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Genetics, Vol. 154, 1819-1825, April 2000, Copyright © 2000

Two Classes of Genes in Plants

Nicolas Carelsa,b and Giorgio Bernardia,b
a Laboratoire de Génétique Moléculaire, Institut Jacques Monod, F-75005 Paris, France
b Laboratorio di Evoluzione Molecolare, Stazione Zoologica Anton Dohrn, I-80121 Napoli, Italy

Corresponding author: Giorgio Bernardi, Laboratorio di Evoluzione Molecolare, Stazione Zoologica Anton Dohrn, Villa Comunale, I-80121 Napoli, Italy., bernardi{at}alpha.szn.it (E-mail)

Communicating editor: S. YOKOYAMA

Two classes of genes were identified in three Gramineae (maize, rice, barley) and six dicots (Arabidopsis, soybean, pea, tobacco, tomato, potato). One class, the GC-rich class, contained genes with no, or few, short introns. In contrast, the GC-poor class contained genes with numerous, long introns. The similarity of the properties of each class, as present in the genomes of maize and Arabidopsis, is particularly remarkable in view of the fact that these plants exhibit large differences in genome size, average intron size, and DNA base composition. The functional relevance of the two classes of genes is stressed by (1) the conservation in homologous genes from maize and Arabidopsis not only of the number of introns and of their positions, but also of the relative size of concatenated introns; and (2) the existence of two similar classes of genes in vertebrates; interestingly, the differences in intron sizes and numbers in genes from the GC-poor and GC-rich classes are much more striking in plants than in vertebrates.




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