title: Compositional gene landscapes in vertebrates.
abstract: The existence of a well conserved linear relationship between GC levels of genes' second and third codon positions (GC2, GC3) prompted us to focus on the landscape, or joint distribution, spanned by these two variables. In human, well curated coding sequences now cover at least 15%-30% of the estimated total gene set. Our analysis of the landscape defined by this gene set revealed not only the well documented linear crest, but also the presence of several peaks and valleys along that crest, a property that was also indicated in two other warm-blooded vertebrates represented by large gene databases, that is, mouse and chicken. GC2 is the sum of eight amino acid frequencies, whereas GC3 is linearly related to the GC level of the chromosomal region containing the gene. The landscapes therefore portray relations between proteins and the DNA environments of the genes that encode them.
authors.affiliation: Laboratorio di Evoluzione Molecolare, Stazione Zoologica Anton Dohrn, 80121 Napoli, Italy.
authors.forename: Stéphane
authors.initials: S
authors.lastname: Cruveiller
authors.forename: Kamel
authors.initials: K
authors.lastname: Jabbari
authors.forename: Oliver
authors.initials: O
authors.lastname: Clay
authors.forename: Giorgio
authors.initials: G
authors.lastname: Bernardi
mesh_terms: D000818:Animals; D002645:Chickens / Q000235:genetics*; D019295:Computational Biology / Q000706:statistics & numerical data*; D020869:Gene Expression Profiling / Q000706:statistics & numerical data*; D006801:Humans; D051379:Mice; D014176:Protein Biosynthesis; D011506:Proteins / Q000235:genetics; D013045:Species Specificity; D014982:Xenopus laevis / Q000235:genetics*
chemical_list: D011506:Proteins