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2006:
Tabeta Koichi; Hoebe Kasper; Janssen Edith M; Du Xin; Georgel Philippe; Crozat Karine; Mudd Suzanne; Mann Navjiwan; Sovath Sosathya; Goode Jason; Shamel Louis; Herskovits Anat A; Portnoy Daniel A; Cooke Michael; Tarantino Lisa M; Wiltshire Tim; Steinberg Benjamin E; Grinstein Sergio; Beutler Bruce
The Unc93b1 mutation 3d disrupts exogenous antigen presentation and signaling via Toll-like receptors 3, 7 and 9.
Nature immunology 2006;
7(
2):.
Here we have identified 'triple D' (3d), a recessive N-ethyl-N-nitrosourea-induced mutation and phenotype in which no signaling occurs via the intracellular Toll-like receptors 3, 7 and 9 (sensors for double-stranded RNA, single-stranded RNA and unmethylated DNA, respectively). The 3d mutation also prevented cross-presentation and diminished major histocompatibility complex class II presentation of exogenous antigen; it also caused hypersusceptibility to infection by mouse cytomegalovirus and other microbes. By positional identification, we found 3d to be a missense allele of Unc93b1, which encodes the 12-membrane-spanning protein UNC-93B, a highly conserved molecule found in the endoplasmic reticulum with multiple paralogs in mammals. Innate responses to nucleic acids and exogenous antigen presentation, which both initiate in endosomes, thus seem to depend on an endoplasmic reticulum-resident protein, which suggests communication between these organellar systems.
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