FGFR1 over-expression in primary rhabdomyosarcoma tumors is associated with hypomethylation of a 5′ CpG Island and abnormal expression of the AKT1, NOG, and BMP4 genes
✍ Scribed by Myriam Goldstein; Isaac Meller; Avi Orr-Urtreger
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 409 KB
- Volume
- 46
- Category
- Article
- ISSN
- 1045-2257
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✦ Synopsis
Abstract
Rhabdomyosarcoma (RMS), the most common pediatric soft tissue sarcoma likely results from abnormal proliferation and differentiation during skeletal myogenesis. Multiple genetic alterations are associated with the three RMS histopathological subtypes, embryonal, alveolar, and pleomorphic adult variant. Recently, we reported the novel amplification of the FGFR____1 gene in a RMS tumor. The involvement of FGFR____1 in RMS was now further studied in primary tumors and RMS cell lines by mutation screening, quantitative RNA expression, and methylation analyses. No mutation was found by DHPLC and sequencing of the entire FGFR____1 coding sequence and exon–intron boundaries. However, FGFR____1 over‐expression was detected in all primary RMS tumors and cell lines tested. A hypomethylation of a CpG island upstream to FGFR____1 exon 1 was identified in the primary RMS tumors, using sodium bisulfite modification method, suggesting a molecular mechanism to FGFR____1 over‐expression. Expression analysis of additional genes, AKT____1, NOG and its antagonist BMP____4, which interact downstream to FGFR____1, demonstrated expression differences between primary RMS tumors and normal skeletal muscles. Our data suggest an important role for FGFR____1 and FGFR____1‐downstream genes in RMS tumorigenesis and a possible association with the deregulation of proliferation and differentiation of skeletal myoblasts in RMS. © 2007 Wiley‐Liss, Inc.