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Wang Y, Lazier J, Myles‐Reid D, Noor A, Chitayat D, Greenfeld E. Role of comprehensive cytogenomic investigation in successful reproductive outcome of parental small neocentromeric supernumerary ring chromosome: A case report. Clin Case Rep 2023; 11:e6632. [PMID: 37102101 PMCID: PMC10123304 DOI: 10.1002/ccr3.6632] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 10/31/2022] [Accepted: 11/08/2022] [Indexed: 04/28/2023] Open
Abstract
Small supernumerary marker chromosomes (sSMC) can form small supernumerary ring chromosomes (sSRC). Loss of parentally inherited sSRC containing vital gene content may cause an "unbalanced" karyotype and fetal microdeletion syndromes. Rarely, sSRC with neocentromere can be inherited, leading to a "balanced" karyotype, which can be diagnosed with preimplantation genetic testing.
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Affiliation(s)
- Yiming Wang
- Division of Clinical and Metabolic Genetics, Department of PediatricsThe Hospital for Sick Children, University of TorontoTorontoOntarioCanada
- Medical Genetics and Genomics Residency ProgramUniversity of TorontoTorontoOntarioCanada
| | - Joanna Lazier
- Department of Medical GeneticsChildren's Hospital of Eastern Ontario, University of OttawaOttawaOntarioCanada
| | - Diane Myles‐Reid
- The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and GynecologyMount Sinai Hospital, University of TorontoTorontoOntarioCanada
| | - Abdul Noor
- The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and GynecologyMount Sinai Hospital, University of TorontoTorontoOntarioCanada
- Department of Laboratory Medicine and PathobiologyUniversity of TorontoTorontoOntarioCanada
- Department of Pathology and Laboratory MedicineMount Sinai Hospital, University of TorontoTorontoOntarioCanada
| | - David Chitayat
- Division of Clinical and Metabolic Genetics, Department of PediatricsThe Hospital for Sick Children, University of TorontoTorontoOntarioCanada
- The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and GynecologyMount Sinai Hospital, University of TorontoTorontoOntarioCanada
- Department of Laboratory Medicine and PathobiologyUniversity of TorontoTorontoOntarioCanada
| | - Elena Greenfeld
- The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and GynecologyMount Sinai Hospital, University of TorontoTorontoOntarioCanada
- Department of Laboratory Medicine and PathobiologyUniversity of TorontoTorontoOntarioCanada
- Department of Pathology and Laboratory MedicineMount Sinai Hospital, University of TorontoTorontoOntarioCanada
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El Fekih S, Gueganic N, Tous C, Douet-Guilbert N, Blesson S, Morel F, Perrin A. Meiotic Segregation of an Isodicentric Derived from Chromosome 15 in Sperm of a Patient with Mosaic Karyotype: Case Report and Review of the Literature. Cytogenet Genome Res 2022; 162:34-39. [PMID: 35390789 DOI: 10.1159/000523916] [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: 12/20/2021] [Accepted: 03/02/2022] [Indexed: 11/19/2022] Open
Abstract
Small supernumerary marker chromosomes (sSMCs) are defined as structurally abnormal chromosomes that are difficult to identify by conventional cytogenetic techniques. sSMCs are 3.75 times more common in infertile men than in the general population. This study aimed at characterizing a supernumerary marker chromosome in a nonconsanguineous infertile couple and analyzing its meiotic segregation in sperm by multicolor FISH. The male partner's karyotype was mos 47,XY,+idic(15)(pter→q11.1::q11.1→pter)[6]/46,XY[24].ish idic(15)(NOR+,D15Z3+,SNRPN-,D15Z3+,NOR+). In triple FISH using CEP 15, BAC 15, and BAC 21 probes, 4,227 spermatozoa of the patient were analyzed, and the sSMC was detected in only 0.66% of spermatozoa. In triple FISH employing CEP X, CEP Y, and BAC 18 probes, 2,008 spermatozoa of the patient were analyzed. The frequency of disomic and diploid sperm was not significantly different from control donors. To our knowledge, segregation of an sSMC 15 has been reported in only 9 males with non-mosaic karyotypes. These studies described rates of spermatozoa with sSMC 15 ranging from 6.23% to more than 50%. In this work, we report the first meiotic segregation analysis of a chromosome 15-derived sSMC in spermatozoa of a patient with a mosaic karyotype. The low rate of spermatozoa with sSMC detected is concordant with the low proportion of abnormal cells in our patient's lymphocytes. Moreover, the risk of interference of this sSMC with other chromosomes seems minimal. Genetic counseling was recommended given that the risk of chromosomal imbalance in the fetus linked to paternal sSMC was very low. Finally, a healthy boy was born after a natural pregnancy.
