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Wu Y, Liao C, Xie Y, Wang L. Prenatal Diagnosis of a de novo 2q14.3-q22.1 Deletion with Complex Chromosomal Rearrangement. Mol Syndromol 2024; 15:71-76. [PMID: 38357262 PMCID: PMC10862312 DOI: 10.1159/000531769] [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: 01/01/2023] [Accepted: 06/27/2023] [Indexed: 02/16/2024] Open
Abstract
Introduction Chromosomal aberrations due to complex chromosomal rearrangements (CCRs) can cause abnormal phenotypes if accompanied by microdeletions or microduplications near the breakpoint, or gene breaks. Case Presentation We report a prenatal diagnostic case of 2q14.3-q22.1 deletion with ultrasound suggestive of absent nasal bone accompanied by CCRs involving 6 chromosomes. Cytogenetic analysis revealed a karyotype of 46,XY,der(1)t(1;2)(p13.3;p11.2),der(2)t(1;2)inv(2)(q12q14.2)del(2)(q14.3q22.1),t(12;16)(q21.2;q12.1),t(13;21)(q32;q22.1). Chromosomal microarray analysis identified a 14.90 Mb deletion on 2q14.3q22.1. The copy number variant was de novo, as determined by karyotype analysis of the parents' peripheral blood G-banding. Conclusion The region contains haploinsufficient genes that can cause different phenotypes, mainly associated with neurodevelopmental and autism spectrum disorders. However, the genotype-phenotype correlation is limited in prenatal evaluation. Therefore, the combined use of multiple diagnostic techniques has an important role in the assessment of CCRs and genetic counseling.
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Affiliation(s)
- Yong Wu
- Prenatal Diagnosis Center, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Chuanning Liao
- Prenatal Diagnosis Center, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Yamei Xie
- Prenatal Diagnosis Center, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
| | - Lingxi Wang
- Prenatal Diagnosis Center, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, China
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Li S, Li H, Gao Y, Zou Y, Yin X, Chen ZJ, Choy KW, Dong Z, Yan J. Identification of cryptic balanced translocations in couples with unexplained recurrent pregnancy loss based upon embryonic PGT-A results. J Assist Reprod Genet 2024; 41:171-184. [PMID: 38102500 PMCID: PMC10789697 DOI: 10.1007/s10815-023-02999-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 11/27/2023] [Indexed: 12/17/2023] Open
Abstract
PURPOSE The goal of this study is to determine whether any balanced translocation (BT) had been missed by previous karyotyping in patients with unexplained recurrent pregnancy loss (uRPL). METHODS This case series included 48 uRPL-affected couples with normal karyotypes. The embryos from these couples have all undergone preimplantation testing for aneuploidies (PGT-A). Based on the PGT-A's results, 48 couples could be categorized into two groups: 17 couples whose multiple embryos were detected with similar structural variations (SVs, segmental/complete) and 31 couples without such findings but who did not develop any euploid embryo despite at least three high-quality blastocysts being tested. The peripheral blood sample of each partner was then collected for mate-pair sequencing (MPseq) to determine whether any of them were BT carriers. RESULTS MPseq analyses identified 13 BTs in the 17 couples whose multiple embryos had similar SVs detected (13/17, 76.47%) and three BTs in the 31 couples without euploid embryo obtained (3/31, 9.7%). Among the 16 MPseq-identified BTs, six were missed due to the limited resolution of G-banding karyotyping analysis, and the rest were mostly owing to the similar banding patterns and/or comparable sizes shared by the two segments exchanged. CONCLUSION A normal karyotype does not eliminate the possibility of carrying BT for couples with uRPL. The use of PGT-A allows us to perceive the "carrier couples" missed by karyotyping analysis, providing an increased risk of finding cryptic BTs if similar SVs are always detected on two chromosomes among multiple embryos. Nonetheless, certain carriers with translocated segments of sub-resolution may still go unnoticed.
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Affiliation(s)
- Shuo Li
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Hongchang Li
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Yuan Gao
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Yang Zou
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Xunqiang Yin
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Zi-Jiang Chen
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
- Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics, Shanghai Jiao Tong University, Shanghai, China
- Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Kwong Wai Choy
- Department of Obstetrics & Gynecology, The Chinese University of Hong Kong, Hong Kong, China.
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.
- The Chinese University of Hong Kong-Baylor College of Medicine Joint Center For Medical Genetics, Hong Kong, China.
- Hong Kong Branches of Chinese National Engineering Research Centers-Center for Assisted Reproductive Technology and Reproductive Genetics, Hong Kong, China.
| | - Zirui Dong
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China.
- Department of Obstetrics & Gynecology, The Chinese University of Hong Kong, Hong Kong, China.
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.
| | - Junhao Yan
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China.
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China.
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China.
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China.
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China.
