Presence of Genetic Variants Among Young Men With Severe COVID-19.
Caspar I van der Made,Annet Simons,Janneke H M Schuurs-Hoeijmakers,Guus R. M. van den Heuvel,Tuomo Mantere,Simone Kersten,Rosanne C. van Deuren,Marloes Steehouwer,Simon V. van Reijmersdal,Martin Jaeger,Tom Hofste,Galuh D.N. Astuti,Jordi Corominas Galbany,Vyne van der Schoot,Hans van der Hoeven,Eva Klijn,Catrien van den Meer,Jeroen Fiddelaers,Quirijn de Mast,Chantal P. Bleeker-Rovers,Leo A. B. Joosten,Helger G. Yntema,Christian Gilissen,Marcel R. Nelen,Jos W. M. van der Meer,Han G. Brunner,Mihai G. Netea,Frank L. van de Veerdonk,Alexander Hoischen +28 more
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In this case series of 4 young male patients with severe COVID-19, rare putative loss-of-function variants of X-chromosomal TLR7 were identified that were associated with impaired type I and II IFN responses and provide insights into the pathogenesis of CO VID-19.Abstract:
Importance Severe coronavirus disease 2019 (COVID-19) can occur in younger, predominantly male, patients without preexisting medical conditions. Some individuals may have primary immunodeficiencies that predispose to severe infections caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Objective To explore the presence of genetic variants associated with primary immunodeficiencies among young patients with COVID-19. Design, Setting, and Participants Case series of pairs of brothers without medical history meeting the selection criteria of young (age Exposure Severe COVID-19. Main Outcome and Measures Results of rapid clinical whole-exome sequencing, performed to identify a potential monogenic cause. Subsequently, basic genetic and immunological tests were performed in primary immune cells isolated from the patients and family members to characterize any immune defects. Results The 4 male patients had a mean age of 26 years (range, 21-32), with no history of major chronic disease. They were previously well before developing respiratory insufficiency due to severe COVID-19, requiring mechanical ventilation in the ICU. The mean duration of ventilatory support was 10 days (range, 9-11); the mean duration of ICU stay was 13 days (range, 10-16). One patient died. Rapid clinical whole-exome sequencing of the patients and segregation in available family members identified loss-of-function variants of the X-chromosomalTLR7.In members of family 1, a maternally inherited 4-nucleotide deletion was identified (c.2129_2132del; p.[Gln710Argfs*18]); the affected members of family 2 carried a missense variant (c.2383G>T; p.[Val795Phe]). In primary peripheral blood mononuclear cells from the patients, downstream type I interferon (IFN) signaling was transcriptionally downregulated, as measured by significantly decreased mRNA expression ofIRF7,IFNB1, andISG15on stimulation with the TLR7 agonist imiquimod as compared with family members and controls. The production of IFN-γ, a type II IFN, was decreased in patients in response to stimulation with imiquimod. Conclusions and Relevance In this case series of 4 young male patients with severe COVID-19, rare putative loss-of-function variants of X-chromosomalTLR7were identified that were associated with impaired type I and II IFN responses. These preliminary findings provide insights into the pathogenesis of COVID-19.read more
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