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Background  To develop a novel preimplantation genetic screening (PGS) test using next generation sequencing(NGS) as a alternative to current array comparative genomic hybridization (array CGH) method for detection of small segmental translocations in two patients with repeated implantation failure (RIF) and recurrent miscarriage (RM). Inconsistent results were resolved by validation with fluorescence in situ hybridization (FISH).    Case Presentation  One couple with normal cytogenetic and array CGH result suffered from implantation failure. Later NGS analysis showed 46,XY.ngs[GRCh37/hg19] 9p24.3-9p24.1(10,291-8,680,890×1),13q33.1-13q34(103,046,327-114,785,444×3). The other couple with normal cytogenetic and array CGH result also received NGS analysis. Due to the detected abnormal finding, which was 46,XY.ngs 4q34.3-4q35.2(179,673,982-191,016,503×3),6p25.3-6p22.3 (146,672-17,829,693×1), the couple decided against the corresponding embryo transfer.    Conclusions  The NGS approach is a reliable alternative to array CGH for the discovery of small segmental translocations in patients with RIF and RM.

molecular cytogenetics

Identification of small segmental translocations in patients with repeated implantation failure and recurrent miscarriage using next generation sequencing after in vitro fertilization/intracytoplasmic sperm injection