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Comparison of peach and Arabidopsis genomic sequences: fragmentary conservation of gene neighborhoods

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We examined the degree of conservation of gene order in two plant species, Prunus persica (peach) and Arabidopsis thaliana (thale cress), whose lineages diverged more than 90 million years ago. In the three peach genomic regions studied, segments with a gene order congruent with A. thaliana were short (two to three genes in length); and for any peach region, corresponding segments were found in diverse locations in the A. thaliana genome. At the gene level and lower, the A. thaliana sequence was enormously useful for identifying likely coding regions in peach sequences and in determining their intron–exon structure. The peach BAC sequence data reported here contained a BLAST-detectable putative coding sequence an average of every 7 kb, and the peach introns identified in this study were, on average, almost twice the length of the corresponding introns in A. thaliana.Key words: conserved microsynteny, genome evolution.

Les auteurs ont examiné la conservation de l'ordre des gènes chez deux espèces végétales, le Prunus persica (pêcher) et l'Arabidopsis thaliana (arabette des dames), dont les ancêtres auraient divergé il y a environ 90 millions d'années. Au sein des trois régions génomiques étudiées chez le pêcher, seuls de courts segments (deux à trois gènes) ont été observés chez lesquels l'ordre génique était identique à celui observé chez l'A. thaliana. De plus, pour chaque région du génome du pêcher, des segments correspondants étaient observés à divers endroits dans le génome de l'A. thaliana. Au niveau génique ou inférieur, la séquence de l'A. thaliana s'avérait très utile pour identifier de possibles régions codantes et la structure des exons–introns au sein des séquences du pêcher. Les séquences des clones BAC du pêcher rapportées ici recelait en moyenne une région codante potentielle (détectable par analyse BLAST) à tous les 7 kb et les introns du pêcher étaient deux fois plus grands en moyenne que ceux de l'A. thaliana.Mots clés : microsynténie conservée, évolution du génome.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2003-04-01

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  • From its inception in 1957, this international cytogenetics journal has catered to the research areas of the members of the Genetics Society of Canada; traditionally, these have included agriculture, entomology, genetics/cytogenetics, and evolutionary mechanisms. The contents of the journal have evolved as contributors developed new technologies and interests. A 20-member Editorial Board is composed of scientists from around the world. Reviews and commentary from respected experts are often featured.
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