Exploring the mechanisms underlying excitation/inhibition imbalance in human iPSC-derived models of ASD.
Lorenza Culotta, Peter Penzes
PMID 32393347WHAT IT FOUND
Human stem cell-derived neurons with autism-related genetic variants show altered excitatory and inhibitory activity.
The direction varies by gene and model, so these laboratory findings do not establish patient-level effects.
Key findings
01SHANK2 mutant neurons showed increased dendrite branching, synapse number, and spontaneous excitatory currents, while SHANK3 mutations were associated with lowered connectivity.
02TSC studies reported opposite excitability findings: reduced excitability in TSC2-deficient neurons, but increased calcium events, activity, and synchrony in others.
03Telencephalic organoids from ASD patients showed altered neuronal differentiation and synaptic formation, with enhanced GABAergic differentiation, which together resulted in an excitation-inhibition imbalance.
STILL TO COME
How it was doneWhat they found
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What it does not show
The paper reviews cellular models and does not report patient outcomes. Findings varied across genes and models, and some TSC studies reported opposite effects. The authors note technical limitations of stem cell models, such as experimental variability, cellular heterogeneity, and lack of some brain cell types.
Declared interests
The paper names funding from the National Institutes of Health. No other conflict statement is included.
The easy way to misread this
Do not read these cellular findings as evidence that autism is caused by an excitation-inhibition imbalance in patients or that correcting it would improve behaviour. The paper reports stem cell-derived models and genetic manipulations, not clinical outcomes.