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2017 ; 8
(ä): 1540
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Re-analyses of "Algal" Genes Suggest a Complex Evolutionary History of Oomycetes
#MMPMID28932232
Wang Q
; Sun H
; Huang J
Front Plant Sci
2017[]; 8
(ä): 1540
PMID28932232
show ga
The spread of photosynthesis is one of the most important but constantly debated
topics in eukaryotic evolution. Various hypotheses have been proposed to explain
the plastid distribution in extant eukaryotes. Notably, the chromalveolate
hypothesis suggested that multiple eukaryotic lineages were derived from a
photosynthetic ancestor that had a red algal endosymbiont. As such, genes of
plastid/algal origin in aplastidic chromalveolates, such as oomycetes, were
considered to be important supporting evidence. Although the chromalveolate
hypothesis has been seriously challenged, some of its supporting evidence has not
been carefully investigated. In this study, we re-evaluate the "algal" genes from
oomycetes with a larger sampling and careful phylogenetic analyses. Our data
provide no conclusive support for a common photosynthetic ancestry of
stramenopiles, but show that the initial estimate of "algal" genes in oomycetes
was drastically inflated due to limited genome data available then for certain
eukaryotic lineages. These findings also suggest that the evolutionary histories
of these "algal" genes might be attributed to complex scenarios such as
differential gene loss, serial endosymbioses, or horizontal gene transfer.