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Comparative Plastid Genomics of Synurophyceae: Inverted Repeat

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Comparative Plastid Genomics of Synurophyceae: Inverted Repeat Kim et al. BMC Evolutionary Biology (2019) 19:20 https://doi.org/10.1186/s12862-018-1316-9 RESEARCHARTICLE Open Access Comparative plastid genomics of Synurophyceae: inverted repeat dynamics and gene content variation Jong Im Kim1, Hyunmoon Shin1, Pavel Škaloud2, Jaehee Jung3, Hwan Su Yoon4, John M. Archibald5* and Woongghi Shin1* Abstract Background: The Synurophyceae is one of most important photosynthetic stramenopile algal lineages in freshwater ecosystems. They are characterized by siliceous scales covering the cell or colony surface and possess plastids of red- algal secondary or tertiary endosymbiotic origin. Despite their ecological and evolutionary significance, the relationships amongst extant Synurophyceae are unclear, as is their relationship to most other stramenopiles. Results: Here we report a comparative analysis of plastid genomes sequenced from five representative synurophycean algae. Most of these plastid genomes are highly conserved with respect to genome structure and coding capacity, with the exception of gene re-arrangements and partial duplications at the boundary of the inverted repeat and single-copy regions. Several lineage-specific gene loss/gain events and intron insertions were detected (e.g., cemA, dnaB, syfB, and trnL). Conclusions: Unexpectedly, the cemA gene of Synurophyceae shows a strong relationship with sequences from members of the green-algal lineage, suggesting the occurrence of a lateral gene transfer event. Using a molecular clock approach based on silica fossil record data, we infer the timing of genome re-arrangement and gene gain/loss events in the plastid genomes of Synurophyceae. Keywords: Algae, Stramenopiles, Synurophyceae, Plastid genomes, Lateral gene transfer Introduction Mallomonas have silica scales and bristles, while the colo- The Synurophyceae, a class of photosynthetic strameno- nial genus Neotessella is characterized by an oval-shaped pile (or heterokont) algae, is a morphologically diverse scale structure and a single scale case that surrounds the lineage with plastids derived from red algae via secondary whole colony. or tertiary endosymbiosis. They are motile organisms with The presence of four membranes surrounding two parallel emergent flagella, one or two plastids, a cell Synurophyceaen plastids provides direct evidence for coat in which the siliceous scales cover the entire cell, and the hypothesis that their plastids are derived by lack of an eyespot [1, 2]. Synurophyceae are presently eukaryote-eukaryote endosymbiosis, a process that is assigned to one of three genera: Mallomonas, Neotessella thought to have given rise to photosynthesis in several and Synura. Members of the genus Synura are colonial other protist lineages (e.g., cryptophytes, haptophytes, flagellates characterized by cells having two visible and euglenoids, chlorarachniophytes; [3–5]). The outermost unequal flagella, two plastids, and an external covering membrane of synurophycean plastids is continuous with of siliceous scales. Members of the single celled genus the endoplasmic reticulum (referred to as the chloroplast ER; CER), but unlike the red-algal derived plastids of other * Correspondence: [email protected]; [email protected] ‘chromists’ such as haptophytes and cryptophytes, a 5Department of Biochemistry and Molecular Biology, Dalhousie University, linkage between this membrane and the outer nuclear Halifax, Nova Scotia B3H 4R2, Canada envelope is either totally lacking or marginal [1]. The 1Department of Biology, Chungnam National University, Daejeon 34134, South Korea silica deposition vesicles (SDVs), in which siliceous scales Full list of author information is available at the end of the article © The Author(s). 2019 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. Kim et al. BMC Evolutionary Biology (2019) 19:20 Page 2 of 13 form, are produced from the CER on the outer side of the genome evolution of plastids in stramenopiles, we per- plastid. The mature scales are brought to the cell surface formed comparative and phylogenetic analyses of these via Golgi body vesicles and placed in position alongside genomes in the context of publicly available plastid gen- pre-existing scales [6, 7]. ome sequence data, including that of the chrysophycean Molecular sequence datasets that include combinations alga, Ochromonas sp. CCMP1393. Our results reveal of nuclear, plastid, and mitochondrial genes have provided highly conserved