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High-resolution, dual-platform aCGH analysis reveals frequent HIPK2 amplification and increased expression in pilocytic astrocytomas

Oncogene volume 27, pages 4745–4751 (2008)Cite this article

Abstract

Pilocytic astrocytomas (PAs, WHO grade I) are the most common brain tumors in the pediatric and adolescent population, accounting for approximately one-fifth of central nervous system tumors. Because few consistent molecular alterations have been identified in PAs compared to higher grade gliomas, we performed array comparative genomic hybridization using two independent commercial array platforms. Although whole chromosomal gains and losses were not observed, a 1-Mb amplified region of 7q34 was detected in multiple patient samples using both array platforms. Copy-number gain was confirmed in an independent tumor sample set by quantitative PCR, and this amplification was correlated to both increased mRNA and protein expression of HIPK2, a homeobox-interacting protein kinase associated with malignancy, contained within this locus. Furthermore, overexpression of wild-type HIPK2, but not a kinase-inactive mutant, in a glioma cell line conferred a growth advantage in vitro. Collectively, these results illustrate the power and necessity of implementing high-resolution, multiple-platform genomic analyses to discover small and subtle, but functionally significant, genomic alterations associated with low-grade tumor formation and growth.

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Acknowledgements

HIPK2 plasmids were generously provided by Dr Gabriella D'Orazi (Regina Elena Cancer Institute, Rome Italy).

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Author notes

  1. H Deshmukh, T H Yeh and J Yu: These authors contributed equally to this work.

Authors and Affiliations

  1. Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA

    H Deshmukh, J Yu, M K Sharma, A Perry, M A Watson & R Nagarajan

  2. Department of Neurology, Washington University School of Medicine, St Louis, MO, USA

    T H Yeh & D H Gutmann

  3. Department of Neurosurgery, Washington University School of Medicine, St Louis, MO, USA

    J R Leonard

  4. Department of Neurology, Chang Gung Memorial Hospital and University, Taipei, Taiwan

    T H Yeh

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  1. H Deshmukh
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  2. T H Yeh
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  4. M K Sharma
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  5. A Perry
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Corresponding authors

Correspondence to D H Gutmann or R Nagarajan.

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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc).

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Deshmukh, H., Yeh, T., Yu, J. et al. High-resolution, dual-platform aCGH analysis reveals frequent HIPK2 amplification and increased expression in pilocytic astrocytomas. Oncogene 27, 4745–4751 (2008). https://doi.org/10.1038/onc.2008.110

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