Genetic counselling for risk of Parkinson’s disease in patients with Gaucher disease Type 1 and carriers of GBA1 mutations
It is well established in the scientific literature that patients with Gaucher disease Type 1 and carriers of the disease have an increased risk for developing Parkinson’s disease (see neurological disorders).3,4 Over the past decade, information about this link has been reported by the mainstream media and is freely available online to patients.5 To ensure that this risk is communicated in a timely fashion to patients and in the correct setting, genetic counsellors and healthcare professionals will need to decide when to discuss the risk of Parkinson’s disease with patients who have Gaucher disease and also those who are carriers of the GBA1 mutation. It is also important to understand the reasons behind whether these patients want to be told of their risk.5,6
To assess whether there is a knowledge gap between the risk of Parkinson’s disease reported in the scientific literature and the counselling of patients with Gaucher disease, a survey of 125 adult patients with Gaucher disease Type 1 was conducted. Of these 125 patients, 80.0% (n=100) reported having known about the increased risk of developing Parkinson's disease prior to taking the survey. Most patients (87.0%) learned about the increased risk after their initial diagnosis, and 90.0% reported that they had made no medical or lifestyle changes based on this knowledge. When participants were asked what they felt was the ideal way, and when they felt was the ideal time, to find out about their increased risk for Parkinson’s disease, 83.7% of patients agreed that the best way to find out was from their healthcare provider, and 71.0% of participants agreed that the increased risk should be disclosed at the time of Gaucher disease diagnosis.5
In a US survey of prospective parents who were being carrier tested for Gaucher disease, those who screened negative for the GBA1 mutation (n=75) were asked if they would want to learn about their own risk for developing Parkinson’s disease (only non-carriers of Gaucher disease were surveyed, to ensure that participants would not learn unwanted information about their own health by taking part in the study).6