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Afifi HH, El-Kamah GY, Kamel AK, Abd Allah SG, Hammad S, Sayed-Ahmed MM, Hussein SH, Mohamed AM. Clinical and Cytogenomic Characterization of De Novo 11p14.3-p15.5 Duplication Associated with 18q23 Deletion in an Egyptian Female Infant. J Pediatr Genet 2021; 10:131-138. [PMID: 33996184 DOI: 10.1055/s-0040-1708554] [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: 11/10/2019] [Accepted: 02/17/2020] [Indexed: 10/24/2022]
Abstract
Paternal microduplication of 11p14.3-p15.5 causes the clinical manifestations of Beckwith-Wiedemann syndrome (BWS), while microdeletion of 18q23-ter is clinically characterized by short stature, congenital malformations, and developmental delay. We describe a 15-month-old girl presenting with protruding tongue, dysmorphic facial features, moderate developmental delay, umbilical hernia, hypotonia, mild-to-moderate pulmonary hypertension, small patent ductus arteriosus, and mild ventricular septal hypertrophy. Brain magnetic resonance imaging showed mild atrophic changes. Chromosomal analysis revealed 46, XX, add(18)(q23). Fluorescence in situ hybridization using subtelomere 18q and whole chromosome painting 18 showed subtelomere deletion in 18q, and the add segment was not derived from chromosome 18. Microarray-based comparative genomic hybridization detected a 22 Mb duplication of chromosome 11p15.5p14.3 and a 3.7 Mb deletion of chromosome 18q23. The phenotype of the chromosomal rearrangements is probably resulted from a combination of dosage-sensitive genes. Our patient had clinical manifestations of both 18q deletion and BWS.
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Affiliation(s)
- Hanan H Afifi
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Ghada Y El-Kamah
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Alaa K Kamel
- Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Sally G Abd Allah
- Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Sayda Hammad
- Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Mohammed M Sayed-Ahmed
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Shymaa H Hussein
- Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
| | - Amal M Mohamed
- Human Cytogenetics Department, Human Genetics and Genome Research Division, National Research Centre, Cairo, Egypt
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Ou Z, Stankiewicz P, Xia Z, Breman AM, Dawson B, Wiszniewska J, Szafranski P, Cooper ML, Rao M, Shao L, South ST, Coleman K, Fernhoff PM, Deray MJ, Rosengren S, Roeder ER, Enciso VB, Chinault AC, Patel A, Kang SHL, Shaw CA, Lupski JR, Cheung SW. Observation and prediction of recurrent human translocations mediated by NAHR between nonhomologous chromosomes. Genome Res 2011; 21:33-46. [PMID: 21205869 PMCID: PMC3012924 DOI: 10.1101/gr.111609.110] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2010] [Accepted: 10/06/2010] [Indexed: 11/24/2022]
Abstract
Four unrelated families with the same unbalanced translocation der(4)t(4;11)(p16.2;p15.4) were analyzed. Both of the breakpoint regions in 4p16.2 and 11p15.4 were narrowed to large ∼359-kb and ∼215-kb low-copy repeat (LCR) clusters, respectively, by aCGH and SNP array analyses. DNA sequencing enabled mapping the breakpoints of one translocation to 24 bp within interchromosomal paralogous LCRs of ∼130 kb in length and 94.7% DNA sequence identity located in olfactory receptor gene clusters, indicating nonallelic homologous recombination (NAHR) as the mechanism for translocation formation. To investigate the potential involvement of interchromosomal LCRs in recurrent chromosomal translocation formation, we performed computational genome-wide analyses and identified 1143 interchromosomal LCR substrate pairs, >5 kb in size and sharing >94% sequence identity that can potentially mediate chromosomal translocations. Additional evidence for interchromosomal NAHR mediated translocation formation was provided by sequencing the breakpoints of another recurrent translocation, der(8)t(8;12)(p23.1;p13.31). The NAHR sites were mapped within 55 bp in ∼7.8-kb paralogous subunits of 95.3% sequence identity located in the ∼579-kb (chr 8) and ∼287-kb (chr 12) LCR clusters. We demonstrate that NAHR mediates recurrent constitutional translocations t(4;11) and t(8;12) and potentially many other interchromosomal translocations throughout the human genome. Furthermore, we provide a computationally determined genome-wide "recurrent translocation map."
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Affiliation(s)
- Zhishuo Ou
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Paweł Stankiewicz
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Zhilian Xia
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Amy M. Breman
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Brian Dawson
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Joanna Wiszniewska
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Przemyslaw Szafranski
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - M. Lance Cooper
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Mitchell Rao
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Lina Shao
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Sarah T. South
- Departments of Pediatrics and Pathology, University of Utah, Salt Lake City, Utah 84112, USA
| | - Karlene Coleman
- Children's Healthcare of Atlanta, Atlanta, Georgia 30033, USA
| | | | - Marcel J. Deray
- Department of Neurology, Miami Children's Hospital, Miami, Florida 33155, USA
| | | | | | | | - A. Craig Chinault
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Ankita Patel
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Sung-Hae L. Kang
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - Chad A. Shaw
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
| | - James R. Lupski
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
- Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030, USA
- Texas Children's Hospital, Houston, Texas 77030, USA
| | - Sau W. Cheung
- Department of Molecular & Human Genetics, Baylor College of Medicine, Houston, Texas 77030, USA
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Thomas NS, Maloney V, Bryant V, Huang S, Brewer C, Lachlan K, Jacobs PA. Breakpoint mapping and haplotype analysis of three reciprocal translocations identify a novel recurrent translocation in two unrelated families: t(4;11)(p16.2;p15.4). Hum Genet 2008; 125:181-8. [PMID: 19104840 DOI: 10.1007/s00439-008-0611-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2008] [Accepted: 12/13/2008] [Indexed: 10/21/2022]
Abstract
The majority of constitutional reciprocal translocations appear to be unique rearrangements arising from independent events. However, a small number of translocations are recurrent, most significantly the t(11;22)(q23;q11). Among large series of translocations there may be multiple independently ascertained cases with the same cytogenetic breakpoints. Some of these could represent additional recurrent rearrangements, alternatively they could be identical by descent (IBD) or have subtly different breakpoints when examined under higher resolution. We have used molecular breakpoint mapping and haplotyping to determine the origin of three pairs of reciprocal constitutional translocations, each with the same cytogenetic breakpoints. FISH mapping showed one pair to have different breakpoints and thus to be distinct rearrangements. Another pair of translocations were IBD with identical breakpoint intervals and highly conserved haplotypes on the derived chromosomes. The third pair, t(4;11)(p16.2;p15.4), had the same breakpoint intervals by aCGH and fosmid mapping but had very different haplotypes, therefore they represent a novel recurrent translocation. Unlike the t(11;22)(q23;q11), the formation of the t(4;11)(p16.2;p15.4) may have involved segmental duplications and sequence homology at the breakpoints. Additional examples of recurrent translocations could be identified if the resources were available to study more translocations using the approaches described here. However, like the t(4;11)(p16.2;p15.4), such translocations are likely to be rare with the t(11;22) remaining the only common recurrent constitutional reciprocal translocation.
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Affiliation(s)
- N Simon Thomas
- Wessex Regional Genetics Laboratory, Salisbury NHS Foundation Trust, Salisbury District Hospital, Salisbury, SP2 8BJ, UK.
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