Fiber-fluorescence in situ hybridization analyses as a diagnostic application for orientation of microduplications |
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Authors: | Toshiyuki Yamamoto Shino Shimada Keiko Shimojima |
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Institution: | Toshiyuki Yamamoto, Shino Shimada, Keiko Shimojima, Tokyo Women’s Medical University Institute for Integrated Medical Sciences, Tokyo 162-8666, Japan |
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Abstract: | Microduplications are normally invisible under microscopy and were not recognized before chromosomal microarray testing was available. Although it is difficult to confirm the orientation of duplicated segments by standard fluorescence in situ hybridization (FISH), our data indicates that fiber-FISH analysis has the potential to reveal the orientation of duplicated and triplicated segments of chromosomes. Recurrent microduplications reciprocal to microdeletions show tandem orientations of the duplicated segments, which is consistent with a non-allelic homologous recombination mechanism. Several random duplications showed tandem configurations and inverted duplications are rare. Further analysis is required to fully elucidate the basic mechanisms underlying such duplications/triplications. |
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Keywords: | Chromosomal microarray testing Copy number variation Fiber-fluorescence in situ hybridization Microduplication Tandem orientation |
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