Typical Features of Genomes in the Mamiellophyceae

Grimsley, Nigel; Yau, Sheree; Piganeau, Gwenaël; Moreau, Hervé

doi:10.1007/978-4-431-55130-0_6

Cited by 12 publications

(16 citation statements)

References 85 publications

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“…However, the P. coloniale genome contains 41% coding sequences, higher than the early-diverging streptophytes but considerably lower than early-diverging Chlorophyta. In summary, the structural characteristics of the P. coloniale genome revealed its intermediate position between the extremely compact and small genomes of picoplanktonic early-diverging Chlorophyta 34 and the larger and structurally more complex genomes of early-diverging streptophytes 35,36 .…”

Section: Comparison Of Gene Families Among Archaeplastidamentioning

confidence: 94%

The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants

et al. 2020

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Genome analysis of the pico-eukaryotic marine green alga Prasinoderma coloniale CCMP 1413 unveils the existence of a novel phylum within green plants (Viridiplantae), the Prasinodermophyta, which diverged before the split of Chlorophyta and Streptophyta. Structural features of the genome and gene family comparisons revealed an intermediate position of the P. coloniale genome (25.3 Mb) between the extremely compact, small genomes of picoplanktonic Mamiellophyceae (Chlorophyta) and the larger, more complex genomes of early-diverging streptophyte algae. Reconstruction of the minimal core genome of Viridiplantae allowed identification of an ancestral toolkit of transcription factors and flagellar proteins. Adaptations of P. coloniale to its deep-water, oligotrophic environment involved expansion of light-harvesting proteins, reduction of early light-induced proteins, evolution of a distinct type of C 4 photosynthesis and carbon-concentrating mechanism, synthesis of the metal-complexing metabolite picolinic acid, and vitamin B 1 , B 7 and B 12 auxotrophy. The P. coloniale genome provides first insights into the dawn of green plant evolution.

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Section: Comparison Of Gene Families Among Archaeplastidamentioning

confidence: 94%

The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants

et al. 2020

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“…Bathycoccus has two reference genomes, one complete genome from the strain RCC1105 [10], isolated in the Banyuls bay, and a 64% complete single amplified genome co-assembly TOSAG39-1 from the Arabian sea [11]. One common feature shared by all Mamiellales genomes is the presence of two unusual "outlier" chromosomes which present striking structural and compositional differences from standard chromosomes [21]. In O. tauri, these chromosomes are chromosome 2 (big outlier chromosome or BOC) and chromosome 19 (small outlier chromosome or SOC) [22,23].…”

Section: Introductionmentioning

confidence: 99%

Genome Resolved Biogeography of Mamiellales

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et al. 2020

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Among marine phytoplankton, Mamiellales encompass several species from the genera Micromonas, Ostreococcus and Bathycoccus, which are important contributors to primary production. Previous studies based on single gene markers described their wide geographical distribution but led to discussion because of the uneven taxonomic resolution of the method. Here, we leverage genome sequences for six Mamiellales species, two from each genus Micromonas, Ostreococcus and Bathycoccus, to investigate their distribution across 133 stations sampled during the Tara Oceans expedition. Our study confirms the cosmopolitan distribution of Mamiellales and further suggests non-random distribution of species, with two triplets of co-occurring genomes associated with different temperatures: Ostreococcus lucimarinus, Bathycoccus prasinos and Micromonas pusilla were found in colder waters, whereas Ostreococcus spp. RCC809, Bathycoccus spp. TOSAG39-1 and Micromonas commoda were more abundant in warmer conditions. We also report the distribution of the two candidate mating-types of Ostreococcus for which the frequency of sexual reproduction was previously assumed to be very low. Indeed, both mating types were systematically detected together in agreement with either frequent sexual reproduction or the high prevalence of a diploid stage. Altogether, these analyses provide novel insights into Mamiellales’ biogeography and raise novel testable hypotheses about their life cycle and ecology.

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“…Typical features of the highly streamlined genomes of the Mamiellales include a higher GC content (48–64% [7,14], 59% for O . tauri ) than higher plants (41%, [15]) and two unusual “outlier” lower GC chromosomes that can carry higher proportions of transposons and genes predicted to originate from prokaryotes (see [16] for a recent review). In the type species O .…”

Section: Introductionmentioning

confidence: 99%

A Viral Immunity Chromosome in the Marine Picoeukaryote, Ostreococcus tauri

et al. 2016

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Micro-algae of the genus Ostreococcus and related species of the order Mamiellales are globally distributed in the photic zone of world's oceans where they contribute to fixation of atmospheric carbon and production of oxygen, besides providing a primary source of nutrition in the food web. Their tiny size, simple cells, ease of culture, compact genomes and susceptibility to the most abundant large DNA viruses in the sea render them attractive as models for integrative marine biology. In culture, spontaneous resistance to viruses occurs frequently. Here, we show that virus-producing resistant cell lines arise in many independent cell lines during lytic infections, but over two years, more and more of these lines stop producing viruses. We observed sweeping over-expression of all genes in more than half of chromosome 19 in resistant lines, and karyotypic analyses showed physical rearrangements of this chromosome. Chromosome 19 has an unusual genetic structure whose equivalent is found in all of the sequenced genomes in this ecologically important group of green algae.

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Typical Features of Genomes in the Mamiellophyceae

Cited by 12 publications

References 85 publications

The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants

The genome of Prasinoderma coloniale unveils the existence of a third phylum within green plants

Genome Resolved Biogeography of Mamiellales

A Viral Immunity Chromosome in the Marine Picoeukaryote, Ostreococcus tauri

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