Molecular Biology and Evolution, Vol 14, 1062-1074, Copyright © 1997 by Society for Molecular Biology and Evolution
E Coissac, E Maillier and P Netter
The genomes of three bacteria (Haemophilus influenzae, Mycoplasma
genitalium, and Escherichia coli) and two eukaryotes (Saccharomyces
cerevisiae and Caenorhabditis elegans) were compared. The distribution of
their putative open reading frames (ORFs) was studied, and several
conclusions were drawn: (1) All of these genomes, even the smallest,
exhibit a significant proportion (7%-30%) of duplicated ORFs. This
proportion is a function of genome size and appears unrelated to the
bacteria/eukaryote division. (2) Some of these ORFs constitute families of
up 20 or more members. (3) The levels of sequence similarity within these
families are highly variable and their distribution is different among
bacteria and eukaryotes. (4) In yeast, there are topological relationships
between members of the same family. The paired ORFs are frequently in the
same orientation with regard to their respective telomeres and located at
comparable distances from them.
ORIGINAL ARTICLE
A comparative study of duplications in bacteria and eukaryotes: the importance of telomeres
Institut Jacques Monod, Paris, France.
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