Definitions for lysogenˈlaɪ sə dʒən, -ˌdʒɛn

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  1. lysogen(Noun)

    A phage that can exist as a prophage within its host organism.

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  1. Lysogen

    A lysogen or lysogenic phage is a phage that can exist as a DNA in its dormant state within its host organism. A prophage is either integrated into the host bacteria's chromosome or more rarely exists as a stable plasmid within the host cell. The prophage expresses gene that repress the phage's lytic action, until this suppression is disrupted. Currently a variety of studies are being conducted to see whether other genes are active during lysogeny, examples of which include phage-encoded tRNA and virulence genes. Alternatively, lysogen can refer to a strain of bacterium that carries a prophage.

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