Eric Kandel on Jacques Monod

“Jacques Monod... published a paper entitled "Genetic Regulatory Mechanisms in the Synthesis of Protein." Using bacteria as a model system, they made the remarkable discovery that genes can be regulated—that is, they can be switched on and off like a water faucet.”

“In the Jacob-Monod model, signals from a cell's environment activate regulatory proteins that switch on the genes encoding particular proteins. This led [Philip] Goelet and me to wonder whether the crucial step in switching on long-term memory in sensitization might involve similar signals and similar gene regulatory proteins.”

“Jacob and Monod not only outlined a theory of gene regulation, they also discovered the first regulators of gene transcription. These regulators come in two forms—repressors, genes that encode the regulatory proteins that shut genes off, and as later work showed, activators, genes that encode the regulatory proteins that turn genes on.”

“Jacob and Monod found that in bacteria, genes are switched on and off by other genes. This led them to distinguish between effector genes and regulatory genes. Effector genes encode effector proteins... which mediate specific cellular functions. Regulatory genes encode proteins called regulatory proteins, which switch the effector genes on or off.”