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Transposon-like properties of the major, long repetitive sequence family in the genome of Physarum polycephalum 总被引:3,自引:1,他引:2
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A family of long, highly-repetitive sequences, referred to previously as `HpaII-repeats', dominates the genome of the eukaryotic slime mould Physarum polycephalum. These sequences are found exclusively in scrambled clusters. They account for about one-half of the total complement of repetitive DNA in Physarum, and represent the major sequence component found in hypermethylated, 20-50 kb segments of Physarum genomic DNA that fail to be cleaved using the restriction endonuclease HpaII. The structure of this abundant repetitive element was investigated by analysing cloned segments derived from the hypermethylated genomic DNA compartment. We show that the `HpaII-repeat' forms part of a larger repetitive DNA structure, ~8.6 kb in length, with several structural features in common with recognised eukaryotic transposable genetic elements. Scrambled clusters of the sequence probably arise as a result of transposition-like events, during which the element preferentially recombines in either orientation with target sites located in other copies of the same repeated sequence. The target sites for transposition/recombination are not related in sequence but in all cases studied they are potentially capable of promoting the formation of small `cruciforms' or `Z-DNA' structures which might be recognised during the recombination process. 相似文献
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Inflammatory cytokines inhibit Kaposi's sarcoma-associated herpesvirus lytic gene transcription in in vitro-infected endothelial cells
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The response of Kaposi's sarcoma (KS)-associated herpesvirus (KSHV) to inflammatory cytokine treatment of experimentally infected endothelial cells was investigated. The cytokines inhibited spontaneous KSHV lytic gene expression but not the level of infection. The data suggest that if inflammatory cytokines present in KS lesions contribute to KSHV pathogenesis, they do so in part by promoting latent KSHV infection of the endothelial cells. 相似文献
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Paterson E Sim A Standing D Dorward M McDonald AJ 《Journal of experimental botany》2006,57(10):2413-2420
Root proliferation as a response to exploit zones of nutrient enrichment in soil has been demonstrated for a wide range of plant species. However, the effectiveness of this as a strategy to acquire nutrients is also dependent on interactions with the soil microbial community. Specifically, C-flow from roots modifies microbial activity and probably the balance between nutrient mineralization and immobilization processes in the rhizosphere. In this study, near-natural abundance 13C-labelling and gene-reporter methods were applied to determine the effects of uneven nitrate supply to roots of Hordeum vulgare on assimilate partitioning and root exudation. Plants were initially grown in uniform nitrate supply in split-root, sand microcosms after which one treatment continued to receive uniform supply, and the other received nitrate to one root compartment only. At the time of imposing the treatments, the CO2 supplied to the plants was switched to a cylinder source, providing a distinct delta13C-signature and allowing the fate of new assimilate within the plants to be determined. The labelling approach allowed quantification of the expected preferential allocation of new C-assimilate to roots in enriched nitrate, prior to any measurable effect on whole biomass or root architecture. Biosensor (lux-marked Pseudomonas fluorescens 10586 pUCD607) bioluminescence, quantified spatially by CCD imaging, demonstrated that root exudation was significantly increased for roots in enriched nitrate. This response of root exudation, being primarily associated with root apices and concurrent with enhanced assimilate supply, strongly suggests that C-flow from roots is an integral component of the proliferation response to nitrate. 相似文献
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Mairi Sime Amanda C. Allan Paul Chapman Charlotte Fieldhouse Gerard M.P. Giblin Mark P. Healy Millard H. Lambert Lisa M. Leesnitzer Ann Lewis Raymond V. Merrihew Richard A. Rutter Rosemary Sasse Barry G. Shearer Timothy M. Willson Robert X. Xu David J. Virley 《Bioorganic & medicinal chemistry letters》2013,23(4):1143
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Benedikt Junglas Stefan T. Huber Thomas Heidler Lukas Schlösser Daniel Mann Raoul Hennig Mairi Clarke Nadja Hellmann Dirk Schneider Carsten Sachse 《Cell》2021,184(14):3674-3688.e18
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Mairi Levitt 《New genetics and society》2013,32(1):77-87
The 'Gene Shop' was opened for one year, February 1997-98, in Manchester airport as part of the EUROSCREEN 2 project funded by the European Commission. Information about genes and genetic conditions was provided, on a drop-in basis, by touchscreen computer programmes, static displays, written materials and by a full time co-ordinator and a rota of staff of health visitors and doctors. The Gene Shop was intended to provide public education in genetics and attracted 10,500 visitors. The Gene Shop could be seen as a success when evaluated in terms of its stated aims but it embodied a deficit model of public understanding with content which portrayed developments in the science of genetics and its applications as an unproblematic progression. 相似文献
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Mairi J. Hunter Kate J. Treharne Alexandra K. Winter Diane M. Cassidy Stephen Land Anil Mehta 《PloS one》2010,5(7)