Journal
SCIENCE
Volume 287, Issue 5460, Pages 2023-2026Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.287.5460.2023
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The initiation sites of bidirectional synthesis at the DNA replication origin located at the 3' end of the human lamin B2 gene were investigated. RNA-primed nascent DNA molecules were subjected to second-strand synthesis with appropriate primers, amplified by ligation-mediated polymerase chain reaction, and size fractionated. Evidence for precise start sites was obtained. Exploration of close to 1 kilobase, coupled to inhibition of Okazaki fragment synthesis, demonstrates that the leading strands initiate at precise nucleotides on either helix, overlapping by three base pairs, within the area bound to a protein complex possibly analogous to the prereplicative complex of yeast.
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