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Li S, Li H, Gao Y, Zou Y, Yin X, Chen ZJ, Choy KW, Dong Z, Yan J. Identification of cryptic balanced translocations in couples with unexplained recurrent pregnancy loss based upon embryonic PGT-A results. J Assist Reprod Genet 2024; 41:171-184. [PMID: 38102500 PMCID: PMC10789697 DOI: 10.1007/s10815-023-02999-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2023] [Accepted: 11/27/2023] [Indexed: 12/17/2023] Open
Abstract
PURPOSE The goal of this study is to determine whether any balanced translocation (BT) had been missed by previous karyotyping in patients with unexplained recurrent pregnancy loss (uRPL). METHODS This case series included 48 uRPL-affected couples with normal karyotypes. The embryos from these couples have all undergone preimplantation testing for aneuploidies (PGT-A). Based on the PGT-A's results, 48 couples could be categorized into two groups: 17 couples whose multiple embryos were detected with similar structural variations (SVs, segmental/complete) and 31 couples without such findings but who did not develop any euploid embryo despite at least three high-quality blastocysts being tested. The peripheral blood sample of each partner was then collected for mate-pair sequencing (MPseq) to determine whether any of them were BT carriers. RESULTS MPseq analyses identified 13 BTs in the 17 couples whose multiple embryos had similar SVs detected (13/17, 76.47%) and three BTs in the 31 couples without euploid embryo obtained (3/31, 9.7%). Among the 16 MPseq-identified BTs, six were missed due to the limited resolution of G-banding karyotyping analysis, and the rest were mostly owing to the similar banding patterns and/or comparable sizes shared by the two segments exchanged. CONCLUSION A normal karyotype does not eliminate the possibility of carrying BT for couples with uRPL. The use of PGT-A allows us to perceive the "carrier couples" missed by karyotyping analysis, providing an increased risk of finding cryptic BTs if similar SVs are always detected on two chromosomes among multiple embryos. Nonetheless, certain carriers with translocated segments of sub-resolution may still go unnoticed.
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Affiliation(s)
- Shuo Li
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Hongchang Li
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Yuan Gao
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Yang Zou
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Xunqiang Yin
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
| | - Zi-Jiang Chen
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China
- Shanghai Key Laboratory for Assisted Reproduction and Reproductive Genetics, Shanghai Jiao Tong University, Shanghai, China
- Center for Reproductive Medicine, Ren Ji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Kwong Wai Choy
- Department of Obstetrics & Gynecology, The Chinese University of Hong Kong, Hong Kong, China.
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.
- The Chinese University of Hong Kong-Baylor College of Medicine Joint Center For Medical Genetics, Hong Kong, China.
- Hong Kong Branches of Chinese National Engineering Research Centers-Center for Assisted Reproductive Technology and Reproductive Genetics, Hong Kong, China.
| | - Zirui Dong
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China.
- Department of Obstetrics & Gynecology, The Chinese University of Hong Kong, Hong Kong, China.
- Shenzhen Research Institute, The Chinese University of Hong Kong, Shenzhen, China.
| | - Junhao Yan
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China.
- Key Laboratory of Reproductive Endocrinology of Ministry of Education, Shandong University, Jinan, China.
- Shandong Key Laboratory of Reproductive Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, China.
- Shandong Provincial Clinical Research Center for Reproductive Health, Shandong University, Jinan, China.
- National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong University, Jinan, China.
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Coton J, Labalme A, Till M, Bussy G, Krifi Papoz S, Lesca G, Heron D, Sanlaville D, Edery P, des Portes V, Rossi M. Characterization of two familial cases presenting with a syndromic specific learning disorder and carrying (17q;21q) unbalanced translocations. Clin Case Rep 2018; 6:827-834. [PMID: 29744066 PMCID: PMC5930267 DOI: 10.1002/ccr3.1450] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Revised: 01/19/2018] [Accepted: 02/05/2018] [Indexed: 11/08/2022] Open
Abstract
Chromosomal microarray (CMA) can detect pathogenic copy number variations in 15–20% of individuals with intellectual disability and in 10% of patients with autism spectrum disorders. The diagnostic rate in specific learning disorders (SLD) is unknown. Our study emphasizes the usefulness of CMA in the diagnostic workout assessment of familial SLD.
