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Postsymbiotic plasmid acquisition and evolution of the repA1-replicon in Buchnera aphidicola

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dc.contributor Ministerio de Educación y Ciencia (España)
dc.contributor European Commission
dc.creator Ham, Roeland C.H.J. van
dc.creator Silva-Moreno, Francisco
dc.creator Sabater-Muñoz, Beatriz
dc.creator Moya-Simarro, Andrés
dc.creator Latorre-Castillo, Amparo
dc.creator González-Candela, Fernando
dc.date 2008-06-18T12:12:27Z
dc.date 2008-06-18T12:12:27Z
dc.date 2000-09
dc.date.accessioned 2017-01-31T01:44:03Z
dc.date.available 2017-01-31T01:44:03Z
dc.identifier Proc Natl Acad Sci U S A. 2000 September 26; 97(20): 10855–10860
dc.identifier 1091-6490
dc.identifier http://hdl.handle.net/10261/5184
dc.identifier.uri http://dspace.mediu.edu.my:8181/xmlui/handle/10261/5184
dc.description Copyright © by National Academy of Sciences. La versión original está disponible en http://www.pnas.org/
dc.description Buchnera aphidicola is an obligate, strictly vertically transmitted, bacterial symbiont of aphids. It supplies its host with essential amino acids, nutrients required by aphids but deficient in their diet of plant phloem sap. Several lineages of Buchnera show adaptation to their nutritional role in the form of plasmid-mediated amplification of key-genes involved in the biosynthesis of tryptophan (trpEG) and leucine (leuABCD). Phylogenetic analyses of these plasmid-encoded functions have thus far suggested the absence of horizontal plasmid exchange among lineages of Buchnera. Here, we describe three new Buchnera plasmids, obtained from species of the aphid host families Lachnidae and Pemphigidae. All three plasmids belong to the repA1 family of Buchnera plasmids, which is characterized by the presence of a repA1-replicon responsible for replication initiation. A comprehensive analysis of this family of plasmids unexpectedly revealed significantly incongruent phylogenies for different plasmid and chromosomally encoded loci. We infer from these incongruencies a case of horizontal plasmid transfer in Buchnera. This process may have been mediated by secondary endosymbionts, which occasionally undergo horizontal transmission in aphids.
dc.description This work was supported by an European Union Human Capital Mobility research grant (CHRX-CT94–0660 to R.V.H.) and Grant PB96–0793 C0401 from Dirección General de Ensenanza Superior (to A.M.).
dc.description Peer reviewed
dc.format 22195 bytes
dc.format application/pdf
dc.language eng
dc.publisher National Academy of Sciences (U.S.)
dc.rights openAccess
dc.title Postsymbiotic plasmid acquisition and evolution of the repA1-replicon in Buchnera aphidicola
dc.type Artículo

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