Abstract
We developed a method of enrichment for DNA replicated at the onset of S-phase in synchronized human HL60 cells. About 200 such sequences were cloned. The analysis of this selected DNA sample showed that: 1) the cloned DNA fragments derive from a limited number (750-1500) of replicons; 2) there is no extensive homology between different DNA fragments; 3) they are not significantly enriched in highly repeated sequences; 4) they are enriched in snap-back (Cot = o) DNA. The sequence of the longest fragment revealed the presence of numerous signals collected in a few hundred nucleotides: 1) homology with the origin of replication of human Papovaviruses usually associated with potential stem-loop structures; 2) binding sites for known transcription factors and for another nuclear factor; 3) potential binding sites for the chromosome "scaffold".
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