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Direct measurement of the transfer rate of chloroplast DNA into the nucleus

Nature volume 422, pages 72–76 (2003)Cite this article

Abstract

Gene transfer from the chloroplast to the nucleus has occurred over evolutionary time1. Functional gene establishment in the nucleus is rare, but DNA transfer without functionality is presumably more frequent. Here, we measured directly the transfer rate of chloroplast DNA (cpDNA) into the nucleus of tobacco plants (Nicotiana tabacum). To visualize this process, a nucleus-specific neomycin phosphotransferase gene (neoSTLS2) was integrated into the chloroplast genome, and the transfer of cpDNA to the nucleus was detected by screening for kanamycin-resistant seedlings in progeny. A screen for kanamycin-resistant seedlings was conducted with about 250,000 progeny produced by fertilization of wild-type females with pollen from plants containing cp-neoSTLS2. Sixteen plants of independent origin were identified and their progenies showed stable inheritance of neoSTLS2, characteristic of nuclear genes. Thus, we provide a quantitative estimate of one transposition event in about 16,000 pollen grains for the frequency of transfer of cpDNA to the nucleus. In addition to its evident role in organellar evolution, transposition of cpDNA to the nucleus in tobacco occurs at a rate that must have significant consequences for existing nuclear genes.

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Figure 1: Introduction of aadA and neoSTLS2 genes into the tobacco plastid genome by homologous recombination.
Figure 2: Seedling tests for resistance to spectinomycin and kanamycin.
Figure 3: Analysis of kanamycin-resistant plants and three transplastomic/nuclear junctions.

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Acknowledgements

We thank the Australian Research Council for financial support; P. Maliga for pPRV111A; S. Whitney and J. Andrews for facilities and advice on chloroplast transformation, for SSuH2 seeds and for comments on the manuscript; T. J. Higgins, P. Whitfeld, W. Martin and R. Lockington for discussion; C. Maas for pCMneoSTLS2; N. Smith for the NS23 seeds; and S. Elts for technical assistance.

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Authors and Affiliations

  1. Department of Molecular Biosciences, The University of Adelaide, South Australia, 5005, Australia

    Chun Y. Huang & Jeremy N. Timmis

  2. CSIRO Plant Industry, GPO Box 1600, Australian Capital Territory, 2601, Australia

    Michael A. Ayliffe

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  1. Chun Y. Huang
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  2. Michael A. Ayliffe
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  3. Jeremy N. Timmis
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Correspondence to Jeremy N. Timmis.

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Huang, C., Ayliffe, M. & Timmis, J. Direct measurement of the transfer rate of chloroplast DNA into the nucleus. Nature 422, 72–76 (2003). https://doi.org/10.1038/nature01435

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