PLoS ONE (Jan 2015)

A Euploid Line of Human Embryonic Stem Cells Derived from a 43,XX,dup(9q),+12,-14,-15,-18,-21 Embryo.

  • Simone Aparecida Siqueira Fonseca,
  • Roberta Montero Costas,
  • Mariana Morato-Marques,
  • Silvia Costa,
  • Jose Roberto Alegretti,
  • Carla Rosenberg,
  • Eduardo Leme Alves da Motta,
  • Paulo C Serafini,
  • Lygia V Pereira

DOI
https://doi.org/10.1371/journal.pone.0140999
Journal volume & issue
Vol. 10, no. 11
p. e0140999

Abstract

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Aneuploid embryos diagnosed by FISH-based preimplantation genetic screening (PGS) have been shown to yield euploid lines of human embryonic stem cells (hESCs) with a relatively high frequency. Given that the diagnostic procedure is usually based on the analysis of 1-2 blastomeres of 5 to 10-cell cleavage-stage embryos, mosaicism has been a likely explanation for the phenomena. However, FISH-based PGS can have a significant rate of misdiagnosis, and therefore some of those lines may have been derived from euploid embryos misdiagnosed as aneuploid. More recently, coupling of trophectoderm (TE) biopsy at the blastocyst stage and array-CGH lead to a more informative form of PGS. Here we describe the establishment of a new line of hESCs from an embryo with a 43,XX,dup(9q),+12,-14,-15,-18,-21 chromosomal content based on array-CGH of TE biopsy. We show that, despite the complex chromosomal abnormality, the corresponding hESC line BR-6 is euploid (46,XX). Single nucleotide polymorphism analysis showed that the embryo's missing chromosomes were not duplicated in BR-6, suggesting the existence of extensive mosaicism in the TE lineage.