The hinge-1 domain of Flna is not necessary for diverse physiological functions in mice.

Introduction: The filamins are cytoskeletal binding proteins that dynamically crosslink actin into orthogonal networks or bundle it into stress fibres. The domain structure of filamin proteins is very well characterised, with an N-terminal actin-binding region, followed by 24 immunoglobulin-like repeat units. The repeat domains are separated into distinct segments by two regions of low-complexity known as hinge-1 and hinge-2.

filaminopathy skeletal phenotypes are not due to an osteoblast autonomous loss-of-function.

Mutations in , which encodes the cytoskeletal protein FLNA, cause a spectrum of sclerosing skeletal dysplasias. Although many of these genetic variants are recurrent and cluster within the gene, the pathogenic mechanism that underpins the development of these skeletal phenotypes is unknown. To determine if the skeletal dysplasia in -related conditions is due to a cell-autonomous loss-of-function localising to osteoblasts and/or osteocytes, we utilised mouse models to conditionally remove from this cellular lineage.