| The most frequent subtype of Joubert syndrome with manifestation of neurological features of Joubert Syndrome associated with retinal dystrophy. Prevalence is unknown. Age of onset and severity of retinal involvement are variable, ranging from congenital to progressive retinopathy with partial conservation of vision. To date, the most frequently mutated gene in this subtype is AHI1 (6q23.2), which accounts for about 20% of cases, following autosomal recessive inheritance. |
