Genome Evolution of Filamentous Cyanobacterium Nostoc Species: From Facultative Symbiosis to Free Living

• DOI: 10.3390/microorganisms9102015
• Publication Date: 2021-09-24T04:30:33Z
• Authors: Da Huo; Hua Li; Fangfang Cai; Xiaoyu Guo; Zhiyi Qiao; Weibo Wang; Gongliang Yu; Renhui Li
• Keywords: Facultative; Obligate; Nostoc; Comparative Genomics

In contrast to obligate bacteria, facultative symbiotic bacteria are mainly characterized by genome enlargement. However, the underlying relationship of this feature with adaptations various habitats remains unclear. study, we used global data Nostoc strains, including 10 novel genomes sequenced in study and 26 available from public databases, analyzed their evolutionary history. The boundary real clade species was identified found be consistent results polyphasic taxonomy. initial ancestral demonstrated a population. Further analyses revealed that strains tended shift symbiosis free-living one, along an increase sizes during dispersal each exterior branch. Intracellular proved essentially related evolution, adaptation its members environments coupled large preference for gene acquisition involved repair recombination. These findings provided unique evidence genomic mechanisms which homologous microbes adapt distinct life manners external environments.