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Nucleomorph genomes: structure, function, origin and evolution

Summary: Nucleomorph genomes: structure,
function, origin and evolution
John M. Archibald
The cryptomonads and chlorarachniophytes are two
unicellular algal lineageswith complex cellular structures
and fascinating evolutionary histories. Both groups
acquired their photosynthetic abilities through the as-
similation of eukaryotic endosymbionts. As a result, they
possess two distinct cytosolic compartments and four
genomes--two nuclear genomes, an endosymbiont-
derived plastid genome and a mitochondrial genome
derived from the host cell. Like mitochondrial and plastid
genomes, the genome of the endosymbiont nucleus, or
`nucleomorph', of cryptomonad and chlorarachniophyte
cells has been greatly reduced through the combined
effects of gene loss and intracellular gene transfer. This
article focuses on the structure, function, origin and
evolution of cryptomonad and chlorarachniophyte nu-
cleomorph genomes in light of recent comparisons of


Source: Archibald, John - Department of Biochemistry and Molecular Biology, Dalhousie University


Collections: Biology and Medicine