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CpG Island Methylation and Expression of the Secreted Frizzled-Related Protein Gene Family in Chronic Lymphocytic Leukemia

¹ Department of Molecular Virology, Immunology, and Medical Genetics, Division of Human Cancer Genetics, ² Department of Internal Medicine, Division of Hematology and Oncology, The Comprehensive Cancer Center, and ³ Department of Molecular Genetics, The Ohio State University, Columbus, Ohio

Requests for reprints: Christoph Plass, Tzagournis Medical Research Facility 464A, Division of Human Cancer Genetics, The Ohio State University, 420 West 12th Avenue, Columbus, OH 43210. Phone: 614-292-6505; Fax: 614-688-4761; E-mail: Christoph.Plass{at}osumc.edu.

B-cell chronic lymphocytic leukemia (CLL) is characterized by a clonal accumulation of mature neoplastic B cells indicating disruption of apoptosis. Restriction Landmark Genome Scanning was done to identify novel target genes silenced by CpG island methylation in CLL. Secreted frizzled-related protein 4 (SFRP4), a negative regulator of the Wnt signaling pathway, was found to be frequently methylated in CLL samples. Wnt signaling has been shown to control normal apoptotic behavior and is required for normal B-cell development whereas aberrant activation of this pathway has been observed in CLL. We show aberrant DNA methylation and silencing of SFRP4, as well as of additional SFRP family members, in primary CLL samples. Induction of their expression in a dose-dependent manner following treatment with a demethylating agent, 5-aza-2'-deoxycytidine, was shown. Of the five SFRP family members studied in detail, SFRP1 was hypermethylated and down-regulated in all CLL patient samples studied, suggesting that this epigenetic event is a critical step during leukemogenesis. Our results suggest that silencing of SFRPs by CpG island methylation is one possible mechanism contributing to aberrant activation of Wnt signaling pathway in CLL. (Cancer Res 2006; (66)2: 653-8)

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