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Adult-onset citrullinemia type II

Other Names for this Disease
  • Adult-onset citrullinemia type 2
  • Citrin deficiency
  • Citrullinemia type 2
  • Citrullinemia type II
  • CTLN2
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Adult-onset citrullinemia type II is an inherited disorder that causes ammonia and other toxic substances to accumulate in the blood. The condition chiefly affects the nervous system, causing confusion, restlessness, memory loss, abnormal behaviors (such as aggression, irritability, and hyperactivity), seizures, and coma. These signs and symptoms can be life-threatening. The signs and symptoms appear during adulthood and are triggered by certain medications, infections, surgery, and alcohol intake. The features of adult-onset type II citrullinemia may also develop in people who as infants had a liver disorder called neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD). In many cases, the signs and symptoms of NICCD resolve within a year. Years or even decades later, however, some of these people develop the characteristic features of adult-onset type II citrullinemia. Adult-onset citrullinemia type II is caused by mutations in the SLC25A13 gene. This condition is inherited in an autosomal recessive pattern.[1]
Last updated: 7/11/2011


  1. Citrullinemia. Genetics Home Reference (GHR). 2006; Accessed 7/11/2011.
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  • Genetics Home Reference (GHR) contains information on Adult-onset citrullinemia type II. This website is maintained by the National Library of Medicine.
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  • The Online Mendelian Inheritance in Man (OMIM) is an catalog of human genes and genetic disorders. Each entry has a summary of related medical articles. It is meant for health care professionals and researchers. OMIM is maintained by Johns Hopkins University School of Medicine. 
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