Brachydactyly, Type A1, D, also known as brachydactyly type a1d, is related to brachydactyly, type a4 and acrocapitofemoral dysplasia. An important gene associated with Brachydactyly, Type A1, D is BMPR1B (Bone Morphogenetic Protein Receptor Type 1B), and among its related pathways/superpathways are ERK Signaling and Osteoblast differentiation and related diseases. Affiliated tissues include bone, and related phenotypes are clinodactyly of the 5th finger and short distal phalanx of the thumb