Author Report for: Jabbari KNo contact information in database for Jabbari K
Chalhoub B, Denoeud F, Liu S, Parkin IA, Tang H, Wang X, Chiquet J, Belcram H, Tong C and Wincker P <70 more author(s)> Chalhoub B, Denoeud F, Liu S, Parkin IA, Tang H, Wang X, Chiquet J, Belcram H, Tong C, Samans B, Correa M, Da Silva C, Just J, Falentin C, Koh CS, Le Clainche I, Bernard M, Bento P, Noel B, Labadie K, Alberti A, Charles M, Arnaud D, Guo H, Daviaud C, Alamery S, Jabbari K, Zhao M, Edger PP, Chelaifa H, Tack D, Lassalle G, Mestiri I, Schnel N, Le Paslier MC, Fan G, Renault V, Bayer PE, Golicz AA, Manoli S, Lee TH, Thi VH, Chalabi S, Hu Q, Fan C, Tollenaere R, Lu Y, Battail C, Shen J, Sidebottom CH, Canaguier A, Chauveau A, Berard A, Deniot G, Guan M, Liu Z, Sun F, Lim YP, Lyons E, Town CD, Bancroft I, Meng J, Ma J, Pires JC, King GJ, Brunel D, Delourme R, Renard M, Aury JM, Adams KL, Batley J, Snowdon RJ, Tost J, Edwards D, Zhou Y, Hua W, Sharpe AG, Paterson AH, Guan C, Wincker P (- 70) Ref: Science, 345:950, 2014 : PubMed ESTHER: Chalhoub_2014_Science_345_950 PubMedSearch: Chalhoub 2014 Science 345 950 PubMedID: 25146293 Gene_locus related to this paper: braol-Q8GTM3, braol-Q8GTM4, brana-a0a078j4a9, brana-a0a078e1m0, brana-a0a078cd75, brana-a0a078evd3, brana-a0a078j4f0, brana-a0a078cta5, brana-a0a078cus4, brana-a0a078f8c2, brana-a0a078jql1, brana-a0a078dgj3, brana-a0a078hw50, brana-a0a078cuu0, brana-a0a078iyl8, brana-a0a078dfa9, brana-a0a078ic91, brana-a0a078cnf7, brana-a0a078fh41, brana-a0a078ca65, brana-a0a078ctc8, brana-a0a078h021, brana-a0a078h0h8, brana-a0a078jx23, brana-a0a078ci96, brana-a0a078cqd7, brana-a0a078dh94, brana-a0a078h612, brana-a0a078ild2, brana-a0a078j2t3, braol-a0a0d3dpb2, braol-a0a0d3dx76, brana-a0a078jxa8, brana-a0a078i2k3, braol-a0a0d3ef55, brarp-m4dcj8, brana-a0a078fw53, brana-a0a078itf3, brana-a0a078jsn1, brana-a0a078jrt9, brana-a0a078i6d2, brana-a0a078jku0 Abstract Oilseed rape (Brassica napus L.) was formed ~7500 years ago by hybridization between B. rapa and B. oleracea, followed by chromosome doubling, a process known as allopolyploidy. Together with more ancient polyploidizations, this conferred an aggregate 72x genome multiplication since the origin of angiosperms and high gene content. We examined the B. napus genome and the consequences of its recent duplication. The constituent An and Cn subgenomes are engaged in subtle structural, functional, and epigenetic cross-talk, with abundant homeologous exchanges. Incipient gene loss and expression divergence have begun. Selection in B. napus oilseed types has accelerated the loss of glucosinolate genes, while preserving expansion of oil biosynthesis genes. These processes provide insights into allopolyploid evolution and its relationship with crop domestication and improvement. Title: Genome structure and metabolic features in the red seaweed Chondrus crispus shed light on evolution of the Archaeplastida Collen J, Porcel B, Carre W, Ball SG, Chaparro C, Tonon T, Barbeyron T, Michel G, Noel B and Boyen C <48 more author(s)> Collen J, Porcel B, Carre W, Ball SG, Chaparro C, Tonon T, Barbeyron T, Michel G, Noel B, Valentin K, Elias M, Artiguenave F, Arun A, Aury JM, Barbosa-Neto JF, Bothwell JH, Bouget FY, Brillet L, Cabello-Hurtado F, Capella-Gutierrez S, Charrier B, Cladiere L, Cock JM, Coelho SM, Colleoni