Corynebacterium

Seminal Fluid Microbiome#

Corynebacterium is one of the core genera of the seminal fluid microbiome across multiple studies. Identified as a dominant genus in seminal fluid alongside Staphylococcus, Streptococcus, and Prevotella.^{[1]Molina Morales 2023 — The Microbiome of the Male Reproductive Tract: Uncovering Its Composition and OriginsNerea Molina Morales · 2023Open reference 1 ↓[2]Javurek 2016 — Discovery of a Novel Seminal Fluid Microbiome and Influence of Estrogen Receptor Alpha Genetic StatusAngela B. Javurek, William G. Spollen, Amber M. Mann Ali et al. · 2016Open reference 2 ↓}

Environmental factors including heavy metal exposure alter Corynebacterium abundance in semen, with implications for sperm quality.^{[3]Neto 2024 — Effect of Environmental Factors on Seminal Microbiome and Impact on Sperm QualityFilipe T. Lira Neto, Marina C. Viana, Federica Cariati et al. · 2024Open reference 3 ↓}

Depletion of Corynebacterium in semen is associated with male infertility, suggesting a commensal protective role in the reproductive tract.^{[4]Ughade 2024 — Navigating the Microbial Landscape: Understanding Dysbiosis in Human Genital Tracts and Its Impact on FertilityPrachi A. Ughade, Deepti Shrivastava, Kamlesh Chaudhari · 2024Open reference 4 ↓[5]Cai 2022 — Gut Microbiota Supports Male Reproduction via Nutrition, Immunity, and SignalingHui Cai, Xuanhong Cao, Dezhe Qin et al. · 2022Open reference 5 ↓}

Prostate#

Enriched in prostate cancer tissue compared to benign prostate.^{[6]Bautista 2025 — Reprogramming Prostate Cancer Through the MicrobiomeJhommara Bautista, Walter D. Cardona-Maya, Kelly Gancino-Guevara et al. · 2025Open reference 6 ↓} Present in chronic bacterial prostatitis, where probiotic interventions alter Corynebacterium abundance.^{[7]Vocca 2025 — Probiotics in the Management of Chronic Bacterial Prostatitis: A Randomized, Double-Blind Trial to Evaluate a Possible Link Between Gut Microbiota Restoring and Symptom ReliefCristina Vocca, Diana Marisol Abrego-Guandique, Erika Cione et al. · 2025Open reference 7 ↓}

Female Reproductive Tract#

Identified in cervical mucus microbiome of endometriosis patients.^{[8]Molecular detection of microbial colonization in cervical mucus of women with and without endometriosisAkiyama K, Nishioka K, Khan KN et al. · 2019Open reference 8 ↓[9]Ser 2023 — Current Updates on the Role of Microbiome in Endometriosis: A Narrative ReviewHooi-Leng Ser, Siu-Jung Au Yong, Mohamad Nasir Shafiee et al. · 2023Open reference 9 ↓} Part of the vaginal microbiota shifts observed in deep endometriosis.^{[10]Hernandes 2020 — Microbiome Profile of Deep Endometriosis Patients: Comparison of Vaginal Fluid, Endometrium and LesionCamila Hernandes, Paola Silveira, Aline Fernanda Rodrigues Sereia et al. · 2020Open reference 10 ↓[11]MacSharry 2024 — Endometriosis Specific Vaginal Microbiota Links to Urine and Serum N-GlycomeJohn MacSharry, Zsuzsanna Kovacs, Yongjing Xie et al. · 2024Open reference 11 ↓}

Mucosal lactoferrin levels affect Corynebacterium colonization in the genital tract, linking iron sequestration to reproductive tract ecology.^{[12]Roberts 2019 — Mucosal Lactoferrin Response to Genital Tract Infections Is Associated with Iron and Nutritional BiomarkersS. A. Roberts, L. Brabin, S. Diallo et al. · 2019Open reference 12 ↓}

Iron-Regulated Virulence#

The paradigm case is C. diphtheriae, whose diphtheria toxin gene (tox) is carried by a corynephage and is transcriptionally repressed by iron via the DtxR (diphtheria toxin repressor) regulator. Under iron limitation, DtxR releases the tox promoter, and toxin production begins. This means.

Iron restriction drives virulence—the host's attempt to starve the pathogen of iron paradoxically triggers its most dangerous weapon. DtxR is an iron-dependent metalloregulatory protein that also controls siderophore biosynthesis, iron storage, and Oxidative Stress genes across all Corynebacterium species.

Non-diphtheriae Corynebacterium species retain DtxR-family regulators that control iron homeostasis, making iron a central axis of the genus's biology.

Other Associations#

ASD: Altered Corynebacterium abundance in gut microbiota of ASD children.^{[13]Strati 2017 — New Evidences on the Altered Gut Microbiota in Autism Spectrum DisordersFrancesco Strati, Duccio Cavalieri, Davide Albanese et al. · 2017Open reference 13 ↓} Cadmium exposure: Corynebacterium abundance altered by environmental cadmium in animal models.^{[14]Environmental cadmium exposure alters the internal microbiota and metabolome of Sprague-Dawley ratsSongqing Liu, Xin Deng, Zheng Li et al. · 2023Open reference 14 ↓}