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Manotas MC, García-Acero M, González DM, Moreno OM, Suárez-Obando F, Céspedes C, Forero C, Pérez J, Fernández N, Rojas A. Clinical and Molecular Cytogenetic Characteristics of Five Cases with Isodicentric Y Chromosome. Sex Dev 2021; 14:12-20. [PMID: 33677455 DOI: 10.1159/000512803] [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: 04/30/2020] [Accepted: 10/01/2020] [Indexed: 11/19/2022] Open
Abstract
Isodicentric Y chromosome [idic(Y)] is one of the most common structural abnormalities of the Y chromosome and has been observed in patients with reproductive disorders and in patients with disorders of sexual development. Most idic(Y) chromosomes are found in mosaic form with a 45,X cell line. These chromosomes are highly unstable during mitosis due to the presence of 2 centromers, which explains their probable loss in early mitosis or mitosis of the embryo and therefore the presence of the 45,X line. It has been hypothesized that the proportion of 45,X cells in various tissues probably influences the phenotypic sex of individuals carrying an idic(Y) chromosome, ranging from infertile men, hypospadias, ambiguous genitalia, and Turner syndrome to sex reversal. In this article we present 5 cases of patients with idic(Y) referred for suspected disorder of sex development (DSD), 3 with a male assignment and 2 with a female assignment. All cases have variable clinical characteristics, which were assessed by the transdisciplinary group of Disorders of Sex Development of the Hospital Universitario San Ignacio, Bogotá, Colombia. Patients were analyzed by conventional and molecular cytogenetics using high-resolution G-band and FISH techniques. Our findings highlight the importance of cytogenetic studies in the diagnosis of DSD patients.
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Affiliation(s)
- María C Manotas
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Mary García-Acero
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Daniel M González
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Olga M Moreno
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Fernando Suárez-Obando
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia.,Clinical Genetics, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Camila Céspedes
- School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia.,Pediactric Endocrinology, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Catalina Forero
- School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia.,Pediactric Endocrinology, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Jaime Pérez
- School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia.,Division of Urology, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Nicolás Fernández
- School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia.,Division of Urology, Hospital Universitario San Ignacio, Pontificia Universidad Javeriana, Bogotá, Colombia
| | - Adriana Rojas
- Institute of Human Genetics, School of Medicine, Pontificia Universidad Javeriana, Bogotá, Colombia,
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Yang Y, Hao W. Clinical, cytogenetic, and molecular findings of isodicentric Y chromosomes. Mol Cytogenet 2019; 12:55. [PMID: 31890035 PMCID: PMC6935080 DOI: 10.1186/s13039-019-0465-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 12/11/2019] [Indexed: 01/29/2023] Open
Abstract
Background Isodicentric Y chromosomes [idic(Y)] are one of the most common structural abnormalities of the Y chromosome. The prenatal diagnosis of isodicentric Y chromosomes is of vital importance, and the postnatal phenotypes vary widely. Therefore, we present six patients prenatally diagnosed with isodicentric Y chromosomes and review the literature concerning the genotype-phenotype correlations. Method The clinical materials of six patients were obtained. Cytogenetic and molecular approaches were carried out for these six patients. Results Isodicentric Y chromosomes were found in all sixpatients. Among them, four patients presented with a mosaic 45,X karyotype, one patient had a 46,XY cell line, and one patient was nonmosaic. Five of these six isodicentric Y chromosomes had a breakpoint in Yq11.2, and the other had a breakpoint in Yp11.3. The molecular analysis demonstrated different duplications and deletions of the Y chromosome. Finally, three patients chose to terminate the pregnancy, two patients gave birth to normal-appearing males, and one patient was lost to follow-up. Conclusion The incorporation of multiple cytogenetic and molecular techniques would offer a more comprehensive understanding of this structural chromosomal abnormality for genetic counselling.
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Affiliation(s)
- Yang Yang
- Prenatal Diagnosis Center, Hangzhou Maternity and Child Care Hospital, #369 Kunpeng Road, Shangcheng District, Hangzhou, 310008 Zhejiang China
| | - Wang Hao
- Prenatal Diagnosis Center, Hangzhou Maternity and Child Care Hospital, #369 Kunpeng Road, Shangcheng District, Hangzhou, 310008 Zhejiang China.,2Department of Cell Biology and Medical Genetics, School of Medicine, Zhejiang University, Hangzhou, Zhejiang China
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Délot EC, Papp JC, Sandberg DE, Vilain E. Genetics of Disorders of Sex Development: The DSD-TRN Experience. Endocrinol Metab Clin North Am 2017; 46:519-537. [PMID: 28476235 PMCID: PMC5714504 DOI: 10.1016/j.ecl.2017.01.015] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Although many next-generation sequencing platforms are being created around the world, implementation is facing multiple hurdles. A strong hurdle to the full adherence of clinical teams to the Disorders of Sex Development Translational Research Network (DSD-TRN) guidelines for standardization of reporting and practice is the current lack of integration of the standardized clinical forms into the various electronic medical records at different sites. Time allocated to research is also limited. In spite of these hurdles, genetic information for half the enrolled patients is already available in the DSD-TRN registry, and early results demonstrate the value of such an infrastructure.
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Affiliation(s)
- Emmanuèle C Délot
- Departments of Human Genetics and Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, Room 5301A, 695 Charles East Young Drive South, Los Angeles, CA 90095, USA.
| | - Jeanette C Papp
- Department of Human Genetics, David Geffen School of Medicine, University of California, Los Angeles, Room 5506, 695 Charles East Young Drive South, Los Angeles, CA 90095, USA
| | - David E Sandberg
- Division of Pediatric Psychology, Department of Pediatrics & Communicable Diseases and the Child Health Evaluation and Research Center, University of Michigan Medical School, 1500 East Medical Center Drive, Ann Arbor, MI 48109, USA
| | - Eric Vilain
- Departments of Human Genetics, Urology, and Pediatrics, David Geffen School of Medicine, University of California, Los Angeles, Room 4554B, 695 Charles East Young Drive South, Los Angeles, CA 90095, USA
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