E. Lantelme et al., Cutting edge: Recombinase-activating gene expression and V(D)J recombination in CD4(+)CD3(low) mature T lymphocytes, J IMMUNOL, 164(7), 2000, pp. 3455-3459
The recombinase-activating genes, RAG-1 and RAG-2, can be expressed by a su
bset of B cells within germinal centers, where they mediate secondary V(D)J
rearrangements. This receptor revision mechanism could serve either recept
or diversification or tolerance-induced functions. Alternatively, it might
rescue those cells the receptors of which have been damaged by somatic muta
tion. Less is known about the occurrence of similar mechanisms in T cells.
Here we show that mature T cells with defective TCR surface expression can
express RAG genes and are capable of initiating secondary V(D)J rearrangeme
nts. The possibility that a cell rescue mechanism based on the generation o
f a novel Ag receptor might be active in peripheral T cells is envisaged.