Biology 1001A Chapter Notes - Chapter Cycle 3: Transposable Element, Transposase, Inverted Repeat
11 Dec 2017
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Reading for lecture 7 october 3rd, 2017. 9. 4 - all organisms appear to contain particular segments of dna, called mobile elements, that can move from one place to another. 9. 4a mobile elements are known as transposable elements (tes). In mobile elements, transposition is the mechanism of movement involving nonhomologous recombination. This process starts with contact between the te and the target site; meaning the popular name jumping genes is inaccurate (they are never in the air) They produce mutations by transposing into genes and changing their function, and they increase/decrease gene expression. Insertion sequences (iss): simple, small and only contain genes for their transposition by using the gene transposase: at each of the two ends of an is is a short, inverted repeat sequence - the same. This enables the transposase enzyme to identify the ends of the te when it catalyzes transposition. Transposons: an enzyme responsible for recombination reactions that insert or remove.
