Journal of Neuro-Oncology

, Volume 73, Issue 2, pp 101–108

CIC, a gene involved in cerebellar development and ErbB signaling, is significantly expressed in medulloblastomas

Laboratory Investigation

Abstract

In children, the majority of brain tumors arise in the cerebellum. Medulloblastomas, the most common of these, are believed to originate from the granule cell lineage. We have recently identified a mammalian gene, capicua (Cic), the ortholog of a Drosophila gene implicated in c-erbB (Egfr) signaling, which is predominantly expressed during mouse granule cell development. Its expression in medulloblastoma is therefore of particular interest. In the present study the expression of human CIC in medulloblastoma was analyzed. In silico SAGE analysis demonstrated that medulloblastomas exhibited the highest level of CIC expression and expression was most common in tumors of the CNS in general. RT-PCR and in situ hybridization verified the expression of CIC in tumor cells, although the level of expression varied between different medulloblastoma subtypes. The expression of CIC did not correlate with other markers, such as neurofilament, GFAP and Mib-1. In postnatally developing cerebellum, in silico analysis and in situ hybridization both indicated a strong correlation between Cic expression and the maturation profile of cerebellar granule cell precursors. Expression of CIC is therefore a feature shared between immature granule cells and the tumors derived from them. Cic has been implicated as a mediator of ErbB signaling and this pathway has been associated with a poor prognosis for medulloblastomas. Therefore, further analysis of the role of Cic is likely to provide valuable insight into the biology of these tumors. Additionally, study of genes such as CIC should provide objective criteria by which, in combination with other markers and clinical data, to categorize these tumors into subgroups that might allow better allocation into specific treatment regimes.

Keywords

capicua cerebellum ErbB HMG medulloblastoma 

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Copyright information

© Springer 2005

Authors and Affiliations

  • Ching-Jung Lee
    • 1
  • Wai-In Chan
    • 2
    • 3
  • Paul J. Scotting
    • 2
  1. 1.EMBL-EBIHinxtonUK
  2. 2.Children’s Brain Tumour Research Centre, Institute of Genetics, Queen’s Medical CentreUniversity of NottinghamNottinghamUK
  3. 3.The Wellcome Trust Sanger InstituteCambridgeUK

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