Abstract
Familial digital arthropathy-brachydactyly (FDAB) is a dominantly inherited condition that is characterized by aggressive osteoarthropathy of the fingers and toes and consequent shortening of the middle and distal phalanges1. Here we show in three unrelated families that FDAB is caused by mutations encoding p.Gly270Val, p.Arg271Pro and p.Phe273Leu substitutions in the intracellular ankyrin-repeat domain of the cation channel TRPV4. Functional testing of mutant TRPV4 in HEK-293 cells showed that the mutant proteins have poor cell-surface localization. Calcium influx in response to the synthetic TRPV4 agonists GSK1016790A and 4αPDD was significantly reduced, and mutant channels did not respond to hypotonic stress. Others have shown that gain-of-function TRPV4 mutations cause skeletal dysplasias and peripheral neuropathies2,3,4,5,6,7,8,9,10,11. Our data indicate that TRPV4 mutations that reduce channel activity cause a third phenotype, inherited osteoarthropathy, and show the importance of TRPV4 activity in articular cartilage homeostasis. Our data raise the possibility that TRPV4 may also have a role in age- or injury-related osteoarthritis.
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Acknowledgements
We thank U. Maus for referring one subject to the Institute of Human Genetics in Aachen. This work was supported in part by grants from the National Health and Medical Research Council of Australia (350347, 384414, 436903, 490037, 566834) and by the Victorian Government's Operational Infrastructure Support Program.
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R.S., D.J.A., E.B., K.Z. and W.G.C. recruited the study participants and collected clinical data. S.R.L., J.F.B., P.M., C.B.L. and R.S. designed and supervised the study. I.L.G. performed the linkage analyses, S.R.L. identified the mutations and made the expression constructs and Y.Y. made the transfected cell lines and carried out the calcium imaging and immunoblotting experiments. L.R. and K.K. performed the quantitative RT-PCR and immunostaining. L.R., D.B. and C.B.L. carried out the mouse osteoarthritis experiments. S.R.L. wrote the manuscript. All authors reviewed the manuscript.
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Lamandé, S., Yuan, Y., Gresshoff, I. et al. Mutations in TRPV4 cause an inherited arthropathy of hands and feet. Nat Genet 43, 1142–1146 (2011). https://doi.org/10.1038/ng.945
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DOI: https://doi.org/10.1038/ng.945
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