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Chaudhry A, Noor A, Degagne B, Baker K, Bok LA, Brady AF, Chitayat D, Chung BH, Cytrynbaum C, Dyment D, Filges I, Helm B, Hutchison HT, Jeng LJB, Laumonnier F, Marshall CR, Menzel M, Parkash S, Parker MJ, Raymond LF, Rideout AL, Roberts W, Rupps R, Schanze I, Schrander-Stumpel CTRM, Speevak MD, Stavropoulos DJ, Stevens SJC, Thomas ERA, Toutain A, Vergano S, Weksberg R, Scherer SW, Vincent JB, Carter MT. Phenotypic spectrum associated withPTCHD1deletions and truncating mutations includes intellectual disability and autism spectrum disorder. Clin Genet 2014; 88:224-33. [DOI: 10.1111/cge.12482] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2014] [Revised: 08/08/2014] [Accepted: 08/08/2014] [Indexed: 11/28/2022]
Affiliation(s)
- A. Chaudhry
- Department of Pediatrics; Division of Clinical and Metabolic Genetics; The Hospital for Sick Children; Toronto Ontario Canada
| | - A. Noor
- Department of Pathology and Laboratory Medicine; The Hospital for Sick Children; Toronto Ontario Canada
- Molecular Neuropsychiatry and Development Lab; Campbell Family Mental Health Research Institute, The Centre for Addiction and Mental Health; Toronto Ontario Canada
| | - B. Degagne
- Molecular Neuropsychiatry and Development Lab; Campbell Family Mental Health Research Institute, The Centre for Addiction and Mental Health; Toronto Ontario Canada
| | - K. Baker
- Department of Medical Genetics; Cambridge UK
- Institute for Medical Research Wellcome Trust; University of Cambridge; Cambridge UK
| | - L. A. Bok
- Department of Clinical Genetics, Unit of Cytogenetics; Maastricht University Medical Center; Maastricht The Netherlands
| | - A. F. Brady
- North West Thames Regional Genetics Service; Northwick Park Hospital; Harrow UK
| | - D. Chitayat
- Department of Pediatrics; Division of Clinical and Metabolic Genetics; The Hospital for Sick Children; Toronto Ontario Canada
- The Prenatal Diagnosis and Medical Genetics Program, Department of Obstetrics and Gynecology, Mount Sinai Hospital; University of Toronto; Toronto Ontario Canada
| | - B. H. Chung
- Department of Pediatrics and Adolescent Medicine, Department of Obstetrics and Gynaecology, Centre for Reproduction, Development and Growth, Centre for Genomic Sciences; The University of Hong Kong; Pok Fu Lam, Hong Kong
| | - C. Cytrynbaum
- Department of Pediatrics; Division of Clinical and Metabolic Genetics; The Hospital for Sick Children; Toronto Ontario Canada
- Genetics and Genome Biology; The Hospital for Sick Children; Toronto Ontario Canada
| | - D. Dyment
- Department of Genetics; Children's Hospital of Eastern Ontario; Ottawa Ontario Canada
| | - I. Filges
- Division of Medical Genetics, Department of Biomedicine; University Hospital Basel; Basel Switzerland
| | - B. Helm
- Division of Medical Genetics and Metabolism; Children's Hospital of The King's Daughters/Eastern Virginia Medical School; Norfolk VA USA
| | - H. T. Hutchison
- Departments of Neurology and Pediatrics; UCSF Fresno Medical Education Program; San Francisco CA USA
| | - L. J. B. Jeng
- Department of Laboratory Medicine; University of California; San Francisco CA USA
| | - F. Laumonnier
- UMR_INSERM U930 Faculté de Médecine; Université François Rabelais; Tours France
| | - C. R. Marshall
- The Centre for Applied Genomics; The Hospital for Sick Children; Toronto Ontario Canada
| | | | - S. Parkash
- Maritime Medical Genetics Service; IWK Health Centre; Halifax Nova Scotia Canada
