Sickle Cell Disease Alters Nasal and Oral Microbiomes in Children

Sickle cell disease (SCD) affects millions worldwide, causing chronic complications through vaso-occlusive events and immune dysfunction. While previous research has explored gut microbiome changes in SCD, the impact on upper respiratory tract microbiomes remained largely unknown.

Researchers conducted shotgun metagenomic sequencing on nasal and oral swabs from 40 children with SCD and 8 healthy siblings. They analyzed microbial composition, diversity, and specific pathogenic species to understand how SCD influences these critical barrier sites.

The study revealed distinct microbial patterns in children with SCD. Nasal microbiomes contained significantly higher levels of Pseudomonadota species, including concerning pathobionts like Yersinia enterocolitica and Klebsiella pneumoniae. These organisms are known to cause serious infections, particularly problematic for immunocompromised individuals. Conversely, oral microbiomes in SCD children showed reduced alpha-diversity and fewer both commensal and pathobiont species compared to healthy controls.

These findings suggest SCD creates conditions favoring pathogenic bacterial colonization in nasal passages while reducing overall microbial diversity in oral cavities. This dysbiosis pattern may explain why children with SCD experience frequent respiratory infections like pneumonia and sinusitis. The altered microbiome composition could serve as an early indicator of infection risk.

The research opens new avenues for personalized medicine approaches in SCD management. Understanding specific microbial signatures associated with infection susceptibility could guide targeted interventions, potentially including probiotic therapies or microbiome-based monitoring strategies to prevent complications and improve quality of life for affected children.