Is Fabry disease hereditary?

TL;DR: Yes, Fabry disease is a hereditary condition caused by a genetic mutation on the X chromosome, meaning it is passed down from parents to children in an X-linked inheritance pattern. Because it is X-linked, the risk of transmission depends on the sex of the parent and the sex of the child, and genetic testing is the definitive method for diagnosis and family planning.

Is Fabry disease hereditary?

Fabry disease is both a genetic and hereditary condition. It is "genetic" because it is caused by a permanent change (mutation) in the GLA gene, which provides instructions for making the enzyme alpha-galactosidase A. It is "hereditary" because this mutation is passed from parents to children through their DNA. In the 174 members of the DiseaseMaps community currently navigating this diagnosis, we see how these hereditary patterns impact multiple generations, highlighting the importance of understanding your family history.

What is the inheritance pattern of Fabry disease?

Fabry disease follows an X-linked inheritance pattern. The GLA gene is located on the X chromosome. Because males have only one X chromosome (XY), they are typically more severely affected if they inherit a mutated copy. Females have two X chromosomes (XX), and while they were historically considered "carriers," we now know that females with Fabry disease can experience significant, life-altering symptoms due to the process of X-inactivation.

• If a father has Fabry disease: He will pass his mutated X chromosome to all of his daughters (who will become carriers or affected) and his Y chromosome to all of his sons (who will not inherit the disease).


• If a mother has Fabry disease: There is a 50% chance for each pregnancy that she will pass the mutated X chromosome to her child, regardless of whether the child is male or female.

Are de novo mutations common in Fabry disease?

While most cases of Fabry disease are inherited from an affected parent, de novo (spontaneous) mutations do occur. A de novo mutation means the genetic change appeared for the first time in an individual due to a random error during the formation of reproductive cells or early embryonic development. While these cases are less common than familial inheritance, they are well-documented in clinical literature and mean that a person can have Fabry disease even if there is no prior family history of the condition.

How is genetic testing used for diagnosis and family planning?

Genetic testing is the gold standard for confirming a diagnosis of Fabry disease. It involves sequencing the GLA gene to identify pathogenic variants. Once a specific mutation is identified in an index patient, genetic counseling is highly recommended. Genetic counselors can help families understand the inheritance risks, interpret test results, and discuss reproductive options. For those planning a family, options such as preimplantation genetic testing (PGT) or prenatal diagnosis (like amniocentesis or chorionic villus sampling) may be available to identify whether an embryo or fetus carries the GLA mutation.

Next steps

• Consult with a clinical geneticist or a metabolic specialist to confirm your GLA mutation status.


• Request a referral for genetic counseling to create a family pedigree and identify at-risk relatives who may need screening.


• Connect with the 174 members of the DiseaseMaps Fabry disease community to share experiences and find peer support.


• Review your family medical history to identify symptoms in relatives that may suggest undiagnosed Fabry disease.

Medical disclaimer: This content is for informational purposes only and does not constitute 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

• Orphanet: Fabry Disease


• NIH Genetic and Rare Diseases (GARD) Information Center


• OMIM (Online Mendelian Inheritance in Man): Alpha-Galactosidase A Deficiency


• National Fabry Disease Foundation