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Sara Carioscia: Study Finds Fewer Than 1% of Human Blastocysts Are Fully Euploid

Sara Carioscia/LinkedIn

Oct 18, 2025, 09:04

Sara Carioscia: Study Finds Fewer Than 1% of Human Blastocysts Are Fully Euploid

Sara Carioscia, Graduate Researcher, Computational Biology and Genomics at The Johns Hopkins University, shared a post on LinkedIn:

“Thrilled to share our new publication in Genetics!

Overall, we find that fewer than 1% of human blastocysts are likely fully euploid (chromosomally normal). This suggests that low-level mosaicism (a mix of normal and abnormal cells) is a normal, widespread feature of early embryonic development.

This paper is particularly exciting to me as it directly addresses a question that arose from my other PhD work, using data from IVF blastocyst biopsies. This research used computational modeling and approximate Bayesian computation (ABC) to overcome the limitations of small embryo biopsies, allowing us to infer the underlying rates of chromosomal errors (aneuploidies) during human preimplantation development.

Even more meaningful were the students (co-authors!) who I got to mentor on this project – Matthew Isada, who joined our lab as a PhD rotation student and demonstrated that this work is tractable and worth pursing; and Angela Yang, who joined the lab as an undergraduate(!) and built the computational infrastructure for these thousands of simulations. And thank you as always to my PhD advisor Rajiv McCoy for all the support and mentorship!”

Title: Approximate Bayesian computation supports a high incidence of chromosomal mosaicism in blastocyst-stage human embryos

Authors: Qingya Yang, Sara A Carioscia, Matthew Isada, Rajiv C McCoy

Sara Carioscia: Study Finds Fewer Than 1% of Human Blastocysts Are Fully Euploid