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Affiliation(s)
- Julie Coton
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
| | - Audrey Labalme
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
| | - Marianne Till
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
| | - Gerald Bussy
- Service de Neuropédiatrie; Hospices Civils de Lyon; Bron France
- Service de Génétique; CHU de Saint Etienne; Saint Etienne France
| | | | - Gaetan Lesca
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
- Centre de Recherche en Neurosciences de Lyon; INSERM U1028 CNRS UMR5292, GENDEV Team; Bron France
| | - Delphine Heron
- Département de Génétique et Centre de Référence « Déficiences intellectuelles de causes rares »; AP-HP, Groupe Hospitalier Pitié-Salpêtrière et GRC-Génétique des Déficiences Intellectuelles de Causes rares; Université Pierre et Marie Curie; F-75013 Paris France
| | - Damien Sanlaville
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
- Centre de Recherche en Neurosciences de Lyon; INSERM U1028 CNRS UMR5292, GENDEV Team; Bron France
| | - Patrick Edery
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
- Centre de Recherche en Neurosciences de Lyon; INSERM U1028 CNRS UMR5292, GENDEV Team; Bron France
| | | | - Massimiliano Rossi
- Centre de référence des anomalies du développement; Service de Génétique; Hospices Civils de Lyon; Bron France
- Centre de Recherche en Neurosciences de Lyon; INSERM U1028 CNRS UMR5292, GENDEV Team; Bron France
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3
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Sharma P, Gupta N, Chowdhury MR, Sapra S, Ghosh M, Gulati S, Kabra M. Application of chromosomal microarrays in the evaluation of intellectual disability/global developmental delay patients – A study from a tertiary care genetic centre in India. Gene 2016; 590:109-19. [DOI: 10.1016/j.gene.2016.06.020] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 06/07/2016] [Accepted: 06/08/2016] [Indexed: 01/21/2023]
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4
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Probst FJ, James RA, Burrage LC, Rosenfeld JA, Bohan TP, Ward Melver CH, Magoulas P, Austin E, Franklin AIA, Azamian M, Xia F, Patel A, Bi W, Bacino C, Belmont JW, Ware SM, Shaw C, Cheung SW, Lalani SR. De novo deletions and duplications of 17q25.3 cause susceptibility to cardiovascular malformations. Orphanet J Rare Dis 2015; 10:75. [PMID: 26070612 PMCID: PMC4472615 DOI: 10.1186/s13023-015-0291-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Accepted: 06/02/2015] [Indexed: 01/28/2023] Open
Abstract
Background Genomic disorders resulting from deletion or duplication of genomic segments are known to be an important cause of cardiovascular malformations (CVMs). In our previous study, we identified a unique individual with a de novo 17q25.3 deletion from a study of 714 individuals with CVM. Methods To understand the contribution of this locus to cardiac malformations, we reviewed the data on 60,000 samples submitted for array comparative genomic hybridization (CGH) studies to Medical Genetics Laboratories at Baylor College of Medicine, and ascertained seven individuals with segmental aneusomy of 17q25. We validated our findings by studying another individual with a de novo submicroscopic deletion of this region from Cytogenetics Laboratory at Cincinnati Children’s Hospital. Using bioinformatic analyses including protein-protein interaction network, human tissue expression patterns, haploinsufficiency scores, and other annotation systems, including a training set of 251 genes known to be linked to human cardiac disease, we constructed a pathogenicity score for cardiac phenotype for each of the 57 genes within the terminal 2.0 Mb of 17q25.3. Results We found relatively high penetrance of cardiovascular defects (~60 %) with five deletions and three duplications, observed in eight unrelated individuals. Distinct cardiac phenotypes were present in four of these subjects with non-recurrent de novo deletions (range 0.08 Mb–1.4 Mb) in the subtelomeric region of 17q25.3. These included coarctation of the aorta (CoA), total anomalous pulmonary venous return (TAPVR), ventricular septal defect (VSD) and atrial septal defect (ASD). Amongst the three individuals with variable size duplications of this region, one had patent ductus arteriosus (PDA) at 8 months of age. Conclusion The distinct cardiac lesions observed in the affected patients and the bioinformatics analyses suggest that multiple genes may be plausible drivers of the cardiac phenotype within this gene-rich critical interval of 17q25.3. Electronic supplementary material The online version of this article (doi:10.1186/s13023-015-0291-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- F J Probst
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - R A James
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - L C Burrage
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - J A Rosenfeld
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - T P Bohan
- Department of Neurology, Memorial Hermann Texas Medical Center, Houston, TX, USA
| | - C H Ward Melver
- Genetic Center, Children's Hospital Medical Center Of Akron, Akron, OH, USA
| | - P Magoulas
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - E Austin
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - A I A Franklin
- Department of Developmental Pediatrics, Texas Children's Hospital, Houston, TX, USA
| | - M Azamian
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - F Xia
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - A Patel
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - W Bi
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - C Bacino
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - J W Belmont
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - S M Ware
- Departments of Pediatrics and Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, IN, USA
| | - C Shaw
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - S W Cheung
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA
| | - S R Lalani
- Department of Molecular and Human Genetics, Baylor College of Medicine, One Baylor Plaza, MS BCM225, Houston, TX, USA.
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Sarri C, Douzgou S, Kontos H, Anagnostopoulou K, Tümer Z, Grigoriadou M, Petersen MB, Kokotas H, Merou K, Pandelia E, Giouroukou E, Papanikolaou K, Côté GB, Gyftodimou Y. 35-Year Follow-Up of a Case of Ring Chromosome 2: Array-CGH Analysis and Literature Review of the Ring Syndrome. Cytogenet Genome Res 2015; 145:6-13. [PMID: 25997743 DOI: 10.1159/000382046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/02/2015] [Indexed: 11/19/2022] Open
Abstract
Côté et al. [1981] suggested that ring chromosomes with or without deletions share a common pattern of phenotypic anomalies, regardless of which chromosome is involved. The phenotype of this 'general ring syndrome' consists of growth failure without malformations, few or no minor anomalies, and mild to moderate mental retardation. We reconsidered the ring chromosome 2 case previously published by Côté et al. [1981], and we characterized it by array CGH, polymorphic markers as well as subtelomere MLPA and FISH analysis. A terminal deletion (q37.3qter) of maternal origin of the long arm of the ring chromosome 2 was detected and confirmed by all the above-mentioned methods. Ring chromosome 2 cases are exceedingly rare. Only 18 cases, including the present one, have been published so far, and our patient is the longest reported survivor, with a 35-year follow-up, and the third case characterized by array-CGH analysis.
