PMID- 12665857 OWN - NLM STAT- MEDLINE DCOM- 20030529 LR - 20071108 IS - 1529-2908 (Print) IS - 1529-2908 (Linking) VI - 4 IP - 5 DP - 2003 May TI - Monoallelic expression of the murine gene encoding Toll-like receptor 4. PG - 464-70 AB - Defects in the gene encoding Toll-like receptor 4 (Tlr4) result in impaired responses to lipopolysaccharide (LPS), rendering mice sensitive to infections by Gram-negative bacteria. C3H/HeJ mice have a codominant allele with a mutation in Tlr4, which results in an intermediate response to LPS in F1 mice from crosses of responder and C3H/HeJ mice. Here we show that this intermediate response to LPS is due to monoallelic expression of Tlr4. Allele usage is maintained during clonal expansion, a situation that resembles allelic exclusion. In contrast, Tlr4 is deleted on the recessive C57BL/10ScCr allele and all cells from F1 mice from crosses of responder and C57BL/10ScCr mice express TLR4 protein. Thus, Tlr4 is an autosomal gene whose expression is regulated similarly to that of genes on the X chromosome. FAU - Pereira, Joao Pedro AU - Pereira JP AD - Unite du Developpement des Lymphocytes, CNRS URA 1961, Institut Pasteur, 25 Rue du Docteur Roux, 75015 Paris, France. FAU - Girard, Robert AU - Girard R FAU - Chaby, Richard AU - Chaby R FAU - Cumano, Ana AU - Cumano A FAU - Vieira, Paulo AU - Vieira P LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20030331 PL - United States TA - Nat Immunol JT - Nature immunology JID - 100941354 RN - 0 (Drosophila Proteins) RN - 0 (Lipopolysaccharides) RN - 0 (Membrane Glycoproteins) RN - 0 (Receptors, Cell Surface) RN - 0 (Toll-Like Receptor 4) RN - 0 (Toll-Like Receptors) RN - 9007-49-2 (DNA) SB - IM MH - Alleles MH - Animals MH - B-Lymphocytes/cytology/drug effects/immunology MH - Base Sequence MH - Cell Differentiation MH - Crosses, Genetic MH - DNA/genetics MH - *Drosophila Proteins MH - Gene Expression Regulation, Developmental MH - Gram-Negative Bacterial Infections/genetics/immunology MH - Granulocytes/drug effects/immunology MH - Lipopolysaccharides/pharmacology MH - Lymphocyte Activation MH - Membrane Glycoproteins/*genetics MH - Mice MH - Mice, Inbred C3H MH - Mice, Inbred C57BL MH - Receptors, Cell Surface/*genetics MH - Species Specificity MH - Toll-Like Receptor 4 MH - Toll-Like Receptors EDAT- 2003/04/01 05:00 MHDA- 2003/05/30 05:00 CRDT- 2003/04/01 05:00 PHST- 2002/11/27 00:00 [received] PHST- 2003/02/28 00:00 [accepted] PHST- 2003/04/01 05:00 [pubmed] PHST- 2003/05/30 05:00 [medline] PHST- 2003/04/01 05:00 [entrez] AID - ni917 [pii] AID - 10.1038/ni917 [doi] PST - ppublish SO - Nat Immunol. 2003 May;4(5):464-70. doi: 10.1038/ni917. Epub 2003 Mar 31.