By Monica Riley (auth.), Max K. Hecht, Bruce Wallace, Ghillean T. Prance (eds.)
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Extra resources for Evolutionary Biology: Volume 19
Sometimes an addition to the genome involves segments of DNA that Discontinuous Bacterial Genome Evolution 31 include intact foreign genes, such as the genes that are present in the remnants of cryptic prophage DNAs or genes that are transported as a part of movable genetic elements. Such genetic interactions create discontinuities in the DNA. When carrying out comparative analyses of genes or genomes that are evolutionarily related, it is clear that sequence homologies, nucleotide replacements, and amino acid replacements only tell part of the story.
BioI. 163:513-532. , and Cohen, G. , 1983, Nucleotide sequence of thrC and of the transcription termination region of the threonine operon in Escherichia coli KI2, Nucleic Acids Res. 21:7331-7345. , and Boyer, H. , 1983, Transposable elements of Halabacterium halabium, Mol. Gen. Genet. 191:182-188. Reeve, E. C. , and Braithwaite, J. , 1974, The lactose system in Klebsiella aeragenes V9A, 4. A comparison of the lac operons of Klebsiella and Escherichia coli, Genet. Res. 24:323-331. Reynolds, A. , 1981, Insertion of DNA activates the cryptic bgl operon in E.
Typhimurium gene maps elsewhere. The features of the architecture of the E. coli and S. typhimurium genomes between the gpt and proC genes are summarized in Fig. 11, showing the discontinuities schematically as loop structures. It seems likely that the kinds of relationships that have been found in the lac region of the genomes of E. coli 30 M. Riley and S. typhimurium will be found in other parts of their genomes where other mismatches in genetic distances exist. What may appear to be simple loops when viewed on the scale of the complete genome (Fig.
Evolutionary Biology: Volume 19 by Monica Riley (auth.), Max K. Hecht, Bruce Wallace, Ghillean T. Prance (eds.)