Swiss wine
One grape that DNA analysis has linked to Nosiola is the Swiss wine grape Rèze which is grown in the Valais region. DNA has shown that both Nosiola and Groppello di Revò share a parent-offspring relationship with Rèze and, given that Rèze has been well known and documented nearly five centuries before the other two, it is more likely that Rèze is the parent variety with the other two being offspring.