Is Dubin-Johnson syndrome hereditary?

TL;DR: Dubin-Johnson syndrome is a hereditary condition, meaning it is passed down through families due to specific genetic changes. It follows an autosomal recessive inheritance pattern, which requires a child to inherit one mutated copy of the ABCC2 gene from each parent to manifest the condition.

Is Dubin-Johnson syndrome hereditary?

Yes, Dubin-Johnson syndrome is a strictly hereditary, autosomal recessive disorder. This means it is caused by mutations in the ABCC2 gene, which provides instructions for making a protein that transports bile pigments out of liver cells. Because it is recessive, individuals who have only one mutated copy of the gene are considered carriers; they do not typically show symptoms of Dubin-Johnson syndrome but can pass the mutation to their children. Only when both parents are carriers is there a risk of having an affected child.

What is the risk of passing Dubin-Johnson syndrome to children?

When both parents are carriers of the ABCC2 mutation, the probability of passing Dubin-Johnson syndrome to their offspring follows these Mendelian statistics for each pregnancy:

• 25% chance the child will have Dubin-Johnson syndrome (inheriting two mutated copies).


• 50% chance the child will be an asymptomatic carrier (inheriting one mutated copy).


• 25% chance the child will inherit two normal copies of the gene and be neither affected nor a carrier.

If only one parent is a carrier and the other does not carry the mutation, there is no risk of the child having the condition, though there is a 50% chance the child will also be a carrier.

How is genetic testing used for this condition?

Genetic testing is the definitive way to confirm a diagnosis of Dubin-Johnson syndrome. While the condition is often suspected due to elevated conjugated bilirubin levels and the characteristic dark pigmentation of the liver, molecular genetic testing via sequencing of the ABCC2 gene confirms the presence of pathogenic variants. Testing is recommended for individuals presenting with unexplained jaundice or those with a family history of the condition. Because Dubin-Johnson syndrome is a relatively benign, chronic condition, prenatal diagnosis is rarely sought, but it is technically possible through amniocentesis or chorionic villus sampling if both parental mutations are known.

Are de novo mutations common in Dubin-Johnson syndrome?

De novo (spontaneous) mutations—where a child is born with the condition despite neither parent being a carrier—are extremely rare in Dubin-Johnson syndrome. In the vast majority of cases, the condition is inherited from parents who are themselves carriers. The rarity of de novo cases emphasizes the importance of family history and genetic counseling for siblings and extended relatives of an affected individual.

The role of genetic counseling for families

Genetic counseling is highly recommended for families affected by Dubin-Johnson syndrome. A genetic counselor can help clarify the inheritance risks, interpret test results, and provide guidance for family members who may be carriers. For those planning a family, counseling provides a space to discuss testing options and the benign nature of this specific liver condition, which often helps alleviate anxiety regarding the child's long-term prognosis.

Next steps

• Consult with a clinical geneticist or a hepatologist to discuss diagnostic molecular testing.


• Request a family pedigree analysis to identify other relatives who may be carriers.


• Connect with the DiseaseMaps.org community to share experiences with others living with rare liver conditions.


• Discuss reproductive options, such as carrier screening, with a certified genetic counselor if you have a family history of the disorder.

Medical Disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment; always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• National Institutes of Health (NIH) Genetic and Rare Diseases Information Center (GARD): Dubin-Johnson syndrome.


• Orphanet: Dubin-Johnson syndrome (ORPHA:258).


• Online Mendelian Inheritance in Man (OMIM): Dubin-Johnson syndrome (#237500).