title: The correlation between genomic G+C and optimal growth temperature of prokaryotes is robust: a reply to Marashi and Ghalanbor.
abstract: We have recently shown that optimal growth temperature (T(opt)) is one of the factors that influence genomic GC in prokaryotes. Our results have been disputed by Marashi and Ghalanbor, who claim that the correlations we show are not "robust" because the elimination of some points (arbitrarily chosen) leads, in some families, to variations in the correlation coefficients and/or significance of correlations. Here, we test whether the correlation between T(opt) and genomic GC is robust by using two independent approaches: detection of possible outliers (using robust Mahalanobis distance) and usage of a non-parametric correlation coefficient that is not sensitive to the presence of outliers. The results presented here reinforce our previous proposal that T(opt) is correlated with genomic GC in prokaryotes.
authors.affiliation: Laboratorio de Organización y Evolución del Genoma, Facultad de Ciencias, Montevideo, Uruguay.
authors.forename: Hector
authors.initials: H
authors.lastname: Musto
authors.forename: Hugo
authors.initials: H
authors.lastname: Naya
authors.forename: Alejandro
authors.initials: A
authors.lastname: Zavala
authors.forename: Hector
authors.initials: H
authors.lastname: Romero
authors.forename: Fernando
authors.initials: F
authors.lastname: Alvarez-Valin
authors.forename: Giorgio
authors.initials: G
authors.lastname: Bernardi
mesh_terms: D003596:Cytosine / Q000737:chemistry*; D016678:Genome; D006147:Guanine / Q000737:chemistry*; D011387:Prokaryotic Cells / Q000166:cytology*; D013696:Temperature
chemical_list: D006147:Guanine; D003596:Cytosine