ELI5: Explain Like I'm 5

Histone methylation

Imagine a big Lego castle. Each Lego piece represents a different color and shape of genetic material called DNA that makes up our body. But just like a castle needs a strong foundation to stand, our DNA also needs support to stay organized and function properly.

That's where histones come in. Think of them like little blocks that help hold the DNA together, forming a strong and stable structure. But not all histones are the same - they can be modified in different ways to change how tightly they bind to DNA.

One way they can be modified is through a process called methylation. This means that a small chemical group called a methyl group is added onto the histone block. It's like sticking a sticker onto a Lego piece - it changes the shape and texture of the histone, which affects how it interacts with the DNA.

When a histone is methylated, it can either help to turn off or turn on specific genes. It's like putting a set of instructions on a specific part of the castle saying, "don't use these pieces right now" or "use these pieces more often."

This is important because our bodies need to maintain a delicate balance of which genes are turned on or off at any given time. If this balance is disrupted, it can lead to health problems such as cancer or developmental disorders.

Overall, histone methylation is part of a complex system in our bodies that helps regulate how our DNA functions, just like how the blocks in a Lego castle need to be arranged in a specific way to create a strong, stable structure.