A New and Simple TRG Multiplex PCR Assay for Assessment of T-cell Clonality: A Comparative Study from the EuroClonality Consortium. Issue 3 (June 2019)

• Record Type: Journal Article
• Authors: Armand, Marine; Derrieux, Coralie; Beldjord, Kheira; Wabeke, Tamara; Lenze, Dido; Boone, Elke; Bruggemann, Monika; Evans, Paul A.S.; Gameiro, Paula; Hummel, Michael; Villarese, Patrick; Groenen, Patricia J.T.A.; Langerak, Anton W.; Macintyre, Elizabeth A.; Davi, Frederic
• Is Part Of: HemaSphere. Volume 3:Issue 3(2019)
• Publication Date: 2019-06
• Subjects: Hematology -- Periodicals; 616.15005
• DOI: 10.1097/HS9.0000000000000255
• Languages: English
• ISSNs: 2572-9241

Abstract

Abstract : Abstract: T-cell Receptor Gamma (TRG) rearrangements are commonly used to detect clonal lymphoproliferations in hematopathology, since they are rearranged in virtually all T lymphocytes and have a relatively limited recombinatorial repertoire, which reduces the risk of false negative results, at the cost of potential false positivity. We developed an initial one-tube, 2-fluorochrome EuroClonality TRG PCR multiplex (TRG-1T-2F) which was compared to the original 2-tube, 2-fluorochrome EuroClonality/BIOMED-2 TRG PCR (TRG-2T-2F) and a commercial Invivoscribe one-tube, one-fluorochrome kit (IVS-1T-1F) on a series of 239 samples, including both T-cell malignancies and reactive cases. This initial assay yielded discrepant results between the 10 participating EuroClonality laboratories when using 2 fluorochromes, leading to adoption of a final single color EuroClonality strategy (TRG-1T-1F). Compared to TRG-2T-2F, both TRG-1T-1F and IVS-1T-1F demonstrated easier interpretation and a lower risk of false positive from minor peaks in dispersed repertoires. Both generate smaller fragments and as such are likely to be better adapted to analysis of formalin-fixed paraffin-embedded (FFPE) tissue samples. Their differential performance was mainly explained by (i) superposition of biallelic rearrangements with IVS-1T-1F, due to more extensive overlapping of the repertoires and (ii) intentional omission of the TRGJP primer in TRG-1T-1F, in order to avoid the potential risk of confusion of consensus TRG V9-JP normal rearrangements with a pathological clone. Abstract : Supplemental Digital Content is available in the text