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Evidence for the retention of two evolutionary distinct plastids in dinoflagellates with diatom endosymbionts.
Hehenberger, Elisabeth; Imanian, Behzad; Burki, Fabien; Keeling, Patrick J.
Afiliação
  • Hehenberger E; Department of Botany, Canadian Institute for Advanced Research, University of British Columbia, Vancouver, British Columbia, Canada helisabe@mail.ubc.ca.
  • Imanian B; Department of Botany, Canadian Institute for Advanced Research, University of British Columbia, Vancouver, British Columbia, Canada.
  • Burki F; Department of Botany, Canadian Institute for Advanced Research, University of British Columbia, Vancouver, British Columbia, Canada.
  • Keeling PJ; Department of Botany, Canadian Institute for Advanced Research, University of British Columbia, Vancouver, British Columbia, Canada.
Genome Biol Evol ; 6(9): 2321-34, 2014 Sep.
Article em En | MEDLINE | ID: mdl-25172904
ABSTRACT
Dinoflagellates harboring diatom endosymbionts (termed "dinotoms") have undergone a process often referred to as "tertiary endosymbiosis"--the uptake of algae containing secondary plastids and integration of those plastids into the new host. In contrast to other tertiary plastids, and most secondary plastids, the endosymbiont of dinotoms is distinctly less reduced, retaining a number of cellular features, such as their nucleus and mitochondria and others, in addition to their plastid. This has resulted in redundancy between host and endosymbiont, at least between some mitochondrial and cytosolic metabolism, where this has been investigated. The question of plastidial redundancy is particularly interesting as the fate of the host dinoflagellate plastid is unclear. The host cytosol possesses an eyespot that has been postulated to be a remnant of the ancestral peridinin plastid, but this has not been tested, nor has its possible retention of plastid functions. To investigate this possibility, we searched for plastid-associated pathways and functions in transcriptomic data sets from three dinotom species. We show that the dinoflagellate host has indeed retained genes for plastid-associated pathways and that these genes encode targeting peptides similar to those of other dinoflagellate plastid-targeted proteins. Moreover, we also identified one gene encoding an essential component of the dinoflagellate plastid protein import machinery, altogether suggesting the presence of a functioning plastid import system in the host, and by extension a relict plastid. The presence of the same plastid-associated pathways in the endosymbiont also extends the known functional redundancy in dinotoms, further confirming the unusual state of plastid integration in this group of dinoflagellates.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Simbiose / Dinoflagellida / Diatomáceas / Plastídeos / Evolução Biológica Idioma: En Revista: Genome Biol Evol Assunto da revista: BIOLOGIA / BIOLOGIA MOLECULAR Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Canadá

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Simbiose / Dinoflagellida / Diatomáceas / Plastídeos / Evolução Biológica Idioma: En Revista: Genome Biol Evol Assunto da revista: BIOLOGIA / BIOLOGIA MOLECULAR Ano de publicação: 2014 Tipo de documento: Article País de afiliação: Canadá