Compact Calm1 promoter enables AAV mediated neuron-targeted expression in human iPSC-derived brain organoids

Dec 24, 2025Scientific reports

Compact Calm1 promoter allows virus-based gene expression targeting neurons in human stem cell–derived brain models

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Abstract

The compact Calm1 promoter shows comparable performance to the widely used hSyn promoter in human neurons.

  • The Calm1 promoter is 120 bp long, making it a smaller alternative for gene expression in the brain.
  • Both the hSyn and Calm1 promoters demonstrated excitatory and inhibitory neuron-specificity in animal models.
  • Gene expression was evaluated using reporter constructs in human -derived brain organoids.
  • Findings indicate potential for the Calm1 promoter in central nervous system-targeted gene therapies.

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Key numbers

ns
Fluorescence Intensity Comparison
Fluorescence intensity of Calm1 vs. in human neurons
87 days
Organoid Age at Transduction
Age of organoids at the time of transduction

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