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Isolation and characterization of the human MRE11 homologue
J H Petrini1, M E Walsh, C DiMare
1Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts, USA.
Abstract:
Mutation of the Saccharomyces cerevisiae RAD52 epistasis group gene, MRE11, blocks meiotic recombination, confers profound sensitivity to double-strand break damage, and has a hyperrecombinational phenotype in mitotic cells. We isolated a highly conserved human MRE11 homologue using a two-hybrid screen for DNA ligase I-interacting proteins. Human MRE11 shares approximately 50% identity with its yeast counterpart over the N-terminal half of the protein. MRE11 is expressed at the highest levels in proliferating tissues, but is also observed in other tissues. The MRE11 locus maps to human chromosome 11q21 in a region frequently associated with cancer-related chromosomal abnormalities. A MRE11-related locus was found on chromosome 7q11.2-q11.3.
Insights
The MRE11 gene is crucial for DNA repair and recombination in yeast and humans. Its human counterpart, MRE11, is conserved and linked to chromosomal abnormalities, suggesting a role in cancer.
Area of Science:
- Molecular Biology
- Genetics
- Cancer Research
Background:
- The Saccharomyces cerevisiae RAD52 epistasis group gene, MRE11, plays a critical role in DNA repair pathways.
- Mutations in MRE11 in yeast lead to impaired meiotic recombination and sensitivity to DNA double-strand breaks.
Purpose of the Study:
- To identify and characterize a human homologue of the yeast MRE11 gene.
- To investigate the expression patterns and chromosomal location of the human MRE11 gene.
Main Methods:
- A two-hybrid screen was employed to identify DNA ligase I-interacting proteins, leading to the isolation of human MRE11.
- Sequence homology analysis was performed to compare human MRE11 with its yeast counterpart.
- Gene expression analysis and chromosomal mapping were conducted.
Main Results:
- A highly conserved human MRE11 homologue was identified, sharing significant sequence identity with yeast MRE11.
- Human MRE11 is expressed in proliferating tissues and other tissues.
- The MRE11 locus was mapped to human chromosome 11q21, a region associated with cancer-related chromosomal abnormalities, and a related locus was found on chromosome 7q11.2-q11.3.
Conclusions:
- The human MRE11 gene is conserved and functionally related to its yeast homologue.
- The chromosomal location of human MRE11 suggests its potential involvement in the development of certain cancers.
- Further research into MRE11's role in DNA repair and chromosomal stability is warranted.