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Affiliation(s)
- Catherine Sarri
- Department of Genetics, Institute of Child Health, Athens, Greece
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6
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Screening for subtle chromosomal rearrangements in an Egyptian sample of children with unexplained mental retardation. EGYPTIAN JOURNAL OF MEDICAL HUMAN GENETICS 2011. [DOI: 10.1016/j.ejmhg.2011.02.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022] Open
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Falk RE, Casas KA. Chromosome 2q37 deletion: clinical and molecular aspects. AMERICAN JOURNAL OF MEDICAL GENETICS PART C-SEMINARS IN MEDICAL GENETICS 2008; 145C:357-71. [PMID: 17910077 DOI: 10.1002/ajmg.c.30153] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Terminal deletions of chromosome 2 with breakpoints at or within band 2q37, ranging from visible abnormalities to cryptic, subtelomeric deletions, have been recognized with increasing frequency among children with mild-moderate mental retardation, characteristic facial appearance, and behavioral manifestations which often place them on the autism spectrum. The stereotypic facial characteristics include prominent forehead, thin, highly arched eyebrows, depressed nasal bridge, full cheeks, deficient nasal alae and prominent columella, thin upper lip, and various minor anomalies of the pinnae. Abnormal nipples, including inverted nipples, have been reported in a number of cases. CNS, ocular, cardiac, gastrointestinal, renal, and other GU anomalies have been noted in nearly one-third of patients. Of note, coarctation or hypoplasia of the aorta has been described in several affected children. Wilms tumor, renal dysplasia, and tracheomalacia have been reported only with the most proximal breakpoint at band 2q37.1 while a range of GI anomalies, pyloric stenosis, and diaphragmatic defects have been reported with breakpoints throughout the region. A subset of patients with the most distal deletion present phenotypic features which mimic Albright hereditary osteodystrophy (AHO). In addition to the AHO-like phenotype, later onset findings include seizures and cystic kidneys. Timely diagnosis of this recognizable syndrome provides a basis for genetic counseling, appropriate surveillance, and intervention, and avoids unnecessary and expensive diagnostic testing.
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Affiliation(s)
- Rena E Falk
- Cedars-Sinai Medical Center, Division of Medical Genetics, 8700 Beverly Blvd., SSB 387, Los Angeles, CA 90048, USA.
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9
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Kitsiou-Tzeli S, Sismani C, Ioannides M, Bashiardes S, Ketoni A, Touliatou V, Kolialexi A, Mavrou A, Kanavakis E, Patsalis PC. Array-CGH analysis and clinical description of 2q37.3 de novo subtelomeric deletion. Eur J Med Genet 2006; 50:73-8. [PMID: 17194633 DOI: 10.1016/j.ejmg.2006.09.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2006] [Accepted: 09/28/2006] [Indexed: 01/05/2023]
Abstract
We report on a 13-year-old girl with normal karyotype and a de novo cryptic terminal deletion of chromosome 2q, detected by subtelomeric FISH analysis. Further investigation with array-CGH analysis using the 1Mb resolution Spectral Chip 2600 (Spectral Genomics) confirmed the deletion and also showed a deletion of four additional clones. No other abnormalities were detected by array-CGH. FISH studies using 8 BAC-probes were performed for fine mapping of the deletion and confirmed the array results. FISH analysis showed that the deletion breakpoint lies between clones RP11-84G18 and RP11-83N2 (physical distance between clones 0.36Mb) and extends to the telomere. The size of the deletion was estimated to be about 6.4-6.7Mb. Clinical findings include: developmental delay, severe behavioural disturbances, growth-pubertal retardation, congenital conductive mild hearing loss, growth hormone deficiency, compensate hypothyroidism, dysmorphic facial features, excessive joint hypermobility, brachymetaphalangy, abnormal dermatoglyphics and a history of neonatal laryngomalacia, hypotonia and umbilical hernia. The phenotype of our patient is in keeping with those of the literature, with the exception of cardiovascular, urogenital, neurological anomalies and eczema, which were not observed. The report of the clinical and molecular presentation of similar cases will allow accurate phenotype-genotype correlation and proper genetic counseling of the family.
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Affiliation(s)
- Sofia Kitsiou-Tzeli
- Medical Genetics Laboratory, University of Athens, Choremio Research Laboratory, "Aghia Sophia" Children's Hospital, Athens, Greece
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Moeschler JB, Shevell M. Clinical genetic evaluation of the child with mental retardation or developmental delays. Pediatrics 2006; 117:2304-16. [PMID: 16740881 DOI: 10.1542/peds.2006-1006] [Citation(s) in RCA: 193] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022] Open
Abstract
This clinical report describes the clinical genetic evaluation of the child with developmental delays or mental retardation. The purpose of this report is to describe the optimal clinical genetics diagnostic evaluation to assist pediatricians in providing a medical home for children with developmental delays or mental retardation and their families. The literature supports the benefit of expert clinical judgment by a consulting clinical geneticist in the diagnostic evaluation. However, it is recognized that local factors may preclude this particular option. No single approach to the diagnostic process is supported by the literature. This report addresses the diagnostic importance of clinical history, 3-generation family history, dysmorphologic examination, neurologic examination, chromosome analysis (> or =650 bands), fragile X molecular genetic testing, fluorescence in situ hybridization studies for subtelomere chromosome rearrangements, molecular genetic testing for typical and atypical presentations of known syndromes, computed tomography and/or magnetic resonance brain imaging, and targeted studies for metabolic disorders.
