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Investigation of MGMT and DAPK1 methylation patterns in diffuse large B-cell lymphoma using allelic MSP-pyrosequencing

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The tumor suppressor genes MGMT and DAPK1 become methylated in several cancers including diffuse large B-cell lymphoma (DLBCL). However, allelic methylation patterns have not been investigated in DLBCL. We developed a fast and cost-efficient method for the analysis of allelic methylation based on pyrosequencing of methylation specific PCR (MSP) products including a SNP. Allelic methylation patterns were reliably analyzed in standards of known allelic methylation status even when diluted in unmethylated DNA to below 1% methylation. When studying 148 DLBCL patients MGMT and DAPK1 methylation was observed in 19% and 89%, respectively, and among methylated and heterozygous patients 29% and 55%, respectively, were biallelically methylated. An association between the T-allele of the rs16906252 SNP and MGMT methylation was observed (p-value=0.04), and DAPK1 methylation of the A-allele was associated with shorter overall survival (p-value=0.006). In future cancer research allelic MSP-pyrosequencing may be used to study a wide range of other loci.
OriginalsprogEngelsk
TidsskriftScientific Reports
Vol/bind3
Sider (fra-til)2789
ISSN2045-2322
DOI
StatusUdgivet - 2013

ID: 41370334