Prospective Multicenter Study on the Identification of Genetic Abnormalities Predisposing to Vasospasm From a Privileged Model: the Primary Raynaud's Phenomenon

"Such an approach allows to highlight chromosomal regions shared only by individuals within a family and thus highlight the genetic mutations causing the Raynaud phenomenon . The ultimate goal is to identify new pathways involved in vasospasm.~Patients with primary Raynaud phenomenon will be identified during a consultation of vascular medicine and internal medicine in one of the centers participating to the study. Those patients with a primary PR will be considered as Index cases.~The investigators will conduct genealogical trees of index cases to identify families, whose number of healthy individuals and those with relevant PR makes sense for a family genetic study, i.e. a genetically informative family."