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Bacino CA, Bischoff FZ, Shaffer LG. Re: Familial cryptic translocation (2;17) ascertained through recurrent spontaneous abortions: Bruyere H, Rajcan-Separovic E, Doyle J, Pantzar T, Langlois S. Am J Med Genet A 2004; 130A:439-40. [PMID: 15389713 DOI: 10.1002/ajmg.a.30219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Giardino D, Finelli P, Gottardi G, De Canal G, Della Monica M, Lonardo F, Scarano G, Larizza L. Narrowing the candidate region of Albright hereditary osteodystrophy-like syndrome by deletion mapping in a patient with an unbalanced cryptic translocation t(2;6)(q37.3;q26). Am J Med Genet A 2003; 122A:261-5. [PMID: 12966529 DOI: 10.1002/ajmg.a.20287] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
We here describe a submicroscopic translocation affecting the subtelomeric regions of chromosomes 2q and 6q identified in a patient referred to us because of mental retardation, obesity, brachydactyly, and short stature. FISH analysis using subtelomeric probes showed a 46,XY,der(2)t(2;6)(q37.3;q26) in the propositus, and a balanced t(2;6) in his father and sister. FISH with region-specific genomic clones made it possible to map the 2q37.3 breakpoint precisely to the region covered by BAC 585E12, and the 6q26 breakpoint to between the regions encompassed by 414A5 and 480A20. The 2q subtelomeric deletion has often been found in patients with Albright hereditary osteodystrophy (AHO)-like syndrome but, to the best of our knowledge, the 2q37.3-qter monosomy ascertained in our patient is the smallest so far described within the syndrome's critical interval, and may thus enhance the search for the responsible genes.
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MESH Headings
- Abnormalities, Multiple/genetics
- Abnormalities, Multiple/pathology
- Child
- Chromosome Mapping
- Chromosomes, Human, Pair 2/genetics
- Chromosomes, Human, Pair 6/genetics
- Fibrous Dysplasia, Polyostotic/pathology
- Hand Deformities, Congenital/pathology
- Humans
- In Situ Hybridization, Fluorescence
- Intellectual Disability/pathology
- Male
- Microsatellite Repeats
- Obesity/pathology
- Syndrome
- Translocation, Genetic
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Affiliation(s)
- Daniela Giardino
- Laboratorio di Citogenetica, Istituto Auxologico Italiano, Via Ariosto 13, 20145 Milan, Italy.
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Rodríguez L, Martínez Guardia N, Herens C, Jamar M, Verloes A, López F, Santos Muñoz J, Martínez-Frías ML. Subtle trisomy 12q24.3 and subtle monosomy 22q13.3: three new cases and review. Am J Med Genet A 2003; 122A:119-24. [PMID: 12955763 DOI: 10.1002/ajmg.a.20243] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
The high resolution G-bands (850 bands) karyotype have made it possible to identify small chromosome anomalies (5 megabases) which are now microscopically visible. New techniques have been improved, such as the Fluorescent in situ hybridization (FISH) with subtelomeric probes, which can be employed to detect cryptic chromosome alterations not visible microscopically. We present three cases which had been remitted for a high resolution karyotype. The high resolution G-band karyotype and the FISH techniques led us to conclude that the three cases were carriers of a similar subtle chromosomal alteration. Case I is a new born female with developmental and psychomotor delay, hypotonia, and long limbs with arachnodactily. A high resolution G-band karyotype showed an abnormal chromosome 22. FISH techniques confirmed a der(22)t(12;22)(q24.31;q13.3). Case II is a 12-year-old girl, with growth retardation, long shaped face with thick eyebrows, smooth philtrum, and thin upper lip with severe mental retardation (still no language), with a phenotype very similar to that of his sister: long shaped face, thick eyebrows, smooth philtrum, and thin upper lip. A high resolution G-band karyotype also showed in Case II and III an abnormal chromosome 22, studied by FISH techniques which confirmed a der(22)t(12;22)(q24.3;q13.3) in both cases.
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Affiliation(s)
- Laura Rodríguez
- Estudio Colaborativo Español de Malformaciones Congénitas (ECEMC) del Centro de Investigación sobre Anomalías Congénitas (CIAC), Instituto de Salud Carlos III, Ministerio de Sanidad y Consumo, Madrid, Spain.
