title: Conservation of IS6110 sequence in strains of Mycobacterium tuberculosis with single and multiple copies.
abstract: The insertion sequence IS6110/IS986 is used extensively for detecting and typing Mycobacterium tuberculosis. In order to appreciate the evolutionary and epidemiological significance of differences in the fingerprint pattern, it is necessary to understand the factors influencing transposition frequency. Although most strains have many copies of this element, some have only one or two copies; it has been suggested that this apparent transpositional defect arises from the minor differences in the sequence of the element from different strains. In contrast, we have found that the sequence is identical in high and low copy number strains, indicating that external factors, such as the presence of adjacent promoters, must be responsible for differences in copy number.
authors: Molecular Microbiology Group, School of Biological Sciences, University of Surrey, Guildford, UK. j.dale@surrey.ac.uk
authors: J W
authors: JW
authors: Dale
authors: T H
authors: TH
authors: Tang
authors: S
authors: S
authors: Wall
authors: Z F
authors: ZF
authors: Zainuddin
authors: B
authors: B
authors: Plikaytis
mesh_terms: D001483:Base Sequence; D017124:Conserved Sequence; D004251:DNA Transposable Elements / Q000235:genetics*; D004269:DNA, Bacterial / Q000235:genetics*; D006801:Humans; D009169:Mycobacterium tuberculosis / Q000235:genetics*; D016133:Polymerase Chain Reaction
chemical_list: D004251:DNA Transposable Elements; D004269:DNA, Bacterial