Harlequin ichthyosis

What causes harlequin ichthyosis?

Harlequin ichthyosis is caused by mutations in the ABCA12 _gene. This gene provides instructions for making a protein that is essential for the normal development of skin cells. This protein plays a major role in the transport of fats (lipids) in the outermost layer of skin (the epidermis). Some mutations in the _ABCA12 gene prevent the cell from making any ABCA12 protein, while others lead to the production of an abnormally small version of the protein that cannot transport lipids properly. A loss of functional ABCA12 protein disrupts the normal development of the epidermis, resulting in the hard, thick scales characteristic of harlequin ichthyosis.

Last updated on 05-01-20

Can harlequin ichthyosis be diagnosed before birth using amniocentesis or chorionic villus sampling?

Yes, harlequin ichthyosis can be diagnosed before birth using either amniocentesis or chorionic villus sampling. Both of these procedures are used to obtain a sample of fetal DNA, which can be tested for mutations in the ABCA12 gene. The Genetic Testing Registry (GTR) provides information about the genetic tests for this condition. The intended audience for the GTR is health care providers and researchers. Patients and consumers with specific questions about a specific genetic test should contact a health care provider or a genetics professional.

Last updated on 05-01-20

How is harlequin ichthyosis inherited?

Harlequin ichthyosis is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

Last updated on 05-01-20

Name: Foundation for Ichthyosis and Related Skin Types FIRST 2616 North Broad Street
Colmar, PA, 18915 , United States
Phone: +1-215-997-9400 Toll Free: 1-800-545-3286 Email: info@firstskinfoundation.org Url: http://www.firstskinfoundation.org/

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The RareGuru disease database is regularly updated using data generously provided by GARD, the United States Genetic and Rare Disease Information Center.

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