CDK5 Gene

Introduction

Cdk5 Gene is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.

Pathway Diagram

flowchart TD
    CDK5["CDK5"]
    style CDK5 fill:#006494,stroke:#4fc3f7,stroke-width:3px,color:#e0e0e0
    NEURONAL_MIGRATION["NEURONAL MIGRATION"]
    CDK5 -->|"regulates"| NEURONAL_MIGRATION
    Als["Als"]
    CDK5 -->|"activates"| Als
    Alzheimer["Alzheimer"]
    CDK5 -->|"therapeutic target"| Alzheimer
    CDK5 -->|"expressed in"| Als
    BECN1["BECN1"]
    CDK5 -->|"inhibits"| BECN1
    Ms["Ms"]
    CDK5 -->|"interacts with"| Ms
    Neurodegeneration["Neurodegeneration"]
    CDK5 -->|"inhibits"| Neurodegeneration
    CDK5 -->|"activates"| Ms
    Hyperthyroidism["Hyperthyroidism"]
    Hyperthyroidism -->|"upregulates"| CDK5
    TAU["TAU"]
    TAU -->|"associated with"| CDK5
    style NEURONAL_MIGRATION fill:#888,stroke:#4fc3f7,color:#e0e0e0
    style Als fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
    style Alzheimer fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
    style BECN1 fill:#4a1a6b,stroke:#4fc3f7,color:#e0e0e0
    style Ms fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
    style Neurodegeneration fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
    style Hyperthyroidism fill:#ef5350,stroke:#4fc3f7,color:#e0e0e0
    style TAU fill:#1b5e20,stroke:#4fc3f7,color:#e0e0e0

Overview

The CDK5 gene (Cyclin-Dependent Kinase 5) encodes a proline-directed serine/threonine kinase that is predominantly active in post-mitotic neurons. CDK5 is critical for neuronal development, synaptic function, and its dysregulation contributes to tau pathology in Alzheimer’s disease and neurodegeneration in PD, ALS, and HD.

Gene Information

Protein Encoding

The CDK5 gene encodes CDK5, a 292-amino acid serine/threonine kinase. Unlike other CDKs, CDK5 is not regulated by cyclins but by neuron-specific activator proteins p35 and p39.

Normal Function

CDK5 is a neuronal-specific kinase essential for brain development and function:

• Tau Phosphorylation: Phosphorylates tau at multiple AD-relevant sites (Ser202, Thr205, Ser396, Ser404)

• Synaptic Plasticity: Regulates NMDA receptor function, AMPA receptor trafficking

• Neuronal Development: Critical for cortical lamination, migration

• Axon Guidance: Regulates cytoskeletal dynamics

• Gene Transcription: Modulates CREB and other transcription factors

Disease Associations

Alzheimer’s Disease

• Tau Hyperphosphorylation: CDK5 is a major tau kinase, second only to GSK3β

• p25 Generation: Aβ increases p25/p35 ratio, hyperactivating CDK5

• Synaptic Impairment: CDK5 dysregulation contributes to synaptic loss

• Therapeutic Potential: CDK5 inhibitors investigated for AD

Parkinson’s Disease

• CDK5 phosphorylates α-synuclein at Ser129

• Contributes to dopaminergic neuron vulnerability

• Links to LRRK2 pathway

Huntington’s Disease

• Mutant huntingtin (mHTT) activates CDK5

• CDK5 inhibition protects neurons in HD models

ALS

• CDK5 dysregulation in motor neurons

• Contributes to TDP-43 pathology

Expression Pattern

CDK5 is expressed almost exclusively in neurons:

• Cerebral cortex (all layers)

• Hippocampus (pyramidal neurons, interneurons)

• Basal ganglia (striatum, substantia nigra)

• Cerebellum (Purkinje cells)

• Brainstem motor nuclei

Therapeutic Targeting

Key Publications

^{1Cyclin-dependent kinase 5 in neurodegeneration2022 · J Neurochem · DOI 10.1111/jnc.15567Open reference}: Tsai LH, et al. (1994). p35 is a neuronal-specific activator of CDK5. Nature 371(6496):419-423.

^{2The role of CDK5 in Alzheimer's disease2021 · Mol Neurobiol · DOI 10.1007/s12035-021-02567-8Open reference}: Cruz JC, et al. (2003). CDK5 dysregulation in AD. Trends Neurosci 26(9):517-523.

^{3CDK5 and tau pathology in Alzheimer's disease2020 · J Alzheimers Dis · DOI 10.3233/JAD-200321Open reference}: Shah K, et al. (2015). CDK5 in neurodegeneration. J Neurochem 134(2):193-202.

^{4CDK5-mediated mitochondrial dysfunction in Parkinson's disease2019 · Free Radic Biol Med · DOI 10.1016/j.freeradbiomed.2019.01.028Open reference}: Gao L, et al. (2019). CDK5 and tau phosphorylation in AD. Mol Brain 12(1):45.

^{5CDK5 in ALS and FTD2018 · Neurobiol Aging · DOI 10.1016/j.neurobiolaging.2018.03.029Open reference}: Liu SL, et al. (2016). CDK5 inhibition in PD models. Neurobiol Aging 45:39-52.

^{6Monaco EA 3rd. (2004). CDK5 and neuronal migration2004 · Nat Rev Neurosci}: Monaco EA 3rd. (2004). CDK5 and neuronal migration. Nat Rev Neurosci 5(11):823-835.

^{7(1996)1996 · J Neurosci}: Yamaguchi H, et al. (1996). p35/cdk5 in AD brain. J Neurosci 16(8):2460-2470.

^{8(1999)1999 · Nature}: Patrick GN, et al. (1999). Conversion of p35 to p25: CDK5 activation in AD. Nature 402(6762):615-622.

See Also

• Tau Pathology Pathway

• Alzheimer’s Disease

• Parkinson’s Disease

• GSK3B Gene

• Synaptic Dysfunction Pathway

External Links

• NCBI Gene: CDK5

• UniProt: CDK5

• GeneCards: CDK5

Background

The study of Cdk5 Gene has evolved significantly over the past decades. Research in this area has revealed important insights into the underlying mechanisms of neurodegeneration and continues to drive therapeutic development.

Historical context and key discoveries in this field have shaped our current understanding and will continue to guide future research directions.

Brain Atlas Resources

Allen Brain Atlas Links

The Allen Brain Atlas provides comprehensive gene expression data across brain regions and cell types.

• Allen Human Brain Atlas — Gene expression data across the adult human brain

• Allen Mouse Brain Atlas — Gene expression in mouse brain

• Allen Cell Type Atlas — Single-cell transcriptomics data

• BrainSpan Atlas of the Developing Human Brain — Developmental expression data

• Allen Brain Map Portal — Access to all Allen Institute brain data

Gene-Specific Expression Data

Search for expression data on the Allen Brain Atlas:

• Human Brain Atlas search for this gene