Red and Green Algal Monophyly and Extensive Gene Sharing Found in a Rich Repertoire of Red Algal Genes

Chan, Cheong Xin; Yang, Eun Chan; Banerjee, Titas; Yoon, Hwan Su; Martone, Patrick T.; Estevez, Jose M.; Bhattacharya, Debashish


The Plantae comprising red, green (including land plants), and glaucophyte algae are postulated to have a single common ancestor that is the founding lineage of photosynthetic eukaryotes [1, 2]. However, recent multiprotein phylogenies provide little [3, 4] or no [5, 6] support for this hypothesis. This may reflect limited complete genome data available for red algae, currently only the highly reduced genome of Cyanidioschyzon merolae [7], a reticulate gene ancestry [5], or variable gene divergence rates that mislead phylogenetic inference [8]. Here, using novel genome data from the mesophilic Porphyridium cruentum and Calliarthron tuberculosum, we analyze 60,000 novel red algal genes to test the monophyly of red + green (RG) algae and their extent of gene sharing with other lineages. Using a gene-by-gene approach, we find an emerging signal of RG monophyly (supported by similar to 50% of the examined protein phylogenies) that increases with the number of distinct phyla and terminal taxa in the analysis. A total of 1,808 phylogenies show evidence of gene sharing between Plantae and other lineages. We demonstrate that a rich mesophilic red algal gene repertoire is crucial for testing controversial issues in eukaryote evolution and for understanding the complex patterns of gene inheritance in protists.

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Título según WOS: ID WOS:000287767600027 Not found in local WOS DB
Título de la Revista: CURRENT BIOLOGY
Volumen: 21
Número: 4
Editorial: Cell Press
Fecha de publicación: 2011
Página de inicio: 328
Página final: 333


Notas: ISI