Increased DNA methyltransferase expression in leukaemia

Leukemia
J R MelkiS J Clark

Abstract

Aberrant DNA methylation has been observed consistently in many human tumours, in particular in the CpG islands of tumour suppressor genes, but the underlying mechanism of these changes remains unclear. To determine whether DNA methyltransferase expression is increased in leukaemia, we developed a standardised competitive RT-PCR assay to measure the level of DNA methyltransferase transcripts. Using this assay on bone marrow RNA samples from 12 patients with acute leukaemia, we observed a 4.4-fold mean increase in the level of DNA methyltransferase mRNA compared with normal bone marrow. These results support but do not prove the hypothesis that an increase in DNA methyltransferase activity is associated with malignant haematological diseases and may constitute a key step in carcinogenesis.

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