Cataracts, Congenital Nuclear

Clinical Characteristics
Ocular Features: 

Congenital nuclear cataracts are the only ocular abnormalities in these conditions.  There may be some cortical opacifications as well.  The nuclear opacifications may not be sufficiently dense in some patients to require cataract surgery.  Nothing is known of their natural history, however.

Systemic Features: 

No systemic disease is associated with these congenital cataracts.


All three of these nuclear cataracts are inherited in autosomal recessive patterns.  They have been reported in rare families in which the parents were consanguineous.

CATCN1 was reported in a 4-generation Pakistani family having an unknown mutation localized to 19q13.

Another congenital nuclear cataract (CATCN2) results from mutations in the CRYBB3 (22q11.23) gene reported in 2 consanguineous Pakistani families.

CATCN3 results from mutations in CRYBB1 (22q12.1) as reported in two consanguineous Israeli Bedouin families with 14 affected individuals.

Autosomal recessive
Treatment Options: 

Surgical removal may be indicated if the lens opacities are visually significant.  Vision may be sufficiently impaired in some children that surgery is required before 2 years of age.

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