MedGen

The 1q21.1 recurrent microdeletion itself does not appear to lead to a clinically recognizable syndrome as some persons with the deletion have no obvious clinical findings and others have variable findings that most commonly include microcephaly (50%), mild intellectual disability (30%), mildly dysmorphic facial features, and eye abnormalities (26%). Other findings can include cardiac defects, genitourinary anomalies, skeletal malformations, and seizures (~15%). Psychiatric and behavioral abnormalities can include autism spectrum disorders, attention deficit hyperactivity disorder, autistic features, and sleep disturbances. [from GeneReviews]

Mutations in the GJA8 gene have been found to cause several types of autosomal dominant cataract, which have been described as congenital, zonular pulverulent, nuclear progressive, nuclear pulverulent, stellate nuclear, nuclear total, total, and posterior subcapsular. Cataract associated with microcornea, sometimes called the cataract-microcornea syndrome, is also caused by mutation in the GJA8 gene. Before it was known that mutation in the GJB8 gene caused multiple types of cataract, this entry was titled 'Cataract, zonular pulverulent, 1,' with the symbols CZP1, CZP, and CAE1. [from OMIM]