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Johanson-Blizzard syndrome(yō-hahn'sŏn bliz'ard), [MIM*243800]
a clinical syndrome manifested by pancreatic insufficiency, scalp defects, aplasia of the alae nasi, deafness, low birthweight, microcephaly, psychomotor delay, hypothyroidism, dwarfism, and missing permanent teeth.
Johanson-Blizzard syndromeAn autosomal recessive disorder (OMIM:243800) characterised by poor growth, mental retardation and dysmorphic features (e.g., aplasia or hypoplasia of nasal alae), abnormal hair patterns or scalp defects, and oligodontia. It is variably accompanied by hypothyroidism, sensorineural hearing loss, imperforate anus and pancreatic exocrine insufficiency.
Defects of UBR1, which encodes an E3 ubiquitin-protein ligase involved in protein degradation, cause Johanson-Blizzard syndrome.