C, Czjzek M, Da Silva C, Delage L, Denoeud F, Deschamps P, Dittami SM, Gabaldon T, Gachon CM, Groisillier A, Herve C, Jabbari K, Katinka M, Kloareg B, Kowalczyk N, Labadie K, LeBlanc C, Lopez PJ, McLachlan DH, Meslet-Cladiere L, Moustafa A, Nehr Z, Nyvall Collen P, Panaud O, Partensky F, Poulain J, Rensing SA, Rousvoal S, Samson G, Symeonidi A, Weissenbach J, Zambounis A, Wincker P, Boyen C (- 48) Ref: Proc Natl Acad Sci U S A, 110:5247, 2013 : PubMed ESTHER: Collen_2013_Proc.Natl.Acad.Sci.U.S.A_110_5247 PubMedSearch: Collen 2013 Proc.Natl.Acad.Sci.U.S.A 110 5247 PubMedID: 23503846 Gene_locus related to this paper: chocr-r7qut2, chocr-r7qfm4, chocr-r7qf11 Abstract Red seaweeds are key components of coastal ecosystems and are economically important as food and as a source of gelling agents, but their genes and genomes have received little attention. Here we report the sequencing of the 105-Mbp genome of the florideophyte Chondrus crispus (Irish moss) and the annotation of the 9,606 genes. The genome features an unusual structure characterized by gene-dense regions surrounded by repeat-rich regions dominated by transposable elements. Despite its fairly large size, this genome shows features typical of compact genomes, e.g., on average only 0.3 introns per gene, short introns, low median distance between genes, small gene families, and no indication of large-scale genome duplication. The genome also gives insights into the metabolism of marine red algae and adaptations to the marine environment, including genes related to halogen metabolism, oxylipins, and multicellularity (microRNA processing and transcription factors). Particularly interesting are features related to carbohydrate metabolism, which include a minimalistic gene set for starch biosynthesis, the presence of cellulose synthases acquired before the primary endosymbiosis showing the polyphyly of cellulose synthesis in Archaeplastida, and cellulases absent in terrestrial plants as well as the occurrence of a mannosylglycerate synthase potentially originating from a marine bacterium. To explain the observations on genome structure and gene content, we propose an evolutionary scenario involving an ancestral red alga that was driven by early ecological forces to lose genes, introns, and intergenetic DNA; this loss was followed by an expansion of genome size as a consequence of activity of transposable elements. Title: The banana (Musa acuminata) genome and the evolution of monocotyledonous plants D'Hont A, Denoeud F, Aury JM, Baurens FC, Carreel F, Garsmeur O, Noel B, Bocs S, Droc G and Wincker P <54 more author(s)> D'Hont A, Denoeud F, Aury JM, Baurens FC, Carreel F, Garsmeur O, Noel B, Bocs S, Droc G, Rouard M, Da Silva C, Jabbari K, Cardi C, Poulain J, Souquet M, Labadie K, Jourda C, Lengelle J, Rodier-Goud M, Alberti A, Bernard M, Correa M, Ayyampalayam S, McKain MR, Leebens-Mack J, Burgess D, Freeling M, Mbeguie AMD, Chabannes M, Wicker T, Panaud O, Barbosa J, Hribova E, Heslop-Harrison P, Habas R, Rivallan R, Francois P, Poiron C, Kilian A, Burthia D, Jenny C, Bakry F, Brown S, Guignon V, Kema G, Dita M, Waalwijk C, Joseph S, Dievart A, Jaillon O, Leclercq J, Argout X, Lyons E, Almeida A, Jeridi M, Dolezel J, Roux N, Risterucci AM, Weissenbach J, Ruiz M, Glaszmann JC, Quetier F, Yahiaoui N, Wincker P (- 54) Ref: Nature, 