- Dalhousie University Halifax; Nova Scotia Canada
| | - M. J. Parker
- Sheffield Clinical Genetics Service; Sheffield Children's Hospital; Western Bank Sheffield UK
| | - L. F. Raymond
- Department of Medical Genetics; Cambridge UK
- Institute for Medical Research Wellcome Trust; University of Cambridge; Cambridge UK
| | - A. L. Rideout
- Maritime Medical Genetics Service; IWK Health Centre; Halifax Nova Scotia Canada
| | - W. Roberts
- Autism Research Unit; The Hospital for Sick Children; Toronto Ontario Canada
| | - R. Rupps
- Department of Medical Genetics, Children's and Women's Health Centre; University of British Columbia; Vancouver BC Canada
| | - I. Schanze
- Institute of Human Genetics; University Hospital Magedeburg; Magedeburg Germany
| | - C. T. R. M. Schrander-Stumpel
- Department of Clinical Genetics and School for Oncology & Developmental Biology (GROW); Maastricht UMC+; Maastricht The Netherlands
| | - M. D. Speevak
- Credit Valley Site, Trillium Health Partners, Department of Laboratory Medicine and Pathobiology; University of Toronto; Toronto Onatario Canada
| | - D. J. Stavropoulos
- Department of Pathology and Laboratory Medicine; The Hospital for Sick Children; Toronto Ontario Canada
- The Centre for Applied Genomics; The Hospital for Sick Children; Toronto Ontario Canada
| | - S. J. C. Stevens
- Department of Clinical Genetics and School for Oncology & Developmental Biology (GROW); Maastricht UMC+; Maastricht The Netherlands
| | - E. R. A. Thomas
- Clinical Genetics Department; Guy's and St Thomas' NHS Foundation Trust; London UK
| | - A. Toutain
- UMR_INSERM U930 Faculté de Médecine; Université François Rabelais; Tours France
- Service de Génétique; Centre Hospitalo-Universitaire; Tours France
| | - S. Vergano
- Division of Medical Genetics and Metabolism; Children's Hospital of The King's Daughters/Eastern Virginia Medical School; Norfolk VA USA
| | - R. Weksberg
- Department of Pediatrics; Division of Clinical and Metabolic Genetics; The Hospital for Sick Children; Toronto Ontario Canada
- Institute of Medical Science; Toronto Ontario Canada
- McLaughlin Centre and Department of Molecular Genetics; Toronto Ontario Canada
| | - S. W. Scherer
- The Centre for Applied Genomics; The Hospital for Sick Children; Toronto Ontario Canada
- Institute of Medical Science; Toronto Ontario Canada
- McLaughlin Centre and Department of Molecular Genetics; Toronto Ontario Canada
| | - J. B. Vincent
- Molecular Neuropsychiatry and Development Lab; Campbell Family Mental Health Research Institute, The Centre for Addiction and Mental Health; Toronto Ontario Canada
- Institute of Medical Science; Toronto Ontario Canada
- Department of Psychiatry; University of Toronto; Toronto Ontario Canada
| | - M. T. Carter
- Department of Pediatrics; Division of Clinical and Metabolic Genetics; The Hospital for Sick Children; Toronto Ontario Canada
- Autism Research Unit; The Hospital for Sick Children; Toronto Ontario Canada
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Speevak MD, Zeesman S, Leonard N, Nowaczyk MJ. Further evidence that a 100 Kb critical region is responsible for developmental delay, seizures, and dysmorphic features in 1q43q44 deletion patients. Am J Med Genet A 2013; 161A:913-5. [PMID: 23495039 DOI: 10.1002/ajmg.a.35828] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Accepted: 12/05/2012] [Indexed: 02/04/2023]
Affiliation(s)
- M D Speevak
- Genetics Department, Credit Valley Hospital, Mississauga, Ontario, Canada.
