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Yamazaki A, Kuroda T, Kawasaki N, Kato K, Shimojima Yamamoto K, Iwasa T, Kuwahara A, Taniguchi Y, Takeshita T, Kita Y, Mikami M, Irahara M, Yamamoto T. Preimplantation genetic testing using comprehensive genomic copy number analysis is beneficial for balanced translocation carriers. J Hum Genet 2024; 69:41-45. [PMID: 37872345 DOI: 10.1038/s10038-023-01202-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 09/01/2023] [Accepted: 10/11/2023] [Indexed: 10/25/2023]
Abstract
Balanced chromosomal translocation is one of chromosomal variations. Carriers of balanced chromosomal translocations have an increased risk of spontaneous miscarriage. To avoid the risk, preimplantation genetic testing (PGT) using comprehensive genomic copy number analysis has been developed. This study aimed to verify whether and how embryos from couples in which one partner is a balanced translocation carrier have a higher ratio of chromosomal abnormalities. A total of 894 biopsied trophectoderms (TEs) were obtained from 130 couples in which one partner was a balanced translocation carrier (Robertsonian translocation, reciprocal translocation, or intrachromosomal inversion) and grouped as PGT-SR. Conversely, 3269 TEs from 697 couples who experienced recurrent implantation failure or recurrent pregnancy loss were included in the PGT-A group. The transferable blastocyst ratio was significantly lower in the PGT-SR group, even when bias related to the sample number and patient age was corrected. Subgroup analysis of the PGT-SR group revealed that the transferable blastocyst ratio was higher in the Robertsonian translocation group. Because the PGT-SR group had a higher proportion of untransferable embryos than the PGT-A group, PGT using comprehensive genomic copy number analysis was more beneficial for balanced translocation carriers than for infertility patients without chromosomal translocations. The frequencies of de novo aneuploidies were further analyzed, and the frequency in the PGT-SR group was lower than that in the PGT-A group. Therefore, we could not confirm the existence of interchromosomal effects in this study.
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Affiliation(s)
- Aya Yamazaki
- Division of Gene Medicine, Graduate School of Medical Science, Tokyo Women's Medical University, Tokyo, 162-8666, Japan
- Institute of Medical Genetics, Tokyo Women's Medical University, Tokyo, 162-8666, Japan
| | | | | | | | - Keiko Shimojima Yamamoto
- Institute of Medical Genetics, Tokyo Women's Medical University, Tokyo, 162-8666, Japan
- Department of Transfusion Medicine and Cell Processing, Tokyo Women's Medical University, Tokyo, 162-8666, Japan
| | - Takeshi Iwasa
- Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, 770-0042, Japan
| | - Akira Kuwahara
- Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, 770-0042, Japan
- Clinic Cosmos, Kochi, 780-0072, Japan
| | - Yuka Taniguchi
- Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, 770-0042, Japan
| | - Toshiyuki Takeshita
- Department of Obstetrics and Gynecology, Nippon Medical University, Tokyo, 113-8602, Japan
- Takeshita Ladies Clinic, Tokyo, 160-0017, Japan
| | - Yosuke Kita
- Department of Psychology, Faculty of Letters, Keio University, Tokyo, 108-8345, Japan
| | - Mikio Mikami
- Department of Obstetrics and Gynecology, Tokai University School of Medicine, Kanagawa, 259-1143, Japan
| | - Minoru Irahara
- Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Tokushima University, Tokushima, 770-0042, Japan
| | - Toshiyuki Yamamoto
- Division of Gene Medicine, Graduate School of Medical Science, Tokyo Women's Medical University, Tokyo, 162-8666, Japan.
- Institute of Medical Genetics, Tokyo Women's Medical University, Tokyo, 162-8666, Japan.
