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Guarneri C, Reschini M, Pinna M, Perego L, Sanzani E, Somigliana E, Sorrentino U, Cassina M, Zuccarello D, Ciaffaglione M. The impact of a second embryo biopsy for preimplantation genetic testing for monogenic diseases (PGT-M) with inconclusive results on pregnancy potential: results from a matched case-control study. J Assist Reprod Genet 2024:10.1007/s10815-024-03078-w. [PMID: 38557804 DOI: 10.1007/s10815-024-03078-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 02/27/2024] [Indexed: 04/04/2024] Open
Abstract
PURPOSE To evaluate whether a second biopsy, following a first diagnostic failure on blastocysts tested for preimplantation genetic testing for monogenic diseases (PGT-M), allows to obtain genetic diagnosis and to what extent this procedure can influence clinical pregnancy and live birth rates compared to the PGT-M process with a successful genetic diagnosis from the first biopsy. METHODS Embryos from women who underwent PGT-M in an infertility centre and who had been transferred after two biopsies for genetic analysis (n = 27) were matched in a 1:1 ratio accordingly to women's age (± 1 year) and fertility status (fertile vs infertile), as well as with the study period, with embryos who were transferred after receiving a conclusive PGT result straight after the first biopsy (n = 27). The main evaluated outcome was clinical pregnancy rate following embryo transfers in which healthy embryos were transferred after only one biopsy and those in which an embryo was transferred after being re-biopsied. Live birth rate was the secondary outcome. RESULTS Clinical pregnancy rate was 52% (95% CI: 34-69) following the transfer of a single-biopsy blastocyst and 30% (95% CI: 16-48) following the transfer of a re-biopsied blastocyst. The likelihood to have a healthy baby was 33% (95% CI: 19-52) following the transfer of a blastocyst biopsied once and 22% (95% CI: 11-41) following the transfer of a re-biopsied blastocyst. CONCLUSIONS The re-biopsy intervention seems to considerably reduce the pregnancy potential of a blastocyst. However, a greater sample size is necessary to clarify this issue definitively.
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Affiliation(s)
- Cristina Guarneri
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy.
| | - Marco Reschini
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
| | - Monica Pinna
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
| | - Lucia Perego
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
| | - Elena Sanzani
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
| | - Edgardo Somigliana
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
| | - Ugo Sorrentino
- Department of Lab Medicine, Unit of Clinical Genetics and Epidemiology, University Hospital of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - Matteo Cassina
- Department of Lab Medicine, Unit of Clinical Genetics and Epidemiology, University Hospital of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - Daniela Zuccarello
- Department of Lab Medicine, Unit of Clinical Genetics and Epidemiology, University Hospital of Padova, Via Giustiniani 2, 35128, Padova, Italy
| | - Marta Ciaffaglione
- Infertility Unit, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Via Manfredo Fanti 6, 20122, Milano, Italy
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Wu H, Chen D, Zhao Q, Shen X, Liao Y, Li P, Chiu PCN, Zhou C. Long-read sequencing on the SMRT platform enables efficient haplotype linkage analysis in preimplantation genetic testing for β-thalassemia. J Assist Reprod Genet 2022; 39:739-46. [PMID: 35141813 DOI: 10.1007/s10815-022-02415-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 01/26/2022] [Indexed: 10/19/2022] Open
Abstract
PURPOSE This study aimed to evaluate the value of long-read sequencing for preimplantation haplotype linkage analysis. METHODS The genetic material of the three β-thalassemia mutation carrier couples was sequenced using single-molecule real-time sequencing in the 7.7-kb region of the HBB gene and a 7.4-kb region that partially overlapped with it to detect the presence of 17 common HBB gene mutations in the Chinese population and the haplotypes formed by the continuous array of single-nucleotide polymorphisms linked to these mutations. By using the same method to analyze multiple displacement amplification products of embryos from three families and comparing the results with those of the parents, it could be revealed whether the embryos carry disease-causing mutations without the need for a proband. RESULTS The HBB gene mutations of the three couples were accurately detected, and the haplotype linked to the pathogenic site was successfully obtained without the need for a proband. A total of 68.75% (22/32) of embryos from the three families successfully underwent haplotype linkage analysis, and the results were consistent with the results of NGS-based mutation site detection. CONCLUSION This study supports long-read sequencing as a potential tool for preimplantation haplotype linkage analysis.
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