Crigler Najjar syndrome, type 2
Other Names for this Disease
- Crigler-Najjar syndrome, type II
 This condition is less severe than the type 1 form, however the severity of type II can vary greatly. Almost all patients with Crigler Najjar syndrome, type 2 develop normally, but there is a risk for some neurologic damage from kernicterus (bilirubin accumulation in the brain). In general people with type 2 Crigler Najjar syndrome have serum bilirubin levels ranging from 20 to 45 mg/dL. Phenobarbital treatment is the standard therapy for this condition and can often help to drastically reduce the bilirubin levels.Crigler Najjar syndrome, type 2 is caused by mutations in the UGT1A1 gene. The gene mutation causes the body to be unable to make adequate enzyme to convert bilirubin into a form that can easily be removed from the body. Without this enzyme, bilirubin can build up in the body and lead to extraordinarily yellow skin and eyes (jaundice).
Last updated: 1/19/2011
- Crigler Najjar syndrome. MedlinePlus. http://www.nlm.nih.gov/medlineplus/ency/article/001127.htm. Accessed 1/19/2011.
- Crigler Najjar syndrome, type II. Online Mendelian Inheritance in Man. http://www.ncbi.nlm.nih.gov/entrez/dispomim.cgi?id=606785. Accessed 1/19/2011.
- Genetics Home Reference (GHR) contains information on Crigler Najjar syndrome, type 2. This website is maintained by the National Library of Medicine.
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- Labrune P. Crigler-Najjar syndrome. Orphanet Encyclopedia. 2004 Jan.