NDLI: The single, ancient origin of chromist plastids.

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The single, ancient origin of chromist plastids.

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The single, ancient origin of chromist plastids.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bhattacharya, Debashish Yoon, Hwan Su Pinto, Gabriele Hackett, Jeremiah D.
Description	Author Affiliation: Yoon HS ( Department of Biological Sciences and Center for Comparative Genomics, University of Iowa, 210 Biology Building, Iowa City 52242, USA.);
Abstract	Algae include a diverse array of photosynthetic eukaryotes excluding land plants. Explaining the origin of algal plastids continues to be a major challenge in evolutionary biology. Current knowledge suggests that plastid primary endosymbiosis, in which a single-celled protist engulfs and 'enslaves' a cyanobacterium, likely occurred once and resulted in the primordial alga. This eukaryote then gave rise through vertical evolution to the red, green, and glaucophyte algae. However, some modern algal lineages have a more complicated evolutionary history involving a secondary endosymbiotic event, in which a protist engulfed an existing eukaryotic alga (rather than a cyanobacterium), which was then reduced to a secondary plastid. Secondary endosymbiosis explains the majority of algal biodiversity, yet the number and timing of these events is unresolved. Here we analyzed a five-gene plastid data set to show that a taxonomically diverse group of chlorophyll c(2)-containing protists comprising cryptophyte, haptophyte, and stramenopiles algae (Chromista) share a common plastid that most likely arose from a single, ancient ( approximately 1,260 million years ago) secondary endosymbiosis involving a red alga. This finding is consistent with Chromista monophyly and implicates secondary endosymbiosis as an important force in generating eukaryotic biodiversity.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	24
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Phylogeny Plastids Rhodophyta Symbiosis Algal Proteins Genetics Chlorophyll DNA, Complementary Ecosystem Genes, Plant Models, Genetic Molecular Sequence Data Photosynthesis Reverse Transcriptase Polymerase Chain Reaction Ultrastructure Sequence Alignment Sequence Homology, Nucleic Acid Comparative Study Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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