In 2006, DNA profiling suggested a parent-offspring relationship between Carignan and the Rioja wine grape Graciano though it was not yet clear which variety is the parent and which is the offspring. However, some grape geneticist and ampelographers such as José Vouillamoz dispute the 2006 findings and believe that the DNA profiles of both grapes are too distinct to have a close parent-offspring relationship at all. It is more likely, Vouillamoz and others suggest, that Carignan and Graciano were the result of two separate spontaneous crossings of unknown "Vitis vinifera" parents that occurred somewhere in northeast Spain.