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BackgroundPrecursor B-cell acute lymphoblastic leukemia (B-cell ALL) is the most common neoplasmin children and is characterized by genetic and epigenetic aberrations in hematopoietictranscription factor (TF) genes. This study evaluated promoter DNA methylation and aberrantexpression levels of early- and late-acting hematopoietic TF genes homeobox A4 andA5 (HOXA4 and HOXA5), Meis homeobox 1 (MEIS1), T-cell acute lymphocytic leukemia1 (TAL1), and interferon regulatory factors 4 and 8 (IRF4 and IRF8) in pediatric B-cell ALL.MethodsBlood samples of 38 ALL patients and 20 controls were obtained. DNA was treated withsodium bisulfite and DNA methylation level of HOXA4, HOXA5, MEIS1, TAL1, IRF4, and IRF8was assessed using quantitative methylation-specific polymerase chain reaction (PCR).Relative gene expression was measured using quantitative reverse transcription-PCR. ResultsAberrant methylation of TAL1, IRF8, MEIS1, and IRF4 was observed in 26.3%, 7.9%, 5.3%,and 2.6% patients, respectively, but not in controls. HOXA4 and HOXA5 were methylatedin some controls and hypermethylated in 16% and 5% patients, respectively. IRF8, MEIS1,and TAL1 expression was lower in patients than in controls. MEIS1 expression was inverselycorrelated with white blood cell (WBC) count. HOXA4 expression was downregulatedin patients with high risk according to the National Cancer Institute (NCI)classification. TAL1 methylation was slightly elevated in patients aged >9 years and inpatients showing relapse, suggesting its potential prognostic value. ConclusionAberrant methylation and expression of the selected hematopoietic genes were correlatedwith demographic/clinical prognostic factors of pediatric ALL, such as age, WBCcount, and NCI risk classification.

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