488:213, 2012 : PubMed ESTHER: D'Hont_2012_Nature_488_213 PubMedSearch: D'Hont 2012 Nature 488 213 PubMedID: 22801500 Gene_locus related to this paper: musam-m0trz2, musam-m0swe0, musam-m0t8q2, musam-m0szm0, musam-m0s936, musam-m0tfg3, musam-m0tfg5, musam-m0tfg2, musam-m0sqy8, musam-m0tqf6, musam-m0sq07, musam-m0ubs4, musam-m0t8q3, musam-m0shq9, musam-m0u2a8, musam-m0tv21, musam-m0tuu7 Abstract Bananas (Musa spp.), including dessert and cooking types, are giant perennial monocotyledonous herbs of the order Zingiberales, a sister group to the well-studied Poales, which include cereals. Bananas are vital for food security in many tropical and subtropical countries and the most popular fruit in industrialized countries. The Musa domestication process started some 7,000 years ago in Southeast Asia. It involved hybridizations between diverse species and subspecies, fostered by human migrations, and selection of diploid and triploid seedless, parthenocarpic hybrids thereafter widely dispersed by vegetative propagation. Half of the current production relies on somaclones derived from a single triploid genotype (Cavendish). Pests and diseases have gradually become adapted, representing an imminent danger for global banana production. Here we describe the draft sequence of the 523-megabase genome of a Musa acuminata doubled-haploid genotype, providing a crucial stepping-stone for genetic improvement of banana. We detected three rounds of whole-genome duplications in the Musa lineage, independently of those previously described in the Poales lineage and the one we detected in the Arecales lineage. This first monocotyledon high-continuity whole-genome sequence reported outside Poales represents an essential bridge for comparative genome analysis in plants. As such, it clarifies commelinid-monocotyledon phylogenetic relationships, reveals Poaceae-specific features and has led to the discovery of conserved non-coding sequences predating monocotyledon-eudicotyledon divergence. Title: The Ectocarpus genome and the independent evolution of multicellularity in brown algae Cock JM, Sterck L, Rouze P, Scornet D, Allen AE, Amoutzias G, Anthouard V, Artiguenave F, Aury JM and Wincker P <67 more author(s)> Cock JM, Sterck L, Rouze P, Scornet D, Allen AE, Amoutzias G, Anthouard V, Artiguenave F, Aury JM, Badger JH, Beszteri B, Billiau K, Bonnet E, Bothwell JH, Bowler C, Boyen C, Brownlee C, Carrano CJ, Charrier B, Cho GY, Coelho SM, Collen J, Corre E, Da Silva C, Delage L, Delaroque N, Dittami SM, Doulbeau S, Elias M, Farnham G, Gachon CM, Gschloessl B, Heesch S, Jabbari K, Jubin C, Kawai H, Kimura K, Kloareg B, Kupper FC, Lang D, Le Bail A, LeBlanc C, Lerouge P, Lohr M, Lopez PJ, Martens C, Maumus F, Michel G, Miranda-Saavedra D, Morales J, Moreau H, Motomura T, Nagasato C, Napoli CA, Nelson DR, Nyvall-Collen P, Peters AF, Pommier C, Potin P, Poulain J, Quesneville H, Read B, Rensing SA, Ritter A, Rousvoal S, Samanta M, Samson G, Schroeder DC, Segurens B, Strittmatter M, Tonon T, Tregear JW, Valentin K, von Dassow P, Yamagishi T, Van de Peer Y, Wincker P (- 67) Ref: Nature, 465:617, 2010 : PubMed ESTHER: Cock_2010_Nature_465_617 PubMedSearch: Cock 2010 Nature 465 617 PubMedID: 20520714 Gene_locus related to this paper: ectsi-d7fm61, ectsi-d7fs16, ectsi-d7fsv3, ectsi-d7fte8, ectsi-d7fux6, ectsi-d7fvr0, ectsi-d7fvu4, ectsi-d7fwk0, ectsi-d7fyh7, ectsi-d7g0w7, ectsi-d7g6g5, ectsi-d7g484, ectsi-d7g686, ectsi-d8lca9, ectsi-d8lfv2, ectsi-d8lqg6, ectsi-d8ltj9, ectsi-d7fjz2, ectsi-d7g376 Abstract Brown algae (Phaeophyceae) are complex photosynthetic organisms with a very different evolutionary history to green plants, to which they are only distantly related. These seaweeds are the dominant species in rocky coastal ecosystems and they exhibit many interesting adaptations to these, often harsh, environments. Brown algae are also one of only a small number of eukaryotic lineages that have evolved complex multicellularity (Fig. 1). We report the 214 million base pair (Mbp) genome sequence of the filamentous seaweed Ectocarpus siliculosus (Dillwyn) Lyngbye, a model organism for brown algae, closely related to the kelps (Fig. 1). Genome features such as the presence of an extended set of light-harvesting and pigment biosynthesis genes and new metabolic processes such as halide metabolism help explain the ability of this organism to cope with the highly variable tidal environment. The evolution of multicellularity in this lineage is correlated with the presence of a rich array of signal transduction genes. Of particular interest is the presence of a family of receptor kinases, as the independent evolution of related molecules has been linked with the emergence of multicellularity in both the animal and green plant lineages. The Ectocarpus genome sequence represents an important step towards developing this organism as a model species, providing the possibility to combine genomic and genetic approaches to explore these and other aspects of brown algal biology further. Title: The Phaeodactylum genome reveals the evolutionary history of diatom genomes Bowler C, Allen AE, Badger JH, Grimwood J, Jabbari K, Kuo A, Maheswari U, Martens C, Maumus F and Grigoriev IV <67 more author(s)> Bowler C, Allen AE, Badger JH, Grimwood J, Jabbari K, Kuo A, Maheswari U, Martens C, Maumus F, Otillar RP, Rayko E, Salamov A, Vandepoele K, Beszteri B, Gruber A, Heijde M, Katinka M, Mock T, Valentin K, Verret F, Berges JA, Brownlee C, Cadoret JP, Chiovitti A, Choi CJ, Coesel S, De Martino A, Detter JC, Durkin C, Falciatore A, Fournet J, Haruta M, Huysman MJ, Jenkins BD, Jiroutova K, Jorgensen RE, Joubert Y, Kaplan A, Kroger N, Kroth PG, La Roche J, Lindquist E, Lommer M, Martin-Jezequel V, Lopez PJ, Lucas S, Mangogna M, McGinnis K, Medlin LK, Montsant A, Oudot-Le Secq MP, Napoli C, Obornik M, Parker MS, Petit JL, Porcel BM, Poulsen N, Robison M, Rychlewski L, Rynearson TA, Schmutz J, Shapiro H, Siaut M, Stanley M, Sussman MR, Taylor AR, Vardi A, von Dassow P, Vyverman W, Willis A, Wyrwicz LS, Rokhsar DS, Weissenbach J, Armbrust EV, Green BR, Van de Peer Y, Grigoriev IV (- 67) Ref: Nature, 456:239, 2008 : PubMed ESTHER: Bowler_2008_Nature_456_239 PubMedSearch: Bowler 2008 Nature 456 239 PubMedID: 18923393 Gene_locus related to this paper: phatc-b7fp91, phatc-b7fqd3, phatc-b7frf9, phatc-b7fry8, phatc-b7ftw8, phatc-b7fv70, phatc-b7fw66, phatc-b7g2b2, phatc-b7g5z5, phatc-b7g6f1, phatc-b7g6r8, phatc-b7g957, phatc-b7ga73, phatc-b7gb22, phatc-b7gc60, phatc-b7gdm3, phatc-b7gdq6, phatc-b7ge82, phatc-b7gee0, phatr-b7frs5, phatr-b7g1k3, phatr-b7s4a4, thaps-b8bsy4, thaps-b8cfn8, phatc-b7g635, phatc-b7gaj3, thaps-b8c079 