Dectin-1 genetic deficiency predicts chronic lung allograft dysfunction and death

Area of Science:

• Immunology
• Transplantation
• Genetics

Background:

• Innate immune activation significantly influences lung transplant outcomes.
• Dectin-1 is a key innate receptor for pathogen recognition.
• Specific genotypes may reduce dectin-1 activity, potentially impacting transplant success.

Purpose of the Study:

• To investigate the association between dectin-1 gene polymorphisms and outcomes in lung transplant recipients.
• To examine the functional impact of the rs16910526 CLEC7A Y238X polymorphism on dectin-1 expression and activity.
• To determine if reduced dectin-1 activity correlates with increased infection, graft dysfunction, or mortality.

Main Methods:

• Genotyping for the rs16910526 CLEC7A Y238X polymorphism in two cohorts of lung allograft recipients (n=321 and n=1,129).
• Assessment of dectin-1 mRNA, protein levels (soluble and cell-surface), and associated clinical factors.
• Statistical analysis to compare outcomes between Y238X carriers and wild-type subjects.

Main Results:

• Y238X carriers exhibited significantly decreased dectin-1 mRNA and protein expression.
• Reduced dectin-1 levels were observed in bronchoalveolar lavage, plasma, and on monocytes.
• Y238X carriers faced increased risks of fungal infections (HR 1.17), graft dysfunction or death (HR 1.6), and overall mortality in both cohorts.

Conclusions:

• The CLEC7A Y238X polymorphism, leading to reduced dectin-1 activity, is associated with poorer lung transplant outcomes.
• Increased susceptibility to fungal pathogens and higher rates of graft dysfunction and mortality are linked to this polymorphism.
• Immunosuppression may exacerbate outcomes in Y238X carriers by impairing pathogen recognition and increasing fungal burden.