title: Proximity of an ARS consensus sequence to a replication origin of pea (Pisum sativum).
abstract: The replication origin (ori-r9) of the 9.0 kb rDNA repeats of pea (Pisum sativum, cv. Alaska) was cloned and found to reside in a 1.5 kb fragment of the non-transcribed spacer region located between the 25 S and 18 S genes. Labeled rDNA rich in replication forks, from cells positioned at the G1/S phase boundary, was used to map ori-r9 by hybridization procedures. Ori-r9 is in a 210-base fragment that is 1.6 kb from the 5' end of the 18 S gene and about 1.5 kb from the 3' end of the 25 S gene. The same procedures, using labeled synthetic ARS consensus sequence as a probe, showed than an ARS consensus sequence is located 3' to ori-r9 in a 710-base fragment. An ARS consensus sequence is, therefore, adjacent to ori-r9 but not coincidental with it.
authors.affiliation: Centro de Investigaciones Biológicas, C.S.I.C., Madrid, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Hernández
authors.forename: C A
authors.initials: CA
authors.lastname: Bjerknes
authors.forename: S S
authors.initials: SS
authors.lastname: Lamm
authors.forename: J
authors.initials: J
authors.lastname: Van't Hof