Mre11 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.
| MRE11 Gene |
|---|
| Gene Symbol | MRE11 |
| Full Name | MRE11 Homolog, Double Strand Break Repair Nuclease |
| Chromosomal Location | 11q21 |
| NCBI Gene ID | 7321 |
| OMIM | 600814 |
| Ensembl ID | ENSG00000020922 |
| UniProt ID | P43146 |
| Associated Diseases | Ataxia-Telangiectasia-Like Disease, Cancer Predisposition, Neurodegeneration |
The MRE11 gene encodes the MRE11 nuclease, a critical component of the MRN complex (MRE11-RAD50-NBS1) that initiates the cellular response to DNA double-strand breaks. This protein possesses both endonuclease and exonuclease activities essential for DNA repair.
MRE11 is a key player in the recognition and processing of DNA double-strand breaks (DSBs), the most cytotoxic form of DNA damage.
- Endonuclease Activity: Cuts DNA internally at damage sites
- Exonuclease Activity: Removes nucleotides from DNA ends
- Hairpin Opening: Resolves hairpin and loop structures
- End Resection: Processes DNA ends for homologous recombination
- MRN Complex: Forms the core sensor complex with RAD50 and NBS1
- Homologous Recombination: Initiates 5' to 3' end resection
- Non-Homologous End Joining: Processes ends for NHEJ repair
- Microhomology-Mediated End Joining: Alternative DSB repair pathway
- Telomere Maintenance: Essential for telomere integrity
- Recruits and activates ATM kinase
- Facilitates phosphorylation of downstream targets
- Participates in cell cycle checkpoint activation
Autosomal recessive disorder caused by mutations in MRE11, characterized by:
Clinical Features:
- Progressive cerebellar ataxia
- Oculomotor apraxia
- Mild immunodeficiency
- Radiation sensitivity
- Variable cancer predisposition
Inheritance Pattern: Autosomal recessive
Note: ATLD is phenotypically milder than ataxia-telangiectasia due to residual MRE11 function
- Increased risk of breast cancer
- Hematological malignancies
- Various solid tumors in carriers
- Cerebellar degeneration observed in ATLD patients
- Progressive motor dysfunction
- DNA repair deficits in neurons may contribute to age-related neurodegeneration
- Expressed in neurons and glia throughout the CNS
- High expression in proliferating neural progenitor cells
- Essential for genomic stability in neural development
- Expression maintained in adult brain
- Constitutively expressed at moderate levels
- Rapidly recruited to DNA damage sites
- Phosphorylation by ATM regulates activity
- Stracker TH, Petrini JH (2011). "The MRE11 complex: starting from the ends." Nat Rev Mol Cell Biol. PMID:21252998
- Buis J, et al. (2008). "Mre11 nuclease activity has essential roles in DNA repair and genomic stability." Cell. PMID:19013279
- Stewart GS, et al. (2009). "The DNA damage response and DNA repair." Cold Spring Harb Symp Quant Biol. PMID:19843589
The study of Mre11 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.