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Adhering To The 'Replicon Model' The Sloppy Way

Sixty years ago Jacob, Brenner and Cuzin devised their 'Replicon Model', inspiring and useful guideline for replication research ever since. According to the model, a 'Replicon' is a genetic element replicated from a single 'Replicator'—replication origin, in modern terms—and replication is triggered by a positive trans-acting factor, the 'Initiator' (see the sketch). One hallmark of the 'Replicon Model' was the postulation of a positive regulator: at the time of its publication gene regulation was mostly thought about in terms of negative regulation or repression, inspired by the seminal Lac operon paradigm.

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