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Wincent J, Helgadóttir HT, Sergouniotis F, Salazar Mantero A, Carvalho CMB, Malmgren H, Lindstrand A, Iwarsson E. Genome sequencing differentiates a paracentric inversion from a balanced insertion enabling more accurate preimplantation genetic testing. Acta Obstet Gynecol Scand 2024; 103:1564-1569. [PMID: 38872454 PMCID: PMC11266630 DOI: 10.1111/aogs.14898] [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: 11/10/2023] [Revised: 05/13/2024] [Accepted: 05/26/2024] [Indexed: 06/15/2024]
Abstract
INTRODUCTION Distinguishing paracentric inversions (PAIs) from chromosomal insertions has traditionally relied on fluorescent in situ hybridization (FISH) techniques, but recent advancements in high-throughput sequencing have enabled the use of genome sequencing for such differentiation. In this study, we present a 38-year-old male carrier of a paracentric inversion on chromosome 2q, inv (2)(q31.2q34), whose partner experienced recurrent miscarriages. MATERIAL AND METHODS FISH analysis confirmed the inversion, and genome sequencing was employed for detailed characterization. RESULTS Preimplantation genetic testing (PGT) revealed that all assessed embryos were balanced, consistent with the low risk of unbalanced offspring associated with PAIs. While PAI carriers traditionally exhibit low risk of producing unbalanced offspring, exceptions exist due to crossover events within the inversion loop. Although the sample size was limited, the findings align with existing sperm study data, supporting the rare occurrence of unbalanced progeny in PAI carriers. CONCLUSIONS This study highlights the possibility of characterizing PAIs using genome sequencing to enable correct reproductive counseling and PGT decisions. Detailed characterization of a PAI is crucial for understanding potential outcomes and guiding PGT strategies, as accurate knowledge of the inversion size is essential for appropriate method selection in PGT. Given the very low risk of unbalanced offspring in PAI carriers, routine PGT may not be warranted but should be considered in specific cases with a history of unbalanced progeny or recurrent miscarriages. This study contributes to our understanding of PAI segregation and its implications for reproductive outcomes.
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Affiliation(s)
- Josephine Wincent
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
| | - Hafdís T. Helgadóttir
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
| | - Fotios Sergouniotis
- Department of Reproductive MedicineKarolinska University HospitalStockholmSweden
- Department of Obstetrics and GynecologyKarolinska University HospitalStockholmSweden
| | - Angelo Salazar Mantero
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
| | | | - Helena Malmgren
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
| | - Anna Lindstrand
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
| | - Erik Iwarsson
- Department of Molecular Medicine and SurgeryKarolinska InstitutetStockholmSweden
- Clinical Genetics and GenomicsKarolinska University HospitalStockholmSweden
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Samura O, Nakaoka Y, Miharu N. Sperm and Oocyte Chromosomal Abnormalities. Biomolecules 2023; 13:1010. [PMID: 37371589 DOI: 10.3390/biom13061010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 06/11/2023] [Accepted: 06/14/2023] [Indexed: 06/29/2023] Open
Abstract
Gametogenesis, the process of producing gametes, differs significantly between oocytes and sperm. Most oocytes have chromosomal aneuploidies, indicating that chromosomal aberrations in miscarried and newborn infants are of oocyte origin. Conversely, most structural anomalies are of sperm origin. A prolonged meiotic period caused by increasing female age is responsible for an increased number of chromosomal aberrations. Sperm chromosomes are difficult to analyze because they cannot be evaluated using somatic cell chromosome analysis methods. Nevertheless, researchers have developed methods for chromosome analysis of sperm using the fluorescence in situ hybridization method, hamster eggs, and mouse eggs, allowing for the cytogenetic evaluation of individual sperm. Reproductive medicine has allowed men with severe spermatogenic defects or chromosomal abnormalities to have children. However, using these techniques to achieve successful pregnancies results in higher rates of miscarriages and embryos with chromosomal abnormalities. This raises questions regarding which cases should undergo sperm chromosome analysis and how the results should be interpreted. Here, we reviewed clinical trials that have been reported on oocyte and sperm chromosome analyses. Examination of chromosomal abnormalities in gametes is critical in assisted reproductive technology. Therefore, it is necessary to continue to study the mechanism underlying gametic chromosomal abnormalities.
