[en] We have investigated the hypothesis that pyrimidine dinucleotides are avoided in light-exposed genomes as the result of selective pressure due to high ultraviolet (UV) exposure. The main damage to DNA produced by UV radiation is known to be the formation of pyrimidine photoproducts: it is estimated that about 10 dimers per minute are formed in an Escherichia coli chromosome exposed to the UV light in direct overhead sunlight at sea level. It is also known that on an E. coli chromosome exposed to UVb wavelengths (290-320 nm), pyrimidine photoproducts are formed in the following proportions: 59 TpT, 7 CpC, and 34 CpT plus TpC. We have analyzed all available complete prokaryotic genomes and the model organism Prochlorococcus marinus and have found that pyrimidine dinucleotides are not systematically avoided. This suggests that prokaryotes must have sufficiently effective protection and repair systems for UV exposure to not affect their dinucleotide composition.
Disciplines :
Life sciences: Multidisciplinary, general & others
Author, co-author :
Palmeira, Leonor ; Université de Liège - ULiège > Immunologie et vaccinologie
Gueguen, Laurent
Lobry, Jean R
Language :
English
Title :
UV-targeted dinucleotides are not depleted in light-exposed prokaryotic genomes
Publication date :
2006
Journal title :
Molecular Biology and Evolution
ISSN :
0737-4038
eISSN :
1537-1719
Publisher :
Oxford University Press, New York, United States - New York
Laboratoire de Biométrie et Biologie Evolutive (UMR 5558); Centre National de la Recherche Scientifique (CNRS); Univ. Lyon 1, 43 bd 11. nov, 69622, Villeurbanne, Cedex, France. palmeira@biomserv.univ-lyon1.fr
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