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A complex karyotype in an atypical teratoid/rhabdoid tumor: case report and review of the literature

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Abstract

Atypical teratoid/rhabdoid tumor (AT/RT) is a highly aggressive and uncommon neoplasm of the central nervous system that usually occurs in children less than 2 years of age. It is characterized by deletions and/or mutations of the INI1 tumor suppressor gene located in chromosome band 22q11.2. We performed cytogenetic and molecular studies of an AT/RT on a 15-month-old boy. The tumor showed a complex karyotype with one cell line showing monosomy 22 and another near-tetraploid one with additional chromosomal abnormalities, involving chromosomes 2, 3, 5, 6, and Y, which had not been previously described. Sequence analysis of the tumor did not identify mutations of the INI1 gene. The karyotypic evolution observed in this tumor suggests that INI1 has an epigenetic role in the maintenance of genome integrity by affecting genes, which produces mitotic defects and polyploidy. Finally, this case is the first to support the theory that loss of INI1 could induce the chromosomal instability that might be responsible for the genesis of this tumor.

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Acknowledgments

We would like to thank the clinicians of our health center for providing the patient’s sample.

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Authors and Affiliations

  1. Cytogenetics Laboratory, Genetics Department, Garrahan Pediatrics Hospital, Combate de los Pozos 1881, 1245, Buenos Aires, Argentina

    Mariela C. Coccé & Marta S. Gallego

  2. Pathology Department, Garrahan Pediatrics Hospital, Combate de los Pozos 1881, 1245, Buenos Aires, Argentina

    Fabiana Lubieniecki

  3. Department of Pediatric Hematology and Oncology, University Medical Center Hamburg-Eppendorf, Martinistrasse 52, 20246, Hamburg, Germany

    Uwe Kordes

  4. Hemato-Oncology Department, Garrahan Pediatrics Hospital, Combate de los Pozos 1881, 1245, Buenos Aires, Argentina

    Daniel Alderete

Authors
  1. Mariela C. Coccé
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  2. Fabiana Lubieniecki
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  3. Uwe Kordes
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  4. Daniel Alderete
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  5. Marta S. Gallego
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Correspondence to Mariela C. Coccé.

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Coccé, M.C., Lubieniecki, F., Kordes, U. et al. A complex karyotype in an atypical teratoid/rhabdoid tumor: case report and review of the literature. J Neurooncol 104, 375–380 (2011). https://doi.org/10.1007/s11060-010-0478-0

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  • DOI: https://doi.org/10.1007/s11060-010-0478-0

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