Is Pulmonary Hypertension hereditary?

Pulmonary hypertension is not always hereditary, but it can have a genetic component, particularly in cases classified as Heritable Pulmonary Arterial Hypertension (HPAH). While many cases are idiopathic (spontaneous) or secondary to other conditions, a subset of patients carries specific gene mutations, most commonly in the BMPR2 gene, which follows an autosomal dominant inheritance pattern.

Is pulmonary hypertension hereditary or genetic?

There is an important clinical distinction between "genetic" and "hereditary." A condition is genetic if it is caused by changes in DNA, while it is hereditary if those changes are passed from parent to child. Pulmonary hypertension can be both. While the majority of cases are not inherited, HPAH is a specific form of pulmonary hypertension that is caused by a germline mutation. In these families, the condition can be passed down through generations, though not everyone who inherits a mutation will develop the disease, a phenomenon known as incomplete penetrance.

What is the inheritance pattern and risk for family members?

When pulmonary hypertension is caused by a mutation in the BMPR2 gene, it typically follows an autosomal dominant inheritance pattern. This means an affected parent has a 50% chance of passing the mutation to each child. However, because the penetrance is estimated to be only 20% to 30%, many individuals who carry the BMPR2 mutation never manifest symptoms of pulmonary hypertension. Other less common genes, such as ACVRL1 or ENG, are also associated with hereditary forms of the disease.

Are de novo mutations common in pulmonary hypertension?

Yes, de novo mutations—meaning a new genetic change that occurs for the first time in an individual and is not inherited from either parent—are observed in pulmonary hypertension. For patients who do not have a family history of the disease, genetic testing may reveal a de novo mutation. This is an important consideration for families who may be concerned about recurrence risks in future pregnancies.

When is genetic testing and counseling recommended?

Genetic testing for pulmonary hypertension is generally recommended for patients with a family history of the disease or those diagnosed with idiopathic pulmonary arterial hypertension at a young age. Genetic counseling is a critical component of this process to help families understand the following:

• The distinction between carrying a mutation and developing the clinical disease.


• The limitations of current genetic testing, as not all cases of pulmonary hypertension have a known genetic cause.


• Reproductive options, including preimplantation genetic testing (PGT) for those who wish to avoid passing a known mutation to their offspring.


• The psychological impact of learning one’s genetic status and the importance of ongoing clinical monitoring.

Next steps

• Consult with a specialized pulmonary hypertension center to discuss if genetic testing is appropriate for your specific clinical profile.


• Request a referral to a certified genetic counselor to map your family history and discuss inheritance risks.


• Join the Pulmonary Hypertension community at DiseaseMaps.org to connect with 101 other members who share experiences and insights on managing this complex condition.


• Ensure that first-degree relatives are aware of the potential for familial risk if a pathogenic mutation is identified.

Medical disclaimer: This information is for educational purposes only and does not constitute 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

• NIH Genetic and Rare Diseases Information Center (GARD): Pulmonary Arterial Hypertension.


• Orphanet: Heritable pulmonary arterial hypertension (ORPHA:64761).


• OMIM (Online Mendelian Inheritance in Man): Pulmonary Hypertension, Primary, 1; PPH1.


• Pulmonary Hypertension Association: Understanding the Genetics of PAH.