Genetic risk factors for pneumonia differ by patient subgroup

Area of Science:

• Genetics
• Immunology
• Pulmonology

Background:

• Pneumonia risk is multifactorial, influenced by demographics, chronic diseases, lifestyle, and environment.
• Previous genetic studies have not fully elucidated host genetic contributions, especially in specific patient cohorts.

Purpose of the Study:

• To conduct genome-wide meta-analyses of pneumonia in general and specific patient populations.
• To identify genetic loci associated with pneumonia and investigate genetic correlations with other traits.

Main Methods:

• Genome-wide meta-analyses of pneumonia cases (110,881) and controls (509,253) from FinnGen and Estonian biobank.
• Subgroup analyses were performed for children, working-age adults, the elderly, recurrent pneumonia patients, and asthma patients.
• Investigated genetic correlations and causal relationships between pneumonia and other traits, including obesity and smoking.

Main Results:

• Identified 12 significant loci for pneumonia, including 4 replicated and 8 novel associations.
• Subgroup analyses revealed distinct genetic associations for different age groups and conditions, highlighting genes related to inflammation, T-cell development, and lung health.
• Downstream analyses suggested potential causal roles for obesity and smoking in pneumonia development.

Conclusions:

• Host genetics, particularly immunological factors, play a crucial role in pneumonia development across the lifespan and in asthma patients.
• Genetic influences on nicotine dependency and lung health are more prominent in the elderly and individuals with recurrent pneumonia.