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Campbell J, Speevak MD. TheBRCA1S1715N mutation segregates with breast and ovarian cancer in an extended family pedigree. Clin Genet 2012; 83:485-7. [DOI: 10.1111/j.1399-0004.2012.01933.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2012] [Revised: 07/05/2012] [Accepted: 07/06/2012] [Indexed: 11/29/2022]
Affiliation(s)
- J Campbell
- Department of Genetics; Credit Valley Hospital; Mississauga; Ontario; L5M 2N1; Canada
| | - MD Speevak
- Department of Genetics; Credit Valley Hospital; Mississauga; Ontario; L5M 2N1; Canada
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Speevak MD, Dolling J, Terespolsky D, Blumenthal A, Farrell SA. An algorithm for the prenatal detection of chromosome anomalies by QF-PCR and G-banded analysis. Prenat Diagn 2008; 28:1221-6. [DOI: 10.1002/pd.2159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Bruyère H, Speevak MD, Winsor EJT, de Fréminville B, Farrell SA, McGowan-Jordan J, McGillivray B, Chitayat D, McFadden D, Adouard V, Terespolsky D, Prieur F, Pantzar T, Hrynchak M. Isodicentric Yp: prenatal diagnosis and outcome in 12 cases. Prenat Diagn 2006; 26:324-9. [PMID: 16521154 DOI: 10.1002/pd.1406] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVES 1. To present the prenatal cytogenetic findings and postnatal outcome of 12 cases with an isodicentric chromosome composed of the short arm of the Y chromosome.2. To review the literature and provide recommendations for cytogenetic analysis and counseling. METHODS Prenatal and postnatal cytogenetic data and clinical findings of isodicentric Yp ascertained in six institutions were gathered and reviewed. RESULTS Nine of the twelve cases were referred for advanced maternal age (AMA), one of which was a twin pregnancy with one twin having an increased nuchal translucency measurement. The remaining cases were referred owing to a family history of hemophilia and an abnormal maternal serum screen, respectively. Nine of these pregnancies resulted in the birth of a normal-appearing male infant with subsequent normal growth and psychomotor development. Follow-up ranged from birth to 7 years. In two cases, the pregnancy was terminated and the fetuses showed male external genitalia. In the case ascertained because of an increased nuchal translucency measurement, the prenatal diagnosis of 45,X was made. At birth, there were ambiguous genitalia, and postnatal cytogenetic studies found an isodicentric Yp. In 11 of the 12 cases, mosaicism was present. CONCLUSION Our cases show that the prenatal finding of an isodicentric Yp, with or without 45,X mosaicism, is compatible with normal male phenotype in most cases, particularly in the absence of other anomalies. To ensure accuracy in cytogenetic reporting and prenatal counseling, the identification of a structurally abnormal or small Y chromosome, either alone or in the presence of 45,X colonies, should be followed immediately by confirmatory molecular cytogenetic investigations as well as by ultrasound determination of the phenotypic sex of the fetus.
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Affiliation(s)
- H Bruyère
- Department of Pathology and Laboratory Medicine, Vancouver University of British Columbia, Vancouver, BC, Canada.
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Farrell SA, Sajoo A, Maybury D, Speevak MD. Pure partial trisomy of 2q22-q23 secondary to a paternally inherited direct insertion: a rare duplication. Clin Genet 2003; 64:255-7. [PMID: 12919142 DOI: 10.1034/j.1399-0004.2003.00120.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Abstract
We report a case of a child with features of Down syndrome (DS) but with an atypical karyotype. Initial chromosome analysis was 46,XX,dup(21q).ish 21(wcp21+). The father's chromosomes were normal. However, the mother was found to have mosaicism for a pericentric inversion of chromosome 21 (19/30 cells). The revised chromosome result of the child was 46,XX,rec(21)dup(21q)inv(21)(p12q21.1)mat. A literature review of similar cases (hereafter referred to as rec dup(21q)) was conducted to aid counselling about recurrence risks and the prognosis for this child. All previous reports of rec dup(21q) were secondary to a maternal pericentric inversion. Male carriers did not seem to be at risk of having offspring with the rec dup(21q), although the number of male carriers was limited. In those with rec dup(21q), the risk of congenital heart disease was similar to that of trisomy 21. In reported cases, the facial appearance was suggestive of Down syndrome but perhaps less striking. Although the data are limited, there is an indication the developmental disabilities and short stature are milder in those with rec dup(21q) compared to trisomy 21. These observations promote the concept that the region of chromosome 21 proximal to the duplication contains genetic information contributing to the expression of some features of Down syndrome.
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Affiliation(s)
- S J Lazzaro
- Division of Genetics, The Department of Laboratory Medicine, The Credit Valley Hospital, 2200 Eglinton Ave. W, Mississauga, Ontario, L5M 2N1, Canada.
