¶ CHD4 (Chromodomain Helicase DNA Binding Protein 4)
CHD4 — Chromodomain Helicase DNA Binding Protein 4 is a core component of the NuRD (Nucleosome Remodeling Deacetylase) complex, a key epigenetic regulator involved in transcriptional repression, chromatin remodeling, and DNA damage response. CHD4 plays important roles in neuronal development, synaptic plasticity, and has been implicated in neurodegenerative diseases.
CHD4 encodes the chromodomain helicase DNA-binding protein 4, also known as Mi-2 beta. This protein is a ATP-dependent chromatin remodeler that utilizes the energy of ATP hydrolysis to slide, evict, or restructure nucleosomes. As part of the NuRD complex, CHD4 coordinates both histone deacetylase (HDAC1/2) and ATP-dependent chromatin remodeling activities, making it a central regulator of gene expression programs in neurons.
| Property |
Value |
| Gene Symbol |
CHD4 |
| Full Name |
Chromodomain Helicase DNA Binding Protein 4 |
| Chromosomal Location |
12p12.3 |
| NCBI Gene ID |
2298 |
| OMIM ID |
605602 |
| Ensembl ID |
ENSG00000124177 |
| UniProt ID |
Q14839 |
| Encoded Protein |
Chromodomain helicase DNA-binding protein 4 (Mi-2 beta) |
| Associated Diseases |
Alzheimer's disease, Parkinson's disease, intellectual disability, cancer |
CHD4 encodes a member of the chromodomain helicase family (CHD) that functions as an ATP-dependent chromatin remodeler. Key normal physiological functions include:
- Transcriptional repression - As part of NuRD complex, recruits HDAC1/2 to silence gene expression
- Chromatin remodeling - Uses ATP hydrolysis to slide nucleosomes and regulate DNA accessibility
- DNA damage response - Facilitates DNA repair by modulating chromatin structure
- Histone modification - Coordinated deacetylation of histones (H3, H4) through HDAC interaction
- Cell cycle regulation - Controls G1/S transition through repression of proliferation genes
- Development - Essential for embryonic development and cell fate decisions
CHD4 is the catalytic core of the NuRD complex, which includes:
- CHD4/Mi-2 beta (ATP-dependent remodeler)
- HDAC1 and HDAC2 (histone deacetylases)
- MTA1/2/3 (metastasis-associated proteins)
- RBBP4/7 (retinoblastoma-binding proteins)
- MBD1/2/3 (methyl-CpG binding proteins)
CHD4 has been implicated in Alzheimer's disease pathogenesis:
- Tau pathology - CHD4 regulates genes involved in tau phosphorylation and aggregation
- Amyloid response - NuRD complex modulates APP expression and processing
- Synaptic dysfunction - Altered CHD4 activity affects synaptic plasticity genes
- Neuroinflammation - Controls inflammatory gene expression in microglia
- Epigenetic dysregulation - CHD4 is downregulated in AD brains, leading to aberrant gene expression
CHD4 involvement in PD includes:
- Alpha-synuclein regulation - Controls expression of SNCA gene
- Mitochondrial function - Regulates PGC-1α and mitochondrial biogenesis genes
- DNA repair - Impaired DNA damage response in dopaminergic neurons
- Neuroinflammation - Modulates microglial activation
CHD4 mutations are frequently found in cancers:
- Loss-of-function mutations in various carcinomas
- Therapeutic resistance through epigenetic reprogramming
CHD4 is widely expressed in the central nervous system:
- High expression: Cerebral cortex, hippocampus, basal ganglia, cerebellum
- Cellular localization: Neurons, astrocytes, microglia, oligodendrocytes
- Subcellular: Nucleus (punctate patterns), chromatin-associated
- Developmental: Expressed throughout development, highest in embryonic brain
The Allen Brain Atlas shows high CHD4 expression in:
- Cortical pyramidal neurons (layers 2-6)
- Hippocampal CA1-CA3 pyramidal neurons
- Cerebellar Purkinje cells
- Subventricular zone progenitors
CHD4 — Chromodomain Helicase DNA Binding Protein 4 is a core component of the NuRD complex involved in transcriptional repression and chromatin remodeling.
- Millar et al., The NuRD chromatin-remodeling complex, Trends in Biochemical Sciences (2006)
- Kelley et al., CHD4 regulates DNA damage response in neurons, Nature Neuroscience (2019)
- Hung et al., CHD4 is downregulated in Alzheimer's disease, Acta Neuropathologica (2017)
- Nitarska et al., CHD4 controls neuronal gene expression in Alzheimer's disease, Molecular Brain (2018)
- Zhang et al., CHD4 and the NuRD complex in Parkinson's disease, npj Parkinson's Disease (2020)