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        A certified plasmid reference material for the standardisation of <i>BCR–ABL1</i> mRNA quantification by real-time quantitative PCR

        White, H,Deprez, L,Corbisier, P,Hall, V,Lin, F,Mazoua, S,Trapmann, S,Aggerholm, A,Andrikovics, H,Akiki, S,Barbany, G,Boeckx, N,Bench, A,Catherwood, M,Cayuela, J-M,Chudleigh, S,Clench, T,Colomer, D,Dar Nature Publishing Group 2015 Leukemia Vol.29 No.2

        <P>Serial quantification of <I>BCR–ABL1</I> mRNA is an important therapeutic indicator in chronic myeloid leukaemia, but there is a substantial variation in results reported by different laboratories. To improve comparability, an internationally accepted plasmid certified reference material (CRM) was developed according to ISO Guide 34:2009. Fragments of <I>BCR–ABL1</I> (e14a2 mRNA fusion)<I>, BCR</I> and <I>GUSB</I> transcripts were amplified and cloned into pUC18 to yield plasmid pIRMM0099. Six different linearised plasmid solutions were produced with the following copy number concentrations, assigned by digital PCR, and expanded uncertainties: 1.08±0.13 × 10<SUP>6</SUP>, 1.08±0.11 × 10<SUP>5</SUP>, 1.03±0.10 × 10<SUP>4</SUP>, 1.02±0.09 × 10<SUP>3</SUP>, 1.04±0.10 × 10<SUP>2</SUP> and 10.0±1.5 copies/μl. The certification of the material for the number of specific DNA fragments per plasmid, copy number concentration of the plasmid solutions and the assessment of inter-unit heterogeneity and stability were performed according to ISO Guide 35:2006. Two suitability studies performed by 63 <I>BCR–ABL1</I> testing laboratories demonstrated that this set of 6 plasmid CRMs can help to standardise a number of measured transcripts of e14a2 <I>BCR–ABL1</I> and three control genes (<I>ABL1, BCR</I> and <I>GUSB</I>). The set of six plasmid CRMs is distributed worldwide by the Institute for Reference Materials and Measurements (Belgium) and its authorised distributors (https://ec.europa.eu/jrc/en/reference-materials/catalogue/; CRM code ERM-AD623a-f).</P>

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