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McKenzie LJ, Cisneros PL, Torsky S, Bacino CA, Buster JE, Carson SA, Simpson JL, Bischoff F. Preimplantation genetic diagnosis for a known cryptic translocation: follow-up clinical report and implication of segregation products. Am J Med Genet A 2003; 121A:56-9. [PMID: 12900903 DOI: 10.1002/ajmg.a.20159] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
This report describes preimplantation genetic diagnosis (PGD) of a couple with a known paternally-derived balanced cryptic translocation 46,XY.ish t(2q;17q)(210E14-,B37c1+;B37c1-,210E14+) in embryos from a couple who previously had a child with severe mental retardation and was previously described in this journal [Bacino et al., 2000]. This child inherited the unbalanced product of translocation from her father: 46,XX.ish der(2)t(2q;17q)pat(210E14-,B37c1+). The couple desired a normal offspring and sought PGD to avoid clinical pregnancy termination. They were treated three times with in vitro fertilization followed by PGD. Two sequential FISH hybridizations were performed. In the first hybridization, telomeric probes to 2q and 17q and a chromosome 17 centromere probe were employed. The second hybridization screened for maternal age-related aneuploidy (X,Y,13,18,21). Of the 18 informative embryos, only 4 (22%) were normal. The remaining 12 (67%) were abnormal; most with unbalanced products (10/12) from the paternally-derived rearrangement. The most frequent mode of segregation observed for this cryptic translocation was adjacent-1 (7/18, 39%). This suggests cryptic translocations are amenable to PGD and, as are traditional translocations, demonstrate higher frequencies of unbalanced segregants than the empiric risk of 10-15% observed at amniocentesis or chorionic villus sampling. Thus, cryptic translocations presumably behave like overt translocations, in that PGD must be performed on a relatively large number of embryos to assure even 2-3 transferable embryos.
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Affiliation(s)
- L J McKenzie
- Department of Obstetrics and Gynecology, Baylor College of Medicine, Houston, Texas 77030, USA.
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15
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Souter VL, Glass IA, Chapman DB, Raff ML, Parisi MA, Opheim KE, Disteche CM. Multiple fetal anomalies associated with subtle subtelomeric chromosomal rearrangements. ULTRASOUND IN OBSTETRICS & GYNECOLOGY : THE OFFICIAL JOURNAL OF THE INTERNATIONAL SOCIETY OF ULTRASOUND IN OBSTETRICS AND GYNECOLOGY 2003; 21:609-615. [PMID: 12808681 DOI: 10.1002/uog.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report two cases of multiple fetal anomalies detected by prenatal ultrasound and associated with subtle subtelomeric chromosomal rearrangements. The first case presented at 25 weeks of gestation with an enlarged cisterna magna and ventriculomegaly. Karyotyping of amniocytes showed a subtle terminal abnormality of chromosome 6q. Thereafter, screening of all unique chromosomal subtelomeric regions using a panel of telomere-specific, fluorescence in situ hybridization (FISH) probes revealed an unbalanced reciprocal translocation between 6q and 17p [46,XX.ish der(6)t(6;17)(q25.3;p13)(TelVysion6q-;TelVysion17p+)]. The second case presented at 25 weeks of gestation with tetralogy of Fallot and at 34 weeks of gestation had additional ultrasound findings of an arachnoid cyst and intrauterine growth restriction. Postnatal karyotyping of peripheral blood was performed and appeared normal. However, a cryptic deletion of the subtelomeric region of the long arm of chromosome 14 was identified when the infant's blood sample was used as a control for an oncology FISH probe. Thereafter, screening of all unique chromosomal subtelomeric regions using a panel of telomere-specific FISH probes revealed an unbalanced reciprocal translocation of chromosomes 14q and 20p [46,XY.ish der(14)t(14;20)(q32.3;p13)(IGH-, D14S308-,TelVysion20p+)mat]. These two cases add to a growing number of reports of cryptic subtelomeric chromosomal rearrangements associated with congenital anomalies. This is the first report of multiple, simultaneous FISH screening of the subtelomeric regions in amniotic fluid and has demonstrated the technical feasibility of this technique in the prenatal period.
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Affiliation(s)
- V L Souter
- Division of Medical Genetics, Department of Medicine, University of Washington, Seattle, WA 98105-0371, USA.
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16
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Dawson AJ, Putnam S, Schultz J, Riordan D, Prasad C, Greenberg CR, Chodirker BN, Mhanni AA, Chudley AE. Cryptic chromosome rearrangements detected by subtelomere assay in patients with mental retardation and dysmorphic features. Clin Genet 2002; 62:488-94. [PMID: 12515261 DOI: 10.1111/j.1399-0004.2002.tb02255.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
Abstract
The regions near telomeres of human chromosomes are gene rich. Chromosome subtelomere rearrangements occur with a frequency of 7-10% in children with mild-to-moderate mental retardation (MR) and approximately 50% of cases are familial. Clinical investigation of subtelomere rearrangements is now prompted by fluorescence in situ hybridization (FISH) analysis using specific DNA probes from all relevant chromosome ends. In our study, 40 children were selected for subtelomere assay using either the Chromophore Multiprobe-T Cytocell device or the VYSIS TelVision probes. Inclusion criteria were: developmental delay or MR; a normal 550 G-band karyotype; FRAXA negative; and at least one other clinical criterion. Exclusion criteria included an identified genetic or environmental diagnosis. Of the 40 patients analysed, four (10%) were found to have subtelomere rearrangements. Three of 40 (7.5%) were found to have an unbalanced subtelomere rearrangement and one of 40 (2.5%) was found to have an apparently normal variant subtelomere deletion. The first of the three with an unbalanced karyotype was the result of a familial translocation, the second was a de novo finding, and the origin of the third could not be determined. The subtelomere FISH assay detected almost twice the frequency of unbalanced karyotypes as those detected by 550 G-banding in our cytogenetics laboratory (4.7%). In addition, subtelomere screening was eight times more likely than fragile X screening in our DNA laboratory (1%) to detect genetic abnormalities in mentally handicapped individuals. Our findings support the view that screening for subtelomere rearrangements has a greater positive yield than other commonly used genetic investigations and, if cost and resources permit, should be the next diagnostic test of choice in a child with unexplained MR/dysmorphisms and a normal 550 G-band karyotype.
