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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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