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Cytosine methylation changes (hyper- or hypomethylation) in centromeric and telomeric sequences were observed in all three studied rice introgression lines containing DNA from wild rice, Zizania latifolia Griseb. The changed genomic Southern hybridization patterns were complex and non-concordant between a pair of isoschizomers (HpaII/MspI) digests, indicating methylation modifications at both the inner and outer cytosines of the CCGG sites. The changed patterns were inherited through generations. Possible mechanism for the methylation changes and their potential implications for the phenotypic variation and genome organization are discussed.
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Liu et al. (2001) studied this question.
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