--- title: "Meaning & Key Takeaway of: The third cardinal feature of gene…" description: "\"“The third cardinal feature of gene regulation, Monod and Jacob discovered, was that every gene had specific regulatory DNA sequences appended to it th..." image: "https://sms4smile.com/quotes/i/7eb/siddhartha-mukherjee-1619_evolution_the-third-cardinal-feature-of-gene-regul_2764624.png" --- # The third cardinal feature of gene regulation, Monod and… ![“The third cardinal feature of gene regulation, Monod and Jacob discovered, was that every gene had specific regulatory DNA sequences appended to it that acted like recognition tags. Once a sugar sensing-protein had detected sugar in the environment, it would recognize one such tag and turn the…” quote by Siddhartha Mukherjee](https://sms4smile.com/quotes/i/7eb/siddhartha-mukherjee-1619_evolution_the-third-cardinal-feature-of-gene-regul_2764624.png) [Download](https://sms4smile.com/quotes/i/7eb/siddhartha-mukherjee-1619_evolution_the-third-cardinal-feature-of-gene-regul_2764624.png) [Open image](https://sms4smile.com/quotes/i/7eb/siddhartha-mukherjee-1619_evolution_the-third-cardinal-feature-of-gene-regul_2764624.png) > ““The third cardinal feature of gene regulation, Monod and Jacob discovered, was that every gene had specific regulatory DNA sequences appended to it that acted like recognition tags. Once a sugar sensing-protein had detected sugar in the environment, it would recognize one such tag and turn the target genes on or off. That was a gene's signal to make more RNA messages and thereby generate the relevant enzyme to digest the sugar. A gene, in short, possessed not just information to encode a protein, but also information about when and where to make that protein. All that data was encrypted in DNA, typically appended to the front of every gene (although regulatory sequences) an also be appended to the ends and middle of genes). The combination of regulatory sequences and the protein-encoding sequence defined a gene.”” [Siddhartha Mukherjee](https://sms4smile.com/quotes/author/siddhartha-mukherjee/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Genes contain both coding information and regulatory tags that tell cells when, where, and how much protein to produce. **In simple terms:** Genes have built‑in instructions for timing and location of protein production. Key Takeaway Consider both coding and regulatory DNA in genetic studies. Themes genetics regulation biology information theory Mood curious analytical inquisitive Type scientific educational When to use this quote - biomedical research - synthetic biology - genetic engineering - medical diagnostics Key Concepts DNA regulatory elements gene expression signal transduction Questions to Reflect On - How do cells integrate multiple regulatory signals? - What role do non‑coding regions play in disease? 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That was a gene's signal to make more RNA messages and thereby generate the relevant enzyme to digest the sugar. A gene, in short, possessed not just information to encode a protein, but also information about when and where to make that protein. All that data was encrypted in DNA, typically appended to the front of every gene (although regulatory sequences) an also be appended to the ends and middle of genes). 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