There is also a considerable overlap with the phenotype associated with pseudohypoparathyroidism type 1A and 1C (Albright hereditary osteodystrophy), acrodysostosis, and chromosome 2q37 deletion syndrome (including brachydactyly-mental retardation syndrome because of loss-of-function variants in the HDAC4). The gene discussed is HDAC4; the disease is pseudohypoparathyroidism type 1A.