Herpes simplex virus 1 (HSV-1) encephalitis (HSE) is the most common form of sporadic viral encephalitis in Western countries. We discovered that childhood HSE may result from inborn errors of Toll-like receptor 3 (TLR3)-dependent, interferon (IFN)-???-mediated immunity against primary infection by HSV-1 (mutations in dsRNA-sensing endosomal receptor TLR3 and TLR3-pathway molecules UNC-93B, TRIF, TRAF3 and TBK1). Rare children with HSE and other infections carry mutations that impair immunity more broadly (STAT1 or NEMO). Thanks to NIH R01NS072381, we showed that forebrain neurons and pro-oligodendrocytes, derived from TLR3- and UNC93B-deficient induced pluripotent stem cells (iPSCs), (i) have markedly abnormal cellular responses to poly(I:C), a TLR3 mimic of dsRNA, unlike the leukocyte subsets tested, and (ii) are highly susceptible to HSV-1 infection, unlike other central nervous system (CNS)-resident cells tested. These data suggested that childhood HSE results from inborn errors of non-hematopoietic, CNS-specific, """"""""intrinsic"""""""" immunity, affecting neurons and oligodendrocytes in particular. The goal of this renewal application is to dissect in greater depth, and from three complementary angles, the neuron-intrinsic pathogenesis of HSE. First, we will devise a faster protocol to differentiate and test iPSC-derived forebrain neurons from healthy controls and four groups of patients, mutated in (i) HSE-causing TLR3-pathway genes (TRIF, TBK1, TRAF3, NEMO), (ii) HSE-causing IFN-?/?- and ?-pathway genes (STAT1 and newly discovered IFIT2), (iii) other IFN- pathway genes not related to HSE (IL10RB, TYK2, IRF7), and (iv) novel HSE-causing genes that are morbid by unknown mechanisms (DBR1, SNORA31). Second, we will devise a novel protocol to differentiate iPSCs into trigeminal neurons, where HSV-1 establishes latency in children without HSE, and compare control, TLR3- , STAT1-, IL10RB-, DBR1-, and SNORA31-mutated cells for their response to poly(I:C), IFNs, and HSV-1. Third, we will characterize the sub-cellular impact of inborn errors of TLR3, by studying the entry, retrograde axonal transport, gene delivery and replication of HSV-1 and mutants, in forebrain and trigeminal neurons from patients. To demonstrate the disease-causing role of any genetic defect, we will test isogenic iPSC lines in which the mutation has been corrected or introduced by CRISPR-Cas9 gene editing. All technologies needed have been successfully set up in a synergistic manner across our four laboratories. Exciting preliminary data have been obtained, including (i) novel genetic etiologies of childhood HSE (IFIT2, DBR1, SNORA31), (ii) novel Sendai virus (SeV)-based generation of iPSCs, (iii) novel protocols to differentiate HSV-1-permissive forebrain and trigeminal neurons, and (iv) novel imaging of HSV-1 infection in neurons. While studies of HSE have traditionally been limited to animal models, the pursuit of this human iPSC-based study will enable us to dissect in-depth the molecular and cellular basis of HSE in children with inborn errors of CNS-intrinsic immunity to HSV-1. This path-breaking collaborative study has far-reaching medical and biological implications.
HSE, a life-threatening viral infection of the CNS, is caused, at least in some children, by inborn errors that affect TLR3-, antiviral IFN-mediated, CNS-intrinsic immunity. We aim to study the neuron-intrinsic cellular mechanism of HSE pathogenesis in three complementary ways. We will (i) test HSV-1 infection in CNS forebrain neurons from iPSCs from patients carrying novel genetic etiologies of HSE, (ii) test HSV-1 infection in trigeminal nerves (where HSV-1 normally establish latency) from control and patient iPSCs, and (iii) study the sub-cellular fate of HSV-1 in control and patient neurons. These studies should enable us to decipher in-depth the molecular and cellular basis of childhood HSE.
|Vera, Elsa; Bosco, Nazario; Studer, Lorenz (2016) Generating Late-Onset Human iPSC-Based Disease Models by Inducing Neuronal Age-Related Phenotypes through Telomerase Manipulation. Cell Rep 17:1184-1192|
|Ahmad, Liyana; Zhang, Shen-Ying; Casanova, Jean-Laurent et al. (2016) Human TBK1: A Gatekeeper of Neuroinflammation. Trends Mol Med 22:511-27|
|Ciancanelli, Michael J; Abel, Laurent; Zhang, Shen-Ying et al. (2016) Host genetics of severe influenza: from mouse Mx1 to human IRF7. Curr Opin Immunol 38:109-20|
|Ciancanelli, Michael J; Huang, Sarah X L; Luthra, Priya et al. (2015) Infectious disease. Life-threatening influenza and impaired interferon amplification in human IRF7 deficiency. Science 348:448-53|
|Lafaille, Fabien G; Ciancanelli, Michael J; Studer, Lorenz et al. (2015) Deciphering Human Cell-Autonomous Anti-HSV-1 Immunity in the Central Nervous System. Front Immunol 6:208|
|Zeltner, Nadja; Studer, Lorenz (2015) Pluripotent stem cell-based disease modeling: current hurdles and future promise. Curr Opin Cell Biol 37:102-10|
|Studer, Lorenz; Vera, Elsa; Cornacchia, Daniela (2015) Programming and Reprogramming Cellular Age in the Era of Induced Pluripotency. Cell Stem Cell 16:591-600|
|Cornacchia, Daniela; Studer, Lorenz (2015) Back and forth in time: Directing age in iPSC-derived lineages. Brain Res :|
|Dincer, Zehra; Piao, Jinghua; Niu, Lei et al. (2013) Specification of functional cranial placode derivatives from human pluripotent stem cells. Cell Rep 5:1387-402|
|Zhang, Shen-Ying; Abel, Laurent; Casanova, Jean-Laurent (2013) Mendelian predisposition to herpes simplex encephalitis. Handb Clin Neurol 112:1091-7|
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