Evolution Quote by Siddhartha Mukherjee
““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.””
About This Quote
Source Book: The Gene: An Intimate History, 2016
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?
A Different Perspective
Regulatory sequences can be complex and context‑dependent, making prediction difficult.
![“Perhaps no order of mammals presents us with so extraordinary a series of gradations as this [step by step, from humans to apes to monkeys to lemurs] - leading us insensibly from the crown and summit of the animal creation down to creatures, from which there is but a step, as it seems, to the…” quote by Thomas Huxley](https://sms4smile.com/quotes/img-quotes/f0b/thomas-huxley-1183_animal_perhaps-no-order-of-mammals-presents-us_3051.jpg)