Abstract Diatoms are photosynthetic secondary endosymbionts found throughout marine and freshwater environments, and are believed to be responsible for around one-fifth of the primary productivity on Earth. The genome sequence of the marine centric diatom Thalassiosira pseudonana was recently reported, revealing a wealth of information about diatom biology. Here we report the complete genome sequence of the pennate diatom Phaeodactylum tricornutum and compare it with that of T. pseudonana to clarify evolutionary origins, functional significance and ubiquity of these features throughout diatoms. In spite of the fact that the pennate and centric lineages have only been diverging for 90 million years, their genome structures are dramatically different and a substantial fraction of genes ( approximately 40%) are not shared by these representatives of the two lineages. Analysis of molecular divergence compared with yeasts and metazoans reveals rapid rates of gene diversification in diatoms. Contributing factors include selective gene family expansions, differential losses and gains of genes and introns, and differential mobilization of transposable elements. Most significantly, we document the presence of hundreds of genes from bacteria. More than 300 of these gene transfers are found in both diatoms, attesting to their ancient origins, and many are likely to provide novel possibilities for metabolite management and for perception of environmental signals. These findings go a long way towards explaining the incredible diversity and success of the diatoms in contemporary oceans. Title: The Chlamydomonas genome reveals the evolution of key animal and plant functions Merchant SS, Prochnik SE, Vallon O, Harris EH, Karpowicz SJ, Witman GB, Terry A, Salamov A, Fritz-Laylin LK and Grossman AR <107 more author(s)> Merchant SS, Prochnik SE, Vallon O, Harris EH, Karpowicz SJ, Witman GB, Terry A, Salamov A, Fritz-Laylin LK, Marechal-Drouard L, Marshall WF, Qu LH, Nelson DR, Sanderfoot AA, Spalding MH, Kapitonov VV, Ren Q, Ferris P, Lindquist E, Shapiro H, Lucas SM, Grimwood J, Schmutz J, Cardol P, Cerutti H, Chanfreau G, Chen CL, Cognat V, Croft MT, Dent R, Dutcher S, Fernandez E, Fukuzawa H, Gonzalez-Ballester D, Gonzalez-Halphen D, Hallmann A, Hanikenne M, Hippler M, Inwood W, Jabbari K, Kalanon M, Kuras R, Lefebvre PA, Lemaire SD, Lobanov AV, Lohr M, Manuell A, Meier I, Mets L, Mittag M, Mittelmeier T, Moroney JV, Moseley J, Napoli C, Nedelcu AM, Niyogi K, Novoselov SV, Paulsen IT, Pazour G, Purton S, Ral JP, Riano-Pachon DM, Riekhof W, Rymarquis L, Schroda M, Stern D, Umen J, Willows R, Wilson N, Zimmer SL, Allmer J, Balk J, Bisova K, Chen CJ, Elias M, Gendler K, Hauser C, Lamb MR, Ledford H, Long JC, Minagawa J, Page MD, Pan J, Pootakham W, Roje S, Rose A, Stahlberg E, Terauchi AM, Yang P, Ball S, Bowler C, Dieckmann CL, Gladyshev VN, Green P, Jorgensen R, Mayfield S, Mueller-Roeber B, Rajamani S, Sayre RT, Brokstein P, Dubchak I, Goodstein D, Hornick L, Huang YW, Jhaveri J, Luo Y, Martinez D, Ngau WC, Otillar B, Poliakov A, Porter A, Szajkowski L, Werner G, Zhou K, Grigoriev IV, Rokhsar DS, Grossman AR (- 107) Ref: Science, 318:245, 2007 : PubMed ESTHER: Merchant_2007_Science_318_245 PubMedSearch: Merchant 2007 Science 318 245 PubMedID: 17932292 Gene_locus related to this paper: