Complete Plastid Genome Sequences of Three Rosids (Castanea, Prunus, Theobroma): Evidence for At Least Two Independent Transfers of rpl22 to the Nucleus
Identifieur interne : 001A90 ( Main/Exploration ); précédent : 001A89; suivant : 001A91Complete Plastid Genome Sequences of Three Rosids (Castanea, Prunus, Theobroma): Evidence for At Least Two Independent Transfers of rpl22 to the Nucleus
Auteurs : Robert K. Jansen [États-Unis] ; Christopher Saski ; Seung-Bum Lee ; Anne K. Hansen [États-Unis] ; Henry DaniellSource :
- Molecular Biology and Evolution [ 0737-4038 ] ; 2010.
Abstract
Functional gene transfer from the plastid to the nucleus is rare among land plants despite evidence that DNA transfer to the nucleus is relatively frequent. During the course of sequencing plastid genomes from representative species from three rosid genera (
Url:
DOI: 10.1093/molbev/msq261
PubMed: 20935065
PubMed Central: 3108605
Affiliations:
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, <italic>Prunus</italic>
, <italic>Theobroma</italic>
): Evidence for At Least Two Independent Transfers of <italic>rpl22</italic>
to the Nucleus</title>
<author><name sortKey="Jansen, Robert K" sort="Jansen, Robert K" uniqKey="Jansen R" first="Robert K." last="Jansen">Robert K. Jansen</name>
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<region type="state">Texas</region>
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<orgName type="university">Université du Texas à Austin</orgName>
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<author><name sortKey="Saski, Christopher" sort="Saski, Christopher" uniqKey="Saski C" first="Christopher" last="Saski">Christopher Saski</name>
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<author><name sortKey="Lee, Seung Bum" sort="Lee, Seung Bum" uniqKey="Lee S" first="Seung-Bum" last="Lee">Seung-Bum Lee</name>
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<wicri:noCountry code="subfield">University of Central Florida</wicri:noCountry>
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<author><name sortKey="Hansen, Anne K" sort="Hansen, Anne K" uniqKey="Hansen A" first="Anne K." last="Hansen">Anne K. Hansen</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Complete Plastid Genome Sequences of Three Rosids (<italic>Castanea</italic>
, <italic>Prunus</italic>
, <italic>Theobroma</italic>
): Evidence for At Least Two Independent Transfers of <italic>rpl22</italic>
to the Nucleus</title>
<author><name sortKey="Jansen, Robert K" sort="Jansen, Robert K" uniqKey="Jansen R" first="Robert K." last="Jansen">Robert K. Jansen</name>
<affiliation wicri:level="4"><nlm:aff id="aff1">Section of Integrative Biology and Institute of Cellular and Molecular Biology, The University of Texas at Austin</nlm:aff>
<country>États-Unis</country>
<placeName><settlement type="city">Austin (Texas)</settlement>
<region type="state">Texas</region>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
</author>
<author><name sortKey="Saski, Christopher" sort="Saski, Christopher" uniqKey="Saski C" first="Christopher" last="Saski">Christopher Saski</name>
<affiliation><nlm:aff id="aff2">Clemson University, Genomics Institute</nlm:aff>
<wicri:noCountry code="subfield">Genomics Institute</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Lee, Seung Bum" sort="Lee, Seung Bum" uniqKey="Lee S" first="Seung-Bum" last="Lee">Seung-Bum Lee</name>
<affiliation><nlm:aff id="aff3">Department of Molecular Biology and Microbiology, University of Central Florida</nlm:aff>
<wicri:noCountry code="subfield">University of Central Florida</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Hansen, Anne K" sort="Hansen, Anne K" uniqKey="Hansen A" first="Anne K." last="Hansen">Anne K. Hansen</name>
<affiliation wicri:level="4"><nlm:aff id="aff1">Section of Integrative Biology and Institute of Cellular and Molecular Biology, The University of Texas at Austin</nlm:aff>
<country>États-Unis</country>
<placeName><settlement type="city">Austin (Texas)</settlement>
<region type="state">Texas</region>
</placeName>
<orgName type="university">Université du Texas à Austin</orgName>
</affiliation>
