Anomalous brain functional connectivity contributing to poor adaptive behavior in Down syndrome

Area of Science:

• Neuroscience
• Genetics
• Medical Imaging

Background:

• Down syndrome research has advanced molecular understanding but lacks insight into brain functional organization.
• Gene overexpression in Down syndrome has known molecular effects, but consequences on brain-wide functional networks are unclear.

Purpose of the Study:

• To investigate brain functional organization in Down syndrome using functional connectivity MRI.
• To identify specific brain regions with anomalous synchrony and assess their link to adaptive behaviors.

Main Methods:

• Functional connectivity MRI (fcMRI) was used to generate resting-state whole-brain connectivity maps.
• 20 individuals with Down syndrome and 20 controls were analyzed.
• Region-of-interest mapping detailed anomalies and their correlation with adaptive behavior.

Main Results:

• Down syndrome individuals exhibited increased connectivity in ventral systems (amygdala, anterior temporal lobe, ventral cingulate/frontal cortices).
• Decreased functional connectivity was observed in dorsal executive networks (dorsal prefrontal, anterior cingulate, posterior insula).
• Both increased and decreased connectivity anomalies correlated with adaptive communication skills.

Conclusions:

• Down syndrome is associated with a distinct brain functional organization featuring system-specific anomalies.
• These connectivity differences contribute to reduced adaptive efficiency and align with the known cognitive profile of Down syndrome.
• Connectivity changes may serve as biomarkers for developing therapeutic strategies to improve quality of life.