Methylation and mRNA expression levels of P15, death-associated protein kinase, and suppressor of cytokine signaling-1 genes in multiple myeloma

Abstract

<strong><em>Objective(s):</em></strong> The aim of this study was to investigate the methylation status and mRNA expression levels of P₁₅, death-associated protein kinase (DAPK), and suppressor of cytokine signaling-1 (SOCS₁) genes in multiple myeloma (MM). <br/><strong><em>Materials and Methods:</em></strong> The bone marrow samples of 54 MM patients were collected and the methylation status of the P₁₅, DAPK, and SOCS₁ gene promoter regions was determined by methylation-specific polymerase chain reaction. Automated sequencing technology was used to sequence the amplified products in order to analyze the base methylation sites. mRNA expression levels were determined using real-time fluorescent quantitative polymerase chain reaction . <br/><strong><em>Results:</em></strong> Among the 54 MM patients, the positive methylation rates of the P₁₅, DAPK, and SOCS₁ genes were 27.78%, 18.52%, and 16.67%, respectively. The methylation results were confirmed by sequencing. The positive methylation rates of the P₁₅, DAPK, and SOCS₁ genes showed no correlation with patient gender, age, typing, staging, and grouping (<em>P</em>>0.05). There was no significant difference in the mRNA expression levels of the P₁₅, DAPK, and SOCS₁ genes between the MM patient group and the control group (<em>P</em>>0.05). <br/><strong><em>Conclusions:</em></strong> Aberrant methylation of the P₁₅, DAPK, and SOCS₁ genes exists in MM, and these genes may play certain roles in pathogenesis of MM. There was no significant difference in mRNA expression levels between the methylated group and the non-methylated group, suggesting that these genes are regulated by other mechanisms during their transcription.