title: sFRP1 promoter methylation is associated with persistent Philadelphia chromosome in chronic myeloid leukemia.
abstract: Epigenetic silencing of sFRP genes has been shown to lead to constitutive activation of the canonical Wnt-signaling pathway. The first description of deregulated Wnt-signaling activation in a hematological malignancy was reported in chronic myeloid leukemia (CML). To investigate whether epigenetic silencing of sFRP is responsible for the observed Wnt activation in CML, we studied the methylation and mutational status of the sFRP1 promoter in 48 chronic phase CML patients. Of the 48 CML patients 41 were shown to be unmethylated, 6 patients hemi-methylated and 1 patient fully methylated at the sFRP1 promoter. Albeit observed infrequently in chronic phase CML, sFRP1 promoter methylation correlated with primary cytogenetic resistance to imatinib mesylate. sFRP1 promoter methylation may indicate a genetically more unstable form of disease resistant to therapy and provide a key biological difference in therapy resistant patients, in addition to a possible mechanism for the observed activation of canonical Wnt signaling in CML.
authors.affiliation: Department of Medical Biology and Genetics, Dokuz Eylul University, Faculty of Medicine, Inciralti, Izmir, Turkey.
authors.forename: Melek
authors.initials: M
authors.lastname: Pehlivan
authors.forename: Zeynep
authors.initials: Z
authors.lastname: Sercan
authors.forename: Hakki Ogun
authors.initials: HO
authors.lastname: Sercan
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D019175:DNA Methylation; D019008:Drug Resistance, Neoplasm; D005260:Female; D020868:Gene Silencing; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics / Q000378:metabolism*; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D008875:Middle Aged; D010677:Philadelphia Chromosome; D011401:Promoter Regions, Genetic; D015398:Signal Transduction / Q000235:genetics; D051153:Wnt Proteins / Q000235:genetics / Q000378:metabolism; D000094742:Secreted Frizzled-Related Proteins
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D051153:Wnt Proteins; C117636:SFRP1 protein, human; D000094742:Secreted Frizzled-Related Proteins