Longitudinal single cell atlas identifies complex temporal relationship between type I interferon response and...

Area of Science:

• Immunology
• Virology
• Genomics

Background:

• Longitudinal molecular studies of early COVID-19 host response are limited.
• Understanding the dynamics of immune cell states during infection is crucial.

Purpose of the Study:

• To investigate the longitudinal host response in early COVID-19 using single-cell RNA sequencing.
• To identify molecular signatures associated with disease progression and severity.

Main Methods:

• Longitudinal single-cell RNA sequencing on blood samples from 108 COVID-19 patients.
• Analysis of discrete cell subtypes and continuous cell states.
• Validation in independent cohorts and in vitro experiments.

Main Results:

• Upregulation of type I interferon-stimulated genes (ISGs) early in infection predicts symptom worsening.
• ISG expression is dynamic in progressors, peaking early and then declining.
• Severe COVID-19 is characterized by deficient ISG expression and elevated SOCS3, which inhibits SARS-CoV-2 replication in vitro.

Conclusions:

• The type I interferon response in COVID-19 is complex and dynamic.
• Early ISG upregulation is a marker of subsequent symptom worsening.
• SOCS3 is a potential target for host-directed COVID-19 therapies.