Filamin B (FLNB) is an actin-binding protein that connects cell membrane constituents to the actin cytoskeleton and anchors transmembrane proteins through interactions with actin filaments 1. FLNB functions as a critical regulator of cell migration and skeletal development. Mechanistically, FLNB regulates cellular processes through multiple pathways: it promotes actin cytoskeletal organization essential for cell morphology, it is targeted for ubiquitination and degradation by MTMR7 in spermatogonial stem cells to regulate β-catenin signaling and cell migration 2, and low FLNB levels confer an elongated shape to Th2 lymphocytes facilitating integrin-dependent migration 3. FLNB is required for palatal development during embryogenesis 1 and for maintaining skeletal joint integrity; its absence causes progressive vertebral fusions characteristic of spondylocarpotarsal synostosis syndrome 4. Beyond skeletal disorders, FLNB dysfunction impairs ciliogenesis and left-right patterning, linking it to congenital heart disease and heterotaxy syndrome 5. Clinically, FLNB loss-of-function variants cause non-syndromic orofacial clefts and multiple syndromic skeletal dysplasias 1. FLNB expression levels in monocytes correlate with osteoclast resorptive activity, suggesting potential therapeutic relevance in osteoporosis 6.