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Open Access 20-04-2024 | Preimplantation Genetic Diagnostics | Genetics

Aneuploidy detection in pooled polar bodies using rapid nanopore sequencing

Authors: Silvia Madritsch, Vivienne Arnold, Martha Haider, Julia Bosenge, Mateja Pfeifer, Beatrix Weil, Manuela Zechmeister, Markus Hengstschläger, Jürgen Neesen, Franco Laccone

Published in: Journal of Assisted Reproduction and Genetics

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Abstract

Purpose

Various screening techniques have been developed for preimplantation genetic testing for aneuploidy (PGT-A) to reduce implantation failure and miscarriages in women undergoing in vitro fertilisation (IVF) treatment. Among these methods, the Oxford nanopore technology (ONT) has already been tested in several tissues. However, no studies have applied ONT to polar bodies, a cellular material that is less restrictively regulated for PGT-A in some countries.

Methods

We performed rapid short nanopore sequencing on pooled first and second polar bodies of 102 oocytes from women undergoing IVF treatment to screen for aneuploidy. An automated analysis pipeline was developed with the expectation of three chromatids per chromosome. The results were compared to those obtained by array-based comparative genomic hybridisation (aCGH).

Results

ONT and aCGH were consistent for 96% (98/102) of sample ploidy classification. Of those samples, 36 were classified as euploid, while 62 were classified as aneuploid. The four discordant samples were assessed as euploid using aCGH but classified as aneuploid using ONT. The concordance of the ploidy classification (euploid, gain, or loss) per chromosome was 92.5% (2169 of 2346 of analysed chromosomes) using aCGH and ONT and increased to 97.7% (2113/2162) without the eight samples assessed as highly complex aneuploid using ONT.

Conclusion

The automated detection of the ploidy classification per chromosome and shorter duplications or deletions depending on the sequencing depth demonstrates an advantage of the ONT method over standard, commercial aCGH methods, which do not consider the presence of three chromatids in pooled polar bodies.
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Metadata
Title
Aneuploidy detection in pooled polar bodies using rapid nanopore sequencing
Authors
Silvia Madritsch
Vivienne Arnold
Martha Haider
Julia Bosenge
Mateja Pfeifer
Beatrix Weil
Manuela Zechmeister
Markus Hengstschläger
Jürgen Neesen
Franco Laccone
Publication date
20-04-2024
Publisher
Springer US
Published in
Journal of Assisted Reproduction and Genetics
Print ISSN: 1058-0468
Electronic ISSN: 1573-7330
DOI
https://doi.org/10.1007/s10815-024-03108-7