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p35 and p39 are essential for cyclin-dependent kinase 5 function during neurodevelopment.
1Department of Pathology and Howard Hughes Medical Institute, Harvard Medical School, Boston, Massachusetts 02115, USA.
Summary
Cyclin-dependent kinase 5 (Cdk5) is crucial for brain development. Its activators, p35 and p39, are essential, with combined deficiencies causing severe developmental defects similar to Cdk5 loss.
Area of Science:
- Neuroscience
- Molecular Biology
- Developmental Biology
Background:
- Cyclin-dependent kinase 5 (Cdk5) is vital for brain development and neuronal migration.
- Cdk5 activation relies on neuronal-specific activators p35 and p39.
- Discrepancies in Cdk5 and p35 deficiency phenotypes suggest roles for other activators like p39.
Purpose of the Study:
- To investigate the specific roles of p35 and p39 in Cdk5 activation.
- To elucidate the distinct and redundant functions of p35 and p39.
- To determine if p35 and p39 are the primary Cdk5 activators in the nervous system.
Main Methods:
- Generation and analysis of p39-null mice.
- Generation and analysis of p35/p39 compound-mutant mice.
- Phenotypic comparison of Cdk5-null, p35-null, p39-null, and double-null mutants.
Main Results:
- p39-null mice exhibited no apparent abnormalities.
- p35/p39 double-null mutants displayed perinatal lethality and severe cortical lamination defects, mirroring Cdk5-null phenotypes.
- Analysis of intermediate compound mutants revealed distinct and overlapping functions of p35 and p39.
Conclusions:
- p35 and p39 are essential for Cdk5 activity during nervous system development.
- p35 and p39 are likely the principal activators of Cdk5 in the developing brain.
- Combined deficiency of p35 and p39 leads to severe developmental defects comparable to Cdk5 loss.