Abstract
Medulloblastoma is a highly invasive malignancy of the cerebellum (WHO grade IV) with a high tendency to metastasize via cerebrospinal fluid (CSF) pathways, and the most common malignant brain tumor in childhood. At present, multiple molecular dysfunctions are known to be responsible for medulloblastoma formation, including aberrant activation of the Sonic Hedgehog and Wingless signaling pathways. Nonetheless, recent observations that defects in DNA repair pathways can lead to genomic instability in neural progenitor cells and result in medulloblastoma development have underscored the importance of further genome surveillance. Moreover, recent studies evaluating the role of mutational inactivation of DNA repair genes in the development of medulloblastoma indicate that changes within genes coding such proteins as MRE11, RAD50, and NBN, forming the MRN protein complex, seem to be particularly important. Among these, the germ-line mutations detected in pediatric patients with medulloblastoma were found most frequently in the NBN gene, which codes for a protein that is an essential component of the MRN complex. All the mutations had a heterozygous status and were associated with the classic type of this tumor. Epidemiological data show that the NBN gene can be considered a susceptibility factor for cancer development. This is supported by both the fact that the NBN protein participates in the cellular response to DNA damage, and that medulloblastoma is the most frequently reported solid tumor in Nijmegen breakage syndrome patients, who are at increased risk of developing different types of malignancies. This chapter will focus on new findings implicating NBN in medulloblastoma, which have given new insight into signaling pathways involved in the development of this disease.
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Chrzanowska, K.H., Trubicka, J., Ciara, E. (2012). Pediatric Medulloblastoma: The Role of Heterozygous Germ-Line Mutations in the NBN Gene. In: Hayat, M. (eds) Pediatric Cancer, Volume 3. Pediatric Cancer, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-4528-5_13
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DOI: https://doi.org/10.1007/978-94-007-4528-5_13
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