Abstract:
:Differentiation of memory cells involves DNA-sequence changes in B lymphocytes but is less clearly defined in T cells. RNA rearrangement is identified here as a key event in memory T cell differentiation by analysis of a mouse mutation that altered the proportions of naive and memory T cells and crippled the process of Ptprc exon silencing needed to generate CD45RO in memory T cells. A single substitution in a memory-induced RNA-binding protein, hnRNPLL, destabilized an RNA-recognition domain that bound with micromolar affinity to RNA containing the Ptprc exon-silencing sequence. Hnrpll mutation selectively diminished T cell accumulation in peripheral lymphoid tissues but not proliferation. Exon-array analysis of Hnrpll mutant naive and memory T cells revealed an extensive program of alternative mRNA splicing in memory T cells, coordinated by hnRNPLL. A remarkable overlap with alternative splicing in neural tissues may reflect a co-opted strategy for diversifying memory T cells.
journal_name
Immunityjournal_title
Immunityauthors
Wu Z,Jia X,de la Cruz L,Su XC,Marzolf B,Troisch P,Zak D,Hamilton A,Whittle B,Yu D,Sheahan D,Bertram E,Aderem A,Otting G,Goodnow CC,Hoyne GFdoi
10.1016/j.immuni.2008.11.004subject
Has Abstractpub_date
2008-12-19 00:00:00pages
863-75issue
6eissn
1074-7613issn
1097-4180pii
S1074-7613(08)00508-6journal_volume
29pub_type
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