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Wang L, Dong B, Xie Y, Kang H, Wu Y. The molecular mechanisms of recombinant chromosome 18 with parental pericentric inversions and a review of the literature. J Hum Genet 2023; 68:625-634. [PMID: 37161033 DOI: 10.1038/s10038-023-01157-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2023] [Revised: 04/07/2023] [Accepted: 04/26/2023] [Indexed: 05/11/2023]
Abstract
Chromosomal rearrangements mostly result from non-allelic homologous recombination mediated by low-copy repeats (LCRs) or segmental duplications (SDs). Recent studies on recombinant chromosome 18 (rec (18)) have focused on diagnoses and clinical phenotypes. We diagnosed two cases of prenatal rec (18) and identified precise breakpoint intervals using karyotype and chromosomal microarray analyses. We analyzed the distribution characteristics of breakpoint repetitive elements to infer rearrangement mechanisms and reviewed relevant literature to identify genetic trends. Among the 12 families with 25 pregnancies analyzed, 68% rec (18), 24% spontaneous abortions, and 8% normal births were reported. In the 17 rec (18) cases, 65% presented maternal origin and 35% were paternal. Short-arm breakpoints at p11.31 were reported in 10 cases, whereas the long-arm breakpoints were located at q21.3 (6 cases) and q12 (4 cases). Breakpoints of pericentric inversions on chromosome 18 are concentrated in p11.31, q21.3, and q12 regions. Rearrangements at 18p11.31 are non-recurrent events. ALUs, LINE1s, and MIRs were enriched at the breakpoint regions (1.85 to 3.42-fold enrichment over the entire chromosome 18), while SDs and LCRs were absent. ALU subfamilies had sequence identities of 85.94% and 83.01% between two pair breakpoints. Small repetitive elements may mediate recombination-coupled DNA repair processes, facilitating rearrangements on chromosome 18. Maternal inversion carriers are more prone to abnormal recombination in prenatal families with rec (18). Recombinant chromosomes may present preferential segregation during gamete formation.
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Affiliation(s)
- 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, 611731, China.
| | - Bing Dong
- Department of Eugenics, Meishan Women and Children's Hospital, Alliance Hospital of West China Second University Hospital, Sichuan University, Meishan, 620000, 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, 611731, China
| | - Han Kang
- Prenatal Diagnosis Center, Chengdu Women's and Children's Central Hospital, School of Medicine, University of Electronic Science and Technology of China, Chengdu, 611731, China
| | - 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, 611731, China
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Gökpınar İli E, Altıner Ş, Karabulut HG. Cytogenetic, Molecular, and Phenotypic Characterization of a Patient with de novo Derivative Chromosome 18 and Review of the Literature. Cytogenet Genome Res 2019; 159:74-80. [PMID: 31658462 DOI: 10.1159/000503574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2019] [Indexed: 11/19/2022] Open
Abstract
We present a patient with a de novo derivative chromosome 18 which includes a terminal deletion of 18p and a terminal duplication of 18q accompanied by a cryptic duplication of 18p. The girl had mild dysmorphic features such as micro-retrognathia, upslanted palpebral fissures, bilateral epicanthus, high palate, low-set ears, short neck, and full cheeks. She also had an H-type tracheoesophageal fistula which required surgery. Her cognitive and motor skills were delayed. Karyotype analysis showed an additional segment on the short arm of chromosome 18. Chromosomal microarray revealed a 7.3-Mb terminal loss from 18p11.32 to 18p11.23, a 22.2-Mb terminal gain from 18q21.31 to 18q23, and a 3.9-Mb interstitial gain from 18p11.22 to 18p11.21. We hypothesize that the mother has gonadal mosaicism for normal chromosome 18, der(18)dup(p11.22p11.21), and der(18)dup(p11. 22p11.21)inv(18)(p11.22q21.31), or both the terminal del/dup and the interstitial duplication occurred simultaneously.
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Mohammadzadeh A, Akbaroghli S, Aghaei-Moghadam E, Mahdieh N, Badv RS, Jamali P, Kariminejad R, Chavoshzadeh Z, Ghasemi Firouzabadi S, Mansour Ghanaie R, Nozari A, Banihashemi S, Hadipour F, Hadipour Z, Kariminejad A, Najmabadi H, Shafeghati Y, Behjati F. Investigation of Chromosomal Abnormalities and Microdeletion/ Microduplication(s) in Fifty Iranian Patients with Multiple Congenital Anomalies. CELL JOURNAL 2019; 21:337-349. [PMID: 31210441 PMCID: PMC6582423 DOI: 10.22074/cellj.2019.6053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Accepted: 10/21/2018] [Indexed: 11/24/2022]
Abstract
Objective Major birth defects are inborn structural or functional anomalies with long-term disability and adverse
impacts on individuals, families, health-care systems, and societies. Approximately 20% of birth defects are due
to chromosomal and genetic conditions. Inspired by the fact that neonatal deaths are caused by birth defects in
about 20 and 10% of cases in Iran and worldwide respectively, we conducted the present study to unravel the role
of chromosome abnormalities, including microdeletion/microduplication(s), in multiple congenital abnormalities
in a number of Iranian patients.
Materials and Methods In this descriptive cross-sectional study, 50 sporadic patients with Multiple Congenital
Anomalies (MCA) were selected. The techniques employed included conventional karyotyping, fluorescence in
situ hybridization (FISH), multiplex ligation-dependent probe amplification (MLPA), and array comparative genomic
hybridisation (array-CGH), according to the clinical diagnosis for each patient.
