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  • Title: Accumulation of chloroplast DNA sequences on the Y chromosome of Silene latifolia.
    Author: Kejnovsky E, Kubat Z, Hobza R, Lengerova M, Sato S, Tabata S, Fukui K, Matsunaga S, Vyskot B.
    Journal: Genetica; 2006; 128(1-3):167-75. PubMed ID: 17028949.
    Abstract:
    Silene latifolia is a model dioecious plant with heteromorphic sex chromosomes. The Y chromosome is the largest in this species. Theoretical models propose an accumulation of repetitive DNA sequences in non-recombining parts of the Y chromosome. In this study, we isolated a BAC7H5 clone preferentially hybridizing to the Y chromosome of S. latifolia. Sequence analysis revealed that this BAC7H5 contains part of the chloroplast genome, indicating that these chloroplast sequences have accumulated on the Y chromosome and also may contribute to its large size. We constructed Y chromosome- and X chromosome-specific libraries and screened them to find Y- and/or X-linked copies of chloroplast sequences. Sequence analysis revealed higher divergence of a non-genic region of the chloroplast sequences located on the Y chromosome while genic regions tested showed only very low (max 0.9%) divergence from their chloroplast homologues.
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