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Lateral gene transfer and the evolution of plastid-targeted proteins in the secondary

Summary: Lateral gene transfer and the evolution of
plastid-targeted proteins in the secondary
plastid-containing alga Bigelowiella natans
John M. Archibald, Matthew B. Rogers, Michael Toop, Ken-ichiro Ishida*, and Patrick J. Keeling
Canadian Institute for Advanced Research, Program in Evolutionary Biology, Department of Botany, University of British Columbia, 3529-6270 University
Boulevard, Vancouver, BC, Canada V6T 1Z4
Edited by Jeffrey Donald Palmer, Indiana University, Bloomington, IN, and approved April 18, 2003 (received for review February 18, 2003)
Chlorarachniophytes are amoeboflagellate algae that acquired
photosynthesis secondarily by engulfing a green alga and retain-
ing its plastid (chloroplast). An important consequence of second-
ary endosymbiosis in chlorarachniophytes is that most of the
nuclear genes encoding plastid-targeted proteins have moved
from the nucleus of the endosymbiont to the host nucleus. We
have sequenced and analyzed 83 cDNAs encoding 78 plastid-
targeted proteins from the model chlorarachniophyte Bigelowiella
natans (formerly Chlorarachnion sp. CCMP621). Phylogenies in-
ferred from the majority of these genes are consistent with a
chlorophyte green algal origin. However, a significant number of
genes ( 21%) show signs of having been acquired by lateral gene
transfer from numerous other sources: streptophyte algae, red


Source: Archibald, John - Department of Biochemistry and Molecular Biology, Dalhousie University
Keeling, Patrick - Department of Botany, University of British Columbia


Collections: Biology and Medicine; Environmental Sciences and Ecology