Sequence similarities among monkey ori-enriched (ors) fragments.

Nucleotide sequences have been determined for eight ors (ori-enriched sequence) fragments isolated from monkey DNA by a method that was designed to enrich for origins of DNA replication [Kaufmann et al., Mol. Cell. Biol. 5 (1985) 721-727]. Evidence has been presented that some or possibly all of these sequences can serve, albeit inefficiently, as oris in vivo [Frappier and Zannis-Hadjopoulos, Proc. Natl. Acad. Sci. USA 84 (1987) 6668-6672]. Two of the fragments were found to contain the long terminal repeat-like elements of the 'O-family' of moderately repetitive sequences that are present in human DNA as a transposon-like element [Paulson et al., Nature 315 (1985) 359-361]. Extensive pair-wise comparisons of the sequences failed to detect any statistically significant common sequences, except for long asymmetrically distributed A + T-rich stretches. Nonetheless, when the ors fragments were examined for the presence of published consensus sequences, seven of eight were found to contain the control sequence described by Dierks et al. [Cell 32 (1983) 695-706], and the same seven of eight were found to contain both the scaffold attachment region T consensus [Gasser and Laemmli, Cell 46 (1986) 521-530] and the minimal Saccharomyces cerevisiae autonomously replicating sequence consensus [e.g., Palzkill and Newlon, Cell 53 (1988) 441-450].