features of plastid genomes amongst the insight into the branching order amongst the three recog- synurophyceans. We also uncovered several examples of nized synurophyte genera and their phylogenetic relation- gene loss/gain, duplication and gene rearrangement. Our ship to other algae [8–10]. Recently, the plastid genome of results provides important insights into the evolutionary the chrysophycean alga Ochromonas sp. CCMP1393 was history of organelle genomes via lateral gene transfer reported [5]. The Ochromonas species genome was ‘con- (LGT) from green-algal lineages into the Synurophyceae, servative’ in possessing a large single copy region (LSC), a as well as divergence time estimates using molecular clock very short single copy region (SSC), and two inverted approaches based on silica fossil records. Collectively, repeats (IR) with 15 functional protein-coding genes and our data contribute to a better understanding of the ribosomal RNA operons. Recent phylogenomic studies of evolutionary history of the Synurophyceae. photosynthetic stramenopiles based on plastid genome data have focused mainly on Bacillariophyceae (diatoms) and Phaeophyceae (brown algae) with one or a few species Results from six additional classes—Bolidophyceae, Chrysophy- General features of Synurophyceae plastid genomes ceae, Eustigmatophyceae, Pelagophyceae, Raphidophyceae, Five new plastid genomes (ptDNA) were sequenced from Xanthophyceae—as well as plastid-bearing alveolates the synurophycean genera Mallomonas, Neotessella,and [5, 11]. While photosynthetic stramenopiles consist of Synura (Table 1,Fig.1). The structure and coding capacity at least 15 classes, phylogenetic relationships amongst of these ptDNAs were then compared to the published them, including Synurophyceae, are still unresolved. Inves- genome of the related chrysophycean alga, Ochromonas sp. tigation of organellar genome structure and coding capacity CCMP1393 [5]. The plastid genome sizes of the Synurophy- from new protists has the potential to complement phylo- ceae ranged from ~ 130 kbp (S. sphagnicola)to~147kbp genetic analyses by reinforcing observed relationships and (M. splendens) and the overall GC content ranged from 37.5 helping to resolve phylogenetic issues. to 42.4%. The overall organization of the five synurophytes Lateral gene transfer (LGT; also known as horizontal and Ochromonas sp. CCMP1393 was found to be con- gene transfer) is the movement of genetic material from served: they each contain a large single copy region, a one species into the genome of an unrelated species. very short single copy region, and two inverted repeats. LGT provides a potentially important source of genetic The plastid genomes of Synurophyceae share a core set variation in mitochondrial and plastid genomes, many of 134 functional protein-coding genes including genes of which display intron gain/loss and the presence of in the IR regions (Table 2). The plastid genome IR se- chimeric genes created by gene conversion. LGT appears quence length of the Synurophyceae and Ochromonas to be rare in algal plastid genome but a few probable cases sp. CCMP1393 ranged from 22.5 kbp to 31.6 kbp with of bacterial derived genes have nevertheless been docu- 15 functional protein-coding genes (ccs1, ccsA, chlI, mented. These include the leucine biosynthesis (leuC/D) petJ, petM, petN, psaC, psaM, psbA, psbC, psbD, rpl21, operon and RuBisCO genes of red algae [4, 12], the dnaX rpl27, rpl34, and secA), 3 rRNAs and 5 tRNAs. Introns gene and group II introns in cryptophytes [13–16], the and a pseudogene were found in the tRNA genes. The rpl36 gene in the haptophyte and cryptophyte plastid trnRUCU in S. petersenii, S. uvella,andM. splendens and genomes [13]andtheebo operon in Eustigmatophyceae trnEUUC in N. volvocina is present as a pseudogene; it has [17]. In addition, the plastid genomes of several angio- a low hidden Markov model score (HMM score = 0) and a sperms show evidence for LGT of one or more genes secondary structure-only score (2Str Score < 40) predicted from mitochondria to plastids [18–20]. Although in most by tRNAscan-SE. Synura and Mallomonas have an intron cases the underlying mechanisms are not known, taken in trnLUAA, whereas N. volvocina has introns in trnPUGG together these examples strongly suggest that LGT and trnSGCU (Table 3, Fig. 2). The five newly determined from bacteria to organelles and from one organelle to plastid genomes showed a high degree of structural another can occur. conservation relative to the representative species, Synura Here, we present five complete plastid genome se- petersenii
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