Cellular and molecular characterization of multiplex autism in human induced pluripotent stem cell-derived neurons.
Emily M A Lewis, Kesavan Meganathan, Dustin Baldridge and 5 others
PMID 31893020WHAT IT FOUND
Cells from three family members with autism showed increased cell death and altered gene expression compared to unaffected controls.
This cellular difference tracked with symptom severity, suggesting stem cell models can reveal biological mechanisms in complex, non-single-gene autism cases.
Key findings
01Neural progenitor cells from affected family members showed increased apoptosis and smaller neurospheres during differentiation compared to unaffected controls.
02Gene expression profiles in affected individuals differed significantly from controls, involving networks related to behavior, learning, and nervous system development.
03Specific gene expression changes correlated with the severity of autism symptoms, distinguishing the severely affected proband from the moderately affected sister.
STILL TO COME
How it was doneWhat they found
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What it does not show
The study includes only one family (three related individuals) and one unrelated control, so findings cannot be generalized to the broader autism population. The genetic cause of autism in this family is complex and polygenic, with no single mutation identified as the sole cause. In vitro cell models cannot fully replicate the complex environment of the developing human brain, including fetal and post-natal interactions. The unrelated control line showed signs of X-chromosome erosion, which could confound some gene expression comparisons, though the authors state this had minimal impact.
Declared interests
The study was funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development, the National Institute of General Medical Sciences, the March of Dimes Foundation, and the National Institutes of Health.
The easy way to misread this
Do not interpret these cellular differences as a diagnostic tool or a direct cause of autism in patients. This is a mechanistic study in a single family showing that lab-grown neurons behave differently; it does not prove that these specific gene changes cause autism or that they apply to other individuals with similar diagnoses.