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An infertile azoospermic male with 45,X karyotype and a unique complex (Y;14); (Y;22) translocation: cytogenetic and molecular characterization. J Assist Reprod Genet 2018; 35:1503-1508. [PMID: 29860576 DOI: 10.1007/s10815-018-1211-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2017] [Accepted: 05/10/2018] [Indexed: 10/14/2022] Open
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Amaro A, Mafra FA, Valada Pane CE, Kulikowski LD, Bianco B, Barbosa CP, Christofolini DM. 45,X karyotype in an infertile man: how is this possible? Urol Int 2014; 94:488-90. [PMID: 25170625 DOI: 10.1159/000365010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 06/02/2014] [Indexed: 11/19/2022]
Abstract
The case was male, 32 years old, with a nonobstructive azoospermia diagnosis and an initial 45,X karyotype. We evaluated by classical cytogenetic methods, C and NOR banding, fluorescent in situ hybridization, and polymerase chain reaction investigations. After investigation, we found the following karyotype: 45,X,dic(Y;22)(q11.223;p11.2). This investigation contributes to our understanding of how chromosome rearrangements can influence fertility processes and how important it is to perform a cytogenetic analysis in infertility cases.
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Affiliation(s)
- Aline Amaro
- Human Reproduction and Genetics Center, Faculdade de Medicina do ABC, Santo André, Brazil
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Breman AM, Ramocki MB, Kang SHL, Williams M, Freedenberg D, Patel A, Bader PI, Cheung SW. MECP2 duplications in six patients with complex sex chromosome rearrangements. Eur J Hum Genet 2010; 19:409-15. [PMID: 21119712 DOI: 10.1038/ejhg.2010.195] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Duplications of the Xq28 chromosome region resulting in functional disomy are associated with a distinct clinical phenotype characterized by infantile hypotonia, severe developmental delay, progressive neurological impairment, absent speech, and proneness to infections. Increased expression of the dosage-sensitive MECP2 gene is considered responsible for the severe neurological impairments observed in affected individuals. Although cytogenetically visible duplications of Xq28 are well documented in the published literature, recent advances using array comparative genomic hybridization (CGH) led to the detection of an increasing number of microduplications spanning MECP2. In rare cases, duplication results from intrachromosomal rearrangement between the X and Y chromosomes. We report six cases with sex chromosome rearrangements involving duplication of MECP2. Cases 1-4 are unbalanced rearrangements between X and Y, resulting in MECP2 duplication. The additional Xq material was translocated to Yp in three cases (cases 1-3), and to the heterochromatic region of Yq12 in one case (case 4). Cases 5 and 6 were identified by array CGH to have a loss in copy number at Xp and a gain in copy number at Xq28 involving the MECP2 gene. In both cases, fluorescent in situ hybridization (FISH) analysis revealed a recombinant X chromosome containing the duplicated material from Xq28 on Xp, resulting from a maternal pericentric inversion. These cases add to a growing number of MECP2 duplications that have been detected by array CGH, while demonstrating the value of confirmatory chromosome and FISH studies for the localization of the duplicated material and the identification of complex rearrangements.
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Affiliation(s)
- Amy M Breman
- Medical Genetics Laboratories, Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
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Gatta V, Antonucci I, Morizio E, Palka C, Fischetto R, Mokini V, Tumini S, Calabrese G, Stuppia L. Identification and characterization of different SHOX gene deletions in patients with Leri-Weill dyschondrosteosys by MLPA assay. J Hum Genet 2006; 52:21-27. [PMID: 17091221 DOI: 10.1007/s10038-006-0074-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2006] [Accepted: 09/21/2006] [Indexed: 10/23/2022]
Abstract
Deletions of the SHOX gene (Xp22-Yp11.3) are associated with Leri-Weill dyschondrosteosys (LWD) and idiopathic short stature. It has been estimated that SHOX deletions occur in 1,000-2,000 individuals in the total population, suggesting that this alteration should be investigated in all cases with unexplained short stature. SHOX deletions are currently investigated using fluorescence in situ hybridization (FISH) or molecular analysis of intragenic CA repeats. However, both techniques show some limitations. In the present study, the use of the multiple ligation probe amplification (MLPA) assay for the identification and characterization of SHOX deletions in 15 LWD patients, 3 of which carriers of chromosome abnormalities involving the SHOX gene, is reported. MLPA analysis demonstrated the heterozygous deletion of SHOX in seven patients (46.6%), disclosing the presence of two different proximal breakpoints. In patients with abnormal karyotype, MLPA analysis was able to identify the chromosomal rearrangement, showing, in addition to the SHOX deletions, the gain or loss of other genes mapped on the X and Y chromosomes. Since MLPA analysis can be carried out on a simple buccal swab, avoiding invasive peripheral blood collection, this technique represents a fast, simple and high throughput approach in the screening of SHOX deletions, able to provide more information as compared to FISH and microsatellite analysis.
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Affiliation(s)
- Valentina Gatta
- Department of Biomedical Sciences and Aging Research Center, Ce.S.I., G. d'Annunzio University Foundation, Via dei Vestini 35, Chieti-Pescara, 66013, Italy
| | - Ivana Antonucci
- Department of Biomedical Sciences and Aging Research Center, Ce.S.I., G. d'Annunzio University Foundation, Via dei Vestini 35, Chieti-Pescara, 66013, Italy
| | | | - Chiara Palka
- IRCCS-CSS San Giovanni Rotondo and CSS-Mendel Rome, Rome, Italy
| | - Rita Fischetto
- Azienda Ospedaliera ''Di Venere'' e ''Giovanni XXIII'', Sezione di Genetica Medica, Bari, Italy
| | - Vahe Mokini
- Service of Medical Genetics, University Hospital Center "Mother Theresa", Tirana, Albania
| | - Stefano Tumini
- Dipartimento di Pediatria e Ginecologia, Università "G D'Annunzio", Chieti, Italy
| | - Giuseppe Calabrese
- Department of Biomedical Sciences and Aging Research Center, Ce.S.I., G. d'Annunzio University Foundation, Via dei Vestini 35, Chieti-Pescara, 66013, Italy
- Service of Human Genetics, Pescara Hospital, Pescara, Italy
| | - Liborio Stuppia
- Department of Biomedical Sciences and Aging Research Center, Ce.S.I., G. d'Annunzio University Foundation, Via dei Vestini 35, Chieti-Pescara, 66013, Italy.
- I.T.O.I.-CNR, Bologna, Italy.
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