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New findings from University of Utrecht in the area of genetics described
2009 AUG 3 - (NewsRx.com) -- "The presence and functionality of DNA repair mechanisms in Campylobacter jejuni are largely unknown. In silico analysis of the complete translated genome of C. jejuni NCTC 11168 suggests the presence of genes involved in methyl-directed mismatch repair (MMR), nucleotide excision repair, base excision repair (BER), and recombinational repair," scientists in Netherlands report. "To assess the functionality of these putative repair mechanisms in C. jejuni, mutS, uvrB, ung, and recA knockout mutants were constructed and analyzed for their ability to repair spontaneous point mutations, UV irradiation-induced DNA damage, and nicked DNA. Inactivation of the different putative DNA repair genes did not alter the spontaneous mutation frequency. Disruption of the UvrB and RecA orthologues, but not the putative MutS or Ung proteins, resulted in a significant reduction in viability after exposure to UV irradiation. Assays performed with uracil-containing plasmid DNA showed that the putative uracil-DNA glycosylase (Ung) protein, important for initiation of the BER pathway, is also functional in C. jejuni. Inactivation of recA also resulted in a loss of natural transformation. Overall, the data indicate that C. jejuni has multiple functional DNA repair systems that may protect against DNA damage and limit the generation of genetic diversity," wrote E.J. Gaasbeek and colleagues, University of Utrecht. The researchers concluded: "On the other hand, the apparent absence of a functional MMR pathway may enhance the frequency of on-and-off switching of phase variable genes typical for C. jejuni and may contribute to the genetic heterogeneity of the C. jejuni population.." Gaasbeek and colleagues published their study in the Journal of Bacteriology (Functional Characterization of Excision Repair and RecA-Dependent Recombinational DNA Repair in Campylobacter jejuni. Journal of Bacteriology, 2009;191(12):3785-3793). For more information, contact J.A. Wagenaar, University of Utrecht, Dept. of Infectious Disease & Immunology, Yalelaan 1, NL-3584 CL Utrecht, Netherlands. Publisher contact information for the Journal of Bacteriology is: American Society Microbiology, 1752 N St. NW, Washington, DC 20036-2904, USA. Keywords: Netherlands, Campylobacter, DNA Damage, DNA Repair, DNA Research, Deoxyribonucleic Acid, Genetics, Proteomics, University of Utrecht. This article was prepared by Proteomics Weekly editors from staff and other reports. Copyright 2009, Proteomics Weekly via NewsRx.com.
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