Epigenetic methylation status of P16, MGMT and SPOCK2 in diffuse Large B cell lymphoma


  • Lailatul Jalilah
  • Aziah Ismail
  • Norlelawati A. Talib
  • Naznin Muhammad
  • Faezahtul Arbaeyah Hussain
  • Norafiza Zainuddin




Introduction: Epigenetic methylation has been implicated in the pathogenesis of diffuse large B cell lymphoma (DLBCL). This study investigated the methylation status of p16, MGMT and SPOCK2. Aberrantly methylated p16 and MGMT have been linked to DLBCL, but not SPOCK2. p16 inhibits cyclin-dependent kinase, which results in retinoblastoma phosphorylation and blockage of cell cycle at G1 phase. MGMT removes alkyl adduct at O 6 - guanine, thus preventing lethal cross-links. SPOCK2, an extracellular chondroitin and heparin sulfate proteoglycans, abolishes the inhibition of membrane-type 1-matrix metalloproteinase which might enhance the angiogenesis. The absence of SPOCK2 methylation was therefore hypothesized in the majority of cases in this study. Methods: Extracted DNA from 88 formalin-fixed paraffin-embedded (FFPE) tissues of DLBCL were subjected to bisulfite conversion followed by methylation-specific PCR (MSP) analysis for p16, MGMT and SPOCK2 methylation. p16 methylation was also quantified in 16 samples through pyrosequencing assay. Results: p16 methylation was observed in 65/88 (74%) samples by MSP. Pyrosequencing detected p16 methylation in all 16 samples ranging from 18% to 81%. MGMT methylation was detected in all 88 (100%) cases. Methylated SPOCK2 was found in 83 (94.3%) samples. There was a significant association between p16 methylation status with patients above 50 years of age (p= 0.04). Conclusions: These preliminary discoveries may serve as a good platform in order to gain a comprehensive overview on the epigenetics contribution in the pathogenesis of DLBCL. Pyrosequencing is a robust tool in detecting and quantifying methylation.


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How to Cite

Jalilah, L. ., Ismail, A. ., A. Talib, N. ., Muhammad, N. ., Hussain, F. A. ., & Zainuddin, N. (2016). Epigenetic methylation status of P16, MGMT and SPOCK2 in diffuse Large B cell lymphoma. IIUM Medical Journal Malaysia, 15(1). https://doi.org/10.31436/imjm.v15i1.1218



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