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Coussement A, Lochu P, Dupont JM, Choiset A. Inherited interstitial 16q21 deletion of 5.8 Mb without apparent phenotypic effect in three generations of a family: an array-CGH study. Am J Med Genet A 2011; 155A:2597-600. [PMID: 21910236 DOI: 10.1002/ajmg.a.34210] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Accepted: 06/09/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Aurélie Coussement
- Laboratoire de Cytogénétique, Groupe Hospitalier Cochin-Saint Vincent de Paul, AP-HP, Paris, France
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2
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The distal partial trisomy 1q syndrome and dystonic tremor. Parkinsonism Relat Disord 2011; 17:128-9. [DOI: 10.1016/j.parkreldis.2010.10.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/22/2010] [Revised: 09/26/2010] [Accepted: 10/08/2010] [Indexed: 11/23/2022]
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3
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Misceo D, Rocchi M, van der Hagen CB, Frengen E. A partial trisomy 1q patient with a deletion 1q22 and an insertion 1(q42q44) into 1q22. Am J Med Genet A 2009; 149A:290-3. [PMID: 19161140 DOI: 10.1002/ajmg.a.32623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Doriana Misceo
- Department of Medical Genetics, Ullevål University Hospital and Faculty of Medicine, University of Oslo, Oslo, Norway
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4
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Goumy C, Gouas L, Tchirkov A, Roucaute T, Giollant M, Veronèse L, Francannet C, Vago P. Familial deletion 11q14.3-q22.1 without apparent phenotypic consequences: A haplosufficient 8.5 Mb region. Am J Med Genet A 2008; 146A:2668-72. [DOI: 10.1002/ajmg.a.32511] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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5
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Tuschl K, Fritz B, Herle M, Fonatsch C, Bodamer OA. Trisomy 1q42.3-qter and monosomy 21q22.3-qter associated with ear anomaly, facial dysmorphology, psychomotor retardation, and epilepsy: delineation of a new syndrome. Am J Med Genet A 2007; 143A:2065-9. [PMID: 17676599 DOI: 10.1002/ajmg.a.31792] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Karin Tuschl
- Biochemical and Paediatric Genetics, Department of General Paediatrics, University Children's Hospital, Medical University Vienna, Vienna, Austria
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6
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Coccé MC, Villa O, Obregon MG, Salido M, Barreiro C, Solé F, Gallego MS. Duplication dup(1)(q41q44) defined by fluorescence in situ hybridization: delineation of the ‘trisomy 1q42→qter syndrome’. Cytogenet Genome Res 2007; 118:84-6. [PMID: 17901705 DOI: 10.1159/000106446] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Accepted: 03/07/2007] [Indexed: 11/19/2022] Open
Abstract
We report on a novel case of pure partial tandem duplication 1q42q43 confirmed by fluorescence in situ hybridization (FISH). We compare the manifestations of our patient with similar cases previously reported. We conclude that the most common clinical manifestations of trisomy 1q42qter are prenatal and postnatal growth retardation, relative macrocephaly, triangular face, prominent forehead, broad nasal bridge, abnormal philtrum, micro/retrognathia, cardiac defects and mental retardation. We would like to emphasize the importance of the FISH technique in the identification of the duplicated segment.
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Affiliation(s)
- M C Coccé
- Laboratorio de Citogenética, Servicio de Genética, Hospital de Pediatría Prof. Dr. J.P. Garrahan, Buenos Aires, Argentina.
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7
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Kowalczyk M, Srebniak M, Tomaszewska A. Chromosome abnormalities without phenotypic consequences. J Appl Genet 2007; 48:157-66. [PMID: 17495350 DOI: 10.1007/bf03194674] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Some changes in chromosome morphology, detected during cytogenetic analysis, are not associated with clinical defects. Therefore a proper discrimination of harmless variants from true abnormalities, especially during prenatal diagnosis, is crucial to allow precise counseling. In this review we described chromosome variants and examples of chromosome anomalies that are considered to be unrelated to phenotypic consequences. The correlation between the presence of marker chromosomes and a risk of clinical signs is also discussed. Structural rearrangements of heterochromatic material, satellite polymorphism, or fragile sites, are well-known examples of common chromosome variation. However, the absence of clinical effects has also been reported in some cases of chromosome abnormalities concerning euchromatin. Such euchromatic anomalies were divided into 2 categories: unbalanced chromosome abnormalities (UBCAs), such as deletions or duplications, and euchromatic variants (EVs). Recently so-called molecular karyotyping, especially whole-genome screening by the use of high-resolution array-CGH technique, contributed to revealing a high number of previously unknown small genomic variations, which seem to be asymptomatic, as they are present in phenotypically normal individuals.
