Insertion sequences

Insertion sequences are simple procaryotic mobile elements .
Facts
In E. coli, spontaneous mutations in gal and in lac genes occur at 10-5 to 10-7 per generation. The mutations are highly polar. The polarity depends on r -factor .
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Insertion sequences are short (600-1500 base pairs long) simple transposons that do not carry genes beyond those essential for insertion of the transposon into E. coli. Complex transposons are much larger and carry additional genes.
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A general term for any genetic unit that can insert into a chromosome, exit, and relocate; includes insertion sequences, transposons, some bacteriophages, and controlling element.
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Insertion sequence (IS)
A transposable nucleotide sequence that only encodes the functions required for its own transposition. Insertion sequences are typically less than 5 kb. Synonymous with "insertion element".
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elements which are capable of moving from one site to another in a DNA molecule without any requirement for sequence relatedness at the donor and acceptor sites. Many transposons carry antibiotic resistance determinants and have insertion sequences ...
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Transposons in bacteria are also called insertion sequences. They usually carry an additional gene for a function other than transposase, often an antibiotic resistance.
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Shewanella oneidensis is unusual for a gamma proteobacterium, containing a very high number of multi-heme cytochrome c genes, and having the diversity of electron transport capacities it possesses. Insertion sequences compose 5.
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