The original paper is https://www.cell.com/cell/fulltext/S0092-8674(17)30629-3 There was a nice follow up last week https://www.cell.com/cell/abstract/S0092-8674(18)30714-1 There's a lot of good theoretical biology to be done here. I don't think any of us systems biologists are surprised about this result, but pinning down exactly the structure of the genetic basis for complex traits is going to be an interesting enterprise.