What are monogenic disorders?

A monogenic disorder is when one single gene goes wrong and causes a problem in your body.

Imagine you're building a toy car. Each part, like the wheels, engine, and frame, comes from different boxes. If one box has a broken wheel, the whole car might not work right. That’s kind of what happens with monogenic disorders. Your body uses genes to build things like your eyes, heart, or even how you grow.

Think of a gene as a special recipe. Most of the time, it works perfectly. But if that recipe has a typo, like writing "salt" instead of "sugar", the final dish might not taste right. That’s what happens when someone has a monogenic disorder. The body tries to make something important using the wrong instructions.

For example, cystic fibrosis is a monogenic disorder caused by one gene that doesn’t work well. It affects how your lungs and digestive system function, just like if the recipe for a cake had a mistake, the cake might be too dry or not cook all the way.