Corynebacterium Diphtheriae
Corynebacterium Diphtheriae - Related Videos
01:28
Diphtheria
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2026
Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...
01:28
Optogenetic Control of Gene Expression in Corynebacterium glutamicum
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2025
Take a culture of Corynebacterium glutamicum, transformed with a plasmid carrying a fluorescent reporter gene downstream of the ribonucleic acid anti-terminator or RAT sequence, in a multi-well plate.During transcription, the RAT-RNA forms a stem-loop structure that blocks RNA polymerase, halting reporter gene expression.The plasmid also constitutively expresses LicV, a fusion protein comprising the RAT-RNA-binding protein, LicT, and the blue-light-sensitive VVD domain.In darkness, LicV remains...
07:13
Two Techniques to Create Hypoparathyroid Mice: Parathyroidectomy Using GFP Glands and Diphtheria-Toxin-Mediated Parathyroid Ablation
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Cited by 4 •
2017
Mice with acquired hypoparathyroidism would be useful for studying novel drug therapies for hypoparathyroidism. Two procedures to create such mice are demonstrated. The GFP-PTX mouse is generated by surgical parathyroidectomy guided by green fluorescing parathyroid glands. A second, non-surgical approach is based on parathyroid-specific expression of the diphtheria toxin receptor.
03:30
An In Vitro Assay to Study Microbial Interactions in Co-Culture
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2026
Source: Temkin, M. I. et al. High Throughput Co-culture Assays for the Investigation of Microbial Interactions. J. Vis. Exp. (2019)This video demonstrates an in vitro assay to study microbial interactions between Corynebacterium propinquum and Staphylococcus in a co-culture.
11:44
Generation of a Humanized Mouse Liver Using Human Hepatic Stem Cells
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Cited by 3 •
2016
Here, we present a novel humanized mouse liver model generated in Alb-toxin receptor mediated cell knockout (TRECK)/SCID mice following the transplantation of immature and expandable human hepatic stem cells.
FAQs
The catalytic subunit of diphtheria toxin disables host-cell protein production by ADP-ribosylating elongation factor 2. Its A-B organization creates a functional division: the catalytic portion carries out the damaging reaction, while the complete toxin enables toxin-mediated effects in host tissue. This molecular interruption explains how a bacterial product can produce both local and systemic disease.
Lysogenic bacteriophages can transfer toxin genes to Corynebacterium Diphtheriae, linking viral genetic material with bacterial virulence. This relationship helps explain why toxin production is a critical biological feature rather than a universal property of every bacterial strain. Studying the phage connection therefore shows how genetic exchange can influence disease potential and the emergence of harmful traits.
The throat pseudomembrane reflects local tissue effects associated with infection, while diphtheria toxin can act beyond the original respiratory site. By halting host-cell protein synthesis, the toxin promotes tissue damage that may involve distant organs. This helps account for the combination of a prominent throat lesion with serious complications affecting the heart and nervous system.
The disease relevance of Corynebacterium Diphtheriae depends strongly on whether the strain produces diphtheria toxin. Toxin production connects the organism to inhibition of host protein synthesis, tissue injury, and the cardiac or neurological complications described for diphtheria. Consequently, understanding the strain’s toxin-producing capability is biologically important in addition to recognizing the bacterium itself.
Laboratory identification supports diphtheria control by establishing the bacterial cause within a broader investigation of the disease. It complements recognition of findings such as the characteristic throat pseudomembrane and helps connect clinical observations with questions about toxin production. Because identification remains central to preventing transmission and controlling outbreaks, it has both diagnostic and public-health importance.
Vaccination is a central preventive measure for reducing diphtheria transmission and supporting outbreak control. Its importance reflects the serious consequences associated with toxin-mediated disease, including tissue damage and cardiac or neurological injury. In public-health practice, vaccination works alongside laboratory identification, allowing prevention efforts and organism-focused investigations to address different parts of the same disease problem.
Corynebacterium Diphtheriae provides a model for examining bacterial virulence, toxin-mediated injury, and the biological effects of lysogenic bacteriophages. Its study connects molecular events, such as disruption of host protein synthesis, with visible disease features and systemic complications. The organism therefore links microbiology, genetics, host-cell biology, vaccination, and outbreak control within one research context.