Molecular and cellular processes disrupted in the early postnatal Down syndrome prefrontal cortex

Area of Science:

• Neuroscience
• Genetics
• Developmental Biology

Background:

• Down syndrome (DS) is the leading genetic cause of intellectual disability.
• Neurodevelopmental impairments in DS, including motor, cognitive, and language delays, have poorly understood molecular underpinnings.
• Early postnatal development is critical for brain maturation, synaptogenesis, and neuroimmune interactions.

Purpose of the Study:

• To investigate the molecular mechanisms of neurodevelopmental impairments in the Down syndrome prefrontal cortex during early postnatal development.
• To create a molecular atlas of Down syndrome neuropathology at a key developmental stage.

Main Methods:

• Single-nucleus multiomic sequencing was employed to simultaneously profile gene expression and chromatin accessibility.
• The study focused on the prefrontal cortex during early postnatal development in Down syndrome.

Main Results:

• Widespread dysregulation of chromatin accessibility and gene expression was observed in the Down syndrome brain.
• Deficits were identified in metabolic and synaptic pathways, oligodendrocyte lineage progression, and a significant neuroinflammatory signature.
• Convergent neurodevelopmental and neurodegenerative pathways were highlighted.

Conclusions:

• The study provides a molecular atlas of Down syndrome neuropathology during a critical brain development period.
• Findings implicate neuroinflammation and synaptic deficits as key features of Down syndrome brain development.
• The identified pathways offer potential targets for novel therapies for Down syndrome-associated neuroinflammation.