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Abstract
Chemotherapeutic treatment of tumor cells leads either to tumor cell death (usually by apoptosis) or to the formation of drug-resistant subpopulations. Known mechanisms of cancer cell drug resistance include gene amplification and increased expression of drug transporters. On the other hand, normal cells survive many forms of chemotherapy with minimal damage probably because of their capacity for growth arrest and stringent control of apoptosis. Microcell hybrids between B78 (murine melanoma) and HSF5 (normal human fibroblasts) were analyzed to identify a new human chromosomal region involved in the promotion of drug-induced growth arrest and suppression of apoptosis. In these hybrids, the presence of human chromosome 3 was strongly associated with suppression of apoptosis via G1 and G2 growth arrest during exposure to the antimetabolite N-phosphonoacetyl-L-aspartate (PALA), suggesting that a gene(s) on chromosome 3 serves an antiproliferative role in a drug-responsive growth arrest pathway.
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Affiliation(s)
- M D Speevak
- Department of Biochemistry, Faculty of Medicine, University of Ottawa, Ontario, Canada
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Abstract
Whole-cell fusion between zebrafish fibroblast-like ZF4 cells and mouse B78 melanoma cells resulted in hybrids containing one or a few zebrafish chromosome segments in a murine chromosomal background. Fluorescence in situ hybridization to hybrid cell metaphases with a zebrafish genomic DNA probe revealed that many hybrids contained zebrafish chromosome segments that were either inserted or translocated to a mouse chromosome, whereas other hybrids contained zebrafish chromosomes with no evidence of insertion or translocation. We have assigned hybrids to 17 linkage groups of the genetic map of the zebrafish genome. Our results demonstrate the feasibility of producing somatic cell hybrids between distantly related species. Zebrafish/mouse cell hybrids will provide a useful tool for the physical mapping of the zebrafish genome and for the cloning of genes affected in zebrafish mutants.
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Affiliation(s)
- M Ekker
- Loeb Institute for Medical Research, Ottawa Civic Hospital, Ottawa, Ontario, K1Y 4E9, Canada
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Rajcan-Separovic E, Wang HS, Speevak MD, Janes L, Korneluk RG, Wakasa K, Ikeda JE. Identification of the origin of double minutes in normal human cells by laser-based chromosome microdissection approach. Hum Genet 1995; 96:39-43. [PMID: 7607652 DOI: 10.1007/bf00214184] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Single copies of tiny chromosome fragments, appearing as double minutes, were observed in a high proportion of cells from amniotic fluid cultures of two mothers undergoing prenatal testing because of advanced age. We applied a laser-based chromosome microdissection method to diagnose the origin of the double minutes. The diagnostic procedures consisted of microdissection of double minutes from a single cell, polymerase chain reaction (PCR) amplification of the dissected DNA, and subsequent fluorescence in situ hybridization (FISH) using the PCR products as a probe pool. Metaphase chromosomes from the patients' cells and from a karyotypically normal individual were probed. Using this strategy, we were able to determine that the double minutes originated from the centromere of chromosome 13 or 21 in one case, and from the chromosome 12 centromere in the other. The characterization of such double minutes helps both in the delineation of the nature of these epichromosomal bodies in normal individuals as well as in the clarification of genetic counselling issues.
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Affiliation(s)
- E Rajcan-Separovic
- GenoSPHERE Project, University of Ottawa, Faculty of Medicine, Ontario, Canada
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Speevak MD, Bérubé NG, McGowan-Jordan IJ, Bisson C, Lupton SD, Chevrette M. Construction and analysis of microcell hybrids containing dual selectable tagged human chromosomes. Cytogenet Cell Genet 1995; 69:63-5. [PMID: 7835089 DOI: 10.1159/000133939] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We have constructed a panel of human x murine microcell hybrids containing individual human chromosomes tagged with a dual selectable marker conferring hygromycin B resistance and ganciclovir sensitivity. Over 500 independent microcell hybrids (B78MC) were generated and more than 200 individually isolated. We have identified the human chromosome content of several B78MC hybrids and verified that the majority are responsive to positive and negative selection. Once fully characterized, this panel will be useful in the study of dominant regulators of gene activity, such as tissue specific regulators and tumor suppressor genes.