chlre-a0a2k3e2k6, chlre-a8hmd4, chlre-a8hqa9, chlre-a8htq0, chlre-a8hus6.1, chlre-a8hus6.2, chlre-a8icg4, chlre-a8iwm0, chlre-a8ize5, chlre-a8j2s9, chlre-a8j5w6, chlre-a8j7f8, chlre-a8j8u9, chlre-a8j8v0, chlre-a8j9u6, chlre-a8j143, chlre-a8j248, chlre-a8jd32, chlre-a8jd42, chlre-a8jgj2, chlre-a8jhc8, chlre-a8jhe5, chlre-a8iwj1, chlre-a8j7d5, chlre-a0a2k3dii0 Abstract Chlamydomonas reinhardtii is a unicellular green alga whose lineage diverged from land plants over 1 billion years ago. It is a model system for studying chloroplast-based photosynthesis, as well as the structure, assembly, and function of eukaryotic flagella (cilia), which were inherited from the common ancestor of plants and animals, but lost in land plants. We sequenced the approximately 120-megabase nuclear genome of Chlamydomonas and performed comparative phylogenomic analyses, identifying genes encoding uncharacterized proteins that are likely associated with the function and biogenesis of chloroplasts or eukaryotic flagella. Analyses of the Chlamydomonas genome advance our understanding of the ancestral eukaryotic cell, reveal previously unknown genes associated with photosynthetic and flagellar functions, and establish links between ciliopathy and the composition and function of flagella. Title: The tiny eukaryote Ostreococcus provides genomic insights into the paradox of plankton speciation Palenik B, Grimwood J, Aerts A, Rouze P, Salamov A, Putnam N, Dupont C, Jorgensen R, Derelle E and Grigoriev IV <28 more author(s)> Palenik B, Grimwood J, Aerts A, Rouze P, Salamov A, Putnam N, Dupont C, Jorgensen R, Derelle E, Rombauts S, Zhou K, Otillar R, Merchant SS, Podell S, Gaasterland T, Napoli C, Gendler K, Manuell A, Tai V, Vallon O, Piganeau G, Jancek S, Heijde M, Jabbari K, Bowler C, Lohr M, Robbens S, Werner G, Dubchak I, Pazour GJ, Ren Q, Paulsen I, Delwiche C, Schmutz J, Rokhsar D, Van de Peer Y, Moreau H, Grigoriev IV (- 28) Ref: Proc Natl Acad Sci U S A, 104:7705, 2007 : PubMed ESTHER: Palenik_2007_Proc.Natl.Acad.Sci.U.S.A_104_7705 PubMedSearch: Palenik 2007 Proc.Natl.Acad.Sci.U.S.A 104 7705 PubMedID: 17460045 Gene_locus related to this paper: ostlu-a4rrl5, ostlu-a4ruh2, ostlu-a4rut7, ostlu-a4ruy3, ostlu-a4rxn1, ostlu-a4ry37, ostlu-a4s2e6, ostlu-a4s2y4, ostlu-a4s3d7, ostlu-a4s4v4, ostlu-a4s5e4, ostlu-a4s5y6, ostlu-a4s7a8, ostlu-a4s7z5, ostlu-a4s8g3, ostlu-a4s8n8, ostlu-a4s8s1, ostlu-a4s958, ostlu-a4sac2, ostlu-a4saz3, ostlu-a4sbb7, ostlu-a4s6q5, ostlu-a4s1q9, ostlu-a4s8b2, ostlu-a4s262 Abstract The smallest known eukaryotes, at approximately 1-mum diameter, are Ostreococcus tauri and related species of marine phytoplankton. The genome of Ostreococcus lucimarinus has been completed and compared with that of O. tauri. This comparison reveals surprising differences across orthologous chromosomes in the two species from highly syntenic chromosomes in most cases to chromosomes with almost no similarity. Species divergence in these phytoplankton is occurring through multiple mechanisms acting differently on different chromosomes and likely including acquisition of new genes through horizontal gene transfer. We speculate that this latter process may be involved in altering the cell-surface characteristics of each species. In addition, the genome of O. lucimarinus provides insights into the unique metal metabolism of these