Scientists funded by the National Institutes of Health have developed a same-day test to identify abnormal fetal chromosomes.
The Short-read Transpore Rapid Karyotyping (STORK) test can detect extra or missing chromosomes (i.e., aneuploidy) using samples collected from prenatal tests, such as amniocentesis and chorionic villus sampling, as well as tissue obtained from miscarriage and biopsies from pre-implantation embryos produced using in vitro fertilization (IVF). The study is led by Brynn Levy, Ph.D., and Zev Williams, M.D., Ph.D., from Columbia University Fertility Center and Columbia University Irving Medical Center, New York City, and is supported by NIH’s Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD) through the Human Placenta Project.
The study team compared STORK to standard methods by testing 218 samples that included tissue from miscarriage, chorionic villi, amniotic fluid and trophectoderm biopsies, which are used to evaluate embryos before IVF implantation. In this set of samples, STORK had an accuracy of 98 to 100%. In another set of 60 samples, technicians in a clinical laboratory certified for quality testing, called a Clinical Laboratory Improvement Amendments certification, performed STORK. In these samples, STORK was 100% in accordance with standard clinical testing.
Overall, the study shows that STORK is comparable to standard clinical tests and has many advantages. STORK is faster, providing results within hours versus several days. It is also cheaper, with the study team estimating STORK to cost less than $50 per sample, if 10 samples are run at the same time, or up to $200 if a sample is run on its own. STORK can also be done at the point-of-care for a patient, eliminating the need to ship a sample to a clinical laboratory.
