Transcriptome analysis of granulation tissue from periodontal osseous defects

Area of Science:

• Periodontal Medicine
• Molecular Biology
• Genomics

Background:

• Periodontal granulation tissue is typically discarded during surgery.
• Limited research exists on the molecular characteristics of this tissue.
• Understanding its gene expression can reveal insights into periodontal healing and disease.

Purpose of the Study:

• To compare global gene expression in periodontal granulation tissue from different osseous defect types.
• To investigate gene expression changes related to healing duration and sex.
• To characterize the molecular profile of discarded granulation tissue.

Main Methods:

• RNA sequencing of granulation tissue from 19 periodontal defects (infrabony, suprabony, furcation).
• Bioinformatic analysis including gene ontology and pathway enrichment.
• Comparison of gene expression based on defect type, healing duration post non-surgical periodontal therapy (NSPT), and sex.

Main Results:

• No significant differences in gene expression were found between different osseous defect types.
• Eleven genes related to collagen synthesis and osteogenic activity showed increased expression with longer healing duration post-NSPT.
• Thirty-eight differentially expressed genes (DEG) were identified based on sex, with 24 DEG (excluding Y-linked) involved in immune regulation.

Conclusions:

• Periodontal granulation tissue exhibits epithelial characteristics and ongoing maturation beyond typical re-evaluation periods.
• The role of sex as a biological variable in periodontal immune response warrants further investigation.
• Discarded granulation tissue holds potential for understanding tissue differentiation and periodontal healing processes.