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První zkušenosti s preimplantačním genetickým screeningem chromozomových abnormalit pomocí komparativní genomové hybridizace na oligonukleotidových DNA mikročipech

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Title in English First experiences with preimplantation genetic screening of chromosomal aberrations using oligonucleotide-based array comparative genomic hybridization


Year of publication 2015
Type Article in Periodical
Magazine / Source Časopis lékařů českých
MU Faculty or unit

Faculty of Science

Field Genetics and molecular biology
Keywords chromosomal aberrations; preimplantation genetic analysis; array-CGH
Description Preimplantation genetic diagnosis (PGD) is a complex approach for detecting genetic abnormalities in early-stage embryos using genetic or molecular cytogenetic methods. Recently, single cell genomic methods based on DNA microarrays have been used for PGD. In the presented paper, we discuss and demonstrate the possibility to detect copy number variation (CNVs) in trophectoderm cells biopsied from 5-day embryos using 60-mer oligonucleotide-based array-CGH with CytoSure 8 × 15K Aneuploidy Array. Whereas this microarray platform was originally designed for analysis of unamplified DNA derived from many cells, the new methods, developed for single-cell genomics, allow the application of oligo arrays technology in preimplanation genetic diagnosis. Preclinical validation of single cell array-CGH was made by analysis of 30 positive and negative controls. Validation process included whole genome amplification of DNA from 5–10 cells with normal karyotype and from samples with known aneuploidies and structural aberrations. Subsequently, we analyzed the whole genome profiles in 118 embryos; aneuploidies of chromosomes were observed in 26.7%; segmental imbalances were proved in 6.8% of embryos. Our first experience confirmed that this oligonucleotide-based array technique enables high-resolution preimplantation aneuploidy screening of all the 23 chromosome pairs and sensitive preimplantation diagnosis of segmental imbalances such as deletions, duplications and amplifications.
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