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Björnstad syndrome is characterized by congenital sensorineural hearing loss and pili torti.
ORPHA:123Classification level: Disorder
Less than fifty cases have been reported so far.
The hearing loss usually becomes evident very early in life, often in the first year. Pili torti, a condition in which the hair shaft is flattened and twisted, makes the hair very brittle and patients develop hair loss in the first two years of life.
Björnstad syndrome is caused by mutations in the BCS1L gene. Mutations in this gene also cause GRACILE syndrome (see this term).
Björnstad syndrome is transmitted as an autosomal recessive condition.