Volume 126, Issue 10 pp. 2362-2372
Cancer Genetics

Allelic loss of chromosomes 8 and 19 in MENX-associated rat pheochromocytoma

Alena Shyla

Alena Shyla

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

Institute of Radiation Biology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Gabriele Hölzlwimmer

Gabriele Hölzlwimmer

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Julia Calzada-Wack

Julia Calzada-Wack

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Karin Bink

Karin Bink

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Oleg Tischenko

Oleg Tischenko

Institute of Radiation Protection, Medical Physics Group, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Marie-Noëlle Guilly

Marie-Noëlle Guilly

CEA, DSV, IRCM, SREIT, Laboratoire de Cancérologie Expérimentale, BP6, France

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Sylvie Chevillard

Sylvie Chevillard

CEA, DSV, IRCM, SREIT, Laboratoire de Cancérologie Expérimentale, BP6, France

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Elenore Samson

Elenore Samson

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Jochen Graw

Jochen Graw

Institute of Developmental Genetics, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Michael J. Atkinson

Michael J. Atkinson

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

Institute of Radiation Biology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

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Natalia S. Pellegata

Corresponding Author

Natalia S. Pellegata

Institute of Pathology, Helmholtz Zentrum München-German Research Center for Environment and Health, Neuherberg, Germany

Fax: +49-89-3187-3360.

Helmholtz Zentrum München-German Research Center for Environment and Health, Institute of Pathology, Ingolstädter Landstraβe 1, D-85764 Neuherberg, GermanySearch for more papers by this author
First published: 28 October 2009
Citations: 7

Abstract

Pheochromocytomas are neoplasias of neural crest origin that arise from the chromaffin cells of the adrenal medulla. Pheochromocytomas arise with complete penetrance in rats homozygous for a germ-line frameshift mutation of Cdkn1b, encoding the cell cycle inhibitor p27KIP1 (MENX syndrome). We performed a genome-wide scan for allelic imbalance comparing 20 rat pheochromocytoma DNAs with normal rat DNA to better understand the pathobiology of the tumors and to correlate the findings with human pheochromocytoma. We identified allelic imbalance (AI) at candidate regions on rat chromosomes 8 and 19. Interestingly, the regions often lost in rat tumors are syntenic to regions involved in human pheochromocytomas. Fluorescence in situ hybridization analysis further validated the AI data. Sdhd and Rassf1a were analyzed in detail as they map to regions of AI on chromosome 8 and their homologues are implicated in human pheochromocytoma: we found no genetic mutations nor decreased expression. We also analyzed additional candidate genes, that is, rat homologues of genes predisposing to human pheochromocytoma and known tumor-suppressor genes, but we found no AI. In contrast, we observed frequent overexpression of Cdkn2a and Cdkn2c, encoding the cell cycle inhibitors p16INK4a and p18INK4c, respectively. The relative small number of allelic changes we found in rat pheochromocytoma might be related to their nonmalignant status and losses at chromosomes 8 and 19 are events that precede malignancy. Because of the high concordance of affected loci between rat and human tumors, studies of the MENX-associated pheochromocytomas should facilitate the identification of novel candidate genes implicated in their human counterpart.

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