Repetitive DNA hypomethylation in the advanced phase of chronic myeloid leukemia.
Repetitive elements are heavily methylated in normal tissues, but hypomethylated in malignant tissues, driving the global genomic hypomethylation found in cancer. This hypomethylation results in chromosomal instability, a well-characterized feature of the advanced phases of chronic myeloid leukemia (CML). We investigated methylation changes of DNA repetitive elements (LINE1, Alu, Satellite-alpha and Satellite-2) during the progression of CML from chronic phase (CP) to blast crisis (BC). CP-CML samples were significantly more hypomethylated for all repetitive sequences compared with normal samples. Furthermore, a more profound level of hypomethylation was observed among BC samples compared with CP samples. Our data suggest that repetitive DNA hypomethylation are closely associated with CML progression.
Roman-Gomez
Jose
J
Hematology Department, Reina Sofia Hospital, Avda. Menendez Pidal s/n, 14004 Cordoba, Spain. peperosa@teleline.es
Jimenez-Velasco
Antonio
A
Agirre
Xabier
X
Castillejo
Juan A
JA
Navarro
German
G
San Jose-Eneriz
Edurne
E
Garate
Leire
L
Cordeu
Lucia
L
Cervantes
Francisco
F
Prosper
Felipe
F
Heiniger
Anabel
A
Torres
Antonio
A
D020087:Alu Elements; D001752:Blast Crisis / Q000235:genetics; D019175:DNA Methylation; D004276:DNA, Satellite; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics*; D015466:Leukemia, Myeloid, Chronic-Phase / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid
D004276:DNA, Satellite