In 19 patients with hypopituitarism, Diaczok et al. (2008) analyzed 8 genes encoding pituitary-specific transcription factors, including HESX1 (601802), LHX3 (600577), LHX4 (602146), OTX2, PITX2 (601542), POU1F1 (173110), PROP1 (601538), and SIX6 (606326), and identified heterozygosity for a ... In 19 patients with hypopituitarism, Diaczok et al. (2008) analyzed 8 genes encoding pituitary-specific transcription factors, including HESX1 (601802), LHX3 (600577), LHX4 (602146), OTX2, PITX2 (601542), POU1F1 (173110), PROP1 (601538), and SIX6 (606326), and identified heterozygosity for a missense mutation in the OTX2 gene (600037.0006) in 2 unrelated patients. One was a 6-year-old boy with deficiency of GH, adrenocorticotropic hormone (ACTH), thyroid-stimulating hormone (TSH), luteinizing hormone (LH), and follicle-stimulating hormone (FSH), who on MRI had an ectopic neurohypophysis, along with a hypoplastic adenohypophysis and absent or severely hypoplastic pituitary stalk. The other patient was a 14-year-old girl with deficiency of TSH, ACTH, and GH, in whom MRI at age 2 months showed hypoplasia of the pituitary with a posterior bright spot. Neither patient had midline or optic nerve abnormalities.