Is Birt-Hogg-Dubé syndrome contagious?

Birt-Hogg-Dubé syndrome is a strictly genetic condition caused by mutations in the FLCN gene and is not contagious in any way. You cannot catch Birt-Hogg-Dubé syndrome through physical contact, sharing personal items, or being in the same room as someone who has the condition.

What causes Birt-Hogg-Dubé syndrome?

Birt-Hogg-Dubé syndrome (BHD) is an autosomal dominant genetic disorder. This means it is caused by a permanent change, or mutation, in the FLCN gene, which provides instructions for making a protein called folliculin. This protein is thought to act as a tumor suppressor. When the FLCN gene is mutated, the body's ability to regulate cell growth is impaired, which can lead to the development of skin lesions, lung cysts, and an increased risk of kidney tumors. Because Birt-Hogg-Dubé syndrome is hard-wired into a person's DNA from conception, it is biologically impossible for it to be transmitted to others.

Why is there confusion about the transmission of Birt-Hogg-Dubé syndrome?

Because Birt-Hogg-Dubé syndrome often manifests with visible skin bumps (fibrofolliculomas) on the face, neck, and upper torso, some individuals may mistakenly fear these skin findings are infectious or contagious. These bumps are simply benign growths of the hair follicles, not rashes, viral warts, or infections. Furthermore, because Birt-Hogg-Dubé syndrome is rare, many people—including some medical professionals—may be unfamiliar with the condition. This lack of awareness can lead to unnecessary social stigma or isolation for those living with the diagnosis. It is important to emphasize that there is zero risk of transmission through touch, saliva, or any other form of contact.

Are there environmental triggers for Birt-Hogg-Dubé syndrome?

While the underlying cause of Birt-Hogg-Dubé syndrome is genetic, certain environmental factors can influence the severity of the symptoms. For instance, individuals with Birt-Hogg-Dubé syndrome are at an increased risk for pneumothorax (collapsed lung) due to the presence of lung cysts. While the cysts themselves are a direct result of the FLCN gene mutation, their stability can be affected by external factors. Patients are generally advised to avoid activities that involve rapid changes in air pressure, such as scuba diving, to minimize the risk of a pneumothorax. However, these are management strategies for the disease, not indicators of contagion.

Key facts about Birt-Hogg-Dubé syndrome

• Genetic Inheritance: Birt-Hogg-Dubé syndrome follows an autosomal dominant pattern, meaning a child of an affected parent has a 50% chance of inheriting the mutation.


• Non-Infectious Nature: Birt-Hogg-Dubé syndrome cannot be spread through casual contact, kissing, or sharing living spaces.


• Clinical Presentation: Skin lesions typically appear in the third or fourth decade of life, though they are not present in every single person with the FLCN mutation.


• Community Support: Currently, 114 people with Birt-Hogg-Dubé syndrome have joined the DiseaseMaps community to share experiences and reduce the isolation often caused by misconceptions.

Next steps

• Consult with a clinical geneticist to understand your specific FLCN mutation and family risk profile.


• Speak with a dermatologist if you are concerned about the visibility of skin manifestations associated with Birt-Hogg-Dubé syndrome.


• Connect with the 114 members of the DiseaseMaps community to share personal experiences and find emotional support.


• Work with a urologist to establish a surveillance plan for kidney health, as this is a standard proactive measure for those with Birt-Hogg-Dubé syndrome.

Medical disclaimer: This information is for educational purposes only and should not replace professional medical advice, diagnosis, or treatment; always seek the guidance of a qualified physician regarding any medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Birt-Hogg-Dubé syndrome


• Orphanet: Birt-Hogg-Dubé syndrome (ORPHA:1204)


• Online Mendelian Inheritance in Man (OMIM): #135150 (Birt-Hogg-Dubé syndrome)


• The BHDS Foundation: Understanding the genetic basis of the disease