Increased efficiency of preimplantation genetic diagnosis for aneuploidy by testing 12 chromosomes

Preimplantation genetic diagnosis of numerical abnormalities for 13 chromosomes.

Several types of FISH protocols for PGD have been used to maximize results from a limited number of fluorochomes to study as many chromosomes as possible. The major purpose of the present study was to optimize the use of three sequential hybridizations to analyse up to 15 chromosome types in single cells. A secondary purpose was to study the frequency of aneuploidy of other chromosomes not yet ...

Improved implantation after preimplantation genetic diagnosis of aneuploidy.

The objective of this study was to assess the improvement in implantation rates after preimplantation genetic diagnosis (PGD) of numerical abnormalities for the sole indication of advanced maternal age when compared with a control group. Each PGD patient was matched to a control patient according to several parameters prior to obtaining pregnancy results. The diagnosis was based on the analysis...

First clinical application of comparative genomic hybridization and polar body testing for preimplantation genetic diagnosis of aneuploidy.

OBJECTIVE To develop a preimplantation genetic diagnosis (PGD) protocol that allows any form of chromosome imbalance to be detected. DESIGN Case report employing a method based on whole-genome amplification and comparative genomic hybridization (CGH). SETTING Clinical IVF laboratory. PATIENT(S) A 40-year-old IVF patient. INTERVENTION(S) Polar body and blastomere biopsy. MAIN OUTCOME M...

What next for preimplantation genetic screening (PGS)? Experience with blastocyst biopsy and testing for aneuploidy.

Blastocysts more commonly have a normal karyotype than cleavage-stage embryos do. Moreover, blastocysts have also made a metabolic transition from catabolism and recycling of the oocyte's reserves and resources, processes that fuel the first 3 days of cleavage. Although not all blastocysts are karyotypically equal, it is still to be determined to what extent a mosaic karyotype might be a normal...

Meiotic Behaviour of Chromosomes Involved in Structural Chromosomal Abnormalities Determined by Preimplantation Genetic Diagnosis