Results Chromosomal abnormalities and microdeletion/microduplication(s) were observed in eight out of fifty patients
(16%). The abnormalities proved to result from the imbalances in chromosomes 1, 3, 12, and 18 in four of the patients.
However, the other four patients were diagnosed to suffer from the known microdeletions of 22q11.21, 16p13.3, 5q35.3,
and 7q11.23.
Conclusion In the present study, we report a patient with 46,XY, der(18)[12]/46,XY, der(18), +mar[8] dn presented
with MCA associated with hypogammaglobulinemia. Given the patient’s seemingly rare and highly complex
chromosomal abnormality and the lack of any concise mechanism presented in the literature to justify the case,
we hereby propose a novel mechanism for the formation of both derivative and ring chromosome 18. In addition,
we introduce a new 12q abnormality and a novel association of an Xp22.33 duplication with 1q43q44 deletion
syndrome. The phenotype analysis of the patients with chromosome abnormality would be beneficial for further
phenotype-genotype correlation studies.
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Affiliation(s)
- Akbar Mohammadzadeh
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Susan Akbaroghli
- Pediatric Neurology Research Center, Mofid Children's Hospital, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Clinical Genetics Division, Mofid Children's Hospital, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ehsan Aghaei-Moghadam
- Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Nejat Mahdieh
- Cardiogenetic Research Laboratory, Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Reza Shervin Badv
- Children's Medical Center, Pediatrics Center of Excellence, Tehran University of Medical Sciences, Tehran, Iran
| | - Payman Jamali
- Genetic Counseling Center, Shahroud Welfare Organization, Shahroud, Iran
| | | | - Zahra Chavoshzadeh
- Department of Immunology and Allergy, Mofid Children's Hospital, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.,Pediatric Infections Research Center, Research Institute for Children's Health, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | | | - Roxana Mansour Ghanaie
- Pediatric Infections Research Center, Research Institute for Children's Health, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ahoura Nozari
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Sussan Banihashemi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran
| | - Fatemeh Hadipour
- Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.,Sarem Cell Research Center (SCRC), Sarem Women's Hospital, Tehran, Iran
| | - Zahra Hadipour
- Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.,Sarem Cell Research Center (SCRC), Sarem Women's Hospital, Tehran, Iran
| | | | - Hossein Najmabadi
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.,Kariminejad-Najmabadi Pathology and Genetics Center, Tehran, Iran
| | - Yousef Shafeghati
- Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.,Sarem Cell Research Center (SCRC), Sarem Women's Hospital, Tehran, Iran
| | - Farkhondeh Behjati
- Genetics Research Center, University of Social Welfare and Rehabilitation Sciences, Tehran, Iran.Electronic Address: .,Sarem Fertility and Infertility Research Center (SAFIR), Sarem Women's Hospital, Tehran, Iran.,Sarem Cell Research Center (SCRC), Sarem Women's Hospital, Tehran, Iran
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Poterico JA, Vásquez F, Chávez-Pastor M, Trubnykova M, Chavesta F, Chirinos J, Salcedo N, Mena R, Cubas S, González R, Alvariño R, Abarca-Barriga H. A Peruvian Child with 18p-/18q+ Syndrome and Persistent Microscopic Hematuria. J Pediatr Genet 2017; 6:258-266. [PMID: 29142771 DOI: 10.1055/s-0037-1604099] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Accepted: 06/01/2017] [Indexed: 12/30/2022]
Abstract
Chromosome 18 pericentric inversion carriers could have offspring with recombinant chromosomes, leading to patients with clinical variable manifestations. Patients with 18p-/18q+ rearrangements share some clinical characteristics, while other characteristics differ. Factors for such divergence include the length of the inverted segment, among others. Here, we describe a Peruvian child with dysmorphic features, intellectual disability persistent microscopic hematuria, aortic pseudocoarctation, and descending aorta arteritis, among others. Karyotype analysis of family members determined the mother as the carrier of a pericentric inversion: 18[inv(18)(p11.2q21.3)]. This child carries a recombinant chromosome 18, with chromosomal microarray analysis detecting two genomic imbalances in patient's chromosome 18: one duplicated region and one deleted segment in the large and the short arms, respectively. Persistent microscopic hematuria has not been reported among 18p-/18q+ phenotypes. Our patient elucidates that other factors play significant and yet unknown roles for not fulfilling the proposed genotype-phenotype correlation associated with hemizygosity in this type of recombinant chromosome 18 or presenting these features as the patient ages.
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Affiliation(s)
- Julio A Poterico
- Department of Pathology, Instituto Nacional de Enfermedades Neoplásicas, Lima, Perú
| | - Flor Vásquez
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Miguel Chávez-Pastor
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú.,Faculty of Human Medicine Alberto Hurtado, Universidad Peruana Cayetano Heredia, Lima, Perú
| | - Milana Trubnykova
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Félix Chavesta
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Jenny Chirinos
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Nancy Salcedo
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Rosmery Mena
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Sulema Cubas
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Rocío González
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Rossana Alvariño
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú
| | - Hugo Abarca-Barriga
- Department of Genetic & Inborn Error Metabolism, Instituto Nacional de Salud del Niño, Breña, Lima, Perú.,Postgraduate Program at Odontopediatrics, Universidad Científica del Sur, Lima, Perú
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