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Reproductive Microbiomes: Using the Microbiome as a Novel Diagnostic Tool for Endometriosis

March 18, 2025

  • Women’s Health
    Women’s Health

    Women’s health, a vital aspect of medical science, encompasses various conditions unique to women’s physiological makeup. Historically, women were often excluded from clinical research, leading to a gap in understanding the intricacies of women’s health needs. However, recent advancements have highlighted the significant role that the microbiome plays in these conditions, offering new insights and potential therapies. MicrobiomeSignatures.com is at the forefront of exploring the microbiome signature of each of these conditions to unravel the etiology of these diseases and develop targeted microbiome therapies.

  • Microbes
    Microbes

    Microbes, short for microorganisms, are tiny living organisms that are ubiquitous in the environment, including on and inside the human body. They play a crucial role in human health and disease, functioning within complex ecosystems in various parts of the body, such as the skin, mouth, gut, and respiratory tract. The human microbiome, which is […]

Last Updated: 2024-06-23

Microbiome Signatures identifies and validates condition-specific microbiome shifts and interventions to accelerate clinical translation. Our multidisciplinary team supports clinicians, researchers, and innovators in turning microbiome science into actionable medicine.

Karen Pendergrass

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.

What was studied?

The study aimed to investigate how endometriosis affects the uterine and cervical bacterial communities. Utilizing next-generation amplicon sequencing of the bacterial 16S rRNA gene, the research sought to identify alterations in these microbiomes associated with endometriosis and to determine if specific bacterial taxa within the cervix could help diagnose active endometriosis, potentially avoiding the need for invasive diagnostic procedures like laparoscopic surgery.

 

Who was studied?

Nineteen pre-menopausal women undergoing laparoscopic surgery for pelvic pain with suspicion or known endometriosis constituted the experimental group (n=10, with endometriosis stages I-IV), while women undergoing surgery for benign uterine or ovarian conditions served as controls (n=9). The control group was examined during surgery to confirm the absence of endometriotic lesions. The staging of endometriosis for patients in the experimental group was performed using the revised American Society for Reproductive Medicine (rASRM) classification scale.

 

Key findings of the study include significant differences in bacterial communities between uterine and cervical samples, both in species diversity and abundance, with the uterus displaying a diverse profile of Bacteroidetes and Firmicutes, and the cervix dominated by Lactobacillus. No significant differences in bacterial communities were noted across different endometriosis stages on the day of surgery. However, a distinct cervical bacterial community in a stage III endometriosis patient suggests a link between disease severity and microbiome alterations. Additionally, notable fluctuations in the cervical microbiome were observed over time in this patient, indicating dynamic microbiome changes associated with disease progression and treatment.

 

What are the greatest implications of this study?

The findings underscore the potential of bacterial community profiling as a diagnostic tool for endometriosis, offering a non-invasive method to identify the disease in asymptomatic, infertile women. This approach could facilitate earlier diagnosis and treatment, potentially improving fertility outcomes and reducing the need for invasive diagnostic surgeries. The study also highlights the dynamic nature of the uterine and cervical microbiomes in relation to endometriosis, suggesting that microbiome alterations could be linked to disease severity and progression. Understanding these microbial community changes opens new avenues for researching endometriosis pathogenesis and developing novel therapeutic strategies that target microbiome modulation. Moreover, the fluctuations observed in the microbiome over time, especially in patients with advanced disease, may offer insights into predicting disease progression and treatment outcomes, including fertility potential post-treatment.

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