Abstract
The cytogenomics-based methodology of Directional Genomic Hybridization (dGH™) emerged from the concept of strand-specific hybridization, first made possible by Chromosome Orientation FISH (CO-FISH), the utility of which was demonstrated in a variety of early applications, often involving telomeres. Similar to standard whole chromosome painting (FISH), dGH™ is capable of identifying inter-chromosomal rearrangements (translocations between chromosomes), but its distinctive strength stems from its ability to detect intra-chromosomal rearrangements (inversions within chromosomes), and to do so at higher resolution than previously possible. dGH™ brings together the strand specificity and directionality of CO-FISH with sophisticated bioinformatics-based oligonucleotide probe design to unique sequences. dGH™ serves not only as a powerful discovery tool—capable of interrogating the entire genome at the megabase level—it can also be used for high-resolution targeted detection of known inversions, a valuable attribute in both research and clinical settings. Detection of chromosomal inversions, particularly small ones, poses a formidable challenge for more traditional cytogenetic approaches, especially when they occur near the ends or telomeric regions. Here, we describe Telo-dGH™, a strand-specific scheme that utilizes dGH™ in combination with telomere CO-FISH to differentiate between terminal exchange events, specifically terminal inversions, and an altogether different form of genetic recombination that often occurs near the telomere, namely sister chromatid exchange (SCE).
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McKenna, M.J., Robinson, E., Goodwin, E.H., Cornforth, M.N., Bailey, S.M. (2017). Telomeres and NextGen CO-FISH: Directional Genomic Hybridization (Telo-dGH™). In: Songyang, Z. (eds) Telomeres and Telomerase. Methods in Molecular Biology, vol 1587. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-6892-3_10
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DOI: https://doi.org/10.1007/978-1-4939-6892-3_10
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