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Stukaitė-Ruibienė E, Gudlevičienė Ž, Amšiejienė A, Dagytė E, Gricius R, Grigalionienė K, Utkus A, Ramašauskaitė D. Implementation and Evaluation of Preimplantation Genetic Testing at Vilnius University Hospital Santaros Klinikos. Acta Med Litu 2022; 29:225-235. [PMID: 37733426 PMCID: PMC9799000 DOI: 10.15388/amed.2022.29.2.9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 07/11/2022] [Accepted: 08/10/2022] [Indexed: 11/22/2022] Open
Abstract
Background and Objectives The most effective treatment of infertility is in vitro fertilization (IVF). IVF with Preimplantation Genetic Testing (PGT) allows to identify embryos with a genetic abnormality associated with a specific medical disorder and to select the most optimal embryos for the transfer. PGT is divided into structural rearrangement testing (PGT-SR), monogenetic disorder testing (PGT-M), and aneuploidy testing (PGT-A). This study mostly analyzes PGT-SR, also describes a few cases of PGT-M. The aim of this study was to implement PGT procedure at Vilnius University Hospital Santaros Klinikos (VUHSK) Santaros Fertility Centre (SFC) and to perform retrospective analysis of PGT procedures after the implementation. Materials and Methods A single-center retrospective analysis was carried out. The study population included infertile couples who underwent PGT at SFC, VUHSK from January 01st, 2017 to December 31st, 2020. Ion PGM platform (Life Technologies, USA) and Ion ReproSeq PGS View Kit (Life Technologies, USA) were used for the whole genome amplification. Results were assessed using descriptive statistics. Results PGT was successfully implemented in VUHSK in 2017. During the analyzed time period, thirty-four PGT procedures were performed for 26 couples. Two procedures were performed in 2017, 7 procedures - in 2018, 13 - in 2019, and 12 - in 2020. In comparison with all IVF procedures, 2.5% procedures were IVF with PGT, a highest percentage was in 2020 (3.8% of all procedures). The main indication for PGT was balanced chromosomal rearrangements (in 85.3% cases). In all 34 cases 515 oocytes were aspirated in total, 309 oocytes were fertilized, oocytes fertilization rate exceeded 60%. A normal diploid karyotype was found in 46 (16.8%) biopsied embryos. Out of all PGT procedures, 9 (26.5%) resulted in a clinical pregnancy. Six (66.7%) pregnancies were confirmed in 2019, and 3 (33.3%) - in 2020. Three (33.3%) pregnancies resulted in spontaneous abortion, 6 (66.7%) - in delivery. Conclusions The implementation of PGT in VUHSK was successful. The most common indication for PGT was a reciprocal translocation. Oocytes fertilization rate exceeded 60%, a normal karyotype was found less than in one-fifth of biopsied embryos. A highest clinical pregnancy rate was achieved in 2019 when almost half of women conceived, which is probably related to the experience gained by the multidisciplinary team. This is the first study analyzing IVF with PGT in Lithuania, however, the results should be interpreted with caution due to a low number of total procedures performed.
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Affiliation(s)
| | | | - Andrė Amšiejienė
- Centre of Obstetrics and Gynaecology, Santaros Fertility Centre, Institute of Clinical Medicine, Faculty of Medicine Vilnius University, Lithuania
| | - Evelina Dagytė
- Centre for Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine Vilnius University, Lithuania
| | - Rimantas Gricius
- Centre of Obstetrics and Gynaecology, Santaros Fertility Centre, Institute of Clinical Medicine, Faculty of Medicine Vilnius University, Lithuania
| | - Kristina Grigalionienė
- Centre for Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine Vilnius University, Lithuania
| | - Algirdas Utkus
- Vilnius University, Faculty of Medicine, Vilnius, Lithuania
- Centre for Medical Genetics, Institute of Biomedical Sciences, Faculty of Medicine Vilnius University, Lithuania
| | - Diana Ramašauskaitė
- Vilnius University, Faculty of Medicine, Vilnius, Lithuania
- Centre of Obstetrics and Gynaecology, Institute of Clinical Medicine, Faculty of Medicine Vilnius University, Lithuania
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Dufton M, Bouzayen R. Complex reciprocal translocations, more complex than initially thought: a case report. F S Rep 2021; 2:487-492. [PMID: 34934992 PMCID: PMC8655409 DOI: 10.1016/j.xfre.2021.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 08/16/2021] [Accepted: 08/20/2021] [Indexed: 11/23/2022] Open
Abstract
Objective To present a case of a couple who experienced spontaneous abortion after the transfer of a preimplantation genetic testing for structural rearrangement (PGT-SR) normal/balanced embryo. The embryo was later determined to have significant paternally inherited chromosome deletion that was not previously identified as part of a complex translocation. Design Case report. Setting Single infertility practice. Patient(s) A 35-year-old patient with a history of five spontaneous abortions and her 36-years-old partner, a carrier of a balanced reciprocal translocation. Intervention(s) In vitro fertilization with PGT-SR and follow-up genetic testing. Main Outcome Measure(s) Identification of a paternal reciprocal translocation, pregnancy outcome after PGT-SR, and follow-up genetic testing after the spontaneous abortion of a PGT-SR normal/balanced embryo. Result(s) Karyotyping for a couple with a history of recurrent pregnancy loss identified a paternal reciprocal translocation between chromosomes 5 and 17 after G-banding analysis. In vitro fertilization with PGT-SR resulted in one normal/balanced embryo. The couple experienced a 9-week spontaneous abortion of the transfer of the embryo. Testing of product of conception identified a 3.2-Mb deletion on chromosome 17 resulting in the loss of 55 known genes and deemed likely pathogenic. Repeat karyotyping using G-banding and metaphase fluorescence in situ hybridization identified an additional chromosomal translocation, a segment of chromosome 17 translocated to chromosome 6, the same segment of deoxyribonucleic acid absent from the fetus. Conclusion(s) Preimplantation genetic testing for structural rearrangement cases are complex. Genetic testing must be completed with the best available technology by a reliable testing center. We, therefore, recommend that all chromosomal translocations detected by G-banding be further investigated with metaphase fluorescence in situ hybridization. When unexpected results occur in this patient population, testing beyond the standard of care may be required, including advanced molecular testing.
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Affiliation(s)
- Megan Dufton
- Atlantic Assisted Reproductive Therapies, Halifax, Novia Scotia, Canada.,Department of Obstetrics and Gynecology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Renda Bouzayen
- Atlantic Assisted Reproductive Therapies, Halifax, Novia Scotia, Canada.,Department of Obstetrics and Gynecology, Dalhousie University, Halifax, Nova Scotia, Canada
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