NORD gratefully acknowledges Martin Zenker, MD, Institute of Human Genetics, University Hospital Magdeburg, Germany, for assistance in the preparation of this report.
Johanson-Blizzard syndrome (JBS) is an extremely rare genetic disorder that affects multiple organ systems of the body. Many symptoms are present at birth (congenital) or early childhood. The spectrum of potential features and physical findings associated with JBS is wide and varied and can differ dramatically from one person to another. However, characteristic features include insufficient intestinal absorption (malabsorption) of fats and other nutrients due to abnormal development of the pancreas (pancreatic insufficiency); failure to grow and gain weight at the expected rate (failure to thrive) during the first years of life, contributing to short stature; abnormalities of permanent teeth; distinctive abnormalities of the skull and facial (craniofacial) region including a small "beak-shaped" nose; and/or varying degrees of intellectual disability. JBS is caused by mutations to the UBR1 gene. This genetic mutation is inherited as an autosomal recessive trait.
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