Harvard Keeps 1 Million-Cell Brain Organoids Alive 5 Years, Tripling 694-Day Record
Updated
Updated · current.fas.harvard.edu · Aug 19
Harvard Keeps 1 Million-Cell Brain Organoids Alive 5 Years, Tripling 694-Day Record
3 articles · Updated · current.fas.harvard.edu · Aug 19
Summary
More than 34 Harvard-grown brain organoids survived over five years in culture, letting researchers track human cerebral cortex development far beyond the early stages most lab models reach.
Single-cell RNA sequencing across eight timepoints showed the organoids mirrored gestation and early-life brain development, while DNA methylation patterns followed the same age clock seen in human brains.
Mixed-age cell experiments found older progenitors skipped straight to later-stage neuron production, indicating the organoids retain a developmental memory that records time.
A revised culture medium boosted fragile neuron survival: within nine months neurons increased and synapses thickened, and after one year all organoids in the new medium showed vigorous electrical bursts.
The Nature study points to longer-window models for brain development, disease and drug testing, though the team says the next goal is speeding key maturation phases rather than simply extending longevity.