Compositional Properties of Homologous Coding Sequences from Plants |
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Authors: | Nicolas Carels Pascal Hatey Kamel Jabbari Giorgio Bernardi |
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Affiliation: | (1) Laboratoire de Génétique Moléculaire, Institut Jacques Monod, 2 Place Jussieu, 75005 Paris, France, FR |
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Abstract: | In this work, we investigated (1) the compositional distributions of all available nuclear coding sequences (and of their three codon positions) of six dicots and four Gramineae; this considerably expanded our knowledge about the differences previously seen between these two groups of plants; (2) the compositional correlations of homologous genes from dicots and from Gramineae, as well as from both groups; all correlations were characterized by very good coefficients, with slopes close to unity in the former two cases and very high in the last; (3) the compositional transition that accompanied the emergence of Gramineae from an ancestral monocot; (4) the compositional correlations between exons and introns, which were very good in Gramineae, but only poor to good in dicots; and (5) the compositional profiles of homologous genes from angiosperms, which were characterized by a series of peaks (exons) and valleys (introns) separated by 15–20% GC. The conservative and transitional modes of compositional evolution in plant genes and their general implications are discussed. Received: 24 June 1997 / Accepted: 20 August 1997 |
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Keywords: | : Genes — Genomes — Angiosperms |
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