For the research, the scientists created a polygenic risk score which estimated the genetic burden of common variants. They gathered data from a previous genome association wide study. Hundreds and thousands of loci that were linked to migraines were incorporated. Researchers then tested the influence of the risk score and the three mendelian linked genes with a large family of migraine sufferers in Finland. They used genetic data of 1589 families compared them to a control family. The researchers found out that time and time again results proved that the polygenic common variants were driving migraine risk way more than the mendelian traits. The end result was that it was more likely the person with the migraine has a greater genetic burden of common polygenic variants to blame.
I believe this research is a good start with good findings to a problem that 15-20% of adults go through. If we can continue to build on research and find out what biological pathways the genes affect than we can find a better solution to a problem that almost a quarter of adults face on a daily basis.