organisms, which are predicted to have a large number of selenocysteine-containing proteins. Selenoenzymes are more catalytically active than similar enzymes lacking selenium, and thus the cell may require less of that protein. As reported here, selenoenzymes, novel fusion proteins, and loss of some major protein families including ones associated with chromatin are likely important adaptations for achieving a small cell size. Title: Genome analysis of the smallest free-living eukaryote Ostreococcus tauri unveils many unique features Derelle E, Ferraz C, Rombauts S, Rouze P, Worden AZ, Robbens S, Partensky F, Degroeve S, Echeynie S and Moreau H <16 more author(s)> Derelle E, Ferraz C, Rombauts S, Rouze P, Worden AZ, Robbens S, Partensky F, Degroeve S, Echeynie S, Cooke R, Saeys Y, Wuyts J, Jabbari K, Bowler C, Panaud O, Piegu B, Ball SG, Ral JP, Bouget FY, Piganeau G, De Baets B, Picard A, Delseny M, Demaille J, Van de Peer Y, Moreau H (- 16) Ref: Proc Natl Acad Sci U S A, 103:11647, 2006 : PubMed ESTHER: Derelle_2006_Proc.Natl.Acad.Sci.U.S.A_103_11647 PubMedSearch: Derelle 2006 Proc.Natl.Acad.Sci.U.S.A 103 11647 PubMedID: 16868079 Gene_locus related to this paper: ostta-q00t45, ostta-q00te9, ostta-q00tt1, ostta-q00tx0, ostta-q00v73, ostta-q00vq9, ostta-q00w59, ostta-q00y09, ostta-q00y84, ostta-q00ys6, ostta-q01ca2, ostta-q01ca8, ostta-q01ck9, ostta-q01dg2, ostta-q01e72, ostta-q01fz0, ostta-q01g03, ostta-q01gl9, ostta-q010m0, ostta-q011b1, ostta-q011b9, ostta-q011x6, ostta-q018f5, ostta-q018x2, ostta-q00wt8, ostta-a0a090md33, ostta-q00ua3, ostta-a0a090m3x7 Abstract The green lineage is reportedly 1,500 million years old, evolving shortly after the endosymbiosis event that gave rise to early photosynthetic eukaryotes. In this study, we unveil the complete genome sequence of an ancient member of this lineage, the unicellular green alga Ostreococcus tauri (Prasinophyceae). This cosmopolitan marine primary producer is the world's smallest free-living eukaryote known to date. Features likely reflecting optimization of environmentally relevant pathways, including resource acquisition, unusual photosynthesis apparatus, and genes potentially involved in C(4) photosynthesis, were observed, as was downsizing of many gene families. Overall, the 12.56-Mb nuclear genome has an extremely high gene density, in part because of extensive reduction of intergenic regions and other forms of compaction such as gene fusion. However, the genome is structurally complex. It exhibits previously unobserved levels of heterogeneity for a eukaryote. Two chromosomes differ structurally from the other eighteen. Both have a significantly biased G+C content, and, remarkably, they contain the majority of transposable elements. Many chromosome 2 genes also have unique codon usage and splicing, but phylogenetic analysis and composition do not support alien gene origin. In contrast, most chromosome 19 genes show no similarity to green lineage genes and a large number of them are specialized in cell surface processes. Taken together, the complete genome sequence, unusual features, and downsized gene families, make O. tauri an ideal model system for research on eukaryotic genome evolution, including chromosome specialization and green lineage ancestry. | |||||||
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