Two different microarray technologies for preimplantation genetic diagnosis and screening, due to reciprocal translocation imbalances, demonstrate equivalent euploidy and clinical pregnancy rates

• Published in: Journal of assisted reproduction and genetics 2014-07, Vol.31 (7), p.843-850
• Main Authors: Tobler, Kyle J., Brezina, Paul R., Benner, Andrew T., Du, Luke, Xu, Xin, Kearns, William G.
• Format: Article
• Language: English
• Subjects: Adult; Aneuploidy; Chromosome Segregation - genetics; Chromosomes; Comparative Genomic Hybridization; Embryos; Endocrinology; Female; Fertility; Fertilization in Vitro - methods; Genetic Testing; Genetics; Gynecology; Human Genetics; Humans; Hybridization; In vitro fertilization; Infertility; Male; Medicine; Medicine & Public Health; Microarray Analysis; Middle Aged; Obstetrics; Polymorphism; Polymorphism, Single Nucleotide; Pregnancy; Pregnancy Rate; Preimplantation Diagnosis; Reproductive Medicine; Translocation, Genetic
• ISSN: 1058-0468; 1573-7330
• DOI: 10.1007/s10815-014-0230-3

Purpose To compare single nucleotide polymorphism (SNP) and comparative genomic hybridization (aCGH) microarray platforms to evaluate embryos for parental translocation imbalances and aneuploidy. Methods A retrospective review of preimplantation genetic diagnosis and screening (PGD/PGS) results of 498 embryos from 63 couples undergoing 75 in vitro fertilization cycles due to parental carriers of a reciprocal translocation. Results There was no significant difference between SNP and aCGH microarrays when comparing the prevalence of embryos that were euploid with no translocation imbalance, euploidy with a parental translocation imbalance or aneuploid with or without the parental chromosome imbalance. The clinical pregnancy rates were also equivalent for SNP (60 %) versus aCGH (65 %) microarrays. Of 498 diagnosed embryos, 45 % (226/498) were chromosomally normal without translocation errors or aneuploidy, 22 % (112/498) were euploid but had a parentally derived unbalanced chromosomal segregant, 8 % (42/498) harbored both a translocation imbalance and aneuploidy and 24 % (118/498) of embryos were genetically balanced for the parental reciprocal translocation but were aneuploid for other chromosomes. The overall clinical pregnancy rate per IVF cycle following SNP or aCGH microarray analysis was 61 % and was higher if the biopsy was done on blastocysts (65 %) versus cleavage stage embryos (59 %), although not statistically significant. Conclusions SNP or aCGH microarray technologies demonstrate equivalent clinical findings that maximize the pregnancy potential in patients with known parental reciprocal chromosomal translocations.