Abstract
We describe a 258-bp densely methylated DNA island (DMI) and chromosomal origin of bidirectional DNA replication within the transcribed portion of the human RPS14 intron 1. Together with the DMIs previously detected in two functional Chinese hamster replication origins [see Ref. 1, pp. 5636-5644], observations described in this report strengthen the correlation between densely methylated DNA islands and active mammalian chromosomal replication origins. Accordingly, DMIs may prove to be reliable physical markers for origins of bidirectional DNA replication in complex genomic DNAs of higher animals.
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