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2014 ; 111
(50
): E5411-9
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Miz-1 regulates translation of Trp53 via ribosomal protein L22 in cells
undergoing V(D)J recombination
#MMPMID25468973
Rashkovan M
; Vadnais C
; Ross J
; Gigoux M
; Suh WK
; Gu W
; Kosan C
; Möröy T
Proc Natl Acad Sci U S A
2014[Dec]; 111
(50
): E5411-9
PMID25468973
show ga
To be effective, the adaptive immune response requires a large repertoire of
antigen receptors, which are generated through V(D)J recombination in lymphoid
precursors. These precursors must be protected from DNA damage-induced cell
death, however, because V(D)J recombination generates double-strand breaks and
may activate p53. Here we show that the BTB/POZ domain protein Miz-1 restricts
p53-dependent induction of apoptosis in both pro-B and DN3a pre-T cells that
actively rearrange antigen receptor genes. Miz-1 exerts this function by directly
activating the gene for ribosomal protein L22 (Rpl22), which binds to p53 mRNA
and negatively regulates its translation. This mechanism limits p53 expression
levels and thus contains its apoptosis-inducing functions in lymphocytes,
precisely at differentiation stages in which V(D)J recombination occurs.