Non-Surgical Periodontal Therapy Modulates Oral Microbiome in Primary Immunodeficient ChildrenOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study asked how the subgingival plaque microbiome differs in children with primary immunodeficiency (PID) and how it responds to non-surgical periodontal therapy. Researchers profiled bacteria and linked them to neutrophil counts. Subgingival plaque was sampled from three first molars and one first incisor at baseline and six months after therapy. Bacteria were profiled by Illumina 16S rRNA gene sequencing of the V1-V2 region. Therapy was oral hygiene instruction plus professional mechanical plaque removal over one to four visits.
Who was studied?
The cohort was 24 children with neutrophil-related primary immunodeficiencies and 24 age-matched, systemically healthy controls, recruited in London (Great Ormond Street Hospital and Barts Health NHS Trust). PID diagnoses included severe congenital, autoimmune and cyclic neutropenia, Papillon-Lefevre and Shwachman-Diamond syndromes, and Fanconi anaemia. Mean age at PID diagnosis was 4.2 years. Among PID children, 29.2 percent had periodontitis and 33.3 percent gingivitis, versus none with periodontitis among controls. Nine PID children had paired follow-up samples.
What were the most important findings?
After therapy, PID children showed significant shifts in community structure and reduced alpha diversity. Health-associated nitrate-reducing taxa increased, while pathogenic taxa decreased, alongside clinical gains. Mean probing depth fell from 2.35 to 1.96 mm and attachment loss from 1.56 to 1.07 mm. PERMANOVA confirmed significant baseline separation from controls. Baseline neutrophil counts correlated with several subgingival taxa. Saccharibacteria clade 578 was positively associated with neutrophil counts and decreased after therapy, pointing to host immunity shaping the community.
What are the greatest implications of this study?
The results suggest non-surgical periodontal therapy can steer the subgingival microbiome of neutropenic children toward a healthier composition, even when immune defenses are impaired. The neutrophil-taxa associations point to host immunity shaping periodontal ecology. This may help tailor dental care in immunodeficient children. Full periodontal health was rarely restored, so ongoing maintenance is likely needed. The diverse, small cohort limits how far the findings extend to specific PID subtypes.