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Affiliation(s)
- Osamu Samura
- Department of Obstetrics and Gynecology, The Jikei University School of Medicine, Tokyo 105-8461, Japan
| | - Yoshiharu Nakaoka
- Department of Obstetrics and Gynecology, IVF Namba Clinic, Osaka 550-0015, Japan
| | - Norio Miharu
- Department of Clinical Genetics, Hiroshima Red Cross Hospital & Atomic-bomb Survivors Hospital, Hiroshima 730-0052, Japan
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Ogur C, Kahraman S, Griffin DK, Cinar Yapan C, Tufekci MA, Cetinkaya M, Temel SG, Yilmaz A. PGT for structural chromosomal rearrangements in 300 couples reveals specific risk factors but an interchromosomal effect is unlikely. Reprod Biomed Online 2022; 46:713-727. [PMID: 36803887 DOI: 10.1016/j.rbmo.2022.07.016] [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: 03/22/2022] [Revised: 07/17/2022] [Accepted: 07/25/2022] [Indexed: 11/26/2022]
Abstract
RESEARCH QUESTION What factors affect the proportion of chromosomally balanced embryos in structural rearrangement carriers? Is there any evidence for an interchromosomal effect (ICE)? DESIGN Preimplantation genetic testing outcomes of 300 couples (198 reciprocal, 60 Robertsonian, 31 inversion and 11 complex structural rearrangement carriers) were assessed retrospectively. Blastocysts were analysed either by array-comparative genomic hybridization or next-generation sequencing techniques. ICE was investigated using a matched control group and sophisticated statistical measurement of effect size (φ). RESULTS 300 couples underwent 443 cycles; 1835 embryos were analysed and 23.8% were diagnosed as both normal/balanced and euploid. The overall cumulative clinical pregnancy and live birth rates were 69.5% and 55.8%, respectively. Complex translocations and female age (≥35) were found to be risk factors associated with lower chance of having a transferable embryo (P < 0.001). Based on analysis of 5237 embryos, the cumulative de-novo aneuploidy rate was lower in carriers compared to controls (45.6% versus 53.4%, P < 0.001) but this was a 'negligible' association (φ < 0.1). A further assessment of 117,033 chromosomal pairs revealed a higher individual chromosome error rate in embryos of carriers compared to controls (5.3% versus 4.9%), which was also a 'negligible' association (φ < 0.1), despite a P-value of 0.007. CONCLUSIONS These findings suggest that rearrangement type, female age and sex of the carrier have significant impacts on the proportion of transferable embryos. Careful examination of structural rearrangement carriers and controls indicated little or no evidence for an ICE. This study helps to provide a statistical model for investigating ICE and an improved personalized reproductive genetics assessment for structural rearrangement carriers.
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Affiliation(s)
- Cagri Ogur
- Yildiz Technical University, Department of Bioengineering, Istanbul, Turkey; Igenomix Avrupa Laboratories, Istanbul, Turkey.
| | - Semra Kahraman
- Istanbul Memorial Hospital, ART and Reproductive Genetics Center, Istanbul, Turkey
| | - Darren Karl Griffin
- School of Biosciences, Centre for Interdisciplinary Studies of Reproduction, University of Kent, Canterbury CT2 7NJ, UK
| | - Cigdem Cinar Yapan
- Istanbul Memorial Hospital, ART and Reproductive Genetics Center, Istanbul, Turkey
| | - Mehmet Ali Tufekci
- Istanbul Memorial Hospital, ART and Reproductive Genetics Center, Istanbul, Turkey
| | - Murat Cetinkaya
- Istanbul Memorial Hospital, ART and Reproductive Genetics Center, Istanbul, Turkey
| | - Sehime Gulsun Temel
- Uludag University, Faculty of Medicine, Department of Medical Genetics, Bursa, Turkey.
| | - Alper Yilmaz
- Yildiz Technical University, Department of Bioengineering, Istanbul, Turkey.