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Affiliation(s)
- Małgorzata Kowalczyk
- Department of Medical Genetics, Medical University of Silesia, Sosnowiec, Poland
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8
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Abstract
In total, 200 families were reviewed with directly transmitted, cytogenetically visible unbalanced chromosome abnormalities (UBCAs) or euchromatic variants (EVs). Both the 130 UBCA and 70 EV families were divided into three groups depending on the presence or absence of an abnormal phenotype in parents and offspring. No detectable phenotypic effect was evident in 23/130 (18%) UBCA families ascertained mostly through prenatal diagnosis (group 1). In 30/130 (23%) families, the affected proband had the same UBCA as other phenotypically normal family members (group 2). In the remaining 77/130 (59%) families, UBCAs had consistently mild consequences (group 3). In the 70 families with established EVs of 8p23.1, 9p12, 9q12, 15q11.2, and 16p11.2, no phenotypic effect was apparent in 38/70 (54%). The same EV was found in affected probands and phenotypically normal family members in 30/70 families (43%) (group 2), and an EV co-segregated with mild phenotypic anomalies in only 2/70 (3%) families (group 3). Recent evidence indicates that EVs involve copy number variation of common paralogous gene and pseudogene sequences that are polymorphic in the normal population and only become visible at the cytogenetic level when copy number is high. The average size of the deletions and duplications in all three groups of UBCAs was close to 10 Mb, and these UBCAs and EVs form the "Chromosome Anomaly Collection" at http://www.ngrl.org.uk/Wessex/collection. The continuum of severity associated with UBCAs and the variability of the genome at the sub-cytogenetic level make further close collaboration between medical and laboratory staff essential to distinguish clinically silent variation from pathogenic rearrangement.
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Affiliation(s)
- J C K Barber
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, Wiltshire SP2 8BJ, UK.
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9
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Barber JCK, Thomas NS, Collinson MN, Dennis NR, Liehr T, Weise A, Belitz B, Pfeiffer L, Kirchhoff M, Krag-Olsen B, Lundsteen C. Segmental haplosufficiency: transmitted deletions of 2p12 include a pancreatic regeneration gene cluster and have no apparent phenotypic consequences. Eur J Hum Genet 2005; 13:283-91. [PMID: 15657610 DOI: 10.1038/sj.ejhg.5201267] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Segmental aneuploidy usually has phenotypic consequences but unbalanced rearrangements without phenotypic consequences have also been reported. In particular, harmless deletions of G-dark bands 5p14 and 16q21 have each been found in more than one independent family. Here, we report two families that were ascertained at prenatal diagnosis and had similar overlapping deletions that removed most of the gene poor G-dark band 2p12. PCR mapping showed that the deletions had a minimum size of 6.1 and 6.9 Mb with at least 13 hemizygous loci including a cluster of six pancreatic islet-regenerating genes. These deletions had no apparent phenotypic consequences in eight family members. In contrast, a third family was ascertained through a child with Wilm's tumour; both the child and his mother had more proximal deletions, developmental delay and some dysmorphic features. The deletion had a minimum size of 5.7 Mb and extended into the gene-rich area of 2p11.2. These results are consistent with the idea that there may be segments of the genome that are consistently haplosufficient. The introduction of higher resolution methods of dosage analysis into diagnostic laboratories is already revealing more transmitted abnormalities of uncertain significance. As a result, published cases of transmitted imbalances have been collected as a guide to the possible significance of such findings in the future (see the 'Chromosome Anomaly Collection' at www.som.soton.ac.uk/research/geneticsdiv).
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Affiliation(s)
- John C K Barber
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, Wiltshire SP2 8BJ, UK.
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10
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Christiansen LR, Lage JM, Wolff DJ, Pai GS, Harley RA. Mosaic duplication 1(q11q44) in an infant with nephroblastomatosis and mineralization of extraplacental membranes. Pediatr Dev Pathol 2005; 8:115-23. [PMID: 15803218 DOI: 10.1007/s10024-003-9098-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2003] [Accepted: 09/01/2004] [Indexed: 11/30/2022]
Abstract
Partial trisomy of 1q is rare. Only 32 cases of isolated partial trisomy 1q have been previously reported. From these cases, a characteristic phenotype is beginning to emerge. We present a case of mosaic duplication of 1q [46,XX,dup (1)(q11q44)/46,XX]. Many features of our patient have been described in previous patients, thus supporting the emerging phenotype. Two particular features, however, have not been previously described. The present case demonstrated extensive mineralization of the extraplacental membranes and bilateral nephromegaly, with an extreme form of diffusely hyperplastic perilobar nephroblastomatosis. Clinical comparison is made between our case and previously reported cases, and the clinical significance of the unique findings are reviewed and discussed.
