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iPSC-derived models of PACS1 syndrome reveal transcriptional and functional deficits in neuron activity

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  • Lauren Rylaarsdam

    (Northwestern University)

  • Jennifer Rakotomamonjy

    (Northwestern University)

  • Eleanor Pope

    (Northwestern University)

  • Alicia Guemez-Gamboa

    (Northwestern University)

Abstract

PACS1 syndrome is a neurodevelopmental disorder characterized by intellectual disability and distinct craniofacial abnormalities resulting from a de novo p.R203W variant in phosphofurin acidic cluster sorting protein 1 (PACS1). PACS1 is known to have functions in the endosomal pathway and nucleus, but how the p.R203W variant affects developing neurons is not fully understood. Here we differentiated stem cells towards neuronal models including cortical organoids to investigate the impact of the PACS1 syndrome-causing variant on neurodevelopment. While few deleterious effects were detected in PACS1(+/R203W) neural precursors, mature PACS1(+/R203W) glutamatergic neurons exhibited impaired expression of genes involved in synaptic signaling processes. Subsequent characterization of neural activity using calcium imaging and multielectrode arrays revealed the p.R203W PACS1 variant leads to a prolonged neuronal network burst duration mediated by an increased interspike interval. These findings demonstrate the impact of the PACS1 p.R203W variant on developing human neural tissue and uncover putative electrophysiological underpinnings of disease.

Suggested Citation

  • Lauren Rylaarsdam & Jennifer Rakotomamonjy & Eleanor Pope & Alicia Guemez-Gamboa, 2024. "iPSC-derived models of PACS1 syndrome reveal transcriptional and functional deficits in neuron activity," Nature Communications, Nature, vol. 15(1), pages 1-18, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-44989-7
    DOI: 10.1038/s41467-024-44989-7
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