"We found a genetic marker for X" is even more fuzzy when talking about something like Schizophrenia or Autism, because the diagnosis itself is very far from a

"We found a genetic marker for X" is even more fuzzy when talking about something like Schizophrenia or Autism, because the diagnosis itself is very far from a precise label. It's not just about missing environmental contributions or dealing with how complex interactions between different generic markers are, though these are also issues. We're averaging over probably dozens of different issues in the vast majority of studies, and that extends to other subfields of biological psychiatry too.