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Özdemir TR, Özyılmaz B, Çakmak Ö, Kaya ÖÖ, Köse C, Kırbıyık Ö, Keskin MZ, Koç A, Zeyrek T, Kutbay YB, Erdoğan KM, Güvenç MS. Evaluation of chromosomal abnormalities and Y-chromosome microdeletions in 1696 Turkish cases with primary male infertility: A single-center study. Turk J Urol 2020; 46:95-100. [PMID: 32125967 DOI: 10.5152/tud.2019.19156] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Accepted: 11/06/2019] [Indexed: 11/22/2022]
Abstract
OBJECTIVE The aim of this study was to determine the frequencies of chromosomal abnormalities and Y-chromosome microdeletions in Turkish cases with primary male infertility in a single center. MATERIAL AND METHODS Chromosomal abnormalities and Y-chromosome microdeletions were investigated in 1696 cases with primary male infertility between 2012 and 2017. Karyotype analyzes and Y-chromosome microdeletions analyzes [azoospermia factor (AZF) regions] were performed in all cases by using standard cytogenetic methods and the multiplex polymerase chain reaction method, respectively. RESULTS Chromosomal abnormalities were found in 142 cases (8.4%; 142/1696). Y-chromosome microdeletions were detected in 46 cases (2.7%; 46/1696). Y-chromosome microdeletions in the AZFc region were found in 20 of 46 cases (43%). CONCLUSION This study is one of the few were a large number of cases was studied in Turkey. It indicates that cytogenetic and Y-chromosome microdeletion studies should be conducted in cases with primary male infertility prior to selecting assisted reproductive techniques.
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Affiliation(s)
- Taha Reşid Özdemir
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Berk Özyılmaz
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Özgür Çakmak
- Department of Urology, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Özge Özer Kaya
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Can Köse
- Department of Histology and Embryology, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Özgür Kırbıyık
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Mehmet Zeynel Keskin
- Department of Urology, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Altuğ Koç
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Tuğba Zeyrek
- Department of Histology and Embryology, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Yaşar Bekir Kutbay
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Kadri Murat Erdoğan
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
| | - Merve Saka Güvenç
- Genetic Diagnostic Center, Health Sciences University, İzmir Tepecik Training and Research Hospital, İzmir, Turkey
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Xie P, Hu L, Tan Y, Gong F, Zhang S, Xiong B, Peng Y, Lu GX, Lin G. Retrospective analysis of meiotic segregation pattern and interchromosomal effects in blastocysts from inversion preimplantation genetic testing cycles. Fertil Steril 2019; 112:336-342.e3. [PMID: 31103288 DOI: 10.1016/j.fertnstert.2019.03.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 02/26/2019] [Accepted: 03/28/2019] [Indexed: 01/31/2023]
Abstract
OBJECTIVE To determine factors affecting unbalanced chromosomal rearrangement originating from parental inversion and interchromosomal effect occurrence in blastocysts from inversion carriers. DESIGN Retrospective study. SETTING University-affiliated center. PATIENT(S) Couples with one partner carrying inversion underwent preimplantation genetic testing for chromosomal structural rearrangement cycles. INTERVENTION(S) Not applicable. MAIN OUTCOME MEASURE(S) Unbalanced rearrangement embryo rate, normal embryo rate, interchromosomal effect. RESULT(S) Preimplantation genetic testing was performed for 576 blastocysts from 57 paracentric (PAI) and 94 pericentric (PEI) inversion carriers. The percentage of normal/balanced blastocysts was significantly higher in PAI than PEI carriers (70.4% vs. 57.5%). Logistic regression indicated the inverted segment size ratio was a statistically significant risk factor for abnormality from parental inversion in both PEI and PAI. The optimal cutoff values to predict unbalanced rearrangement risk were 35.7% and 57%. In PAI, rates of abnormality from parental inversion were 0% and 12.1% in the <35.7% and ≥35.7% groups, respectively, with no gender difference. For PEI, the rates of abnormality from parental inversion were 7.9% and 33.1% in the <57% and ≥57% groups, respectively. In the ≥57% group, the rate of unbalanced rearrangement was significantly higher from paternal than maternal inversion (43.3% vs. 23.6%). In inversion carriers, 21,208 chromosomes were examined, and 187 (0.88%) malsegregations were identified from structurally normal chromosomes. In controls, 56,488 chromosomes were assessed, and 497 (0.88%) aneuploidies were identified, indicating no significant difference. CONCLUSION(S) The risk of unbalanced rearrangement is affected by the ratio of inverted segment size in both PAI and PEI carriers and is associated with gender.