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Affiliation(s)
- Lydia R Christiansen
- Department of Pathology and Laboratory Medicine, Medical University of South Carolina, 165 Ashley Avenue, Suite 309, Charleston, SC 29425, USA.
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11
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Kozma C, Slavotinek AM, Meck JM. Segregation of a t(1;3) translocation in multiple affected family members with both types of adjacent-1 segregants. Am J Med Genet A 2004; 124A:118-28. [PMID: 14699608 DOI: 10.1002/ajmg.a.20332] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A subtle balanced translocation involving the terminal regions of 1q and 3p was identified in a large family by high-resolution karyotype analysis and confirmed by fluorescence in situ hybridization (FISH) analysis. In this family, segregation of a balanced t(1:3)(q42.3;p25) chromosome translocation led to two types of viable unbalanced complements. The proband inherited the derivative chromosome 3, resulting in partial trisomy of 1q and partial monosomy of 3p. A paternal uncle and cousin had the reciprocal rearrangement with a derivative of chromosome 1, resulting in partial monosomy for 1q and partial trisomy for 3p. While profound mental and physical retardation and congenital heart defects were characteristics for both rearrangements, facial dysmorphism was quite distinct for each imbalance. Individuals who had the derivative chromosome 3 had a long face, wide eyebrows, small palpebral fissures, hypertelorism, prominent glabella, a large tip of the nose, long philtrum with thin upper lip, and low set-ears. In contrast, family members with the derivative of chromosome 1 had a tall forehead with bifrontal narrowing, full and large cheeks, and large simple ears. Since the translocated segments are small and approximately equal in size in this family, it is not surprising that viability was seen in individuals with both types of adjacent-1 segregation. In this kindred, the ratio of normal to abnormal individuals born to balanced carriers is believed to be about 1:1.5. This suggests that the recurrence risk for carriers is 50%.
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MESH Headings
- Abnormalities, Multiple/genetics
- Abnormalities, Multiple/pathology
- Adult
- Chromosome Banding
- Chromosome Segregation
- Chromosomes, Human, Pair 1/genetics
- Chromosomes, Human, Pair 3/genetics
- Face/abnormalities
- Family Health
- Fatal Outcome
- Female
- Growth Disorders/pathology
- Heart Defects, Congenital/pathology
- Humans
- Hypertelorism/pathology
- In Situ Hybridization, Fluorescence
- Infant
- Infant, Newborn
- Intellectual Disability/pathology
- Karyotyping
- Male
- Nose/abnormalities
- Pedigree
- Translocation, Genetic
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Affiliation(s)
- Chahira Kozma
- Department of Pediatrics, Georgetown University Medical Center, Washington, DC, USA.
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12
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Moreno García M, Fernández Martínez FJ, Barreiro Miranda E. Repercusión clínica de las anomalías cromosómicas. An Pediatr (Barc) 2004; 61:236-41. [PMID: 15469808 DOI: 10.1016/s1695-4033(04)78803-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
The incidence of chromosome anomalies in newborn infants is 0.7-0.8 %. The phenotypic manifestations of chromosomal abnormalities are highly diverse. These anomalies may be present in phenotypically normal individuals in whom they can increase the risk of recurrent miscarriage and birth defects and/or mental retardation. It is important to determine this risk to provide patients with appropriate genetic counseling.
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Affiliation(s)
- M Moreno García
- Servicio de Genética, Hospital 12 de Octubre, Madrid, Spain.
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13
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Baialardo EM, Torrado MDV, Barreiro CZ, Gallego MS. Partial distal 5p trisomy resulting from paternal translocation (5;15)(p15.1;p13) in a boy with no mental retardation. Clin Dysmorphol 2003; 12:257-9. [PMID: 14564214 DOI: 10.1097/00019605-200310000-00009] [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: 11/25/2022]
Abstract
We report a boy with partial distal 5p15.1-->pter trisomy and normal development. We compared the clinical findings in our patient with those previously reported of the same 5p duplicated region. Several cases of autosomal duplications and normal development have been described. The present case is another example of a chromosomal anomaly with little, if any, phenotypic effect without mental retardation.
