Cited by 284Genomics and Phylogenetic StudiesAquatic Ecosystems and Phytoplankton DynamicsBacterial Genetics and Biotechnology

Complete Genomic Structure of the Bloom-forming Toxic Cyanobacterium Microcystis aeruginosa NIES-843

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Kaneko, Takakazu, Nakajima, Nobuyoshi, Okamoto, Shinobu, Suzuki, Iwane, Tanabe, Yuuhiko, Tamaoki, Masanori, Nakamura, Yasukazu, Kasai, Fumie +15 more·2007·DNA Research

Abstract

The nucleotide sequence of the complete genome of a cyanobacterium, Microcystis aeruginosa NIES-843, was determined. The genome of M. aeruginosa is a single, circular chromosome of 5,842,795 base pairs (bp) in length, with an average GC content of 42.3%. The chromosome comprises 6312 putative protein-encoding genes, two sets of rRNA genes, 42 tRNA genes representing 41 tRNA species, and genes for tmRNA, the B subunit of RNase P, SRP RNA, and 6Sa RNA. Forty-five percent of the putative protein-encoding sequences showed sequence similarity to genes of known function, 32% were similar to hypothetical genes, and the remaining 23% had no apparent similarity to reported genes. A total of 688 kb of the genome, equivalent to 11.8% of the entire genome, were composed of both insertion sequences and miniature inverted-repeat transposable elements. This is indicative of a plasticity of the M. aeruginosa genome, through a mechanism that involves homologous recombination mediated by repetitive DNA elements. In addition to known gene clusters related to the synthesis of microcystin and cyanopeptolin, novel gene clusters that may be involved in the synthesis and modification of toxic small polypeptides were identified. Compared with other cyanobacteria, a relatively small number of genes for two component systems and a large number of genes for restriction-modification systems were notable characteristics of the M. aeruginosa genome.

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  • Previous studies have shown that a large proportion of transposases and RTase constituted long repeated sequences in some cyanobacteria.

    “Previous studies have shown that a large proportion of the transposases and RTase constituted the long repeated sequences in some cyanobacteria.57–60”

    From Whole genomic DNA sequencing and comparative genomic analysis of<i>Arthrospira platensis</i>: high genome plasticity and genetic diversity (2016) · cites this paper as [60]

    The Materials and methods section defines insertion sequences as multicopy DNA elements longer than 500 bp that can encode a transposase. The Results and discussion section reports 452 such copies in the Microcystis aeruginosa genome. These passages support the transposase-related repeat finding, but the paper passages do not identify RTase as a constituent of the repeats (page numbers unavailable). (LLM, conf=0.84)

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Research works printed but not linked: 1

  1. [5]Watanabe M. Watanabe M. F. Harada K. Carmichael W. W. Fujiki H. Toxic Microcystis 1996 Boca Raton CRC Press 13 34

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Authors
Kaneko, T., Nakajima, N., Okamoto, S., Suzuki, I., Tanabe, Y., Tamaoki, M., Nakamura, Y., Kasai, F., Watanabe, A., Kawashima, K., Kishida, Y., Ono, A., Shimizu, Y., Takahashi, C., Minami, C., Fujishiro, T., Kohara, M., Katoh, M., Nakazaki, N., Nakayama, S., Yamada, M., Tabata, S., & Watanabe, M. M.
Affiliations
  • Kazusa DNA Research Institute (JP)
  • National Institute for Environmental Studies (JP)
  • University of Tsukuba (JP)
Corresponding author
Kaneko, Takakazu
Venue
DNA Research
Published
2007
Volume
14
Issue
6
Pages
247-256
ISSN
  • 1340-2838 (ISSN-L)
  • 1756-1663
OpenAlex
W2126253234
Cited by
284
References
63
Citations by year
2026: 5 · 2025: 9 · 2024: 14 · 2023: 6 · 2022: 6 · 2021: 21 · 2020: 7 · 2019: 16 · 2018: 16 · 2017: 10 · 2016: 17 · 2015: 22 · 2014: 12 · 2013: 22 · 2012: 31
FWCI
5.29
Type
journal article
Language
en
Open access
Locations
  • DNA Research (publishedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
Keywords
Microcystis aeruginosa, cyanobacterial genome, genome structure, microcystin biosynthesis, cyanopeptolins, toxin gene clusters, transposable elements, insertion sequences, genome plasticity, homologous recombination, restriction-modification systems, two-component systems, cyanotoxins, bloom-forming cyanobacteria
MeSH terms
Bacterial Proteins, Base Composition, Base Sequence, Multigene Family, Molecular Sequence Data, Genome, Bacterial, Sequence Analysis, DNA, Protein Structure, Tertiary, Microcystis

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