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 is an important component in the neurobiology of neurodegenerative diseases. This page provides detailed information about its structure, function, and role in disease processes.
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.
Function
MRE11 is a key player in the recognition and processing of DNA double-strand breaks (DSBs), the most cytotoxic form of DNA damage.
Nuclease Activity
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
Role in DNA Repair Pathways
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
Signaling Functions
Recruits and activates ATM kinase
Facilitates phosphorylation of downstream targets
Participates in cell cycle checkpoint activation
Disease Associations
Ataxia-Telangiectasia-Like Disease (ATLD)
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
Cancer Predisposition
Increased risk of breast cancer
Hematological malignancies
Various solid tumors in carriers
Neurodegeneration
Cerebellar degeneration observed in ATLD patients
Progressive motor dysfunction
DNA repair deficits in [neurons](/entities/neurons) may contribute to age-related neurodegeneration
Expression
Brain Expression
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
Regulation
Constitutively expressed at moderate levels
Rapidly recruited to DNA damage sites
Phosphorylation by ATM regulates activity
Key Publications
Stracker TH, Petrini JH (2011). "The MRE11 complex: starting from the ends." Nat Rev Mol Cell Biol. PMID: 21252998(https://pubmed.ncbi.nlm.nih.gov/21252998/)
Buis J, et al. (2008). "Mre11 nuclease activity has essential roles in DNA repair and genomic stability." Cell. PMID: 19013279(https://pubmed.ncbi.nlm.nih.gov/19013279/)
Stewart GS, et al. (2009). "The DNA damage response and DNA repair." Cold Spring Harb Symp Quant Biol. PMID: 19843589(https://pubmed.ncbi.nlm.nih.gov/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.
References
Pathway Diagram
The following diagram shows the key molecular relationships involving MRE11 Gene discovered through SciDEX knowledge graph analysis: