X-linked recessive TLR7 deficiency in ~1% of men under 60 years old with life-threatening COVID-19.
Sci Immunol
; 6(62)2021 08 19.
Article
in English
| MEDLINE | ID: covidwho-1434876
ABSTRACT
Autosomal inborn errors of type I IFN immunity and autoantibodies against these cytokines underlie at least 10% of critical COVID-19 pneumonia cases. We report very rare, biochemically deleterious X-linked TLR7 variants in 16 unrelated male individuals aged 7 to 71 years (mean 36.7 years) from a cohort of 1,202 male patients aged 0.5 to 99 years (mean 52.9 years) with unexplained critical COVID-19 pneumonia. None of the 331 asymptomatically or mildly infected male individuals aged 1.3 to 102 years (mean 38.7 years) tested carry such TLR7 variants (p = 3.5 × 10-5). The phenotypes of five hemizygous relatives of index cases infected with SARS-CoV-2 include asymptomatic or mild infection (n=2, 5 and 38 years), or moderate (n=1, 5 years), severe (n=1, 27 years), or critical (n=1, 29 years) pneumonia. Two boys (aged 7 and 12 years) from a cohort of 262 male patients with severe COVID-19 pneumonia (mean 51.0 years) are hemizygous for a deleterious TLR7 variant. The cumulative allele frequency for deleterious TLR7 variants in the male general population is < 6.5x10-4 We also show that blood B cell lines and myeloid cell subsets from the patients do not respond to TLR7 stimulation, a phenotype rescued by wild-type TLR7 The patients' blood plasmacytoid dendritic cells (pDCs) produce low levels of type I IFNs in response to SARS-CoV-2. Overall, X-linked recessive TLR7 deficiency is a highly penetrant genetic etiology of critical COVID-19 pneumonia, in about 1.8% of male patients below the age of 60 years. Human TLR7 and pDCs are essential for protective type I IFN immunity against SARS-CoV-2 in the respiratory tract.
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Genetic Diseases, X-Linked
/
Toll-Like Receptor 7
/
COVID-19
/
Immune System Diseases
Type of study:
Cohort study
/
Etiology study
/
Observational study
/
Prognostic study
Topics:
Long Covid
/
Variants
Limits:
Adolescent
/
Adult
/
Aged
/
Child
/
Child, preschool
/
Humans
/
Infant
/
Male
/
Middle aged
/
Young adult
Language:
English
Year:
2021
Document Type:
Article
Affiliation country:
Sciimmunol.abl4348
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