Ercc3 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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{{- infobox
| name = ERCC3
| image =
| caption = TFIIH core subunit
| gene_symbol = ERCC3
| gene_name = ERCC excision repair 3, TFIIH core subunit
| chromosome = 19
| locus = 19q13.2
| ncbi_gene_id = 2065
| omim_id = 133510
| ensembl_id = ENSG00000108840
| uniprot_id = P31260
| encoded_protein = ERCC3 Protein
}}
The ERCC3 gene (ERCC excision repair 3, TFIIH core subunit) encodes a DNA helicase that is a core component of transcription factor IIH (TFIIH). TFIIH is essential for both transcription initiation and nucleotide excision repair (NER). ERCC3 mutations cause severe human diseases including xeroderma pigmentosum (XP) and trichothiodystrophy, with profound neurological implications.
ERCC3 (also known as XPB) is a 3'→5' DNA helicase with ATPase activity. It functions as a subunit of TFIIH with critical roles in:
- Unwinds DNA around the transcription start site during RNA polymerase II initiation
- Promotes promoter opening for transcription
- Essential for transcription of most protein-coding genes
- Core NER machinery component
- Unwinds DNA around DNA lesions (UV-induced pyrimidine dimers, bulky adducts)
- Participates in verification and repair of DNA damage
- Contains seven conserved helicase motifs
- Forms a heterodimer with ERCC2 (XPD)
- ATP hydrolysis drives DNA unwinding
- XP-B group: ERCC3 mutations cause XP complementation group B
- Extreme sun sensitivity
- 10,000-fold increased risk of skin cancers
- Progressive neurodegeneration in some patients
- ERCC3 mutations can cause TTD
- Brittle hair, ichthyosis, neurological abnormalities
- Developmental delay, intellectual disability
- DNA repair defects lead to:
- Accumulated oxidative DNA damage in neurons
- Progressive neuronal loss
- Ataxia and movement disorders
- Premature aging phenotypes
- Increased risk of:
- Skin cancers (basal cell carcinoma, squamous cell carcinoma, melanoma)
- Internal malignancies
ERCC3 is ubiquitously expressed with high levels in:
- Skin (epidermis)
- Testis
- Brain (neurons and glia)
- Liver
- Lung
In the brain, ERCC3 expression is important for:
- Maintaining neuronal DNA integrity
- Supporting glial cell function
- Transcriptional programs essential for neural development
- Viral vector delivery of wild-type ERCC3
- CRISPR-based gene correction approaches
- DNA repair enhancers
- Antioxidants to reduce oxidative DNA damage
- Neuroprotective agents
The study of Ercc3 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.
- Compe E, et al. (2019). TFIIH: a key complex in gene expression regulation. RNA Biology, 16(3), 297-306. PMID: 30644751
- Egly JM, et al. (2011). The 14th Qin gold medal lecture: the decode in gene expression. International Journal of Oncology, 39(4), 783-791. PMID: 21667154
- Fuss JO, et al. (2010). TFIIH: new insights into the mechanism of DNA repair. DNA Repair, 9(3), 237-249. PMID: 20096613
- Tirode F, et al. (2000). Expression of the human DNA repair protein TFIIH in insect cells using recombinant baculovirus. Journal of Molecular Biology, 295(3), 537-546. PMID: 10656785
- Winkler GS, et al. (2000). DNA damage in RNA polymerase II-transcribed genes. Proceedings of the National Academy of Sciences, 97(8), 4309-4314. PMID: 10749855
- Nouspikel T, et al. (2007). Nucleotide excision repair and neurological disease. DNA Repair, 6(4), 481-495. PMID: 17314093
- de Laat WL, et al. (1999). DNA-binding polarity of human replication protein A. Nucleic Acids Research, 27(17), 3503-3509. PMID: 10454642
- Bergoglio V, et al. (2013). DNA synthesis and its control in proliferating and differentiating neural cells. Experimental Cell Research, 319(14), 2170-2183. PMID: 23578580