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Affiliation(s)
- Sahar El Fekih
- Faculty of Medicine and Health Sciences, University of Brest, EFS, UMR1078, GGB, Brest, France.,Department of Medical Genetics and Reproductive Biology, Brest University Regional Hospital, Brest, France
| | - Nadia Gueganic
- Faculty of Medicine and Health Sciences, University of Brest, EFS, UMR1078, GGB, Brest, France
| | - Corinne Tous
- Department of Medical Genetics and Reproductive Biology, Brest University Regional Hospital, Brest, France
| | - Nathalie Douet-Guilbert
- Faculty of Medicine and Health Sciences, University of Brest, EFS, UMR1078, GGB, Brest, France.,Department of Medical Genetics and Reproductive Biology, Brest University Regional Hospital, Brest, France
| | - Sophie Blesson
- Department of Genetics, Tours University Hospital, Tours, France
| | - Frédéric Morel
- Faculty of Medicine and Health Sciences, University of Brest, EFS, UMR1078, GGB, Brest, France.,Department of Medical Genetics and Reproductive Biology, Brest University Regional Hospital, Brest, France
| | - Aurore Perrin
- Faculty of Medicine and Health Sciences, University of Brest, EFS, UMR1078, GGB, Brest, France.,Department of Medical Genetics and Reproductive Biology, Brest University Regional Hospital, Brest, France
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Slimani W, Jelloul A, Al-Rikabi A, Sallem A, Hasni Y, Chachia S, Ernez A, Chaieb A, Bibi M, Liehr T, Saad A, Mougou-Zerelli S. Small supernumerary marker chromosomes (sSMC) and male infertility: characterization of five new cases, review of the literature, and perspectives. J Assist Reprod Genet 2020; 37:1729-1736. [PMID: 32399795 PMCID: PMC7376793 DOI: 10.1007/s10815-020-01811-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 05/06/2020] [Indexed: 11/29/2022] Open
Abstract
PURPOSE To characterize small supernumerary marker chromosomes (sSMC) in infertile males RESEARCH QUESTION: Are molecular cytogenetic methods still relevant for the identification and characterization of sSMC in the era of next-generation sequencing? METHODS In this paper, we report five males with oligoasthenozoospermia or azoospermia with a history of recurrent pregnancy loss in partnership in four cases. R-banding karyotyping and fluorescence in situ hybridization (FISH) analysis were performed and showed sSMC in all five cases. Microdissection and reverse-FISH were performed in one case. RESULTS One sSMC, each, was derived from chromosome 15 and an X-chromosome; two sSMC were derivatives of chromosome 22. The fifth sSMC was a ring chromosome 4 complemented by a deletion of the same region 4p14 to 4p16.1 in one of the normal chromosomes 4. All markers were mosaics except one of sSMC(22). CONCLUSION Through this study, we emphasize the necessity of a proper combination of high-throughput techniques with conventional cytogenetic and FISH methods. This could provide a personalized diagnostic and accurate results for the patients suffering from infertility or RPL. We also highlight FISH analyses, which are essential tools for detecting sSMC in infertile patients. In fact, despite its entire composition of heterochromatin, sSMC can have effects on spermatogenesis by producing mechanical perturbations during meiosis and increasing meiotic nondisjunction rate. This would contribute to understand the exact chromosomal mechanism disrupting the natural and the assisted reproduction leading to offer a personalized support.
