eLife assessment
The findings are important and would potentially have theoretical and practical implications outside the field. However the strength of evidence presented was assessed as being incomplete in several respects. Major strengths are (1) genetic factors in facial appearance are of broad interest, and the potential influence of possibly identical factors in a serious congenital disorder (cleft lip/palate) heightens that interest further; (2) proving which single nucleotide variants influence phenotypes, and by what mechanisms, is a major challenge for the field as a whole. The weakness, as assessed, was that in its present form the experimental approach was not sufficiently rigorous to support the conclusions unambiguously.