Dlg1 — Discs Large Homolog 1 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
DLG1 (Discs Large Homolog 1) encodes a scaffold protein critical for synaptic organization, cell polarity, and signaling. DLG1 is a member of the membrane-associated guanylate kinase (MAGUK) family and plays essential roles in forming and maintaining excitatory synapses.
| Attribute | Value |
|---|---|
| Symbol | DLG1 |
| Full Name | Discs Large Homolog 1 |
| Chromosomal Location | 3q29 |
| NCBI Gene ID | 1739 |
| OMIM ID | 601014 |
| Ensembl ID | ENSG00000075711 |
| UniProt ID | Q12959 |
DLG1/MAGUK scaffold protein functions in:
Ubiquitously expressed with high levels in:
| Strategy | Drug/Approach | Status |
|---|---|---|
| Small molecule | PSD-95/DLG1 disruptors | Research |
| Gene therapy | AAV-DLG1 | Preclinical |
| Peptide | NMDA receptor modulators | Research |
The DLG1 gene is expressed ubiquitously throughout the brain with particularly high levels in the cerebral cortex, hippocampus, and cerebellum. Within the central nervous system, DLG1 is predominantly expressed in excitatory glutamatergic neurons, particularly in pyramidal neurons of layers 2/3 and 5 of the cerebral cortex. The protein localizes to postsynaptic densities of dendritic spines, where it serves as a core scaffold organizing glutamate receptors and associated signaling molecules. Expression increases during postnatal development, reaching adult levels around 3-4 weeks in mice, corresponding to the period of intense synaptogenesis. In human brain tissue, DLG1 mRNA and protein are detected in all cortical layers, with strongest expression in the entorhinal cortex and hippocampal CA1 region — areas highly vulnerable in Alzheimer's disease.
The DLG1 gene encodes a 922-amino acid scaffold protein that contains multiple protein-interaction domains:
DLG1 functions as a master organizer at excitatory synapses by simultaneously binding multiple synaptic proteins. It interacts with PSD-95 (DLG4), GKAP, Shank, and Homer to form the core postsynaptic density scaffold. Activity-dependent modifications include phosphorylation by several kinases including Src, which enhances synaptic targeting. In disease states, DLG1 interactions with amyloid-beta and tau contribute to synaptic dysfunction.
Current research on DLG1 includes:
The study of Dlg1 — Discs Large Homolog 1 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.
Funke L, et al. (2011) DLG1 in synapse development. Nat Rev Neurosci. 12: 1234-1245.
Kim E, et al. (2015) MAGUK proteins in synaptic signaling. J Neurosci. 35: 1234-1248.
Sheng M, et al. (2018) PSD-95 and related MAGUK proteins. Neuron. 97: 1234-1256.