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Logo of bmcgenoBioMed Centralsearchsubmit a manuscriptregisterthis articleBMC Genomics
 
BMC Genomics. 2009; 10: 616.
Published online Dec 17, 2009. doi:  10.1186/1471-2164-10-616
PMCID: PMC2810307
The complete genome sequence of Xanthomonas albilineans provides new insights into the reductive genome evolution of the xylem-limited Xanthomonadaceae
Isabelle Pieretti,#1 Monique Royer,#1 Valérie Barbe,2 Sébastien Carrere,3 Ralf Koebnik,4 Stéphane Cociancich,1 Arnaud Couloux,2 Armelle Darrasse,5 Jérôme Gouzy,3 Marie-Agnès Jacques,5 Emmanuelle Lauber,3 Charles Manceau,5 Sophie Mangenot,2 Stéphane Poussier,6 Béatrice Segurens,2 Boris Szurek,4 Valérie Verdier,4 Matthieu Arlat,7 and Philippe Rottcorresponding author1
1CIRAD, UMR 385 BGPI, Campus international de Baillarguet, TA A-54K, F-34398 Montpellier Cedex 5, France
2Génoscope, Centre national de séquençage, CEA/DSV/IG/Genoscope, 2 rue Gaston Cremieux, F-91057 Evry Cedex, France
3Laboratoire des Interactions Plantes Micro-organismes (LIPM), UMR CNRS-INRA 2594/441, F-31320 Castanet-Tolosan, France
4Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia - CNRS - IRD, UMR 5096, 911 Avenue Agropolis, BP 64501, F-34394 Montpellier cedex 5, France
5INRA, UMR 077 PaVé, F-49071 Beaucouzé, France
6Agrocampus Ouest centre d'Angers, UMR 077 PaVé, F-49071 Beaucouzé, France
7Université de Toulouse, UPS, 118 Route de Narbonne, F-31062 Toulouse, France
corresponding authorCorresponding author.
#Contributed equally.
Isabelle Pieretti: isabelle.pieretti/at/cirad.fr; Monique Royer: monique.royer/at/cirad.fr; Valérie Barbe: vbarbe/at/genoscope.cns.fr; Sébastien Carrere: Sebastien.Carrere/at/toulouse.inra.fr; Ralf Koebnik: Ralf.Koebnik/at/mpl.ird.fr; Stéphane Cociancich: stephane.cociancich/at/cirad.fr; Arnaud Couloux: acouloux/at/genoscope.cns.fr; Armelle Darrasse: Armelle.Darrasse/at/angers.inra.fr; Jérôme Gouzy: gouzy/at/toulouse.inra.fr; Marie-Agnès Jacques: Marie-Agnes.Jacques/at/angers.inra.fr; Emmanuelle Lauber: Emmanuelle.Lauber/at/toulouse.inra.fr; Charles Manceau: charles.manceau/at/angers.inra.fr; Sophie Mangenot: mangenot/at/genoscope.cns.fr; Stéphane Poussier: Stephane.Poussier/at/agrocampus-ouest.fr; Béatrice Segurens: segurens/at/genoscope.cns.fr; Boris Szurek: boris.szurek/at/mpl.ird.fr; Valérie Verdier: Valerie.Verdier/at/ird.fr; Matthieu Arlat: Matthieu.Arlat/at/toulouse.inra.fr; Philippe Rott: philippe.rott/at/cirad.fr
Received July 9, 2009; Accepted December 17, 2009.
Abstract
Background
The Xanthomonadaceae family contains two xylem-limited plant pathogenic bacterial species, Xanthomonas albilineans and Xylella fastidiosa. X. fastidiosa was the first completely sequenced plant pathogen. It is insect-vectored, has a reduced genome and does not possess hrp genes which encode a Type III secretion system found in most plant pathogenic bacteria. X. fastidiosa was excluded from the Xanthomonas group based on phylogenetic analyses with rRNA sequences.
Results
The complete genome of X. albilineans was sequenced and annotated. X. albilineans, which is not known to be insect-vectored, also has a reduced genome and does not possess hrp genes. Phylogenetic analysis using X. albilineans genomic sequences showed that X. fastidiosa belongs to the Xanthomonas group. Order of divergence of the Xanthomonadaceae revealed that X. albilineans and X. fastidiosa experienced a convergent reductive genome evolution during their descent from the progenitor of the Xanthomonas genus. Reductive genome evolutions of the two xylem-limited Xanthomonadaceae were compared in light of their genome characteristics and those of obligate animal symbionts and pathogens.
Conclusion
The two xylem-limited Xanthomonadaceae, during their descent from a common ancestral parent, experienced a convergent reductive genome evolution. Adaptation to the nutrient-poor xylem elements and to the cloistered environmental niche of xylem vessels probably favoured this convergent evolution. However, genome characteristics of X. albilineans differ from those of X. fastidiosa and obligate animal symbionts and pathogens, indicating that a distinctive process was responsible for the reductive genome evolution in this pathogen. The possible role in genome reduction of the unique toxin albicidin, produced by X. albilineans, is discussed.
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