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Title: Trichodesmium genome maintains abundant, widespread noncoding DNA in situ, despite oligotrophic lifestyle

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America

Understanding the evolution of the free-living, cyanobacterial, diazotroph Trichodesmium is of great importance because of its critical role in oceanic biogeochemistry and primary production. Unlike the other >150 available genomes of free-living cyanobacteria, only 63.8% of the Trichodesmium erythraeum (strain IMS101) genome is predicted to encode protein, which is 20–25% less than the average for other cyanobacteria and nonpathogenic, free-living bacteria. In this paper, we use distinctive isolates and metagenomic data to show that low coding density observed in IMS101 is a common feature of the Trichodesmium genus, both in culture and in situ. Transcriptome analysis indicates that 86% of the noncoding space is expressed, although the function of these transcripts is unclear. The density of noncoding, possible regulatory elements predicted in Trichodesmium, when normalized per intergenic kilobase, was comparable and twofold higher than that found in the gene-dense genomes of the sympatric cyanobacterial genera Synechococcus and Prochlorococcus, respectively. Conserved Trichodesmium noncoding RNA secondary structures were predicted between most culture and metagenomic sequences, lending support to the structural conservation. Conservation of these intergenic regions in spatiotemporally separated Trichodesmium populations suggests possible genus-wide selection for their maintenance. These large intergenic spacers may have developed during intervals of strong genetic drift caused by periodic blooms of a subset of genotypes, which may have reduced effective population size. Finally, our data suggest that transposition of selfish DNA, low effective population size, and high-fidelity replication allowed the unusual “inflation” of noncoding sequence observed in Trichodesmium despite its oligotrophic lifestyle.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); USDOE Joint Genome Institute (JGI), Walnut Creek, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Contributing Organization:
Univ. of Southern California, Los Angeles, CA (United States); Woods Hole Oceanographic Inst., Woods Hole, MA (United States); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Grant/Contract Number:
AC05-76RL01830; AC02-05CH11231; AC03-76SF00098
OSTI ID:
1208769
Alternate ID(s):
OSTI ID: 1286733
Report Number(s):
PNNL-SA-108623; KP1601010
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Vol. 112, Issue 14; ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 33 works
Citation information provided by
Web of Science

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Cited By (15)

The use of genome-scale metabolic network reconstruction to predict fluxes and equilibrium composition of N-fixing versus C-fixing cells in a diazotrophic cyanobacterium, Trichodesmium erythraeum journal January 2017
Variable depth distribution of Trichodesmium clades in the North Pacific Ocean: Trichodesmium clade depth distribution at Station ALOHA journal November 2016
Sequential splicing of a group II twintron in the marine cyanobacterium Trichodesmium journal November 2015
Regulatory RNAs in photosynthetic cyanobacteria journal April 2015
Functional Genomics and Phylogenetic Evidence Suggest Genus-Wide Cobalamin Production by the Globally Distributed Marine Nitrogen Fixer Trichodesmium journal February 2018
Molecular and physiological evidence of genetic assimilation to high CO 2 in the marine nitrogen fixer Trichodesmium journal November 2016
Structural and functional characterization of IdiA/FutA (Tery_3377), an iron-binding protein from the ocean diazotroph Trichodesmium erythraeum journal September 2018
Epibionts dominate metabolic functional potential of Trichodesmium colonies from the oligotrophic ocean journal May 2017
Transcriptional and Proteomic Choreography Under Phosphorus Deficiency and Re-supply in the N2 Fixing Cyanobacterium Trichodesmium erythraeum journal March 2019
Mechanisms of increased Trichodesmium fitness under iron and phosphorus co-limitation in the present and future ocean journal June 2016
Desert Dust as a Source of Iron to the Globally Important Diazotroph Trichodesmium journal January 2018
The Trichodesmium consortium: conserved heterotrophic co-occurrence and genomic signatures of potential interactions journal April 2017
The future of genomics in polar and alpine cyanobacteria journal February 2018
Evidence for polyploidy in the globally important diazotroph Trichodesmium journal October 2016
Microbiome of Trichodesmium Colonies from the North Pacific Subtropical Gyre journal July 2017