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Affiliation(s)
- PingYuan Xie
- Hunan Normal University School of Medicine, Changsha, Hunan, China; National Engineering and Research Center of Human Stem Cells, Changsha, China
| | - Liang Hu
- Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China; Key Laboratory of Reproductive and Stem Cell Engineering, Ministry of Health, Changsha, China; Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, People's Republic of China
| | - Yueqiu Tan
- Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China; Key Laboratory of Reproductive and Stem Cell Engineering, Ministry of Health, Changsha, China; Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, People's Republic of China
| | - Fei Gong
- Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China; Key Laboratory of Reproductive and Stem Cell Engineering, Ministry of Health, Changsha, China; Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, People's Republic of China
| | - ShuoPing Zhang
- Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Bo Xiong
- National Engineering and Research Center of Human Stem Cells, Changsha, China
| | - Yangqin Peng
- Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China
| | - Guang Xiu Lu
- National Engineering and Research Center of Human Stem Cells, Changsha, China; Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China; Key Laboratory of Reproductive and Stem Cell Engineering, Ministry of Health, Changsha, China; Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, People's Republic of China
| | - Ge Lin
- National Engineering and Research Center of Human Stem Cells, Changsha, China; Reproductive and Genetic Hospital of CITIC-Xiangya, Changsha, China; Key Laboratory of Reproductive and Stem Cell Engineering, Ministry of Health, Changsha, China; Institute of Reproductive and Stem Cell Engineering, School of Basic Medical Science, Central South University, Changsha, People's Republic of China.
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Knief U, Hemmrich-Stanisak G, Wittig M, Franke A, Griffith SC, Kempenaers B, Forstmeier W. Fitness consequences of polymorphic inversions in the zebra finch genome. Genome Biol 2016; 17:199. [PMID: 27687629 PMCID: PMC5043542 DOI: 10.1186/s13059-016-1056-3] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Accepted: 09/05/2016] [Indexed: 12/21/2022] Open
Abstract
Background Inversion polymorphisms constitute an evolutionary puzzle: they should increase embryo mortality in heterokaryotypic individuals but still they are widespread in some taxa. Some insect species have evolved mechanisms to reduce the cost of embryo mortality but humans have not. In birds, a detailed analysis is missing although intraspecific inversion polymorphisms are regarded as common. In Australian zebra finches (Taeniopygia guttata), two polymorphic inversions are known cytogenetically and we set out to detect these two and potentially additional inversions using genomic tools and study their effects on embryo mortality and other fitness-related and morphological traits. Results Using whole-genome SNP data, we screened 948 wild zebra finches for polymorphic inversions and describe four large (12–63 Mb) intraspecific inversion polymorphisms with allele frequencies close to 50 %. Using additional data from 5229 birds and 9764 eggs from wild and three captive zebra finch populations, we show that only the largest inversions increase embryo mortality in heterokaryotypic males, with surprisingly small effect sizes. We test for a heterozygote advantage on other fitness components but find no evidence for heterosis for any of the inversions. Yet, we find strong additive effects on several morphological traits. Conclusions The mechanism that has carried the derived inversion haplotypes to such high allele frequencies remains elusive. It appears that selection has effectively minimized the costs associated with inversions in zebra finches. The highly skewed distribution of recombination events towards the chromosome ends in zebra finches and other estrildid species may function to minimize crossovers in the inverted regions. Electronic supplementary material The online version of this article (doi:10.1186/s13059-016-1056-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ulrich Knief
- Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, 82319, Seewiesen, Germany. .,Current address: Division of Evolutionary Biology, Faculty of Biology, Ludwig Maximilian University of Munich, 82152, Planegg-Martinsried, Germany.
| | - Georg Hemmrich-Stanisak
- Institute of Clinical Molecular Biology, Christian-Albrechts-University, 24105, Kiel, Germany
| | - Michael Wittig
- Institute of Clinical Molecular Biology, Christian-Albrechts-University, 24105, Kiel, Germany
| | - Andre Franke
- Institute of Clinical Molecular Biology, Christian-Albrechts-University, 24105, Kiel, Germany
| | - Simon C Griffith
- Department of Biological Sciences, Macquarie University, Sydney, NSW, 2109, Australia.,School of Biological, Earth & Environmental Sciences, University of New South Wales, Sydney, NSW, 2057, Australia
| | - Bart Kempenaers
- Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, 82319, Seewiesen, Germany
| | - Wolfgang Forstmeier
- Department of Behavioural Ecology and Evolutionary Genetics, Max Planck Institute for Ornithology, 82319, Seewiesen, Germany
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