In conclusion, the GWAS performed so far in ADHD, though far from conclusive, provide a first glimpse at genes for the disorder. Many more (much larger studies) will be needed. For this, collaboration between researchers as well as standardized protocols for phenotyping and DNA-collection will become increasingly important. Furthermore, understanding how the genes identified by GWAS contribute to ADHD risk, will require smart biological experiments facing the challenge of an organ as inaccessible and complex as the human brain.
