Nod2 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.
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Full Name
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Nucleotide-Binding Oligomerization Domain-Containing Protein 2
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Symbol
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NOD2
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Chromosomal Location
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16q12.1
NCBI Gene ID
64127
UniProt ID
Q9HC29
Ensembl ID
ENSG00000105904
Associated Diseases
Crohn's Disease, Blau Syndrome, Early-Onset Sarcoidosis, Inflammatory Bowel Disease, Neuroinflammation
This page provides comprehensive information about the subject's role in neurodegenerative diseases. The subject participates in various molecular pathways and cellular processes relevant to Alzheimer's disease, Parkinson's disease, and related conditions.
NOD2 encodes nucleotide-binding oligomerization domain-containing protein 2, an intracellular pattern recognition receptor that senses bacterial muramyl dipeptide (MDP). Unlike membrane-bound Toll-like receptors, NOD2 is located in the cytoplasm of cells including macrophages, dendritic cells, and intestinal epithelial cells.
Key functions include:
- Innate immune sensing: Recognizes bacterial components and initiates inflammatory responses
- NF-κB activation: Triggers pro-inflammatory signaling cascades
- Autophagy induction: Regulates antimicrobial autophagy (xenophagy)
- Mucosal defense: Critical for intestinal barrier function
- Anti-microbial peptides: Induces alpha-defensin production in Paneth cells
NOD2 was the first Crohn's disease susceptibility gene identified:
- Three common variants (R702W, G908R, L1007fs) increase disease risk 2-4 fold
- Associated with ileal disease and stricturing phenotype
- Loss-of-function mutations impair bacterial sensing
- Altered autophagy and bacterial clearance
Autosomal dominant NOD2 mutations cause Blau syndrome:
- Early-onset granulomatous arthritis
- Dermatitis
- Uveitis
- Granulomatous inflammation in multiple organs
NOD2 is expressed in the brain and may contribute to neurodegeneration:
- Alzheimer's Disease: NOD2 variants may influence AD risk; roles in microglial activation
- Parkinson's Disease: Altered NOD2 signaling in PD brains
- Multiple Sclerosis: NOD2 implicated in MS pathogenesis
NOD2 is expressed in:
- Immune cells: Macrophages, monocytes, dendritic cells
- Intestine: Epithelial cells, Paneth cells
- Liver: Hepatocytes, Kupffer cells
- Brain: Microglia, astrocytes, neurons (lower levels)
In the brain, NOD2 is primarily expressed in microglia, the resident immune cells of the CNS.
- Hugot et al., NOD2 mutations in Crohn's disease (2001)
- Ogura et al., NOD2 structure and function (2001)
- Travassos et al., NOD2 and autophagy (2010)
- Liu et al., NOD2 in Alzheimer's disease (2018)
- Zhang et al., NOD2 in Parkinson's disease (2019)
The study of Nod2 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.