Neuronal Morphogenesis And Circuit Formation In Autism Spectrum Disorders

My laboratory has a long-term interest in exploring how genes control neuronal morphology and activity and thereby regulate neural circuit formation and behaviors. We have been focusing on causative genes for neurodevelopmental disorders (ND), especially autism spectrum disorders (ASD) because ASD arises from aberrant neural development, which consequently results in abnormal neural connectivity. We have been using genetically modified mouse models and cultured hippocampal and cortical neurons to investigate how mutations of causative genes for ASD lead to altered neuronal morphology and function and abnormal mouse behaviors. We adopt multiple different experimental systems for our research. First, we apply biochemical and cell biology approaches to investigate the protein-protein interactions and subcellular distributions of target proteins in neurons. Based on results from cultured neurons and data on mutations in patients, we establish mouse genetic models to characterize the functions of those proteins in controlling brain anatomy and mouse behaviors. We then use electrophysiological recording, optogenetic and chemogenetic approaches to investigate how those proteins control neuronal activity and circuits. To validate the molecular mechanisms we identify, we always conduct rescue experiments as a follow-up. Importantly, those rescue experiments often provide useful information on potential therapeutic agents for autism. In the future, we wish to pursue this research direction further to investigate how ASD-linked genes control neuronal morphology and circuits. Given that ASD is male-biased, we will also investigate what factors contribute to the sex bias of ASD, shedding further light on its molecular etiology.

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Hsueh, Yi-Ping