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Affiliation(s)
- Wafa Slimani
- Department of Cytogenetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
- Higher Institute of Biotechnology of Monastir, University of Monastir, Monastir, Tunisia
- Unité de Services Communs en Génétique Humaine, Université de Sousse, Faculté de Médecine de Sousse, Sousse, Tunisia
| | - Afef Jelloul
- Department of Cytogenetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
| | | | - Amira Sallem
- Department of Cytogenetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
| | - Yosra Hasni
- Department of Endocrinology-Diabetology, Farhat Hached University Hospital, Sousse, Tunisia
| | - Salma Chachia
- Department of Obstetrics and Gynecology, Farhat Hached University Hospital, Sousse, Tunisia
| | | | - Anouar Chaieb
- Department of Obstetrics and Gynecology, Farhat Hached University Hospital, Sousse, Tunisia
| | - Mohamed Bibi
- Department of Obstetrics and Gynecology, Farhat Hached University Hospital, Sousse, Tunisia
| | | | - Ali Saad
- Department of Cytogenetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia
- Unité de Services Communs en Génétique Humaine, Université de Sousse, Faculté de Médecine de Sousse, Sousse, Tunisia
| | - Soumaya Mougou-Zerelli
- Department of Cytogenetics and Reproductive Biology, Farhat Hached University Hospital, Sousse, Tunisia.
- Unité de Services Communs en Génétique Humaine, Université de Sousse, Faculté de Médecine de Sousse, Sousse, Tunisia.
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Whole-genome mate-pair sequencing of apparently balanced chromosome rearrangements reveals complex structural variations: two case studies. Mol Cytogenet 2020; 13:15. [PMID: 32391085 PMCID: PMC7201554 DOI: 10.1186/s13039-020-00487-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Accepted: 04/24/2020] [Indexed: 11/10/2022] Open
Abstract
Background Apparently balanced chromosome rearrangements (ABCRs) in non-affected individuals are well-known to possess high reproductive risks such as infertility, abnormal offspring, and pregnancy loss. However, caution should be exercised in genetic counseling and reproductive intervention because cryptic unbalanced defects and genome structural variations beyond the resolution of routine cytogenetics may not be detected. Case presentation Here, we studied two familial cases of ABCRs were recruited in this study. In family 1, the couple suffered two abortions pregnancies and underwent labor induction. Single nucleotide polymorphism (SNP) array analysis of the aborted sample from the second pregnancy revealed a 10.8 Mb heterozygous deletion at 10q26.13q26.3 and a 5.5 Mb duplication at 19q13.41-q13.43. The non-affected father was identified as a carrier of three-way complex chromosomal rearrangement [t (6;10;19)(p22;q26;q13)] by karyotyping. Whole-genome mate-pair sequencing revealed a cryptic breakpoint on the derivative chromosome 19 (der19), indicating that the karyotype was a more complex structural rearrangement comprising four breakpoints. Three genes, FAM24B, CACNG8, and KIAA0556, were disrupted without causing any abnormal phenotype in the carrier. In family 2, the couple suffered from a spontaneous miscarriage. This family had an affected child with multiple congenital deformities and an unbalanced karyotype, 46,XY,der (11) t (6;11)(q13;p11.2). The female partner was identified as a balanced translocation carrier with the karyotype 46,XX,t (6;11)(q13;p11.2) dn. Further SNP array and fluorescent in situ hybridization (FISH) indicated a cryptic insertion between chromosome 6 and chromosome 11. Finally, whole-genome mate-pair sequencing revealed an extremely complex genomic structural variation, including a cryptic deletion and 12 breakpoints on chromosome 11, and 1 breakpoint on chromosome 6 . Conclusions Our study investigated two rare cases of ABCRs and demonstrated the efficacy of whole-genome mate-pair sequencing in analyzing the genome complex structural variation. In case of ABCRs detected by conventional cytogenetic techniques, whole genome sequencing (WGS) based approaches should be considered for accurate diagnosis, effective genetic counseling, and correct reproductive intervention to avoid recurrence risks.
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