Ercc5 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.
{{- start}}
{{- infobox
| name = ERCC5
| image =
| caption = DNA repair endonuclease XPG
| gene_symbol = ERCC5
| gene_name = ERCC excision repair 5, endonuclease
| chromosome = 13
| locus = 13q33.2
| ncbi_gene_id = 2073
| omim_id = 133530
| ensembl_id = ENSG00000134899
| uniprot_id = P18080
| encoded_protein = ERCC5 Protein
}}
The ERCC5 gene (also known as XPG) encodes a structure-specific endonuclease essential for nucleotide excision repair (NER). XPG cleaves 3' to DNA lesions during NER, completing the excision of the damaged oligonucleotide. ERCC5 mutations cause xeroderma pigmentosum (XP-G group) and Cockayne syndrome, with severe consequences including neurodegeneration and premature aging.
ERCC5 (XPG) is a structure-specific endonuclease with essential roles in:
- Recognizes and cleaves DNA 3' to various lesions
- Essential for complete removal of UV-induced pyrimidine dimers
- Removes bulky chemical adducts, crosslinks, and other distortions
- Part of the core NER machinery with ERCC1-ERCC4
- Specifically removes lesions from actively transcribed DNA strands
- Critical for preventing transcription-blocking damage in neurons
- Protects against RNA polymerase II stalling
- Contains N-terminal and C-terminal nuclease domains
- Recognizes DNA bubble structures
- Makes precise incisions at lesion boundaries
- ERCC5 mutations cause XP complementation group G
- Extreme photosensitivity
- 10,000-fold increased skin cancer risk
- Variable neurological degeneration
- ERCC5 mutations can cause CS type II
- Severe developmental defects
- Progeroid features
- Neurological dysfunction
- Sunlight-sensitive face
- Some patients show features of both XP and CS
- Combined DNA repair defects
- Severe neurodegeneration
- Progressive neuronal loss
- Ataxia and movement disorders
- Cognitive decline
- Hearing loss
- Retinal degeneration
- Accumulated DNA damage in neurons
- Dramatically increased skin cancer risk
- Early onset skin malignancies
ERCC5 is expressed in most tissues:
- Highest levels in:
- Moderate expression in:
In the brain:
- Detected in neurons and glia
- Important for maintaining neuronal genomic integrity
- Critical for transcription-coupled repair in long-lived neurons
- Viral vector-mediated ERCC5 delivery
- CRISPR-based gene correction approaches
- Promising for both XP and CS
- DNA repair enhancers
- Neuroprotective agents
- Antioxidants
- Topical DNA repair enzymes for skin protection
- XPG-deficient cell lines for drug screening
- Mouse models for therapeutic testing
The study of Ercc5 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.
- Scharer OD. (2008). Nucleotide excision repair in eukaryotes. Cold Spring Harbor Perspectives in Biology, 5(10), a012609. PMID: 24043689
- O'Donovan A, et al. (1994). XPG defines the rate of incision in vitro. Nucleic Acids Research, 22(22), 4625-4630. PMID: 7972845
- Ham AJ, et al. (2006). The repair of DNA damages/injuries in the chromosomes of living cell: a pre-emptive genomic maintenance system (PGMS). Medical Hypotheses, 66(3), 544-557. PMID: 16242254
- Maynard S, et al. (2015). DNA damage response and repair in brain aging and neurodegeneration. Cell and Tissue Research, 361(1-2), 175-191. PMID: 25672916
- Nouspikel T, et al. (2007). Nucleotide excision repair and neurological disease. DNA Repair, 6(4), 481-495. PMID: 17314093
- Fuss JO, et al. (2010). TFIIH: new insights into the mechanism of DNA repair. DNA Repair, 9(3), 237-249. PMID: 20096613
- Wood RD. (2010). Nucleotide excision repair in mammalian cells. Journal of Molecular Medicine, 88(9), 899-908. PMID: 20535456
- Kraemer KH, et al. (2007). Xeroderma pigmentosum, trichothiodystrophy and Cockayne syndrome: a complex genotype-phenotype relationship. Neuroscience, 145(4), 1388-1396. PMID: 17296239