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Affiliation(s)
- A J Dawson
- Department of Pediatrics and Child Health, University of Manitoba, Canada.
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17
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Joyce CA, Dennis NR, Howard F, Davis LM, Thomas NS. An 11p;17p telomeric translocation in two families associated with recurrent miscarriages and Miller-Dieker syndrome. Eur J Hum Genet 2002; 10:707-14. [PMID: 12404102 DOI: 10.1038/sj.ejhg.5200882] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2002] [Revised: 07/18/2002] [Accepted: 07/24/2002] [Indexed: 12/08/2022] Open
Abstract
Translocations occur in a proportion of couples affected by recurrent miscarriages. We describe two such families in which the underlying cause was a cryptic subtelomeric 11p;17p translocation detected only after the birth of an affected child carrying an unbalanced form of the rearrangement. Unbalanced subtelomeric rearrangements are now recognised as a significant cause of mental impairment and we believe that these rearrangements may also be an important cause of recurrent miscarriages. In these two families the translocation is most likely to have arisen from a single ancestral event because all translocation carriers shared almost identical haplotypes around the breakpoints on both chromosomes.
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Affiliation(s)
- Christine A Joyce
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, Wiltshire, SP2 8BJ, UK
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18
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Engels H, Bosse K, Ehrbrecht A, Zahn S, Hoischen A, Propping P, Bindl L, Reutter H. Further case of Cantú syndrome: exclusion of cryptic subtelomeric chromosome aberrations. AMERICAN JOURNAL OF MEDICAL GENETICS 2002; 111:205-9. [PMID: 12210352 DOI: 10.1002/ajmg.10560] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Cantú syndrome consists of hypertrichosis, osteochondrodysplasia, and cardiomegaly, and has been reported in 18 patients to date. We report an infant with Cantú syndrome. In addition to typical findings, he had relatively mild radiological and cardiological manifestations. Previously undescribed findings included pyloric stenosis and elevated alkaline phosphatase levels. Brain scans showed bilateral calcification of the Arteriae thalamostriatae and widening of the outer liquor spaces and lateral ventricles. Because the propositus is the youngest patient reported to date, our findings refine the clinical spectrum of Cantú syndrome in neonates and young infants. The etiology and mode of inheritance of Cantú syndrome are unknown. Most cases are sporadic. Microdeletions have been discussed as a possible cause of Cantú syndrome. Recently, several syndromes with multiple congenital anomalies and mental retardation have been shown to be caused by subtelomeric chromosome aberrations. We excluded the presence of a cryptic subtelomeric chromosome anomaly in our patient by fluorescence in situ hybridization (FISH) screening with locus-specific probes.
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Affiliation(s)
- Hartmut Engels
- Institute of Human Genetics, University of Bonn, Bonn, Germany
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19
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Pettenati MJ, Jackle B, Bobby P, Stewart W, Von Kap-Herr C, Mowrey P, Rao PN, May KM. Unexpected retention and concomitant loss of subtelomeric regions in balanced chromosome anomalies by FISH. AMERICAN JOURNAL OF MEDICAL GENETICS 2002; 111:48-53. [PMID: 12124733 DOI: 10.1002/ajmg.10535] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Florescence in situ hybridization (FISH) using subtelomeric probes has been useful in detecting cryptic telomeric chromosomal rearrangements. We report, for the first time, that cytogenetically visible chromosome rearrangements can occur between the subtelomeric and telomeric region in clinically normal individuals with balanced chromosome anomalies in which one of the breakpoints involves a terminal band region. Using FISH with subtelomeric probes, we observed in three cases with a balanced reciprocal translocations the retention and subsequent loss of subtelomeric regions. In one case with a paracentric inversion, there was a proximal relocation of a subtelomeric region. Because subtelomeric regions serve important roles in chromosome pairing, this retention and concomitant loss or relocation of a subtelomeric region could possibly further disrupt the complex meiotic configurations of these balanced chromosome rearrangements. This may then have an effect on gamete production, placing these individuals at a higher risk for miscarriages and/or abnormal outcomes for individuals with similar chromosome aberrations.
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Affiliation(s)
- Mark J Pettenati
- Department of Pediatrics, Section on Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA.
