Development and validation of an accurate quantitative real-time polymerase chain reaction–based assay for human blastocyst comprehensive chromosomal aneuploidy screening

A 4-hour quantitative real-time polymerase chain reaction method for preimplantation comprehensive 24-chromosome aneuploidy screening was developed and validated. Results demonstrated 97.6% accuracy on cell lines and 98.6% consistency with microarray-based blastocyst diagnoses.


Nathan R. Treff, Ph.D., Xin Tao, M.Sc., Kathleen M. Ferry, B.Sc., Jing Su, M.Sc., Deanne Taylor, Ph.D., Richard T. Scott Jr., M.D., H.C.L.D.

Volume 97, Issue 4, Pages 819-824.e2



To develop and validate a quantitative real-time polymerase chain reaction (qPCR)–based method for blastocyst trophectoderm comprehensive chromosome screening (CCS) of aneuploidy.


Prospective, randomized, and blinded.


Academic center for reproductive medicine.


Nine cell lines were obtained from a commercial cell line repository, and 71 discarded human blastocysts were obtained from 24 IVF patients that underwent preimplantation genetic screening.



Main Outcome Measure(s):

Consistency of qPCR diagnosis of aneuploidy compared with either conventional karyotyping of cell lines or microarray-based diagnoses of human blastocysts.


Samples from nine cell lines with well characterized karyotypes were diagnosed by qPCR with 97.6% (41/42) consistency. After applying a minimum threshold for concurrence, 100% consistency was achieved. Developmentally normal blastocysts designated as aneuploid or arrested blastocysts designated as euploid by single-nucleotide polymorphism microarray analyses were assigned identical 24 chromosome diagnoses by qPCR in 98.6% of cases (70/71). Overall euploidy (n = 37) and aneuploidy (n = 34) were assigned with 100% consistency. Data was obtained for both sample types in 4 hours.


These data demonstrate the first qPCR technology capable of accurate aneuploidy screening of all 24 chromosomes in 4 hours. This methodology provides an opportunity to evaluate trophectoderm biopsies with subsequent fresh euploid blastocyst transfer. Randomized controlled trials to investigate the clinical efficacy of qPCR-based CCS are currently underway.

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