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  • 1
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    TLR3 deficiency in patients with herpes simplex encephalitis (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-09-18
    Description: Some Toll and Toll-like receptors (TLRs) provide immunity to experimental infections in animal models, but their contribution to host defense in natural ecosystems is unknown. We report a dominant-negative TLR3 allele in otherwise healthy children with herpes simplex virus 1 (HSV-1) encephalitis. TLR3 is expressed in the central nervous system (CNS), where it is required to control HSV-1, which spreads from the epithelium to the CNS via cranial nerves. TLR3 is also expressed in epithelial and dendritic cells, which apparently use TLR3-independent pathways to prevent further dissemination of HSV-1 and to provide resistance to other pathogens in TLR3-deficient patients. Human TLR3 appears to be redundant in host defense to most microbes but is vital for natural immunity to HSV-1 in the CNS, which suggests that neurotropic viruses have contributed to the evolutionary maintenance of TLR3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Shen-Ying -- Jouanguy, Emmanuelle -- Ugolini, Sophie -- Smahi, Asma -- Elain, Gaelle -- Romero, Pedro -- Segal, David -- Sancho-Shimizu, Vanessa -- Lorenzo, Lazaro -- Puel, Anne -- Picard, Capucine -- Chapgier, Ariane -- Plancoulaine, Sabine -- Titeux, Matthias -- Cognet, Celine -- von Bernuth, Horst -- Ku, Cheng-Lung -- Casrouge, Armanda -- Zhang, Xin-Xin -- Barreiro, Luis -- Leonard, Joshua -- Hamilton, Claire -- Lebon, Pierre -- Heron, Benedicte -- Vallee, Louis -- Quintana-Murci, Lluis -- Hovnanian, Alain -- Rozenberg, Flore -- Vivier, Eric -- Geissmann, Frederic -- Tardieu, Marc -- Abel, Laurent -- Casanova, Jean-Laurent -- G0900867/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2007 Sep 14;317(5844):1522-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Human Genetics of Infectious Diseases, Institut National de la Sante et de la Recherche Medicale (INSERM), U550, Faculty Necker, Paris 75015, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17872438" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; CD8-Positive T-Lymphocytes/immunology ; Cell Line ; Child, Preschool ; Dendritic Cells/immunology ; Encephalitis, Herpes Simplex/*genetics/*immunology ; Female ; Fibroblasts/immunology/metabolism/virology ; Genes, Dominant ; *Herpesvirus 1, Human/physiology ; Heterozygote ; Humans ; Immunity, Innate ; Infant ; Interferons/biosynthesis ; Keratinocytes/immunology ; Killer Cells, Natural/immunology ; Leukocytes, Mononuclear/immunology ; Mutation ; Poly I-C/pharmacology ; Toll-Like Receptor 3/chemistry/*deficiency/*genetics/physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Haploinsufficiency at the human IFNGR2 locus contributes to mycobacterial disease (2013)
    Oxford University Press
    Details
    Publication Date: 2013-01-25
    Description: Mendelian susceptibility to mycobacterial diseases (MSMD) is a rare syndrome, the known genetic etiologies of which impair the production of, or the response to interferon-gamma (IFN-). We report here a patient (P1) with MSMD whose cells display mildly impaired responses to IFN-, at levels, however, similar to those from MSMD patients with autosomal recessive (AR) partial IFN-R2 or STAT1 deficiency. Whole-exome sequencing (WES) and Sanger sequencing revealed only one candidate variation for both MSMD-causing and IFN--related genes. P1 carried a heterozygous frame-shift IFNGR2 mutation inherited from her father. We show that the mutant allele is intrinsically loss-of-function and not dominant-negative, suggesting haploinsufficiency at the IFNGR2 locus. We also show that Epstein-Barr virus transformed B lymphocyte cells from 10 heterozygous relatives of patients with AR complete IFN-R2 deficiency respond poorly to IFN-, in some cases as poorly as the cells of P1. Naive CD4 + T cells and memory IL-4-producing T cells from these individuals also responded poorly to IFN-, whereas monocytes and monocyte-derived macrophages (MDMs) did not. This is consistent with the lower levels of expression of IFN-R2 in lymphoid than in myeloid cells. Overall, MSMD in this patient is probably due to autosomal dominant (AD) IFN-R2 deficiency, resulting from haploinsufficiency, at least in lymphoid cells. The clinical penetrance of AD IFN-R2 deficiency is incomplete, possibly due, at least partly, to the variability of cellular responses to IFN- in these individuals.
    Print ISSN: 0964-6906
    Electronic ISSN: 1460-2083
    Topics: Biology , Medicine
    Published by Oxford University Press
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