Abstract
Fluorescence in situ hybridization (FISH) is an effective and accurate cytogenetic tool for mapping single copy and repetitive DNA sequences on chromosomes. Attempts to increase the detection sensitivity of very small chromosomal targets, and to improve the spatial resolution of signals derived from flanking sequences, have led to the development of a variety of novel techniques: it is now possible to perform in situ hybridizations on interphase nuclei, meiotic pachytene chromosomes and isolated chromatin (DNA fibres). The recent application of these techniques has indicated that a spatial resolution of 1 kb between adjacent targets and a sensitivity of targets smaller than 1 kb is now feasible. Here, we describe the benefits of these novel chromosome analysis techniques and discuss their relevance for the study of plant genomes.
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