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Vitetta G, Desiderio L, Baccolini I, Uliana V, Lanzoni G, Ghi T, Pilu G, Ambrosini E, Caggiati P, Barili V, Trotta AC, Liuti MR, Malpezzi E, Pittalis MC, Percesepe A. Mosaic derivative chromosomes at chorionic villi (CV) sampling are expression of genomic instability and precursors of cryptic disease-causing rearrangements: report of further four cases. Mol Cytogenet 2024; 17:8. [PMID: 38589928 PMCID: PMC11003029 DOI: 10.1186/s13039-024-00675-3] [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: 12/11/2023] [Accepted: 03/12/2024] [Indexed: 04/10/2024] Open
Abstract
Mosaic chromosomal anomalies arising in the product of conception and the final fetal chromosomal arrangement are expression of complex biological mechanisms. The rescue of unbalanced chromosome with selection of the most viable cell line/s in the embryo and the unfavourable imbalances in placental tissues was documented in our previous paper and in the literature. We report four additional cases with mosaic derivative chromosomes in different feto-placental tissues, further showing the instability of an intermediate gross imbalance as a frequent mechanism of de novo cryptic deletions and duplications. In conclusion we underline how the extensive remodeling of unbalanced chromosomes in placental tissues represents the 'backstage' of de novo structural rearrangements, as the early phases of a long selection process that the genome undergo during embryogenesis.
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Affiliation(s)
- Giulia Vitetta
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Laura Desiderio
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Ilaria Baccolini
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Vera Uliana
- Medical Genetics Unit, University Hospital of Parma, Parma, Italy
| | - Giulia Lanzoni
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Tullio Ghi
- Obstetrics & Gynecology, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | - Gianluigi Pilu
- Obstetric Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Enrico Ambrosini
- Medical Genetics Unit, University Hospital of Parma, Parma, Italy
| | | | - Valeria Barili
- Medical Genetics, Department of Medicine and Surgery, University of Parma, Parma, Italy
| | | | | | - Elisabetta Malpezzi
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Maria Carla Pittalis
- Medical Genetics Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy.
| | - Antonio Percesepe
- Medical Genetics Unit, University Hospital of Parma, Parma, Italy
- Medical Genetics, Department of Medicine and Surgery, University of Parma, Parma, Italy
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2
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Hasnain A, Thompson LL, Hoppman NL, Hovanes K, Liu J, Hashemi B. Constitutional Chromothripsis on Chromosome 2: A Rare Case with Severe Presentation. Case Rep Genet 2024; 2024:6319030. [PMID: 38322183 PMCID: PMC10846923 DOI: 10.1155/2024/6319030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Revised: 01/16/2024] [Accepted: 01/18/2024] [Indexed: 02/08/2024] Open
Abstract
Chromothripsis is characterized by shattering and subsequent reassembly of chromosomes by DNA repair processes, which can give rise to a variety of congenital abnormalities and cancer. Constitutional chromothripsis is a rare occurrence, reported in children presenting with a wide range of birth defects. We present a case of a female child born with multiple major congenital abnormalities including severe microcephaly, ocular dysgenesis, heart defect, and imperforate anus. Chromosomal microarray and mate pair sequencing identified a complex chromosomal rearrangement involving the terminal end of the long arm of chromosome 2, with two duplications (located at 2p25.3-p25.1 and 2q35-q37.2 regions) and two deletions (located at 2q37.2-q37.3 and 2q37.3 regions) along with structural changes including inverted segments. A review of the literature for complex rearrangements on chromosome 2 revealed overlapping features; however, our patient had a significantly more severe phenotype which resulted in early death at the age of 2 years. Breakpoints analysis did not reveal the involvement of any candidate genes. We concluded that the complexity of the genomic rearrangement and the combined dosage/structural effect of these copy number variants are likely explanations for the severe presentation in our patient.
