Genna, who is living with a rare genetic form of Parkinson’s, and Miratul, a consultant neurologist, talked to us about genetics and Parkinson’s. If you have Parkinson's, it's likely you have idiopathic Parkinson's. This means it isn't known what has caused the condition. But for some, differences in certain genes will have contributed to increasing their risk of developing the condition and in rarer cases directly caused their Parkinson’s. This is more common in those diagnosed before 50 or wit