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Bruno DL, White SM, Ganesamoorthy D, Burgess T, Butler K, Corrie S, Francis D, Hills L, Prabhakara K, Ngo C, Norris F, Oertel R, Pertile MD, Stark Z, Amor DJ, Slater HR. Pathogenic aberrations revealed exclusively by single nucleotide polymorphism (SNP) genotyping data in 5000 samples tested by molecular karyotyping. J Med Genet 2011; 48:831-9. [DOI: 10.1136/jmedgenet-2011-100372] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Prabhakara K, Bruno DL, Padman P, Prasad S, Sudheer Kumar R, Slater HR, Radha Ramadevi A. Prenatal detection of deletion–duplication of chromosome 3 arising from meiotic recombination of a familial pericentric inversion. Prenat Diagn 2008; 28:466-8. [DOI: 10.1002/pd.2005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Prabhakara K, Wyandt HE, Huang XL, Prasad KS, Ramadevi AR. Recurrent proximal 18p monosomy and 18q trisomy in a family with a maternal pericentric inversion of chromosome 18. ACTA ACUST UNITED AC 2004; 47:297-303. [PMID: 15337476 DOI: 10.1016/j.anngen.2004.03.007] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2003] [Accepted: 03/25/2004] [Indexed: 11/29/2022]
Abstract
We report a recurrent partial monosomy of 18p10-->11.2 and proximal partial trisomy of 18q10-->21.3 caused by a maternal pericentric inversion of chromosome 18, involving breakpoints p11.2 and q21q21.3 Based on cytogenetics and FISH analysis, we speculate that the recurrent chromosome abnormality in the proband and in the fetus was the result of a translocation, possibly in a germ cell or germ cell precursor, between the maternal normal 18 and her inverted 18, resulting in maternal germinal mosaicism, i.e. 46,XX,inv(18)/46,XX,t[18;inv(18)][q10;q10]. The unbalanced karyotype of the proband and the fetus is 46,XY,+18,der[18;inv(18)][q10;q10]. To the best of our knowledge, there are no reports of this combination of proximal 18p monosomy and proximal 18q trisomy. The other interesting observation was association of Hirschsprung's disease in the proband.
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Affiliation(s)
- K Prabhakara
- Diagnostics Division, Center for DNA Fingerprinting & Diagnostics, 7-18, ECIL Road, Nacharam, Hyderabad 500076, India
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Shiras A, Bhosale A, Shepal V, Shukla R, Baburao VS, Prabhakara K, Shastry P. A unique model system for tumor progression in GBM comprising two developed human neuro-epithelial cell lines with differential transforming potential and coexpressing neuronal and glial markers. Neoplasia 2004; 5:520-32. [PMID: 14965445 PMCID: PMC1502577 DOI: 10.1016/s1476-5586(03)80036-2] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The molecular mechanisms involved in tumor progression from a low-grade astrocytoma to the most malignant glioblastoma multiforme (GBM) have been hampered due to lack of suitable experimental models. We have established a model of tumor progression comprising of two cell lines derived from the same astrocytoma tumor with a set of features corresponding to low-grade glioma (as in HNGC-1) and high-grade GBM (as in HNGC-2). The HNGC-1 cell line is slow-growing, contact-inhibited, nontumorigenic, and noninvasive, whereas HNGC-2 is a rapidly proliferating, anchorage-independent, highly tumorigenic, and invasive cell line. The proliferation of cell lines is independent of the addition of exogenous growth factors. Interestingly, the HNGC-2 cell line displays a near-haploid karyotype except for a disomy of chromosome 2. The two cell lines express the neuronal precursor and progenitor markers vimentin, nestin, MAP-2, and NFP160, as well as glial differentiation protein S100beta. The HNGC-1 cell line also expresses markers of mature neurons like Tuj1 and GFAP, an astrocytic differentiation marker, hence contributing toward a more morphologically differentiated phenotype with a propensity for neural differentiation in vitro. Additionally, overexpression of epidermal growth factor receptor and c-erbB2, and loss of fibronectin were observed only in the HNGC-2 cell line, implicating the significance of these pathways in tumor progression. This in vitro model system assumes importance in unraveling the cellular and molecular mechanisms in differentiation, transformation, and gliomagenesis.
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Affiliation(s)
- Anjali Shiras
- National Centre for Cell Science, NCCS Complex, Ganeshkhind, Pune, India.
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Prabhakara K, Radha Ramadevi A. Premature centromere division versus C-anaphases in cultures: need for consensus and guidelines. Am J Med Genet A 2004; 124A:331; author reply 332. [PMID: 14708111 DOI: 10.1002/ajmg.a.20310] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Prabhakara K, Angalena R, Ramadevi AR. Familial (9;11)(p22;p15.5)pat translocation and XX sex reversal in a phenotypic boy with cryptorchidism and delayed development. Genet Couns 2004; 15:37-41. [PMID: 15083697] [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] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
We describe a patient with the co-occurrence of a familial 9;11 reciprocal translocation and an XX sex reversal. The patient had cryptorchidism, delayed development, dysmorphic features and attention deficiency hyperactive disorder (ADHD). The proband's karyotype was 46,XX,t(9;11)(p22;p15.5) and he was positive for SRY gene. The father was found to be the carrier of the similar translocation. The co-occurrence of XX sex reversal and autosomal reciprocal translocation has not been described previously. The possible reasons for the manifestation of features other than those found in XX sex reversal is described.
