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Genome evolution

Arabidopsis 4, Tomato 1

Nature Reviews Genetics volume 1, pages 4–5 (2000)Cite this article

Ku and colleagues sequenced a 105-kilobase bacterial artificial chromosome (BAC) from tomato chromosome 2. Of the 17 predicted ORFs found in the BAC, 12 cross-matched repeatedly not to one, but to four separate Arabidopsis regions (on chromosomes 2, 3, 4 and 5). The individual Arabidopsis segments contain incomplete but overlapping subsets of the 12 ORFs found on the tomato BAC; furthermore, the ORFs are arranged in the same relative order in all segments (including the BAC). The simplest explanation for this finding is first, that there have been two rounds of large-scale duplications (perhaps even polyploidy) in the Arabidopsis lineage since it diverged from tomato and second, that all segments have derived from an ancestral, tomato-like template that predates the divergence of tomato and Arabidopsis .

The preserved gene order also tells us that chromosomal rearrangements (for example, inversions, translocations and transpositions) had a relatively minor role in shaping the evolution of the plant genome, which is conducted instead by repeated rounds of genome duplication followed by progressive gene loss.

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References

ORIGINAL RESEARCH PAPER

  1. Ku, H.-M., Vision, T., Liu, J. & Tanksley, S. D. Comparing sequenced segments of the tomato and Arabidopsis genomes: large-scale duplication followed by selective gene loss creates a network of synteny. Proc. Natl Acad. Sci. USA 97, 9121–9126 (2000).

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  2. Grant, D., Cregan, P. & Shoemaker, R. C. Genome organization in dicots: genome duplication in Arabidopsis and synteny between soybean and Arabidopsis. Proc. Natl Acad. Sci. USA 97, 4168– 4173 (2000).

    Article  CAS  Google Scholar 

FURTHER READING

  1. Blanc, G., Barakat, A., Guyot, R., Cooke, R. & Delseny M. Extensive duplication and reshuffling in the Arabidopsis genome. Plant Cell 12, 1093–1102 (2000).

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Authors
  1. Tanita Casci
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Steven Tanksley's homepage

Randy Shoemaker's lab page

The Arabidopsis Genome Initiative

The Tomato Genomics Project (funded by the NSF) at Cornell University

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Casci, T. Arabidopsis 4, Tomato 1. Nat Rev Genet 1, 4–5 (2000). https://doi.org/10.1038/35049507

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