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Affiliation(s)
- Edgardo M Baialardo
- Cytogenetics Laboratory, Department of Genetics, Hospital do Pediatria J.P. Garrahan, Combate de Los Pozos 1881, CP1245, Buenos Aires, Argentina.
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14
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Domínguez MG, Wong-Ley LE, Rivera H, Vásquez AI, Ramos AL, Sánchez-Urbina R, Morales JA, Figuera LE. Pure partial trisomy 6p due to a familial insertion (16;6)(p12;p21.2p23). ANNALES DE GENETIQUE 2003; 46:45-8. [PMID: 12818529 DOI: 10.1016/s0003-3995(03)00004-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
There have only been eight patients with 6p pure trisomy involving different segments: four cases resulted from a translocation or insertion and four were due to an intrachromosomal duplication. We report here the first postnatally ascertained patient with a pure 6p partial trisomy due to an interchromosomal insertion (16;6)(p12;p21.2p23)mat. This rearrangement was confirmed by fluorescent in situ hybridization (FISH) with whole chromosome 6 and 16 painting probes. The clinical findings in the present patient were similar to those observed in previous cases, including craniofacial dysmorphism, minor anomalies, and lack of severe anatomical defects; yet, the unspecificity of many of these features prevented us from delineating the 6p pure trisomy syndrome.
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Affiliation(s)
- María G Domínguez
- División de Genética, Centro de Investigación Biomédica de Occidente, Instituto Mexicano del Seguro Social, Ap. Postal 1-3838, Jalisco, Guadalajara, Mexico
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15
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Pettenati MJ, Berry M, Shashi V, Hartley Bowen J, Harper M. Prenatal diagnosis of complete sole trisomy 1q. Prenat Diagn 2001; 21:435-40. [PMID: 11438944 DOI: 10.1002/pd.64] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The prenatal diagnosis of a complete trisomy of the long arm of chromosome 1 is reported. Major ultrasound findings included: nuchal thickening, bi-temporal narrowing, a single choroid plexus cyst, and mild ventriculomegaly. There was a mass in the chest and abdomen, pleural effusion, ascites and a hyperechoic bowel. Skin edema was present. The fetus died at 26 weeks' gestation. A literature review is presented of 17 de novo and two inherited cases with only trisomy 1q. Of note is the fact that 3/5 prenatally detected 1q trisomies have teratomas. A review of the literature reveals a dismal outcome for trisomy 1q cases if the duplication involves bands 1q25-->q32.
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Affiliation(s)
- M J Pettenati
- Department of Pediatrics, Section on Medical Genetics, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA
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16
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17
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Gfatter R, Braun F, Schnedl W. The common features of patients with partial trisomy of the long arm of chromosome 1. Clin Genet 1998; 54:161-3. [PMID: 9761398 DOI: 10.1111/j.1399-0004.1998.tb03722.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Barber JC, Joyce CA, Collinson MN, Nicholson JC, Willatt LR, Dyson HM, Bateman MS, Green AJ, Yates JR, Dennis NR. Duplication of 8p23.1: a cytogenetic anomaly with no established clinical significance. J Med Genet 1998; 35:491-6. [PMID: 9643291 PMCID: PMC1051344 DOI: 10.1136/jmg.35.6.491] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
We present seven families with a cytogenetic duplication of the short arm of chromosome 8 at band 8p23.1. The duplication has been transmitted from parents to offspring in four of the seven families. In three families, the source of the extra material and its euchromatic origin were established using FISH with a YAC which was mapped to 8p23.1 and a whole chromosome paint for chromosome 8. FISH signals from this YAC were significantly larger on the duplicated chromosome compared with the normal chromosome in all six family members tested. Comparative genomic hybridisation (CGH) on a representative subject was consistent with these results. The families were ascertained for a variety of mostly incidental reasons including prenatal diagnosis for advanced maternal age. The transmission of this duplication by multiple phenotypically normal family members with no history of reproductive loss suggests the existence of a novel class of 8p23.1 duplications, which can be regarded as euchromatic variants or duplications with no phenotypic effect.
