Chromosome replication patterns in the hyperthermophilic euryarchaea Archaeoglobus fulgidus and Methanocaldococcus (Methanococcus) jannaschii.
We analysed chromosome replication patterns in the two hyperthermophilic euryarchaea Archaeoglobus fulgidus and Methanocaldococcus(Methanococcus) jannaschii by marker frequency analysis (MFA). For A. fulgidus, the central region of the chromosomal physical map displayed a higher relative abundance in gene dosage during exponential growth, with two continuous gradients to a region of lower abundance at the diametrically opposite side of the genome map. This suggests bidirectional replication of the A. fulgidus chromosome from a single origin. The organization of the putative replication origin region relative to the cdc6, mcm and DNA polymerase genes differed from that reported for Pyrococcus species. No single replication origin or termination regions could be identified for M. jannaschii, adding to the list of unusual properties of this organism. The organization of the A. fulgidus cell cycle was characterized by flow cytometry analysis of the samples from which genomic DNA was extracted for MFA. The relative lengths of the cell cycle periods were found to be similar to those of crenarchaea.
Department of Bacteriology, Swedish Institute for Infectious Disease Control, SE-171 82 Solna, Sweden. Sophie.Maisnier@smi.ki.se
Sophie
S
Maisnier-Patin
Laurence
L
Malandrin
Nils-Kåre
NK
Birkeland
Rolf
R
Bernander
D019611:Archaeoglobus fulgidus / Q000166:cytology / Q000235:genetics* / Q000254:growth & development; D001483:Base Sequence; D002453:Cell Cycle; D019847:Chromosomes, Archaeal / Q000235:genetics*; D019641:DNA, Archaeal / Q000235:genetics; D005819:Genetic Markers; D020745:Genome, Archaeal; D017017:Methanococcus / Q000166:cytology / Q000235:genetics* / Q000254:growth & development; D020161:Physical Chromosome Mapping; D018741:Replication Origin
D019641:DNA, Archaeal; D005819:Genetic Markers