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MESH Headings
- Attention Deficit Disorder with Hyperactivity/complications
- Attention Deficit Disorder with Hyperactivity/genetics
- Child
- Chromosomes, Human, Pair 12/genetics
- Chromosomes, Human, Pair 15/genetics
- Chromosomes, Human, Pair 9/genetics
- Chromosomes, Human, X/genetics
- Cryptorchidism/genetics
- Disorders of Sex Development
- Genes, sry/genetics
- Humans
- Intellectual Disability/complications
- Intellectual Disability/genetics
- Male
- Phenotype
- Translocation, Genetic/genetics
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Affiliation(s)
- K Prabhakara
- Diagnostics Division, Center for DNA Fingerprinting & Diagnostics, Hyderabad 500 076, India
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Mandal AK, Prabhakara K, Reddy ABM, Devi ARR, Panicker SG. Congenital glaucoma associated with 22p+ variant in a dysmorphic child. Indian J Ophthalmol 2003; 51:355-7. [PMID: 14750628] [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: 04/28/2023] Open
Abstract
A case of congenital glaucoma with developmental delay and several dysmorphic features showing 22p+ chromosomal variant is reported.
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Affiliation(s)
- Anil K Mandal
- Jasti V Ramanamma Children's Eye Care Centre, Hyderabad, India.
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Ramadevi AR, Naik U, Dutta U, Prabhakara K. De novo pericentric inversion of chromosome 4, inv(4)(p16q12) in a boy with piebaldism and mental retardation. Am J Med Genet 2002; 113:190-2. [PMID: 12407711 DOI: 10.1002/ajmg.10739] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
An 8-year-old boy who was diagnosed to have piebaldism had moderate growth and mental retardation. Chromosome analysis from peripheral blood showed pericentric inversion 4(p16q12). The inversion was further confirmed by fluorescence in situ hybridization using whole chromosome painting and centromeric probes. Chromosomal analysis of parents revealed de novo inheritance of this inversion. This is the first report of pericentric inversion associated with piebald trait.
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Affiliation(s)
- A Radha Ramadevi
- Diagnostics Division, Center for DNA Fingerprinting and Diagnostics, Hyderabad, India.
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Prabhakara K, Dutta U, Ramadevi AR. Partial 15q22 trisomy due to segregation of maternal 10;15 reciprocal translocation. Indian Pediatr 2002; 39:1050-4. [PMID: 12466578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/27/2023]
Affiliation(s)
- K Prabhakara
- Diagnostics Division, Center for DNA fingerprinting Diagnostics, Hyderabad 500 076, India.
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Ramadevi AR, Prabhakara K, Dutta U. Familial (11;21)(p13;q22)pat balanced reciprocal translocation in a female child with regression of milestones. Ann Genet 2002; 45:13-5. [PMID: 11934384 DOI: 10.1016/s0003-3995(02)01099-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of balanced translocations in the human morphogenesis is difficult to interpret. A balanced reciprocal translocation (BRT) was observed in a female child referred with a history of regression of milestones. The cytogenetic findings by GTG-banding and fluorescence in situ hybridization revealed a BRT involving chromosomes 11p and 21q, i.e. 46,XX, t(11;21)(p13;q22). The father was found to be a carrier of the same BRT. This is the first report of reciprocal translocation involving 11p and 21q. The possible reasons for the manifestation of clinical features in the proband due to inherited BRT are discussed.
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Affiliation(s)
- A Radha Ramadevi
- Diagnostics Division, Center for DNA Fingerprinting & Diagnostics, ECIL Road, Nacharam, Hyderabad 500 076, India.
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Chowdhury MR, Mathur R, Prabhakara K, Singh G, Dubey S, Verma IC. Improved method for study of chromosomes of chorionic villus samples. Indian J Med Res 1996; 104:269-72. [PMID: 8952181] [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: 02/03/2023] Open
Abstract
Chorionic villus sampling (CVS) offers rapid prenatal diagnosis of chromosomal disorders. We evaluated four methods for chromosomal analysis of chorionic villi (three based on direct preparations and one on long-term culture) in order to define a method which would provide good quality metaphases in sufficient numbers. The direct culturing method using synchronisation and dissociation with dispase was as good as long-term culturing. The optimal period of gestation for study was 10-12 wk.
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Affiliation(s)
- M R Chowdhury
- Department of Paediatrics, WHO Collaborating Centre in Genetics All India Institute of Medical Sciences, New Delhi
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Abstract
Hyperthermic induction of chromosomal aberrations was examined in human lymphocytes. For this purpose, whole blood cultures were exposed to an elevated temperature (43 degrees C) at the 46th h of culture initiation, followed by 24 h of recovery. Detailed chromosomal analysis showed significantly higher levels of aberrations as compared to control cultures of the same individuals. These aberrations include breaks, gaps of both chromosome and chromatid type, aneuploidy and high levels of polyploidy. The interesting observation was the occurrence of S-phase premature chromosome condensation (PCC). The S-phase PCC observed here could be due to asynchronous nuclei induced by hyperthermia. A possible interpretation for the occurrence of asynchronous nuclei leading to the induction of S-phase PCC is discussed.
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Affiliation(s)
- K Prabhakara
- Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India
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Affiliation(s)
- K Prabhakara
- Department of Zoology, School of Sciences, Gujarat University, Ahmedabad, India
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Kar B, Prabhakara K, Murthy SK. Inherited deletion of chromosome (21p-) in a child with congenital malformation and psychomotor retardation. Indian Pediatr 1992; 29:929-34. [PMID: 1428153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- B Kar
- Department of Zoology, University School of Sciences, Gujarat University, Ahmedabad
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