生物
基因组
清脆的
蓝藻
水平基因转移
基因
进化生物学
遗传学
基因组
聚酮合酶
发菜
系统发育树
计算生物学
古细菌
系统发育学
作者
Anne D. Jungblut,Frédéric Raymond,Moïra B. Dion,Sylvain Moineau,Vani Mohit,Guillaume Quang N’Guyen,Maxime Déraspe,Élina Francovic-Fontaine,Connie Lovejoy,Alexander I. Culley,Jacques Corbeil,Warwick F. Vincent
标识
DOI:10.1111/1462-2920.15481
摘要
Nostoc (Nostocales, Cyanobacteria) has a global distribution in the Polar Regions. However, the genomic diversity of Nostoc is little known and there are no genomes available for polar Nostoc. Here we carried out the first genomic analysis of the Nostoc commune morphotype with a recent sample from the High Arctic and a herbarium specimen collected during the British Arctic Expedition (1875-76). Comparisons of the polar genomes with 26 present-day non-polar members of the Nostocales family highlighted that there are pronounced genetic variations among Nostoc strains and species. Osmoprotection and other stress genes were found in all Nostoc strains, but the two Arctic strains had markedly higher numbers of biosynthetic gene clusters for uncharacterised non-ribosomal peptide synthetases, suggesting a high diversity of secondary metabolites. Since viral-host interactions contribute to microbial diversity, we analysed the CRISPR-Cas systems in the Arctic and two temperate Nostoc species. There were a large number of unique repeat-spacer arrays in each genome, indicating diverse histories of viral attack. All Nostoc strains had a subtype I-D system, but the polar specimens also showed evidence of a subtype I-B system that has not been previously reported in cyanobacteria, suggesting diverse cyanobacteria-virus interactions in the Arctic.
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