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Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Trichodesmium erythraeum IMS101

PROVIDER: GSE138176 | GEO | 2020/08/18

REPOSITORIES: GEO

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Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium [WGBS]

Project description:Our paper presents the results of a study in which we used whole genome bisulfite sequencing (WGBS) and RNA-Seq (i.e. transcriptomics) to examine the long-term epigenomic dynamics of an experimenta evolution study under high CO2 in the marine cyanobacterium Trichodesmium. We identify m5C methylated sites that rapidly change in response to short-term high CO2 exposure, which are then maintained for 4.5 years even after adaptation (i.e. trait canalization). After 7 years of CO2 selection, high-CO2 triggered methylation levels return to ancestral, low-CO2 levels, consistent with genetic assimilation theory and observations in eukaryotic model systems. These data suggest a potential role for m5C methylation in prokaryotic trait canalization and identify genetic assimilation as an evolutionary mechanism of potential biogeochemical importance under global change factors.

2020-08-18 | GSE138174 | GEO

Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium

Project description:Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium

| PRJNA574969 | ENA

Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium [WGBS]

Project description:Long-term epigenomic modifications underlying trait canalization to high CO2 in the biogeochemically-important marine cyanobacterium Trichodesmium [WGBS]

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Biogeographic conservation and CO2-dynamics of the cytosine methylome in the globally important cyanobacterium Trichodesmium

Project description:This SuperSeries is composed of the SubSeries listed below.

2018-03-01 | GSE86992 | GEO

Biogeographic conservation and CO2-dynamics of the cytosine methylome in the globally important cyanobacterium Trichodesmium [WGBS]

Project description:Our paper presents the results of a study in which we used whole genome bisulfite sequencing (WGBS), RNA-Seq (i.e. transcriptomics), high-CO2 physiology experiments, and spatiotemporally separated samples isolated in situ (i.e. directly from the ocean) to examine the metabolic potential of genome-wide cytosine (5mC) methylation (i.e. epigenomics), its potential impacts to transcriptional dynamics under both present-day and future ocean acidification conditions, and its biogeographic conservation in the globally-significant, biogeochemically-critical marine cyanobacterium Trichodesmium.

2018-03-01 | GSE86979 | GEO

Biogeographic conservation and CO2-dynamics of the cytosine methylome in the globally important cyanobacterium Trichodesmium [RNA-Seq]

2018-03-01 | GSE86991 | GEO

Trichodesmium--a widespread marine cyanobacterium with unusual nitrogen fixation properties.

Project description:The last several decades have witnessed dramatic advances in unfolding the diversity and commonality of oceanic diazotrophs and their N2 -fixing potential. More recently, substantial progress in diazotrophic cell biology has provided a wealth of information on processes and mechanisms involved. The substantial contribution by the diazotrophic cyanobacterial genus Trichodesmium to the nitrogen influx of the global marine ecosystem is by now undisputable and of paramount ecological importance, while the underlying cellular and molecular regulatory physiology has only recently started to unfold. Here, we explore and summarize current knowledge, related to the optimization of its diazotrophic capacity, from genomics to ecophysiological processes, via, for example, cellular differentiation (diazocytes) and temporal regulations, and suggest cellular research avenues that now ought to be explored.

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Sequential splicing of a group II twintron in the marine cyanobacterium Trichodesmium.

Project description:The marine cyanobacterium Trichodesmium is unusual in its genomic architecture as 40% of the genome is occupied by non-coding DNA. Although the majority of it is transcribed into RNA, it is not well understood why such a large non-coding genome fraction is maintained. Mobile genetic elements can contribute to genome expansion. Many bacteria harbor introns whereas twintrons, introns-in-introns, are rare and not known to interrupt protein-coding genes in bacteria. Here we show the sequential in vivo splicing of a 5400 nt long group II twintron interrupting a highly conserved gene that is associated with RNase HI in some cyanobacteria, but free-standing in others, including Trichodesmium erythraeum. We show that twintron splicing results in a putatively functional mRNA. The full genetic arrangement was found conserved in two geospatially distinct metagenomic datasets supporting its functional relevance. We further show that splicing of the inner intron yields the free intron as a true circle. This reaction requires the spliced exon reopening (SER) reaction to provide a free 5' exon. The fact that Trichodesmium harbors a functional twintron fits in well with the high intron load of these genomes, and suggests peculiarities in its genetic machinery permitting such arrangements.

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Iron and phosphorus deprivation induce sociality in the marine bloom-forming cyanobacterium Trichodesmium.

Project description:Trichodesmium spp. are diazotrophic cyanobacteria that exist as single filaments (trichomes) and as macroscopic colonies of varying shapes formed by aggregating trichomes. The causes and dynamics of colony formation and disassociation are not yet elucidated. we demonstrate that limited availability of dissolved phosphorus (P) or iron (Fe) stimulated trichome mobility and induced colony formation in Trichodesmium erythraeum IMS101 cultures. The specific nutrient limitation differentially affected the rate of colony formation and morphology of the colonies. Fe starvation promoted rapid colony formation (10-48 h from depletion) while 5-7 days were required for colonies to form in P-depleted cultures. Video analyses confirmed that the probability of trichomes to cluster increased from 12 to 35% when transferred from nutrient replete to Fe-depleted conditions. Moreover, the probability for Fe-depleted aggregates to remain colonial increased to 50% from only 10% in nutrient replete cultures. These colonies were also characterized by stronger attachment forces between the trichomes. Enrichment of nutrient-depleted cultures with the limited nutrient-stimulated colony dissociation into single trichomes. We postulate that limited P and Fe availability enhance colony formation of Trichodesmium and primarily control the abundance and distribution of its different morphologies in the nutrient-limited surface ocean.

| S-EPMC6018766 | biostudies-literature

Nitrate assimilation genes of the marine diazotrophic, filamentous cyanobacterium Trichodesmium sp. strain WH9601.

Project description:A 4.0-kb DNA fragment of Trichodesmium sp. strain WH9601 contained gene sequences encoding the nitrate reduction enzymes, nirA and narB. A third gene positioned between nirA and narB encodes a putative membrane protein with similarity to the nitrate permeases of Bacillus subtilis (NasA) and Emericella nidulans (CrnA). The gene was shown to functionally complement a DeltanasA mutant of B. subtilis and was assigned the name napA (nitrate permease). NapA was involved in both nitrate and nitrite uptake by the complemented B. subtilis cells. napA is distinct from the nrt genes that encode the nitrate transporter of freshwater cyanobacteria.

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