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<author><name sortKey="Daniell, Henry" sort="Daniell, Henry" uniqKey="Daniell H" first="Henry" last="Daniell">Henry Daniell</name>
<affiliation><nlm:aff id="aff3">Department of Molecular Biology and Microbiology, University of Central Florida</nlm:aff>
<wicri:noCountry code="subfield">University of Central Florida</wicri:noCountry>
</affiliation>
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<series><title level="j">Molecular Biology and Evolution</title>
<idno type="ISSN">0737-4038</idno>
<idno type="eISSN">1537-1719</idno>
<imprint><date when="2010">2010</date>
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<front><div type="abstract" xml:lang="en"><p>Functional gene transfer from the plastid to the nucleus is rare among land plants despite evidence that DNA transfer to the nucleus is relatively frequent. During the course of sequencing plastid genomes from representative species from three rosid genera (<italic>Castanea</italic>
, <italic>Prunus</italic>
, <italic>Theobroma</italic>
) and ongoing projects focusing on the Fagaceae and Passifloraceae, we identified putative losses of <italic>rpl22</italic>
in these two angiosperm families. We further characterized <italic>rpl22</italic>
from three species of <italic>Passiflora</italic>
and one species of <italic>Quercus</italic>
and identified sequences that likely represent pseudogenes. In <italic>Castanea</italic>
and <italic>Quercus</italic>
, both members of the Fagaceae, we identified a nuclear copy of <italic>rpl22</italic>
, which consisted of two exons separated by an intron. Exon 1 encodes a transit peptide that likely targets the protein product back to the plastid and exon 2 encodes <italic>rpl22</italic>
. We performed phylogenetic analyses of 97 taxa, including 93 angiosperms and four gymnosperm outgroups using alignments of 81 plastid genes to examine the phylogenetic distribution of <italic>rpl22</italic>
loss and transfer to the nucleus. Our results indicate that within rosids there have been independent transfers of <italic>rpl22</italic>
to the nucleus in Fabaceae and Fagaceae and a putative third transfer in <italic>Passiflora</italic>
. The high level of sequence divergence between the transit peptides in Fabaceae and Fagaceae strongly suggest that these represent independent transfers. Furthermore, Blast searches did not identify the “donor” genes of the transit peptides, suggesting a de novo origin. We also performed phylogenetic analyses of <italic>rpl22</italic>
for 87 angiosperms and four gymnosperms, including nuclear-encoded copies for five species of Fabaceae and Fagaceae. The resulting trees indicated that the transfer of <italic>rpl22</italic>
to the nucleus does not predate the origin of angiosperms as suggested in an earlier study. Using previously published angiosperm divergence time estimates, we suggest that these transfers occurred approximately 56–58, 34–37, and 26–27 Ma for the Fabaceae, Fagaceae, and Passifloraceae, respectively.</p>
</div>
</front>
</TEI>
<affiliations><list><country><li>États-Unis</li>
</country>
<region><li>Texas</li>
</region>
<settlement><li>Austin (Texas)</li>
</settlement>
<orgName><li>Université du Texas à Austin</li>
</orgName>
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<tree><noCountry><name sortKey="Daniell, Henry" sort="Daniell, Henry" uniqKey="Daniell H" first="Henry" last="Daniell">Henry Daniell</name>
<name sortKey="Lee, Seung Bum" sort="Lee, Seung Bum" uniqKey="Lee S" first="Seung-Bum" last="Lee">Seung-Bum Lee</name>
<name sortKey="Saski, Christopher" sort="Saski, Christopher" uniqKey="Saski C" first="Christopher" last="Saski">Christopher Saski</name>
</noCountry>
<country name="États-Unis"><region name="Texas"><name sortKey="Jansen, Robert K" sort="Jansen, Robert K" uniqKey="Jansen R" first="Robert K." last="Jansen">Robert K. Jansen</name>
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<name sortKey="Hansen, Anne K" sort="Hansen, Anne K" uniqKey="Hansen A" first="Anne K." last="Hansen">Anne K. Hansen</name>
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