We don't yet know what factors determine whether people with...

We don't yet know what factors determine whether people with this genetic variation do or don't end up with dyslexia, ... A host of environmental and genetic influences likely influences or determines whether somebody with this particular genetic variation ends up being dyslexic or not. And until the nature of some of those other influences is fully specified, we won't know what it means to say to somebody that their 5-year-old child has this particular genetic endowment.