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Tunis Med. 2016 Mar;94(3):190-7.

Minimal Residual Disease assessment of IDH1/2 mutations in Acute Myeloid Leukemia by LNA-RQ-PCR.



With the growing importance of minimal residual disease (MRD) monitoring and the recent discover of IDH mutations in acute myeloid leukemia (AML), the quantification of this molecular marker provides the possibility to monitor the disease progression and the therapy efficacy.


The aim of this study is to assess the MRD in AML for the first time with IDH1 and IDH2 gene mutations in 15 AML patients.


We have screened R132 IDH1, R140 IDH2 and R172 IDH2 mutations by PCR amplification and direct sequencing and we have quantified them for the first time by RQ-PCR using reverse primers modified by an LNA. A good sensitivity has been obtained. MRD rates obtained by LNA-RQ-PCR were used to draw kinetics of the disease evolution during the follow-up.


IDH1/2 Results were compared to NPM1 mutation and WT1 over expression and have showed coherent kinetic between MRD rates in 7/11 cases. For the rest, the direct sequencing and the high resolution melting (HRM) assay have confirmed the quantification Results in diagnosis but not in residual samples.


Some optimization will be necessary to improve the mutated allele amplification. The LNA-RQ-PCR might be an easy and less cost method used in a small laboratory for myeloid leukemia MRD assessment using IDH1/2 mutations.

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