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20
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Fan YS, Zhang Y. Subtelomeric translocations are not a frequent cause of recurrent miscarriages. AMERICAN JOURNAL OF MEDICAL GENETICS 2002; 109:154. [PMID: 11977165 DOI: 10.1002/ajmg.10336] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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21
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Pettenati MJ, Von Kap-Herr C, Jackle B, Bobby P, Mowrey P, Schwartz S, Rao PN, Rosnes J. Rapid interphase analysis for prenatal diagnosis of translocation carriers using subtelomeric probes. Prenat Diagn 2002; 22:193-7. [PMID: 11920892 DOI: 10.1002/pd.282] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Interphase fluorescence in situ hybridization (FISH) has become an accepted laboratory technique for the rapid and preliminary prenatal assessment of chromosome aneuploidy. The introduction of subtelomeric FISH probes now allows for the molecular-cytogenetic analysis of terminal chromosome rearrangements. In a prospective study, we examined the prenatal use of subtelomeric probes on interphase cells to rapidly detect the carrier status of a fetus when a parent carried a known reciprocal or Robertsonian chromosome translocation. Three of the cases were identified as being abnormal. All cases were confirmed by routine cytogenetic analysis. These findings clearly demonstrated the utility of this technique and these probes to rapidly and correctly identify balanced and unbalanced chromosome anomalies of a fetus that could result from parental translocations.
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MESH Headings
- Amniocentesis
- Aneuploidy
- Chorionic Villi Sampling
- Chromosomes, Human, Pair 10
- Chromosomes, Human, Pair 13
- Chromosomes, Human, Pair 15
- Chromosomes, Human, Pair 4
- DNA Probes
- Female
- Genetic Carrier Screening
- Humans
- In Situ Hybridization, Fluorescence
- Interphase
- Pregnancy
- Prenatal Diagnosis
- Prospective Studies
- Telomere
- Translocation, Genetic
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Affiliation(s)
- Mark J Pettenati
- Department of Pediatrics, Section on Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
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22
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Yakut S, Berker-Karaüzüm S, Simşek M, Zorlu G, Trak B, Lüleci G. Telomere-specific fluorescence in situ hybridization analysis of couples with five or more recurrent miscarriages. Clin Genet 2002; 61:26-31. [PMID: 11903351 DOI: 10.1034/j.1399-0004.2002.610105.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Fluorescence in situ hybridization analysis using telomere specific probes has been used to detect cryptic translocations in the chromosomal telomeric regions. This study was performed in five clinically normal couples who have had five or more spontaneous abortions and whose karyotypes were found to be normal using conventional cytogenetic techniques. Using the telomere specific probes, in one couple we determined a cryptic translocation between chromosome 3 and 10, and, in another couple, the signal in chromosome 20 was detected in another chromosome, which was probably a D group chromosome. Additionally, in the latter and also in two other couples, we observed a polymorphism. The approach will be helpful for screening cryptic translocations using telomere specific multiple probe sets in couples with recurrent miscarriages. As prenatal diagnosis will be available for these couples for future pregnancies, it will be possible to help these families to have healthy fetuses.
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Affiliation(s)
- S Yakut
- Akdeniz University, School of Medicine, Department of Medical Biology and Genetics, Antalya, Turkey.
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23
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Giardino D, Finelli P, Gottardi G, Clerici D, Mosca F, Briscioli V, Larizza L. Cryptic subtelomeric translocation t(2;16)(q37;q24) segregating in a family with unexplained stillbirths and a dysmorphic, slightly retarded child. Eur J Hum Genet 2001; 9:881-6. [PMID: 11840188 DOI: 10.1038/sj.ejhg.5200730] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2001] [Revised: 09/12/2001] [Accepted: 09/18/2001] [Indexed: 11/09/2022] Open
Abstract
We here describe a submicroscopic translocation affecting the subtelomeric regions of chromosomes 2q and 16q, and segregating in a family with stillbirths, early pregnancy losses, and two dysmorphic and slightly retarded babies. FISH analysis showed a 46,XY,der(2)t(2;16)(q37.3;q24.3) in the propositus, and a balanced t(2;16) in his mother, her conceptus and maternal grandfather. FISH with YACs and BACs made it possible to map the 2q37 breakpoint precisely between the regions covered by y952E1 and y746H1, and the 16q breakpoint between the regions encompassed by bA 309g16 and bA 533d19. The contribution of 2q37.3 monosomy and 16q24.3 trisomy to the proband's phenotype is compared with that in reported patients with similar imbalances of either chromosome.
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Affiliation(s)
- D Giardino
- Laboratorio di Citogenetica, Istituto Auxologico Italiano, Milan, Italy.
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24
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Fan YS, Zhang Y, Speevak M, Farrell S, Jung JH, Siu VM. Detection of submicroscopic aberrations in patients with unexplained mental retardation by fluorescence in situ hybridization using multiple subtelomeric probes. Genet Med 2001; 3:416-21. [PMID: 11715006 DOI: 10.1097/00125817-200111000-00007] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2022] Open
Abstract
PURPOSE To further assess the frequency of subtelomeric aberrations in a selected population and to examine the feasibility of a clinical testing. METHODS Patients were selected based on the following criteria: (1) mental retardation (IQ < 70) or developmental delay with dysmorphic features; (2) a normal karyotype at the level of resolution of 450 to 500 bands; and (3) exclusion of other possible etiologies by a full genetic assessment and relevant tests. Fluorescence in situ hybridization (FISH) was performed using multiple subtelomeric probes. Abnormal findings were confirmed by 24-color spectral karyotyping or FISH with a specific subtelomeric probe, and family studies were carried out to determine inheritance. RESULTS Clinically significant aberrations were detected in 6 of 150 proband patients (4%), while deletion of the 2q subtelomeric region appeared to be a common variant (6%). CONCLUSIONS FISH with multiple subtelomeric probes is a valuable clinical test for establishing a definitive diagnosis for patients with unexplained mental retardation/developmental disorders.
