Abstract
Chromosome Orientation FISH (CO-FISH) is a technique that can be used to extend the information obtainable from standard FISH to include the relative orientation of two or more DNA sequences within a chromosome. CO-FISH can determine the absolute 5′-to-3′ direction of a DNA sequence relative to the short arm-to-long arm axis of the chromosome, and so was originally termed “COD-FISH” (Chromosome Orientation and Direction FISH). CO-FISH has been employed to detect chromosomal inversions associated with isochromosome formation, various pericentric inversions, and to confirm the origin of lateral asymmetry. More recent and sophisticated applications of CO-FISH include distinction between telomeres produced via leading- vs. lagging-strand DNA synthesis, identification of interstitial blocks of telomere sequence that result from inappropriate fusion to double-strand breaks (telomere-DSB fusion), discovery of elevated rates of mitotic recombination at chromosomal termini and sister chromatid exchange within telomeric DNA (T-SCE), establishing replication timing of mammalian telomeres throughout S-phase (ReD-FISH) and to identify chromosomes, in combination with spectral karyotyping (SKY-CO-FISH).
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References
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Bailey, S.M., Williams, E.S., Cornforth, M.N., Goodwin, E.H. (2010). Chromosome Orientation Fluorescence In Situ Hybridization or Strand-Specific FISH. In: Bridger, J., Volpi, E. (eds) Fluorescence in situ Hybridization (FISH). Methods in Molecular Biology, vol 659. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-789-1_12
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DOI: https://doi.org/10.1007/978-1-60761-789-1_12
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