What are Expressed Sequence Tags (EST)? | Genomics?

An Expressed Sequence Tag is like a short note that helps scientists read the message written in our body’s instruction book.

Imagine your body has a big library, the genome, which holds all the instructions for making you. But reading the whole library at once can be overwhelming. That's where ESTs come in: they're like little sticky notes someone left on some of the pages, telling scientists what those parts say.

Think of ESTs as snapshots of a book being read. When your body makes proteins, the things that help you grow and move, it reads certain parts of the genome. An EST is like taking a quick photo of that part while it's being read. Scientists can use these photos to figure out which genes are active in different cells or tissues.

If your body were a bakery, and each recipe was a gene, an EST would be like a snapshot of someone mixing the dough for chocolate chip cookies, telling scientists that this part of the kitchen is busy making cookie proteins!

Each EST helps scientists put together the full picture of how our bodies work.