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Tšuiko O, Dmitrijeva T, Kask K, Tammur P, Tõnisson N, Salumets A, Jatsenko T. Detection of a balanced translocation carrier through trophectoderm biopsy analysis: a case report. Mol Cytogenet 2019; 12:28. [PMID: 31244893 PMCID: PMC6582470 DOI: 10.1186/s13039-019-0444-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 06/11/2019] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND Balanced translocation carriers are burdened with fertility issues due to improper chromosome segregation in gametes, resulting in either implantation failure, miscarriage or birth of a child with chromosomal disorders. At the same time, these individuals are typically healthy with no signs of developmental problems, hence they often are unaware of their condition. Yet, because of difficulties in conceiving, balanced translocation carriers often turn to assisted reproduction, some of whom may also undergo preimplantation genetic testing for aneuploidy (PGT-A) to improve the likelihood of achieving a successful pregnancy. CASE REPORT We describe a female patient, who pursued in vitro fertilization (IVF) treatment coupled with PGT-A following two consecutive miscarriages, unaware of her genetic condition. PGT-A was performed on blastocyst-stage embryos and the results of comprehensive chromosome screening from a first IVF cycle demonstrated reciprocal segmental aberrations on chromosome 7 and chromosome 10 in two out of four embryos. Due to distinct embryo profiles, the couple was then referred for genetic counselling and subsequent parental karyotyping revealed the presence of a previously undetected balanced translocation in the mother. CONCLUSIONS These results confirm previous reports that genome-wide PGT-A can facilitate the identification of balanced translocation carriers in IVF patients, providing explanation for poor reproductive outcome and allowing adjustments in treatment strategies.
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Affiliation(s)
- Olga Tšuiko
- Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
| | - Tuuli Dmitrijeva
- BioEximi OÜ, Sõle 23, 10614 Tallinn, Estonia
- Women’s Clinic, West-Tallinn Central Hospital, Sõle 23, 10614 Tallinn, Estonia
| | - Katrin Kask
- Women’s Clinic, West-Tallinn Central Hospital, Sõle 23, 10614 Tallinn, Estonia
| | - Pille Tammur
- Department of Clinical Genetics, United Laboratories, Tartu University Hospital, L. Puusepa 2, 51014 Tartu, Estonia
| | - Neeme Tõnisson
- Department of Clinical Genetics in Tallinn, United Laboratories, Tartu University Hospital, L. Puusepa 2, 51014 Tartu, Estonia
- Estonian Genome Center, University of Tartu, Riia 23b, 51010 Tartu, Estonia
| | - Andres Salumets
- Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
- Institute of Bio- and Translational Medicine, University of Tartu, Ravila 19, 50411 Tartu, Estonia
- Department of Obstetrics and Gynaecology, University of Tartu, L. Puusepa 8, 50406 Tartu, Estonia
- Department of Obstetrics and Gynaecology, University of Helsinki and Helsinki University Hospital, Haartmaninkatu 2, 00029 Helsinki, Finland
| | - Tatjana Jatsenko
- Competence Centre on Health Technologies, Tiigi 61b, 50410 Tartu, Estonia
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Fodina V, Dudorova A, Alksere B, Dzalbs A, Vedmedovska N, Andersone S, Una C, Juris E, Dace B. The application of PGT-A for carriers of balanced structural chromosomal rearrangements. Gynecol Endocrinol 2019; 35:18-23. [PMID: 31532310 DOI: 10.1080/09513590.2019.1632091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
The aim of this study was to analyze differences in chromosomal aberrations and euploidy in embryos of each translocation type and gender of carrier in the case series of 10 couples with balanced translocations who underwent IVF with embryos trophectoderm (TE) biopsy and PGT-A to detect chromosomal aberrations. This is a Case Series (Retrospective study). In each case, controlled ovarian hyperstimulation, oocyte insemination with intracytoplasmic sperm injection (ICSI) and cultivation gave multiple blastocysts, that underwent trophectoderm (TE) biopsy with PGT-A analysis using aCGH and NGS. Number of total unbalanced translocations compared to the number of sporadic aneuploid embryos was 39.6% to 39.6% (50% to 50% of all 37 aneuploid embryos). The highest euploidy rate was in male carrier group - 26.7% and the lowest in the Robertsonian translocation carrier group - 18.2%. Sporadic aneuploidy - 68.2% was highest in Robertsonian translocation carrier group and lowest in female group - 11.1%. Chromosomal aberrations related to translocation were highest in female carrier group - 77.8% and lowest in Robertsonian translocation carrier group - 13.6%. Our study showed that expectancy of total embryo aneuploidy rates will be higher in carriers, than in people with normal karyotype. The prevalence of chromosomal aberrations related to translocation was 4.5 times higher in Reciprocal carrier group than in Robertsonian translocation carrier group. Among maternal and paternal carrier groups, the embryos from female carriers had the lowest euploidy rate, unbalanced translocation rate 4.7 times higher than in the male carrier group and higher total aneuploidy rates.
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Affiliation(s)
- Violeta Fodina
- Department of Gynecology and Reproduction, Clinic "IVF-Riga" , Riga , Latvia
| | | | - Baiba Alksere
- Genetic laboratory, Clinic "IVF-Riga" , Riga , Latvia
| | - Aigars Dzalbs
- Genetic laboratory, Clinic "IVF-Riga" , Riga , Latvia
- Center of Medical Genetics and Prenatal Diagnostics, Children's Clinical University Hospital , Riga , Latvia
| | | | | | - Conka Una
- Genetic laboratory, Clinic "IVF-Riga" , Riga , Latvia
| | - Erenpreiss Juris
- Department of Andrology, Clinic "IVF-Riga" , Riga , Latvia
- Riga Stradins University , Latvia
| | - Berzina Dace
- Genetic laboratory, Clinic "IVF-Riga" , Riga , Latvia
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