Ancient gene duplication and differential gene flow in plastid lineages: the GroEL/Cpn60 example

Cryptomonads, small biflagellate algae, contain four different genomes. In addition to the nucleus, mitochondrion, and chloroplast is a fourth DNA-containing organelle the nucleomorph. Nucleomorphs result from the successive reduction of the nucleus of an engulfed phototrophic eukaryotic endosymbion...

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Bibliographic Details
Published in:Journal of molecular evolution 1999, Vol.48 (1), p.112-117
Main Authors: Wastl, J, Fraunholz, M, Zauner, S, Douglas, S, Maier, U.G
Format: Article
Language:English
Subjects:
Algae
algae and seaweeds
Amino Acid Sequence
amino acid sequences
Chaperonin 60 - genetics
Chlorophyll
chloroplast DNA
Chloroplasts
Chloroplasts - genetics
Chromosomes
complementary DNA
cpn60 gene
duplication
Eukaryota - classification
Eukaryota - genetics
Eukaryotes
Evolution, Molecular
Gene Duplication
Genes, Plant - genetics
genome
Genomics
groel gene
guillardia theta
Molecular Sequence Data
nucleomorph genome
nucleotide sequences
open reading frames
Phylogeny
Plant Proteins - genetics
Plastids
Plastids - genetics
proteins
Sequence Homology, Amino Acid
Space life sciences
structural genes
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Summary:Cryptomonads, small biflagellate algae, contain four different genomes. In addition to the nucleus, mitochondrion, and chloroplast is a fourth DNA-containing organelle the nucleomorph. Nucleomorphs result from the successive reduction of the nucleus of an engulfed phototrophic eukaryotic endosymbiont by a secondary eukaryotic host cell. By sequencing the chloroplast genome and the nucleomorph chromosomes, we identified a groEL homologue in the genome of the chloroplast and a related cpn60 in one of the nucleomorph chromosomes. The nucleomorph-encoded Cpn60 and the chloroplast-encoded GroEL correspond in each case to one of the two divergent GroEL homologues in the cyanobacterium Synechocystis sp. PCC6803. The coexistence of divergent groEL/cpn60 genes in different genomes in one cell offers insights into gene transfer from evolving chloroplasts to cell nuclei and convergent gene evolution in chlorophyll a/b versus chlorophyll a/c/phycobilin eukaryotic lineages.
ISSN:0022-2844
1432-1432
DOI:10.1007/pl00006438