Szarzyńska-Zawadzka B, Kosmalska M, Sędek Ł, Sonsala A, Twardoch M, Kowalczyk JR, Szczepański T, Witt M, Dawidowska M. Cost-effective screening of DNMT3A coding sequence identifies somatic mutation in pediatric T-cell acute lymphoblastic leukemia.
Eur J Haematol 2017;
99:514-519. [PMID:
28905428 DOI:
10.1111/ejh.12964]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/03/2017] [Indexed: 12/11/2022]
Abstract
BACKGROUND AND OBJECTIVES
In pediatric T-cell acute lymphoblastic leukemia (T-ALL), risk assignment schemes preclude reliable prediction of outcome, and thus, new prognostic factors are needed. Mutations in DNMT3A are candidate prognostic and classification markers in adults with acute myeloid leukemia (AML) and T-ALL and thus were considered as candidates prognostic markers in pediatric T-ALL.
PATIENTS AND METHODS
DNMT3A mutational status was investigated in 74 pediatric T-ALL samples collected at diagnosis. We applied high-resolution melt (HRM) analysis and Sanger sequencing to study the hotspot position (R882) within catalytic MTase domain and exons coding for other functional domains of the protein, known to be mutated in the wide spectrum of hematological malignancies.
RESULTS
We demonstrate a low frequency of mutations in DNMT3A coding sequence in pediatric T-ALL (1.4%, n = 1/74). We identified missense mutation, p.Ala644Thr, which has not been described previously in pediatric T-ALL, but is recurrent in adults with T-ALL and AML.
CONCLUSIONS
Low frequency of DNMT3A mutations in pediatric T-ALL is in striking contrast to adult T-ALL and renders the necessity for the search of other candidate prognostic markers. Combined Sanger sequencing-HRM approach offers a cost-effective option for genotyping DNMT3A coding sequence, with potential clinical application in other hematological malignancies.
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