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Affiliation(s)
- Y S Fan
- London Health Sciences Centre and the University of Western Ontario, London, Canada
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25
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Abstract
In the past decade, clinical cytogenetics has undergone remarkable advancement as molecular biology techniques have been applied to conventional chromosome analysis. The limitations of conventional banding analysis in the accurate diagnosis and interpretation of certain chromosome abnormalities have largely been overcome by these new technologies, which include fluorescence in situ hybridization (FISH), comparative genomic hybridization (CGH), and multicolor FISH (M-FISH, SKY, and Rx-FISH). Clinical applications include diagnosis of microdeletion and microduplication syndromes, detection of subtelomeric rearrangements in idiopathic mental retardation, identification of marker and derivative chromosomes, prenatal diagnosis of trisomy syndromes, and gene rearrangements and gene amplification in tumors. Molecular cytogenetic methods have expanded the possibilities for precise genetic diagnoses, which are extremely important for clinical management of patients and appropriate counseling of their families.
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Affiliation(s)
- N J Carpenter
- Department of Cytogenetics and Molecular Genetics, HA Chapman Institute of Medical Genetics, Tulsa, OK 74135, USA
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26
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Henegariu O, Artan S, Greally JM, Chen XN, Korenberg JR, Vance GH, Stubbs L, Bray-Ward P, Ward DC. Cryptic translocation identification in human and mouse using several telomeric multiplex fish (TM-FISH) strategies. J Transl Med 2001; 81:483-91. [PMID: 11304567 DOI: 10.1038/labinvest.3780256] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Experimental data published in recent years showed that up to 10% of all cases of mild to severe idiopathic mental retardation may result from small rearrangements of the subtelomeric regions of human chromosomes. To detect such cryptic translocations, we developed a "telomeric" multiplex fluorescence in situ hybridization (M-FISH) assay, using a set of previously published and commercially available subtelomeric probes. This set of probes includes 41 cosmid/PAC/P1 clones located from less than 100 kilobases to approximately 1 megabase from the end of the chromosomes. Similarly, a published mouse probe set, comprised of BACs hybridizing to the closest known marker toward the centromere and telomere of each mouse chromosome, was used to develop a mouse-specific "telomeric" M-FISH. Three different combinatorial labeling strategies were used to simultaneously detect all human subtelomeric regions on one slide. The simplest approach uses only three fluors and can be performed in laboratories lacking sophisticated imaging equipment or personnel highly trained in cytogenetics. A standard fluorescence microscope equipped with only three filters is sufficient. Fluor-dUTPs and labeled probes can be custom made, thus dramatically reducing costs. Images can be prepared using imaging software (Adobe Photoshop) and analysis performed by simple visual inspection.
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Affiliation(s)
- O Henegariu
- Department of Genetics, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
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27
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Schultz LN, Schmidt P, Tabor A, Bryndorf T, Christensen B, Lundsteen C. Cryptic familial t(11;18)(q25;q23) incidentally detected by interphase FISH. Clin Genet 2001; 59:279-83. [PMID: 11298685 DOI: 10.1034/j.1399-0004.2001.590411.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
During a prospective prenatal study of numerical abnormalities of chromosomes 13, 18, 21, X and Y using locus-specific probes, we incidentally found a case with only one signal for chromosome 18 per cell in a chorionic villus sampling (CVS) associated with an otherwise apparently normal G-banded karyotype. This led us to discover a cryptic t(11;18) segregating in a four-generation family. The CVS was performed because of mental retardation in the brother to the father of the fetus. A subtelomeric chromosome 18 probe revealed one signal on 18qter and one on 11qter of the father. Thus the father had a balanced reciprocal t(11;18) in spite of the apparently normal G-banded karyotype. Using the same probes, we found an unbalanced translocation 46,XX,-18,+der (18)t(11;18)-(q25;q23)pat in the fetus. Further investigation of the family showed the translocation in balanced and unbalanced form in four generations in mentally normal and retarded individuals, respectively. The study emphasizes the need for a follow-up with molecular cytogenetic techniques in dysmorphic and retarded children.
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Affiliation(s)
- L N Schultz
- Cytogenetic Laboratory, Department of Clinical Genetics, Juliane Marie Center, Rigshospitalet, Copenhagen, Denmark
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28
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Ballif BC, Kashork CD, Shaffer LG. The promise and pitfalls of telomere region-specific probes. Am J Hum Genet 2000; 67:1356-9. [PMID: 11032793 PMCID: PMC1288581 DOI: 10.1016/s0002-9297(07)62969-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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29
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Ballif BC, Kashork CD, Shaffer LG. The Promise and Pitfalls of Telomere Region–Specific Probes. Am J Hum Genet 2000. [DOI: 10.1086/321198] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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