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Figure 1<br />

Retroviral lifecycle as summarized in Reference 67. Reprinted <strong>by</strong><br />

permission of Springer-Verlag Publishing Co., New York, NY.<br />

Page 84<br />

Although details of the timing of reverse transcription, nuclear localization, and integration are not yet<br />

clear, it is generally recognized that the movement of double-stranded viral DNA across the nuclear<br />

membrane is followed <strong>by</strong> insertion, or integration, of the viral genome into a host-cell chromosome. The<br />

viral DNA moves as part of a larger “preintegration complex,” a high-molecular-weight aggregate<br />

whose composition has not yet been completely defined.<br />

The end result of integration is the incorporation of the viral DNA into the DNA of the host cell. Once<br />

there, the provirus can serve as a template for the production of mRNA, allowing for the synthesis of<br />

viral proteins. These are assembled at the cell membrane to produce new viral particles, which then bud<br />

off to seek out new cells to infect. The integrated viral DNA is also necessarily copied whenever the<br />

host cell undergoes cell division. The insidious nature of<br />

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