A Phenome-Wide Association Study Uncovers a Pathological Role of Coagulation Factor X during Acinetobacter baumannii...

Area of Science:

• Immunology
• Hematology
• Microbiology

Background:

• Coagulation and inflammation are closely linked, with coagulation pathways implicated in host defense against pathogens.
• Factor X, a key component of the coagulation cascade, has potential roles in the immune response.
• Genetic variations in coagulation factor X may influence susceptibility to infection and related disorders.

Purpose of the Study:

• To investigate the role of coagulation factor X in the immune response to bacterial infections.
• To determine the clinical relevance of factor X polymorphisms in infection-related hospitalizations.
• To elucidate the mechanisms by which factor X influences host defense against Acinetobacter baumannii.

Main Methods:

• Phenome-wide association study (PheWAS) to identify clinical phenotypes associated with factor X polymorphism.
• Mouse model of factor X deficiency to study systemic Acinetobacter baumannii infection.
• Analysis of immune cell populations, cytokine, and chemokine profiles in infected factor X-deficient mice.

Main Results:

• Patients with a factor X single nucleotide polymorphism (SNP) showed increased hospitalization for hemostatic and infection-related conditions.
• Factor X-deficient mice exhibited protection against systemic Acinetobacter baumannii infection.
• Factor X deficiency led to altered immune cell composition, including increased neutrophils, macrophages, and effector T cells, and reduced cytokine/chemokine production during infection.

Conclusions:

• Factor X activity is associated with an inefficient immune response to Acinetobacter baumannii infection.
• Factor X plays a significant role in the host's inflammatory and immune defense mechanisms against bacterial pathogens.
• Targeting coagulation factor X may represent a therapeutic strategy for managing severe bacterial infections.