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Affiliation(s)
- M D Speevak
- Department of Biochemistry, Faculty of Medicine, University of Ottawa, Ontario Canada
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Abstract
In vitro exposure of tumorigenic cell lines to the chemotherapeutic agent PALA (N-(phosphonoacetyl)-L-aspartate) usually results in cell death (shown here to be apoptosis), followed by clonal growth of rare survivors. On the other hand, normal diploid cells respond to PALA by arresting in G1 and G2 of the cell cycle. It was previously suggested that growth control mechanisms might exist to prevent cells from entering S phase under toxic conditions and that genes involved in such mechanisms were mutated or deleted in tumor cells. Interestingly, the tumor suppressor gene p53, a putative G1 control gene, was shown to mediate PALA-induced growth arrest. However, growth arrest occurs in cells that lack wild-type p53, suggesting that other genes are involved as well. To identify these genes, we have generated whole cell hybrids between mouse melanoma and normal human fibroblast cells. At early passage, a whole cell hybrid (BHF12) responds to PALA with growth arrest, while at later passage, the same hybrid undergoes apoptosis. To determine which human chromosomes are required for the PALA-induced growth arrest phenotype, we isolated subclones of the hybrid and tested them for their PALA response. FISH (fluorescence in situ hybridization) and PCR (polymerase chain reaction) amplification have been used to identify the human chromosome content of BHF12 and its subclones. Several human chromosomes, in addition to chromosome 17 (the location of p53), are consistently associated with the growth arrest phenotype.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- M D Speevak
- University of Ottawa, Department of Biochemistry, Faculty of Medicine, ON, Canada
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Bérubé NG, Speevak MD, Chevrette M. Suppression of tumorigenicity of human prostate cancer cells by introduction of human chromosome del(12)(q13). Cancer Res 1994; 54:3077-81. [PMID: 8205520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The introduction of normal chromosomes into tumor cells by microcell fusion-mediated transfer is a powerful technique to identify putative tumor suppressor genes. We have used this approach to independently transfer human chromosomes 3 and 12 into a human prostate cancer cell line, DU 145. We showed that while the extra copy of chromosome 3 had no effect on the in vivo tumorigenicity of these cells, microcell hybrids containing an introduced portion of chromosome 12 (12pter-12q13) exhibited complete suppression of tumorigenicity in athymic nude mice. The presence of a dual selectable marker facilitated the selection for cells having segregated del(12)(q13). Loss of this fragment in three different clones led to reexpression of the malignant phenotype. These results demonstrate that one or more genes on human chromosome 12 function as tumor suppressors of prostate carcinogenesis.
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Affiliation(s)
- N G Bérubé
- Department of Biochemistry, Faculty of Medicine, University of Ottawa, Ontario, Canada
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McGowan-Jordan IJ, Speevak MD, Blakey D, Chevrette M. Suppression of tumorigenicity in human teratocarcinoma cell line PA-1 by introduction of chromosome 4. Cancer Res 1994; 54:2568-72. [PMID: 8168081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Teratocarcinomas are tumors that develop spontaneously in the gonads and usually contain a rapidly dividing, undifferentiated stem cell population. Immature ovarian teratocarcinomas are highly malignant with only 30-60% of patients surviving for 2 years after diagnosis. We have used microcell fusion to introduce individually tagged normal human chromosomes into the PA-1 human teratocarcinoma cell line. Introduction of human chromosome 4 caused a cell morphology in culture and suppressed PA-1 tumorigenicity in nude mice, whereas addition of portions of either chromosome 7 or 12 had no effect on the cell phenotype. The PA-1 cell line regained its tumorigenicity when the tagged chromosome 4 was lost under negative selection. We conclude that there is a putative tumor suppressor gene on human chromosome 4 whose expression interferes with the tumorigenicity of PA-1 cells.
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Affiliation(s)
- I J McGowan-Jordan
- Department of Biochemistry, Faculty of Medicine, University of Ottawa, Ontario, Canada
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Abstract
We report on a stillborn male infant with a mosaic ring 13 karyotype (45,XY,-13/46,XY,-13,+r(13)) with apparent aprosencephaly and clinical findings similar to those reported previously in the XK-aprosencephaly syndrome. Findings of patients with r(13) are often similar to those seen in individuals with del(13q). This case was unusual because of the presence of aprosencephaly, although brain malformations such as arhinencephaly and cerebellar hypoplasia are present in at least one-half of reported patients with 13q-. The overlap between these syndromes suggests a possible chromosomal model of the XK-aprosencephaly syndrome.
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Affiliation(s)
- C L Goldsmith
- Division of Genetics, Children's Hospital of Eastern Ontario, Ottawa, Canada
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