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- W2169228181 abstract "Retinoblastoma protein-interacting zinc finger, RIZ1, is a tumor suppressor gene that is inactivated in various solid tumors. However, the role of the RIZ1 gene has not been well examined in adult acute lymphoblastic leukemia (ALL). We analyzed the expression and promoter methylation status of the RIZ1 gene in patients with newly diagnosed ALL by quantitative real-time reverse transcription polymerase chain reaction (PCR) and methylation-specific PCR, respectively. RIZ1 expression in 67 cases of ALL (mean 1.043) was decreased compared with that in normal bone marrow (mean 1.471) (p = 0.030). Methylation was detected in 11 of 71 patients (15.5%) but not in healthy controls. Methylation was associated with decreased RIZ1 expression in many ALL cases examined, but this was not statistically significant. In T-ALL, RIZ1 methylation was more frequent (63.6%) than in B-ALL (6.7%) (p < 0.0001) and the decrease of RIZ1 expression was more significant than in B-ALL (p = 0.045). 5-Aza-2′-deoxycytidine treatment of MOLT-4 cells with RIZ1 methylation induced demethylation of RIZ1 and restoration of expression. Forced RIZ1 expression in T-ALL cell lines suppressed cell growth accompanied by G2/M arrest and apoptosis. No mutations were found by PCR-single strand conformation polymorphism analysis in hotspots of the gene. These results suggest that RIZ1 is inactivated in adult ALL, and this inactivation is associated with methylation in T-ALL." @default.
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- W2169228181 date "2012-03-13" @default.
- W2169228181 modified "2023-10-04" @default.
- W2169228181 title "Aberrant methylation and decreased expression of the<i>RIZ1</i>gene are frequent in adult acute lymphoblastic leukemia of T-cell phenotype" @default.
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- W2169228181 doi "https://doi.org/10.3109/10428194.2012.663086" @default.
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