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Annals of Botany 89: 3-10, 2002
© 2002 Annals of Botany Company

Comparative Genomics in the Grass Family: Molecular Characterization of Grass Genome Structure and Evolution

CATHERINE FEUILLET*,1 and BEAT KELLER

1Institute of Plant Biology, University of Zürich, Zollikerstrasse 107, CH-8008 Zürich, Switzerland

* For correspondence: Fax 00 4116348201, e-mail feuillet{at}botinst.unizh.ch

Received: 3 July 2001; Returned for revision: 4 September 2001; Accepted: 20 September 2001.

The genomes of grasses are very different in terms of size, ploidy level and chromosome number. Despite these significant differences, it was found by comparative mapping that the linear order (colinearity) of genetic markers and genes is very well conserved between different grass genomes. The potential of such conservation has been exploited in several directions, e.g. in defining rice as a model genome for grasses and in designing better strategies for positional cloning in large genomes. Recently, the development of large insert libraries in species such as maize, rice, barley and diploid wheat has allowed the study of large stretches of DNA sequence and has provided insight into gene organization in grasses. It was found that genes are not distributed randomly along the chromosomes and that there are clusters of high gene density in species with large genomes. Comparative analysis performed at the DNA sequence level has demonstrated that colinearity between the grass genomes is retained at the molecular level (microcolinearity) in most cases. However, detailed analysis has also revealed a number of exceptions to microcolinearity, which have given insight into mechanisms that are involved in grass-genome evolution. In some cases, the use of rice as a model to support gene isolation from other grass genomes will be complicated by local rearrangements. In this Botanical Briefing, we present recent progress and future prospects of comparative genomics in grasses.

Key words: Review, colinearity, gene density, genome evolution, genome structure, grasses (Poaceae), microcolinearity.


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