Repetitive genomic elements and overall DNA methylation changes in acute myeloid and childhood B-cell lymphoblastic leukemia patients

被引：0

作者：

Mateusz Bujko

Ewa Musialik

Rafał Olbromski

Marta Przestrzelska

Marta Libura

Anna Pastwińska

Przemysław Juszczyński

Lech Zwierzchowski

Paweł Baranowski

Janusz Aleksander Siedlecki

机构：

[1] Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology,Department of Molecular and Translational Oncology

[2] Institute of Genetics and Animal Breeding,Department of Molecular Biology

[3] The Medical University of Warsaw,Department of Hematology, Oncology and Internal Diseases

[4] Institute of Hematology and Transfusion Medicine,Department of Diagnostic Hematology

[5] Marian Weiss Memorial Mazovia Rehabilitation Center,Neuroorthopedic Department

来源：

International Journal of Hematology | 2014年 / 100卷

关键词：

DNA methylation; LINE-1; ALU; AML; B-cell ALL; Leukemia;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Aberrant epigenetic regulation is a hallmark of neoplastic cells. Increased DNA methylation of individual genes’ promoter regions and decreases in overall DNA methylation level are both generally observed in cancer. In solid tumors, this global DNA hypomethylation is related to reduced methylation of repeated DNA elements (REs) and contributes to genome instability. The aim of the present study was to assess methylation level of LINE-1 and ALU REs and total 5-methylcytosine (5metC) content in adult acute myeloid leukemia (AML) (n = 58), childhood B-cell acute lymphoblastic leukemia (ALL) (n = 32), as the most frequent acute leukemias in two age categories and in normal adult bone marrow and children’s blood samples. DNA pyrosequencing and ELISA assays were used, respectively. Global DNA hypomethylation was not observed in leukemia patients. Results revealed higher DNA methylation of LINE-1 in AML and ALL samples compared to corresponding normal controls. Elevated methylation of ALU and overall 5metC level were also observed in B-cell ALL patients. Differences of REs and global DNA methylation between AML cytogenetic-risk groups were observed, with the lowest methylation levels in intermediate-risk/cytogenetically normal patients. B-cell ALL is characterized by the highest DNA methylation level compared to AML and controls and overall DNA methylation is correlated with leukocyte count.

引用

页码：79 / 87

页数：8

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