Is Picks disease hereditary?

Pick’s disease, a form of frontotemporal dementia (FTD), is considered a hereditary condition in approximately 30% to 50% of cases, where it follows an autosomal dominant inheritance pattern. While many cases appear sporadically without a clear family history, individuals with a known familial mutation have a 50% chance of passing the genetic variant to each of their children.

Is Pick’s disease hereditary or sporadic?

In clinical genetics, we distinguish between "hereditary" (passed down through germline mutations) and "sporadic" (occurring without a clear family history). Pick’s disease is primarily a sporadic condition, meaning most individuals diagnosed do not have an affected parent. However, in families where Pick’s disease is hereditary, the condition is caused by specific genetic mutations—most notably in the MAPT, GRN, or C9orf72 genes. When these mutations are present, the condition follows an autosomal dominant inheritance pattern, meaning only one copy of the mutated gene is required to increase the risk of developing Pick’s disease.

What is the risk for children of an affected parent?

If a parent carries a pathogenic mutation associated with Pick’s disease, there is a 50% probability that each child will inherit the mutation. It is important to note that inheriting the mutation does not guarantee the development of the disease, a concept known as "incomplete penetrance," though it significantly elevates the lifetime risk. In the remaining cases of Pick’s disease, the cause is multifactorial or unknown, involving a complex interplay of environmental factors and genetic susceptibility that is not yet fully understood by current medical research.

How does genetic testing and counseling work for families?

Genetic testing is available for Pick’s disease and is typically recommended when there is a strong family history of dementia or early-onset symptoms. Genetic counseling is a vital step in this process to help families navigate the complex emotional and medical implications of their results. Common considerations in the genetic counseling process include:

• Family History Analysis: Mapping the clinical presentation across generations to determine the likelihood of an inherited mutation.


• Informed Consent: Discussing the implications of knowing one’s genetic status, particularly given the current limitations in preventative treatments for Pick’s disease.


• Reproductive Options: Discussing preimplantation genetic testing (PGT) for those who wish to avoid passing a known mutation to future generations.


• De Novo Mutations: While less common than inherited forms, de novo (spontaneous) mutations can occur, meaning the mutation is not present in either parent’s DNA.

What is the role of the DiseaseMaps community?

Currently, 19 people with Pick’s disease have joined the DiseaseMaps.org community to share their experiences. Engaging with a community of peers can provide invaluable emotional support and practical insights for those navigating the diagnostic process or managing the daily realities of Pick’s disease. Connecting with others who understand the unique challenges of this condition can help reduce the isolation often felt by families facing a potential genetic diagnosis.

Next steps

• Consult with a board-certified clinical geneticist to discuss whether genetic testing is appropriate based on your specific family history.


• Request a referral to a neurologist specializing in neurodegenerative disorders or FTD for a comprehensive clinical assessment.


• Join the DiseaseMaps.org community to connect with other families and stay updated on the latest research developments.


• Speak with a licensed genetic counselor to explore the psychosocial impacts of testing before proceeding with any genetic panels.

Medical disclaimer: This information is for educational purposes only and does 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 Institute of Neurological Disorders and Stroke (NINDS) - Frontotemporal Dementia Information Page.


• NIH Genetic and Rare Diseases Information Center (GARD) - Frontotemporal Dementia.


• Online Mendelian Inheritance in Man (OMIM) - #600274 (Frontotemporal Dementia).


• Orphanet - Rare Disease Database (Frontotemporal Dementia).