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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Allergy+Clin+Immunol
2014 ; 133
(4
): 1109-15
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Human syndromes of immunodeficiency and dysregulation are characterized by
distinct defects in T-cell receptor repertoire development
#MMPMID24406074
Yu X
; Almeida JR
; Darko S
; van der Burg M
; DeRavin SS
; Malech H
; Gennery A
; Chinn I
; Markert ML
; Douek DC
; Milner JD
J Allergy Clin Immunol
2014[Apr]; 133
(4
): 1109-15
PMID24406074
show ga
BACKGROUND: Human immunodeficiencies characterized by hypomorphic mutations in
critical developmental and signaling pathway genes allow for the dissection of
the role of these genes in the development of the T-cell receptor (TCR)
repertoire and the correlation of alterations of the TCR repertoire with diverse
clinical phenotypes. OBJECTIVE: The presence of T cells in patients with Omenn
syndrome (OS) and patients with atypical presentations of severe combined
immunodeficiency gene mutations presents an opportunity to study the effects of
the causal genes on TCR repertoires and provides a window into the clinical
heterogeneity observed. METHODS: We performed deep sequencing of TCR?
complementarity-determining region 3 (CDR3) regions in subjects with a series of
immune dysregulatory conditions caused by mutations in recombination activating
gene 1/2 (RAG 1/2), IL-2 receptor ? (IL2RG), and ? chain-associated protein
kinase 70 (ZAP70); a patient with atypical DiGeorge syndrome; and healthy control
subjects. RESULTS: We found that patients with OS had marked reductions in TCR?
diversity compared with control subjects, as expected. Patients with atypical
presentations of RAG or IL2RG mutations associated with autoimmunity and
granulomatous disease did not have altered overall diversity but instead had
skewed V-J pairing and skewed CDR3 amino acid use. Although germline TCRs were
more abundant and clonally expanded in patients with OS, nongermline sequences
were expanded as well. TCR? from patients with RAG mutations had less junctional
diversity and smaller CDR3s than patients with OS caused by other gene mutations
and healthy control subjects but relatively similar CDR3 amino acid use.
CONCLUSIONS: High-throughput TCR sequencing of rare immune disorders has
demonstrated that quantitative TCR diversity can appear normal despite
qualitative changes in repertoire and strongly suggests that in human subjects
RAG enzymatic function might be necessary for normal CDR3 junctional diversity.