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| Doublecortin (DCX) |
|---|
| Gene | [DCX](/genes/DCX) |
| UniProt | O43502 |
| PDB Structures | 1MJD, 2GJO |
| Molecular Weight | 40 kDa |
| Localization | Microtubules, neuronal soma and processes |
| Protein Family | Doublecortin family |
Doublecortin (Dcx) Protein is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
This page provides comprehensive information about this protein. See the content below for detailed information.
Doublecortin is a microtubule-associated protein essential for neuronal migration and cortical lamination. Mutations cause lissencephaly and double cortex syndrome, highlighting its critical role in brain development.
DCX has a distinctive architecture:
- N-terminal doublecortin domain (DC domain) - microtubule binding
- C-terminal serine/proline-rich region - regulatory functions
- Multiple phosphorylation sites - kinase regulation
- Homodimerization interface - forms functional dimers
The doublecortin domain is a unique structural motif that distinguishes DCX from other MAPs.
In developing neurons, DCX performs critical functions:
- Neuronal migration - guides neuronal translocation
- Cortical lamination - establishes proper layer organization
- Microtubule stabilization - promotes microtubule assembly
- Axonal guidance - directs axon growth
- Dendrite formation - regulates dendritic arborization
DCX mutations cause X-linked lissencephaly:
- Smooth brain surface - absent or reduced gyration
- Thickened cortex - abnormal cortical layering
- Severe developmental delay - profound intellectual disability
- Seizures - early-onset epilepsy
- Males - more severely affected
- Subcortical band heterotopia in females
- Milder phenotype than lissencephaly
- X-linked dominant inheritance
- Mosaic expression
- DCX mutations in some cases
- Nodular gray matter heterotopia
- Seizures and developmental delay
- Altered DCX expression in AD
- May affect neuronal connectivity
- Potential regenerative role
- Gene therapy - restore DCX expression
- Microtubule stabilizers - compensate for DCX loss
- Seizure management - antiepileptic drugs
- Supportive care - developmental support
- des Portes V, et al. (1998). "A novel CNS gene required for neuronal migration and involved in X-linked subcortical laminar heterotopia and lissencephaly syndrome." Cell. 92(1):51-61. DOI:10.1016/s0092-8674(0080898-3
- Gleeson JG, et al. (1998). "Doublecortin, a brain-specific gene mutated in human X-linked lissencephaly and double cortex syndrome, encodes a putative signaling protein." Cell. 92(1):63-72. DOI:10.1016/s0092-8674(0080899-5
- Koizumi H, et al. (2006). "Doublecortin maintains bipolar shape and nuclear translocation during migration in the adult forebrain." Nat Neurosci. 9(6):779-787. DOI:10.1038/nn1704
The study of Doublecortin (Dcx) Protein 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.