Detection of MYD88 L265P mutation by real-time allele-specific oligonucleotide polymerase chain reaction

Appl Immunohistochem Mol Morphol. 2014 Nov-Dec;22(10):768-73. doi: 10.1097/PAI.0000000000000020.

Abstract

MYD88 L265P mutation has been reported in ∼90% of Waldenström's Macroglobulinemia (WM) patients and immunoglobulin M (IgM) monoclonal gammopathies of uncertain significance (MGUS), as well as in some cases of lymphoma and chronic lymphocytic leukemia. The present study aimed to develop a real-time allele-specific oligonucleotide PCR (ASO-RQ-PCR) to detect the MYD88 L265P mutation. We first evaluated the reproducibility and sensitivity of the technique with a diluting experiment of a previously known positive sample. Then, we evaluated the applicability of the methodology by analyzing 30 selected patients (10 asymptomatic WM, 10 symptomatic WM, and 10 IgM MGUS) as well as 10 healthy donors. The quantitative ASO-PCR assay could detect the MYD88 L265P mutation at a dilution of 0.25%, showing an inverse correlation between the tumor cell percentage and the cycle threshold (CT) value, thus allowing for tumor burden quantitation. In addition, mutated cases were distinguished from the unmutated by >10 cycles of difference between CTs. To sum up, ASO-RQ-PCR is an inexpensive, robust, and optimized method for the detection of MYD88 L265P mutation, which could be considered as a useful molecular tool during the diagnostic work-up of B-cell lymphoproliferative disorders.

Publication types

  • Evaluation Study

MeSH terms

  • Alleles
  • DNA Mutational Analysis / methods*
  • Diagnosis, Differential
  • Humans
  • Immunoglobulin M / metabolism
  • Monoclonal Gammopathy of Undetermined Significance / diagnosis*
  • Monoclonal Gammopathy of Undetermined Significance / genetics
  • Mutation / genetics*
  • Myeloid Differentiation Factor 88 / genetics*
  • Real-Time Polymerase Chain Reaction / methods*
  • Reproducibility of Results
  • Sensitivity and Specificity
  • Tumor Burden
  • Waldenstrom Macroglobulinemia / diagnosis*
  • Waldenstrom Macroglobulinemia / genetics

Substances

  • Immunoglobulin M
  • Myeloid Differentiation Factor 88