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2017 ; 7
(1
): 11301
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Assessment of T-cell receptor repertoire and clonal expansion in peripheral
T-cell lymphoma using RNA-seq data
#MMPMID28900149
Gong Q
; Wang C
; Zhang W
; Iqbal J
; Hu Y
; Greiner TC
; Cornish A
; Kim JH
; Rabadan R
; Abate F
; Wang X
; Inghirami GG
; McKeithan TW
; Chan WC
Sci Rep
2017[Sep]; 7
(1
): 11301
PMID28900149
show ga
T-cell clonality of peripheral T-cell lymphoma (PTCL) is routinely evaluated with
a PCR-based method using genomic DNA. However, there are limitations with this
approach. The purpose of this study was to determine the utility of RNA-seq for
assessing T-cell clonality and T-cell antigen receptor (TCR) repertoire of the
neoplastic T-cells in 108 PTCL samples. TCR transcripts, including
complementarity-determining region 3 (CDR3) sequences, were assessed. In normal T
cells, the CDR3 sequences were extremely diverse, without any clonotype
representing more than 2% of the overall TCR population. Dominant clones could be
identified in 65 out of 76 PTCL cases (86%) with adequate TCR transcript
expression. In monoclonal cases, the dominant clone varied between 11% and 99% of
TCR? transcripts. No unique V? or V? usage was observed. Small T-cell clones were
often observed in T- and NK-cell tumors in a percentage higher than observed in
reactive conditions. ? chain expression was very low in tumors expressing TCR??,
but its expression level was high and clonality was detected in a TCR??
expressing tumor. NK cell lymphoma (NKCL) did not express significant levels of
TCR V? or V? genes. RNA-seq is a useful tool for detecting and characterizing
clonal TCR rearrangements in PTCL.