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【2013-12-31】Frontiers in Microbiology�？鞲濉維CIE】
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DNA Replication Origins in Microbial Genomes 導(dǎo)師主持的�？�，如有合適的工作，歡迎各位投稿。如有興趣，可站內(nèi)信聯(lián)系。 http://www.frontiersin.org/evolu ... origins_in_mic/2193 In collaboration with Frontiers in Microbiology, we are organizing a Research Topic titled "DNA Replication Origins in Microbial Genomes”. Frontiers, a Swiss open-access publisher, recently partnered with Nature Publishing Group to expand its researcher-driven Open Science platform. Frontiers articles are rigorously peer-reviewed, can be disseminated freely and are widely read by your colleagues and by the broader scientific and medical research communities. Research Topic DNA replication, a central event for cell proliferation, is the basis of biological inheritance. Complete and accurate DNA replication is integral to the maintenance of the genetic integrity of organisms. In all three domains of life, DNA replication begins at replication origins. In bacteria, replication initiates from a single replication origin (oriC), which contains several DnaA boxes. In eukaryotic genomes, replication initiates from significantly more replication origins, ranging from hundreds in yeast to tens of thousands in human, activated simultaneously at a specific time. For eukaryotic organisms, replication origins are best characterized in the unicellular eukaryote budding yeast Saccharomyces cerevisiae and the fission yeast Schizosaccharomyces pombe. The budding yeast origins contain an essential sequence element called the ARS (autonomously replicating sequence), while the fission yeast origins consist of AT-rich sequences. Within the archaeal domain, the multiple replication origins have been identified by a predict-and-verify approach in the hyperthermophilic archaeon Sulfolobus. Archaeal origins contain two or more short repetitive DNA sequences, known as origin recognition boxes (ORBs). It appears that archaea have a simplified version of the eukaryotic replication apparatus, which has led to considerable interest in the archaeal machinery as a model of that in eukaryotes. The identification of replication origins is important not only in providing insights into the structure and function of the replication origins but also in understanding the regulatory mechanisms of the initiation step in DNA replication. Therefore, intensive studies have been carried out on the identification of replication origins in the last two decades. The pioneer work to identify bacterial oriCs in silico is the GC-skew analysis. Later, a method of cumulative GC skew without sliding windows was proposed to give better resolution. Meanwhile, an oligomer-skew method was also proposed to predict oriC regions in bacterial genomes. As a unique representation of a DNA sequence, the Z-curve method has been proved to be an accurate and effective approach to predict bacterial and archaeal replication origins. Budding yeast origins have been predicted by Oriscan using similarity to the characterized ones, while the fission yeast origins have been indentified initially from AT content calculation. In comparison with the in silico analysis, the experimental methods are convincing and reliable, but time-consuming and labor-intensive. The microbial replication origins can be identified by several experimental methods including construction of replicative oriC plasmids, microarray-based or high-throughput sequencing-based marker frequency analysis, two-dimensional gel electrophoresis analysis and replication initiation point mapping (RIP mapping) etc. The recent genome-wide approaches to identify and characterize replication origin locations have boosted the number of mapped yeast replication origins. The availability of increasing complete microbial genomes and emerging approaches has created challenges and opportunities for identification of their replication origins in silico, as well as in vivo. This research topic invites for the studies of microbial replication origins, addressing all the issues mentioned above, by in silico analyses as well as in vivo experiments. Manuscripts describing original research, methods, opinions, reviews are all welcome, which would provide a comprehensive overview of this field. [ Last edited by 流風(fēng)易逝 on 2013-11-4 at 12:03 ] |
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