C) Elevated serum creatine kinase (CK) level was detected in 16-week-old Ano5-/- mice. (n = 5). bP < 0.01 (DOCX 1084 KB)
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Wang, X., Liu, X., Dong, R. et al. Genetic Disruption of Anoctamin 5 in Mice Replicates Human Gnathodiaphyseal Dysplasia (GDD). Calcif Tissue Int 104, 679–689 (2019). https://doi.org/10.1007/s00223-019-00528-x
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DOI: https://doi.org/10.1007/s00223-019-00528-x