PGT-A (Preimplantation Genetic Testing for Aneuploidy), formerly referred to as PGS (Preimplantation Genetic Screening) determines the chromosomal status of an embryo by screening all 23 chromosome pairs prior to transfer in an IVF cycle.
PGT-A may be appropriate for couples pursuing IVF due to a history of infertility or recurrent pregnancy loss because a major cause of IVF failure is aneuploidy — embryos with an abnormal number of chromosomes.1,2 Aneuploidy can occur in any embryo; however, the chances increase with maternal age.3, 4
Selectively transferring embryos most likely to have a normal number of chromosomes (euploid) is important in reducing miscarriage rates and improving IVF success rates.4,5,6,7 PGT-A has the following benefits:
PGT-A can be performed using next-generation sequencing (NGS) using the VeriSeq PGS Solution on the MiSeq Sequencing Instrument.
Using Illumina technology, the VeriSeq PGS solution can screen all 24 chromosomes in as little as 12 hours for an accurate, efficient view of the number of chromosomes in an embryo.
The VeriSeq PGS Kit - MiSeq uses NGS on the Illumina MiSeq System to screen all 24 chromosomes for aneuploidy in a single assay. The assay can be used on a single-cell (blastomere biopsy) or a few cells (blastocyst biopsy) from an embryo. The VeriSeq PGS workflow goes from sample to result in approximately 12 hours.
The VeriSeq PGS Kit is designed for multiplexing up to 24 samples per run on the MiSeq System. When 24 samples are not available for a run, it is possible to run the assay in a low-throughput, fast-run mode (8-12 samples/run).
*Data calculations on file. Illumina. Inc 2015
Many clinics have seen the benefit of making time-lapse a standard of care for their patients. The same is true for Preimplantation Genetic Testing (PGT). The fact that there are two such widely implemented techniques has created some questions about which new technology will offer the best treatment options for improving clinical outcome. In this webinar Dr. Tine Qvistgaard Kajhøj shows how time-lapse and PGT can be used together to offer the best overall possibility for improving outcomes and clinical workflow.Watch webinar
Learn more about how PGT-A may improve your chance of a successful pregnancyLearn more
1. Centers for Disease Control and Prevention.Org Website Accessed March 11, 2016.
2. Scott RT, Ferry K, Su J, Tao X, Scott K, Treff NR. Comprehensive chromosome screening is highly predictive of the reproductive potential of human embryos: a prospective, blinded, nonselection study. Fertil Steril. 2012;97(4):870-875.
3. Ata B, Kaplan B, Danzer H, et al. Array CGH analysis shows that aneuploidy is not related to the number of embryos generated. Reprod Biomed Online. 2012;24:614–620.
4. Harton GL, Munne S, Surrey M, et al. Diminished effect of maternal age on implantation after preimplantation genetic diagnosis with array comparative genomic hybridization. Fertil Steril. 2013;100(6):1695–1703
5. Yang Z, Liu J, Collins GS, Salem SA, Liu X, et al. (2012) Selection of single blastocysts for fresh transfer via standard morphology assessment alone and with array CGH for good prognosis patients: results from a randomised pilot study. Mol Cytogenet 5: 24
6 Forman EJ, Hong KH, Ferry KM, et al. In vitro fertilization with single euploid blastocyst transfer: a randomized controlled trial. Fertil Steril. 2013;100(1):100–107.
7. Grifo JA, Hodes-Wertz B, Lee HL, Amperloquio E, Clarke-Williams M, Adler A. Single thawed euploid embryo transfer improves IVF pregnancy, miscarriage, and multiple gestation outcomes and has similar implantation rates as egg donation. J Assist Reprod Genet. 2013;30(2):259–264