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• W92953051 abstract "Maintaining the integrity of genetic information is fundamental for the life of a cell and the survival of a species. Cells can encounter DNA damage as a consequence of normal cellular metabolism or as a result of exposure to chemical or physical agents. Eukaryotic cells have developed a network of responses in order to deal with DNA damage thereby preserving the integrity of their genetic information. In the presence of extensive genetic insult, a surveillance mechanism or checkpoint is activated. The activation of this signal transduction pathway leads to an arrest of cell cycle progression to prevent replication and segregation of damaged DNA molecules and to induce transcription of several repair genes. Existing repair mechanisms are also mobilised, in a coordinated effort to restore the original DNA structure. Genes involved in either cell cycle checkpoints, DNA repair or genes that maintain the fidelity of chromosome segregation are often termed antimutators or caretaker genes, because they control the stability of the genome and prevent accumulation of mutations in so-called gatekeeper genes. This latter group of genes directly regulate the growth of tumours either by inhibiting growth or promoting death. A fundamental requirement for many DNA metabolism processes is the separation of the complementary strands of the DNA duplex. This is promoted by DNA helicases, which unwind nucleic-acid duplexes in an ATP-dependent manner to provide access to the template for proteins of the replication, recombination, repair and transcription machineries. Multiple DNA helicase families have been identified, all containing seven hallmark helicase motifs; members within each helicase family also share sequence homologies beyond and between these motifs. One example is the RecQ helicase family, named after the RecQ protein of Escherichia coli, which was identified during a search for mutants sensitive to thymine starvation. Five members of the RecQ family have been identified in the human genome, and mutations in three of the genes are responsible for genetic diseases that are characterised by genomic instability and a high incidence of cancer. Because mutants in RecQ family genes in other species also have unstable chromosomes, it was proposed that members of the RecQ helicase family play a central role in the maintenance of genomic stability and thereby the prevention of tumorigenesis." @default.
• W92953051 created "2016-06-24" @default.
• W92953051 creator A5015465417 @default.
• W92953051 creator A5016241358 @default.
• W92953051 creator A5085287245 @default.
• W92953051 date "2002-08-10" @default.
• W92953051 modified "2023-09-23" @default.
• W92953051 title "RecQ helicases and genome stability: lessons from model organisms and human disease" @default.
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