title: Rapid detection of DNMT3A R882 mutations in hematologic malignancies using a novel bead-based suspension assay with BNA(NC) probes.
abstract: Mutations in the human DNA methyl transferase 3A (DNMT3A) gene are recurrently identified in several hematologic malignancies such as Philadelphia chromosome-negative myeloproliferative neoplasms (MPN), myelodysplastic syndromes (MDS), MPN/MDS overlap syndromes and acute myeloid leukemia (AML). They have been shown to confer worse prognosis in some of these entities. Notably, about 2/3 of these mutations are missense mutations in codon R882 of the gene. We aimed at the development and validation of a novel easily applicable in routine practice method for quantitative detection of the DNMT3A p.R882C/H/R/S mutations bead-based suspension assay. Initial testing on plasmid constructs showed excellent performance of BNA(NC)-modified probes with an optimal hybridization temperature of 66°C. The method appeared to be quantitative and showed sensitivity of 2.5% for different mutant alleles, making it significantly superior to direct sequencing. The assay was further validated on plasmid standards at different ratios between wild type and mutant alleles and on clinical samples from 120 patients with known or suspected myeloid malignancies. This is the first report on the quantitative detection of DNMT3A R882 mutations using bead-based suspension assay with BNA(NC)-modified probes. Our data showed that it could be successfully implemented in the diagnostic work-up for patients with myeloid malignancies, as it is rapid, easy and reliable in terms of specificity and sensitivity.
authors.affiliation: Laboratory of Hematopathology and Immunology, National Hematology Hospital, Sofia, Bulgaria.
authors.forename: Velizar
authors.initials: V
authors.lastname: Shivarov
authors.affiliation: Department of Clinical Immunology, Alexandrovska University Hospital, Medical University, Sofia, Bulgaria.
authors.forename: Milena
authors.initials: M
authors.lastname: Ivanova
authors.affiliation: Department of Clinical Immunology, Alexandrovska University Hospital, Medical University, Sofia, Bulgaria.
authors.forename: Elissaveta
authors.initials: E
authors.lastname: Naumova
mesh_terms: D000483:Alleles; D019943:Amino Acid Substitution / Q000235:genetics*; D001483:Base Sequence; D004247:DNA / Q000235:genetics; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000235:genetics*; D000090205:DNA Methyltransferase 3A; D004252:DNA Mutational Analysis / Q000379:methods*; D015342:DNA Probes / Q000378:metabolism*; D015894:Genome, Human / Q000235:genetics; D019337:Hematologic Neoplasms / Q000235:genetics*; D006801:Humans; D016014:Linear Models; D008863:Microspheres; D008969:Molecular Sequence Data; D009154:Mutation; D009693:Nucleic Acid Hybridization / Q000235:genetics; D012372:ROC Curve; D012015:Reference Standards
chemical_list: D015342:DNA Probes; C000717967:DNMT3A protein, human; D004247:DNA; D004248:DNA (Cytosine-5-)-Methyltransferases; D000090205:DNA Methyltransferase 3A