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J. Bacteriol., Nov 1995, 6585-6592, Vol 177, No. 22
Copyright © 1995, American Society for Microbiology

The chromosome of Salmonella paratyphi A is inverted by recombination between rrnH and rrnG

SL Liu and KE Sanderson
Department of Biological Sciences, University of Calgary, Alberta, Canada.

Salmonella paratyphi A, a human-adapted bacterial pathogen, causes paratyphoid enteric fever. We established the genome map of strain ATCC 9150 by the use of four endonucleases, XbaI, I-CeuI, AvrII (= BlnI), and SpeI, which generated 27, 7, 19, and 38 fragments, respectively; the sum of the fragments in each case indicates a genome size of ca. 4,600 kb. With phage P22, we transduced Tn10 insertions in known genes from Salmonella typhimurium LT2 to S. paratyphi A ATCC 9150 and located these insertions on the S. paratyphi A chromosome through the XbaI and AvrII sites in Tn10 and through the increased size of the SpeI fragment bearing a Tn10. Compared with the maps of other Salmonella species, the S. paratyphi A genomic map showed two major differences: (i) an insertion of about 100 kb of DNA between rrnH/G and proB and (ii) an inversion of half the genome between rrnH and rrnG, postulated to be due to homologous recombination between the rrn genes. We propose that during the evolution of S. paratyphi A, the first rearrangement event was the 100-kb insertion, which disrupted the chromosomal balance between oriC and the termination of replication, forcing the rrnH/G inversion to restore the balance. The insertion and the inversion are both present in all 10 independent wild-type S. paratyphi A strains tested.


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