Cell biological insights into human STING variants.

Area of Science:

• Immunology
• Genetics
• Cell Biology

Background:

• Stimulator of interferon genes (STING) is an ER-localized protein crucial for innate immunity against viral dsDNA.
• STING activation by self-DNA or impaired membrane traffic can drive autoinflammatory and neurodegenerative diseases.
• Human STING gene variants, including R232, HAQ, and H232, exhibit heterogeneity and population stratification.

Purpose of the Study:

• To review recent insights into human STING variants and their inflammatory activities.
• To highlight the distinct roles of major STING variants in autoinflammatory disease pathogenesis.
• To summarize findings on minor pathogenic STING variants causing SAVI.

Main Methods:

• Review of recent scientific literature on STING variants and their functions.
• Analysis of genetic heterogeneity and population stratification of the human STING gene.
• Comparison of inflammatory activities of different STING variants, particularly in COPA syndrome.

Main Results:

• The HAQ STING variant mediates complete clinical protection in COPA syndrome, while R232 and H232 variants do not.
• Distinct inflammatory activities of major STING variants in autoinflammatory disease pathogenesis are revealed.
• Minor pathogenic STING variants are associated with STING-associated vasculopathy with onset in infancy (SAVI).

Conclusions:

• Human STING variants possess distinct inflammatory activities with significant clinical implications.
• The HAQ variant represents a protective factor in COPA syndrome.
• Understanding STING variant functions is critical for autoinflammatory disease research and therapeutic development.