Impact of male age on paternal aneuploidy: single-nucleotide polymorphism microarray outcomes following blastocyst biopsy

Tanya Samarasekera; Elissa Willats; Mark P Green; Tristan Hardy; Luk Rombauts; Deirdre Zander-Fox

doi:10.1016/j.rbmo.2023.06.002

Impact of male age on paternal aneuploidy: single-nucleotide polymorphism microarray outcomes following blastocyst biopsy

Reprod Biomed Online. 2023 Oct;47(4):103245. doi: 10.1016/j.rbmo.2023.06.002. Epub 2023 Jun 10.

Authors

Tanya Samarasekera¹, Elissa Willats², Mark P Green³, Tristan Hardy², Luk Rombauts⁴, Deirdre Zander-Fox⁵

Affiliations

¹ Monash IVF, Melbourne, Australia.. Electronic address: Tanya.Samarasekera@monashivf.com.
² Monash IVF, Melbourne, Australia.
³ Monash IVF, Melbourne, Australia.; School of Biosciences, Faculty of Science, University of Melbourne, Melbourne, Australia.
⁴ Monash IVF, Melbourne, Australia.; Monash Health, Melbourne, Australia.; Biomedicine Discovery Institute, Faculty of Biomedical Sciences, Monash University, Melbourne, Australia.
⁵ Monash IVF, Melbourne, Australia.; Biomedicine Discovery Institute, Faculty of Biomedical Sciences, Monash University, Melbourne, Australia.; School of Biomedicine, Faculty of Health and Medical Sciences, University of Adelaide, Adelaide, Australia.

PMID: 37619516
DOI: 10.1016/j.rbmo.2023.06.002

Abstract

Research question: Does advanced paternal age (APA; ≥40 years) contribute to a higher incidence of paternal origin aneuploidy in preimplantation embryos?

Design: This was a multicentre retrospective study of single-nucleotide polymorphism (SNP) microarray (Natera and Karyomapping) preimplantation genetic testing (PGT) outcomes of blastocyst-stage embryos. Whole-chromosome aneuploidy analysis was performed on 2409 embryos from 389 male patients undertaking 681 assisted reproductive technology (ART) cycles between 2012-2021. Segmental aneuploidy analysis was performed on 867 embryos from 140 men undertaking 242 ART cycles between 2016-2021. Embryos were grouped based on paternal age at sperm collection: <35, 35-39 and ≥40 years. Paternal and maternal origin aneuploidy rates were compared between groups using chi-squared and/or Fisher's exact tests.

Results: There was no significant difference across groups in paternal origin whole-chromosome aneuploidy rate, overall (P=0.7561) or when segregated by type (trisomy and monosomy: P=0.2235 and 0.8156) or complexity (single versus 2, 3 or ≥4 aneuploidies: P=0.9733, 0.7517, 0.669 and 0.1481). Conversely, maternal origin whole-chromosome aneuploidy rate differed across groups (P<0.0001) in alignment with differing mean maternal age (P<0.001). Paternal origin deletions were 2.9-fold higher than maternal origin deletions (P=0.0084), independent of age stratification. No significant difference in paternal origin deletions was observed with APA ≥40 compared with the younger age groups (4.8% versus 2.5% and 2.8%, P=0.5292). Individual chromosome aneuploidy rates were too low to perform statistical comparisons.

Conclusions: No significant association was found between APA and the incidence of paternal origin aneuploidy in preimplantation embryos, irrespective of type or complexity. Thus, APA may not be an indication for PGT.

Keywords: Advanced paternal age; Aneuploidy; IVF embryo; Preimplantation genetic testing; SNP microarray.

MeSH terms

Aneuploidy
Biopsy
Blastocyst
Humans
Male
Polymorphism, Single Nucleotide*
Retrospective Studies
Semen*