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Genome Rearrangements in Mammalian Evolution: Lessons From Human and Mouse Genomes

Department of Computer Science and Engineering, University of California, San Diego, La Jolla, CA 92093-0114, USA

Although analysis of genome rearrangements was pioneered by Dobzhansky and Sturtevant 65 years ago, we still know very little about the rearrangement events that produced the existing varieties of genomic architectures. The genomic sequences of human and mouse provide evidence for a larger number of rearrangements than previously thought and shed some light on previously unknown features of mammalian evolution. In particular, they reveal that a large number of microrearrangements is required to explain the differences in draft human and mouse sequences. Here we describe a new algorithm for constructing synteny blocks, study arrangements of synteny blocks in human and mouse, derive a most parsimonious human–mouse rearrangement scenario, and provide evidence that intrachromosomal rearrangements are more frequent than interchromosomal rearrangements. Our analysis is based on the human–mouse breakpoint graph, which reveals related breakpoints and allows one to find a most parsimonious scenario. Because these graphs provide important insights into rearrangement scenarios, we introduce a new visualization tool that allows one to view breakpoint graphs superimposed with genomic dot-plots.

[Supplemental material is available online at www.genome.org.]

E-MAIL ppevzner{at}cs.ucsd.edu

Article and publication are at http://www.genome.org/cgi/doi/10.1101/gr.757503. Article published online before print in December 2002.

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