New guidance to seekers of autism biomarkers: an update from studies of identical twins.
John N Constantino
PMID 33875018WHAT IT FOUND
This paper offers no new clinical findings.
It is a theoretical review arguing that autism severity varies in identical twins due to non-shared environmental factors, which complicates the search for biological markers. It does not test treatments or provide guidance for direct patient care.
What this paper is
This is a theoretical commentary and review of existing twin studies, not a report of new clinical trial data or patient outcomes. It discusses the genetic and environmental architecture of autism and the challenges of finding biomarkers, but it does not test an intervention or measure clinical results. Therefore, there are no findings here to change your practice on.
Declared interests
Funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development.
The easy way to misread this
Do not interpret the discussion of twin discordance as evidence that specific environmental exposures (like head trauma or infection) cause autism in individual patients. The paper reviews theoretical models of causation and biomarker validity, not clinical risk factors or treatment efficacy.