CDKL5 sculpts functional callosal connectivity to promote cognitive flexibility
Patricia Nora Awad1, Valerio Zerbi2,3,4, Erin M Johnson-Venkatesh1
1F. M. Kirby Neurobiology Center, Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA, USA.
Molecular Psychiatry
|February 3, 2023
Summary
CDKL5 Deficiency Disorder (CDD) in mice shows increased brain connectivity and cognitive deficits. Restoring CDKL5 in callosal projection neurons (CPNs) reversed these impairments, highlighting CPNs
Area of Science:
- Neuroscience
- Genetics
- Developmental Biology
Background:
- Neurodevelopmental disorders (NDDs) often involve altered brain connectivity.
- Interhemispheric connections via callosal projection neurons (CPNs) are crucial for cognition.
- The role of CPNs in NDDs and their causal link to cognitive deficits remain unclear.
Purpose of the Study:
- Investigate the causal relationship between CPN dysfunction and cognitive deficits in CDKL5 Deficiency Disorder (CDD).
- Determine the role of CDKL5 in regulating CPN connectivity and cognitive function.
Main Methods:
- Resting-state functional MRI (rs-fMRI) in CDKL5-deficient mice.
- Analysis of synaptic connectivity in the cingulate cortex.
- Genetic manipulation of CDKL5 expression in CPNs.
Main Results:
- CDKL5 deficiency led to increased interhemispheric connectivity and cognitive impairments in mice.
- Synaptic alterations in CPNs were observed, with increased callosal inputs and decreased local connectivity.
- Selective deletion or re-expression of CDKL5 in CPNs directly impacted cognitive function.
Conclusions:
- CDKL5 is essential for proper CPN development and function.
- CPN dysfunction is causally linked to cognitive deficits in CDD.
- Targeting CPNs may offer therapeutic strategies for NDDs.
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