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Affiliation(s)
- Afia Hasnain
- Genomics Laboratory, Diagnostic Services, Shared Health, Winnipeg, MB, Canada
| | - Laura L. Thompson
- Division of Laboratory Genetics and Genomics, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | - Nicole L. Hoppman
- Division of Laboratory Genetics and Genomics, Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, USA
| | | | - Jing Liu
- Genomics Laboratory, Diagnostic Services, Shared Health, Winnipeg, MB, Canada
| | - Bita Hashemi
- Genetics and Metabolism Program, Shared Health, Winnipeg, MB, Canada
- Department of Pediatrics, Division of Genetics and Metabolism, Saskatchewan Health Authority, Saskatoon, SK, Canada
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3
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Arya P, Hodge JC, Matlock PA, Vance GH, Breman AM. Two Patients with Complex Rearrangements Suggestive of Germline Chromoanagenesis. Cytogenet Genome Res 2021; 160:671-679. [PMID: 33535208 DOI: 10.1159/000512898] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 11/09/2020] [Indexed: 11/19/2022] Open
Abstract
Chromoanagenesis, a phenomenon characterized by complex chromosomal rearrangement and reorganization events localized to a limited number of genomic regions, includes the subcategories chromothripsis, chromoanasynthesis, and chromoplexy. Although definitions of these terms are evolving, constitutional chromoanagenesis events have been reported in a limited number of patients with variable phenotypes. We report on 2 cases with complex genomic events characterized by multiple copy number gains and losses confined to a single chromosome region, which are suggestive of constitutional chromoanagenesis. Case 1 is a 43-year-old male with intellectual disability and recently developed generalized tonic-clonic seizures. Chromosomal microarray analysis identified a complex rearrangement involving chromosome region 14q31.1q32.2, consisting of 16 breakpoints ranging in size from 0.2 to 6.2 Mb, with 5 segments of normal copy number present between these alterations. Interestingly, this case represents the oldest known patient with a complex rearrangement indicative of constitutional chromoanagenesis. Case 2 is a 2-year-old female with developmental delay, speech delay, low muscle tone, and seizures. Chromosomal microarray analysis identified a complex rearrangement consisting of 28 breakpoints localized to 18q21.32q23. The size of the copy number alterations ranged from 0.042 to 5.1 Mb, flanked by 12 small segments of normal copy number. These cases add to a growing body of literature demonstrating complex chromosomal rearrangements as a disease mechanism for congenital anomalies.
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Affiliation(s)
- Priyanka Arya
- IU Genetic Testing Laboratories, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Jennelle C Hodge
- IU Genetic Testing Laboratories, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Peggy A Matlock
- IU Genetic Testing Laboratories, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Gail H Vance
- IU Genetic Testing Laboratories, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Amy M Breman
- IU Genetic Testing Laboratories, Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA,
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4
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Koltsova AS, Pendina AA, Efimova OA, Chiryaeva OG, Kuznetzova TV, Baranov VS. On the Complexity of Mechanisms and Consequences of Chromothripsis: An Update. Front Genet 2019; 10:393. [PMID: 31114609 PMCID: PMC6503150 DOI: 10.3389/fgene.2019.00393] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2019] [Accepted: 04/11/2019] [Indexed: 12/28/2022] Open
Abstract
In the present review, we focus on the phenomenon of chromothripsis, a new type of complex chromosomal rearrangements. We discuss the challenges of chromothripsis detection and its distinction from other chromoanagenesis events. Along with already known causes and mechanisms, we introduce aberrant epigenetic regulation as a possible pathway to chromothripsis. We address the issue of chromothripsis characteristics in cancers and benign tumours, as well as chromothripsis inheritance in cases of its occurrence in germ cells, zygotes and early embryos. Summarising the presented data on different phenotypic effect of chromothripsis, we assume that its consequences are most likely determined not by the chromosome shattering and reassembly themselves, but by the genome regions involved in the rearrangement.
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Affiliation(s)
- Alla S Koltsova
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia.,Department of Genetics and Biotechnology, Saint Petersburg State University, Saint Petersburg, Russia
| | - Anna A Pendina
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia
| | - Olga A Efimova
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia
| | - Olga G Chiryaeva
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia
| | - Tatyana V Kuznetzova
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia
| | - Vladislav S Baranov
- D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Saint Petersburg, Russia.,Department of Genetics and Biotechnology, Saint Petersburg State University, Saint Petersburg, Russia
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Hu L, Wei Y, Luo K, Xie P, Gong F, Xiong B, Tan Y, Lu G, Lin G. Clinical outcomes in carriers of complex chromosomal rearrangements: a retrospective analysis of comprehensive chromosome screening results in seven cases. Fertil Steril 2018; 109:486-492. [DOI: 10.1016/j.fertnstert.2017.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 10/05/2017] [Accepted: 11/16/2017] [Indexed: 11/26/2022]
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