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Epigenetic inactivation of RASSF1A candidate tumor suppressor gene at 3p21.3 in brain tumors

Abstract

The human Ras association domain family 1A (RASSF1A) gene, recently isolated from the lung and breast tumor suppressor locus 3p21.3, is highly methylated in primary lung, breast, nasopharyngeal and other tumors, and re-expression of RASSF1A suppresses the growth of several types of cancer cells. Epigenetic inactivation of RASSF1A by promoter hypermethylation is also important in the development of several human cancers. The methylation status of the promoter region of RASSF1A was analysed in primary brain tumors and glioma cell lines by methylation-specific polymerase chain reaction. In primary brain tumors, 25 of 46 (54.3%) gliomas and five of five (100%) medulloblastomas showed RASSF1A methylation. In benign tumors, only one of 10 (10%) schwannomas and two of 12 (16.7%) meningiomas showed RASSF1A methylation. The RASSF1A promoter region was methylated in all four glioma cell lines. RASSF1A was re-expressed in all methylated cell lines after treatment with the demethylating agent 5-aza-2′-deoxycytidine. Methylation of the promoter CpG islands of the RASSF1A may play an important role in the pathogenesis of glioma and medulloblastoma.

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Acknowledgements

We thank Ms Mitsue Maniwa and Ms Mayumi Umemura for technical assistance. This study was partly supported by grants from the Ministry of Education, Science, Sports and Culture, Japan.

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Correspondence to Keishi Horiguchi.

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Horiguchi, K., Tomizawa, Y., Tosaka, M. et al. Epigenetic inactivation of RASSF1A candidate tumor suppressor gene at 3p21.3 in brain tumors. Oncogene 22, 7862–7865 (2003). https://doi.org/10.1038/sj.onc.1207082

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