The evolution of DNA sequences in Escherichia coli.
Philos Trans R Soc Lond B Biol Sci
; 312(1154): 191-204, 1986 Jan 29.
Article
in En
| MEDLINE
| ID: mdl-2870515
ABSTRACT
It is proposed that certain families of transposable elements originally evolved in plasmids and functioned in forming replicon fusions to aid in the horizontal transmission of non-conjugational plasmids. This hypothesis is supported by the finding that the transposable elements Tn3 and gamma delta are found almost exclusively in plasmids, and also by the distribution of the unrelated insertion sequences IS4 and IS5 among a reference collection of 67 natural isolates of Escherichia coli. Each insertion sequence was found to be present in only about one-third of the strains. Among the ten strains found to contain both insertion sequences, the number of copies of the elements was negatively correlated. With respect to IS5, approximately half of the strains containing a chromosomal copy of the insertion element also contained copies within the plasmid complement of the strain.
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Collection:
01-internacional
Health context:
3_ND
Database:
MEDLINE
Main subject:
DNA, Bacterial
/
Escherichia coli
/
Biological Evolution
Type of study:
Prognostic_studies
Language:
En
Journal:
Philos Trans R Soc Lond B Biol Sci
Year:
1986
Document type:
Article