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Published on: April 20, 2018
Dissecting the molecular basis of human interneuron migration in forebrain assembloids from Timothy syndrome
Fikri Birey1, Min-Yin Li1, Aaron Gordon2
1Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA; Stanford Brain Organogenesis, Wu Tsai Neurosciences Institute, Stanford University, Stanford, CA 94305, USA.
Defects in human cortical interneuron migration, seen in Timothy syndrome, involve L-type calcium channel (LTCC) Cav1.2 function. Strategies targeting actomyosin and GABA pathways may restore migration and network activity.
Area of Science:
- Neuroscience
- Developmental Biology
- Genetics
Background:
- Defects in interneuron migration disrupt cortical circuit assembly, contributing to neuropsychiatric disorders.
- Timothy syndrome (TS) exhibits interneuron migration defects linked to mutations in the L-type calcium channel (LTCC) Cav1.2.
Purpose of the Study:
- To investigate the role of LTCC Cav1.2 in regulating interneuron migration in TS.
- To identify molecular mechanisms underlying migration defects and hypersynchronous network activity in TS.
- To explore therapeutic strategies for restoring interneuron migration and network function in TS.
Main Methods:
- Utilized forebrain assembloids from integrated cortical and ventral forebrain organoids.
- Employed pharmacological modulation of LTCC Cav1.2.
- Analyzed actomyosin dynamics and myosin light chain (MLC) phosphorylation.
- Assessed γ-aminobutyric acid (GABA) sensitivity and GABA-A receptor antagonism.
- Measured hypersynchronous human cortical slice (hCS) network activity.
Main Results:
- LTCC Cav1.2 modulation affected interneuron saltation length but not frequency in TS.
- Saltation length defects correlated with aberrant actomyosin and MLC phosphorylation.
- Saltation frequency defects were linked to enhanced GABA sensitivity, responsive to GABA-A receptor antagonism.
- TS exhibited hypersynchronous hCS network activity, worsened by interneuron migration.
Conclusions:
- LTCC Cav1.2 plays a complex role in human cortical interneuron migration.
- Aberrant actomyosin dynamics and GABAergic signaling contribute to TS-related migration defects.
- Targeting LTCCs, actomyosin pathways, and GABAergic signaling offers potential therapeutic avenues for TS.