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Affiliation(s)
- J C Barber
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Wiltshire, UK
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19
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Glass IA, Stormer P, Oei PT, Hacking E, Cotter PD. Trisomy 2q11.2-->q21.1 resulting from an unbalanced insertion in two generations. J Med Genet 1998; 35:319-22. [PMID: 9598728 PMCID: PMC1051282 DOI: 10.1136/jmg.35.4.319] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
In this communication, we describe two cases of proximal 2q trisomy (2q11.2--> q21.1) resulting from an interchromosomal insertion. The chromosomal origin of the insertion was confirmed by fluorescence in situ hybridisation. An unbalanced karyotype, 46,XX,der(8) ,ins(8;2) (p21.3; q21.1q11.2), was found in the proband and her mother, who both have mild mental retardation, short stature, dysmorphic features, insulin dependent diabetes mellitus, and a psychotic illness. This family is a rare example of direct transmission of a partial autosomal trisomy.
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Affiliation(s)
- I A Glass
- Queensland Clinical Genetics Service, Herston, Australia
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20
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Byth BC, Costa MT, Teshima IE, Wilson WG, Carter NP, Cox DW. Molecular analysis of three patients with interstitial deletions of chromosome band 14q31. J Med Genet 1995; 32:564-7. [PMID: 7562974 PMCID: PMC1050554 DOI: 10.1136/jmg.32.7.564] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Two patients and one three generation family with interstitial deletions of distal chromosome band 14q31 are described. The deletions were initially identified by chromosome analysis; we have used highly informative simple sequence repeat polymorphisms to define the deletions at the molecular level. This analysis also establishes the parental origin of the deleted chromosome. One of the patients was initially described as having a terminal deletion of chromosome 14 from 14q31 to 14qter; we show here that this child has instead an interstitial deletion of band 14q31. The smallest deletion involves a single anonymous DNA marker and is associated with an almost normal phenotype. The two patients with larger deletions have phenotypes similar to those seen in previously described cases of interstitial deletions of chromosome 14, including minor dysmorphic features and developmental delay. Delineation of these deletions allows the ordering of markers within the 14q31 region, in which the gene for the degenerative neurological disorder Machado-Joseph disease is localised.
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Affiliation(s)
- B C Byth
- Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
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22
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DuPont BR, Huff RW, Ridgway LE, Stratton RF, Moore CM. Prenatal diagnosis of partial trisomy 1q using fluorescent in situ hybridization. AMERICAN JOURNAL OF MEDICAL GENETICS 1994; 50:21-7. [PMID: 8160748 DOI: 10.1002/ajmg.1320500105] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report the use of fluorescent in situ hybridization (FISH) with a DNA library of chromosome 1-specific probes to confirm the karyotype, 46,XY,15+der15,t(1;15)(q32.1; q26.3), obtained by prenatal periumbilical blood sampling from a fetus who exhibited multiple abnormalities by ultrasound examination. GTG-banding of chromosomes obtained from the mother showed a normal karyotype, while the father was unavailable for study. The propositus was born at 37 weeks gestation and survived for several weeks. Cytogenetic analysis performed after the birth of the male infant with multiple anomalies verified partial trisomy 1q. This patient is compared with other partial trisomy 1q patients reported in the literature. The usefulness of FISH is demonstrated in situations where fetal abnormalities are present with de novo chromosomal rearrangements where paternal chromosomes are unavailable for study.
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Affiliation(s)
- B R DuPont
- Department of Cellular and Structural Biology, University of Texas Health Science Center, San Antonio 78284-7762
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23
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Arai E, Ikeuchi T, Karasawa S, Tamura A, Yamamoto K, Kida M, Ichimura K, Yuasa Y, Tonomura A. Constitutional translocation t(4;22) (q12;q12.2) associated with neurofibromatosis type 2. AMERICAN JOURNAL OF MEDICAL GENETICS 1992; 44:163-7. [PMID: 1456285 DOI: 10.1002/ajmg.1320440209] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
We report on a female patient with bilateral acoustic neurinomas and other tumors in the central nervous system (neurofibromatosis type 2: NF2) and the constitutional translocation, t(4;22) (q12;q12.2). The precise identification of the translocation breakpoint (q12.2) on chromosome 22 implies the refined localization of a gene responsible for NF2, and would provide a clue to its molecular characterization and to the isolation of the gene. Chromosomes of a paraspinal neurinoma from the patient were also analyzed, and the same karyotype as seen in cultured peripheral lymphocytes was found. The patient's father was also a carrier of the translocation, but he had no clinical symptoms of NF2, nor did other relatives. Several explanations are offered for the different expression of the translocation between the patient and her father.
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Affiliation(s)
- E Arai
- Department of Cytogenetics, Tokyo Medical and Dental University, Japan
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