A closely-related clade of globally distributed bloom-forming cyanobacteria within the Nostocales.

Journal Article (Journal Article)

In order to better understand the relationships among current Nostocales cyanobacterial blooms, eight genomes were sequenced from cultured isolates or from environmental metagenomes of recent planktonic Nostocales blooms. Phylogenomic analysis of publicly available sequences placed the new genomes among a group of 15 genomes from four continents in a distinct ADA clade (Anabaena/Dolichospermum/Aphanizomenon) within the Nostocales. This clade contains four species-level groups, two of which include members with both Anabaena-like and Aphanizomenon flos-aquae-like morphology. The genomes contain many repetitive genetic elements and a sizable pangenome, in which ABC-type transporters are highly represented. Alongside common core genes for photosynthesis, the differentiation of N2 -fixing heterocysts, and the uptake and incorporation of the major nutrients P, N and S, we identified several gene pathways in the pangenome that may contribute to niche partitioning. Genes for problematic secondary metabolites-cyanotoxins and taste-and-odor compounds-were sporadically present, as were other polyketide synthase (PKS) and nonribosomal peptide synthetase (NRPS) gene clusters. By contrast, genes predicted to encode the ribosomally generated bacteriocin peptides were found in all genomes.

Full Text

Duke Authors

Cited Authors

  • Driscoll, CB; Meyer, KA; Šulčius, S; Brown, NM; Dick, GJ; Cao, H; Gasiūnas, G; Timinskas, A; Yin, Y; Landry, ZC; Otten, TG; Davis, TW; Watson, SB; Dreher, TW

Published Date

  • July 2018

Published In

Volume / Issue

  • 77 /

Start / End Page

  • 93 - 107

PubMed ID

  • 30005805

Electronic International Standard Serial Number (EISSN)

  • 1878-1470

International Standard Serial Number (ISSN)

  • 1568-9883

Digital Object Identifier (DOI)

  • 10.1016/j.hal.2018.05.009


  • eng