The Histone Codes

Histone codes are chemical marks added to histone proteins around which DNA is wrapped. These modifications—like adding or removing small chemical groups—act as signals that influence whether genes are turned on or off. Think of them as a complex communication system guiding gene activity, much like traffic signals control flow. Different patterns of these marks can activate or silence specific genes, helping cells function properly, develop, or respond to changes. This system adds an extra layer of regulation beyond the DNA sequence itself, enabling precise control over gene expression in various cells and conditions.