What is the role of genetics in pediatric Crohn disease?

Updated: Oct 23, 2018
  • Author: Andrew B Grossman, MD; Chief Editor: Carmen Cuffari, MD  more...
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A high rate of concordance for Crohn disease between monozygotic twins (44.4%) compared with dizygotic twins (3.8%) was reported in a Swedish study of an unselected twin registry. [9] Because monozygotic twins share identical genomic material and yet may be discordant for Crohn disease, the genetic component is necessary but not sufficient, as in all multifactorial diseases.

About 30% of patients whose disease is diagnosed when they are younger than 20 years have a positive family history. The percentage decreases to 18% for patients whose disease is diagnosed at age 20-39 years and to 13% after age 40 years.

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