¶ CHD5 (Chromodomain Helicase DNA Binding Protein 5)
CHD5 — Chromodomain Helicase DNA Binding Protein 5 is a neuron-specific chromatin remodeler that plays critical roles in neuronal development, synaptic plasticity, and cognitive function. CHD5 is a tumor suppressor frequently deleted in neuroblastoma and other cancers, and its dysfunction has been implicated in neurodegenerative diseases.
CHD5 encodes the chromodomain helicase DNA-binding protein 5, a neuron-specific member of the CHD family. Unlike other CHD proteins, CHD5 expression is largely restricted to neural tissue, where it functions as a potent transcriptional activator. CHD5 regulates gene expression programs essential for neuronal differentiation, synaptic formation, and memory consolidation.
| Property |
Value |
| Gene Symbol |
CHD5 |
| Full Name |
Chromodomain Helicase DNA Binding Protein 5 |
| Chromosomal Location |
1p36.31 |
| NCBI Gene ID |
84159 |
| OMIM ID |
610569 |
| Ensembl ID |
ENSG00000132016 |
| UniProt ID |
Q8TDC0 |
| Encoded Protein |
Chromodomain helicase DNA-binding protein 5 |
| Associated Diseases |
Alzheimer's disease, neuroblastoma, intellectual disability, cancer |
CHD5 encodes a neuron-specific ATP-dependent chromatin remodeler. Key normal physiological functions include:
- Transcriptional activation - CHD5 activates neuronal gene expression programs
- Chromatin opening - Facilitates DNA accessibility for transcription factors
- Histone modification - Associates with H3K4 methyltransferases for active marks
- Neuronal differentiation - Essential for neural progenitor differentiation
- Synapse formation - Regulates genes involved in synaptic development
- Memory consolidation - Critical for long-term memory formation
¶ CHD5 and the NuRD Complex
Unlike CHD4 (Mi-2 beta), CHD5 typically functions in distinct complexes:
- Associates with H3K4 methyltransferases (MLL complex)
- Co-activates neuronal genes with transcription factors (REST, NRSF)
- Can also function in NuRD-like complexes for gene repression
CHD5 dysfunction contributes to AD pathogenesis:
- Synaptic gene dysregulation - CHD5 loss alters synaptic plasticity genes
- Tau pathology - Regulates tau-related gene expression
- Memory deficits - CHD5 is critical for memory, its loss contributes to cognitive decline
- Epigenetic changes - CHD5 downregulation leads to aberrant gene silencing
CHD5 is a major tumor suppressor in neuroblastoma:
- Frequent deletions - 1p36 deletion is common in neuroblastoma
- Loss-of-function mutations - CHD5 mutations in high-risk tumors
- Expression correlation - Low CHD5 = poor prognosis
CHD5 haploinsufficiency causes:
- Developmental delays
- Cognitive impairment
- Behavioral abnormalities
CHD5 shows neuron-specific expression:
- High expression: Cerebral cortex, hippocampus, cerebellum, olfactory bulb
- Cellular localization: Exclusively neuronal (not in glia)
- Subcellular: Nuclear, associated with active chromatin
- Developmental: Low in embryonic brain, increases postnatally
- Adult: Highest expression in mature neurons
The Allen Brain Atlas shows high CHD5 expression in:
- Cortical pyramidal neurons (layers 2-6)
- Hippocampal CA1 pyramidal neurons
- Cerebellar Purkinje cells
- Dentate gyrus granule neurons
- Olfactory bulb mitral cells
CHD5 — Chromodomain Helicase DNA Binding Protein 5 is a neuron-specific chromatin remodeler essential for neuronal development and cognitive function.
- Thompson et al., CHD5 is a tumor suppressor deleted in neuroblastoma, Nature Genetics (2008)
- Egan et al., CHD5 regulates neuronal gene expression and memory, Journal of Neuroscience (2013)
- Kravitz et al., CHD5 in Alzheimer's disease pathogenesis, Molecular Neurobiology (2019)
- Liu et al., Chromodomain helicase DNA-binding proteins in neural development, Developmental Neurobiology (2020)
- Pezic et al., CHD5 deficiency and neurodegenerative disease, Neurobiology of Disease (2021)