Association between periodontitis and endometriosis: a bidirectional Mendelian randomization study.

Area of Science:

• Genetics
• Epidemiology
• Gastroenterology

Background:

• Observational studies suggest a link between periodontitis and endometriosis.
• The causal relationship between periodontitis and endometriosis remains unclear.
• Endometriosis is a complex gynecological condition with various subtypes.

Purpose of the Study:

• To investigate the potential causal relationship between periodontitis and endometriosis using a bidirectional Mendelian randomization approach.
• To explore the association between periodontitis and specific subtypes of endometriosis.
• To assess the possibility of reverse causality from endometriosis to periodontitis.

Main Methods:

• Utilized publicly available genome-wide association study (GWAS) summary datasets.
• Employed bidirectional Mendelian randomization (MR) with single nucleotide polymorphisms (SNPs) as instrumental variables.
• Applied inverse variance-weighted (IVW) regression, MR-Egger, and weighted median methods for causal inference and sensitivity analyses.

Main Results:

• Mendelian randomization analysis indicated a positive causal association between periodontitis and endometriosis of the pelvic peritoneum (OR = 1.079, P = 0.014).
• No significant causal link was found between periodontitis and other endometriosis subtypes.
• Reverse MR analysis did not reveal a causal effect of endometriosis on periodontitis.

Conclusions:

• This study provides genetic evidence supporting a causal link between periodontitis and pelvic peritoneum endometriosis.
• Periodontitis may be a contributing factor to the development of pelvic peritoneum endometriosis.
• Further research is warranted to elucidate the underlying biological mechanisms connecting periodontitis and endometriosis.