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Activation of Wnt signaling leads to high bone density. The R-spondin family of four secreted glycoproteins (Rspo1-4) amplifies Wnt signaling. In humans, RSPO3 variants are strongly associated with bone density, but how RSPO3 affects skeletal homeostasis is not fully understood. Here we show that in mice Rspo3 haplo-insufficiency or its targeted deletion in osteoprogenitors lead to an increase in bone formation and bone mass. Contrary to expectations, Rspo3 haplo-insufficiency results indoi:10.21203/rs.3.rs-569623/v2 fatcat:5afwuvvmirc7jfrvcc4qjfgwfi