L' opéron lac : d’un modèle bactérien à un langage pour la régulation génique
DOI :
https://doi.org/10.18192/osurj.v5i1.7922Résumé
Cet article propose un commentaire historique et conceptuel sur le modèle d’opéron formulé par Jacob et Monod à partir de l’étude du système lac chez Escherichia coli en 1961. Il rappelle comment l’introduction de gènes régulateurs, de séquences opératrices et d’un messager instable, l’ARNm, a permis de concevoir la régulation de l’expression génique comme un problème logique fondé sur des circuits de décision plutôt que comme une simple lecture de l’ADN. Le texte montre que l’opéron lac reste un exemple canonique dans l’enseignement de la biologie moléculaire, au cœur des manuels et d’outils d’évaluation, et qu’il structure encore les premières représentations étudiantes de la régulation génique. Enfin, il met en évidence l’influence durable du modèle d’opéron sur la biologie de synthèse et la biologie des systèmes, où la logique répresseur–opérateur, les architectures modulaires et la notion de circuits régulateurs continuent d’inspirer la conception de réseaux génétiques artificiels.
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