The world’s undiagnosed Marfan patients often go through life unaware of the hidden killer lurking in their DNA – a gene variant which may lead to sudden death at any moment via an aortic dissection. Currently, there is no therapy available to counteract this disastrous aortic event, so patient awareness of their condition is key to prevention. To learn more about Marfan syndrome and improve diagnosis, our project needs patients to enroll online in our research cohort. In this way, patients themselves can help us contribute to new therapies and avert sudden deaths.