A study published in Science reveals that premature birth fundamentally alters cerebellar growth trajectories rather than simply delaying development. By analyzing 176 living infants alongside cellular tissue from 83 infants using spatial transcriptomics, researchers found that each week outside the womb before term reduces cerebellar volume by approximately 230 cubic millimeters, correlating with motor and cognitive delays at 9 to 36 months. Senior authors Panagiotis Kratimentos and Vittorio Gallo emphasize that post-birth NICU stressors impact this growth, urging precision treatments tailored to developmental maturity rather than chronological age.
Altered cerebellar growth and volume
- ▪The study in Science overturns the long-standing belief that premature infants merely undergo slowed brain growth and catch up in cerebellar development by their original due date.
- ▪A study published in Science demonstrates that premature birth alters the growth and development trajectories of the cerebellum compared to full-term gestation.
- ▪A study published in Science found that each week an infant spends outside the womb before full term is associated with approximately 230 cubic millimeters less cerebellar volume.
Developmental consequences for premature infants
- ▪Research published in Science shows that childhood motor, language, and learning challenges in premature infants can occur without detectable brain injuries.
- ▪A study in Science linked reduced cerebellar volume in preterm infants to developmental delays in movement, language, and thinking skills at 9 to 36 months of age.
Influence of the NICU environment
- ▪While birth timing sets the baseline molecular program, physiological stressors, illness, and specific aspects of care in the neonatal intensive care unit significantly alter cerebellar growth rates.
- ▪Translational neuroscientist Gabriele Simonti stated that molecular programs governing Purkinje and granule cells respond to both birth timing and the post-birth clinical environment.
Recommendations for targeted neuroprotective care
- ▪Neonatologist Panagiotis Kratimentos stated that cellular mapping will allow clinicians to design and time neuroprotective strategies matching the exact biological state of a preterm infant's brain cells in the NICU.
- ▪Senior study author Vittorio Gallo recommended that assessment and neuroprotective treatment of preterm infants be guided by developmental maturity rather than chronological age.
Study methodology and tissue analysis
- ▪Study lead authors Georgios Sanidas and Gabriele Simonti combined multiyear brain imaging and developmental tracking of 176 living infants with cellular analysis of brain tissue from 83 preterm and term infants.
- ▪Researchers used spatial transcriptomics on brain tissue samples from repositories including the NIH NeuroBioBank to map gene activity across Purkinje and granule cells in the cerebellum.
Cerebellar growth in pregnancy
- ▪For full-term infants, the entire rapid development phase of the cerebellum occurs inside the protective environment of the uterus.
- ▪Between 24 and 40 weeks of pregnancy, the human cerebellum undergoes its most rapid growth, expanding fivefold in size as primary neurons wire together.
Study publication and funding
- ▪The study on premature infant brain development was supported by funding from the Raynor Cerebellum Project Foundation.
- ▪The study was published in Science in 2026 under the title Intrinsic gestational timing governs human cerebellar development after preterm birth.
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