Short answer
A gene is a segment of inherited DNA whose information can be expressed as a functional product. A protein is a folded amino-acid molecule that can do cellular work. Many genes specify proteins through RNA, but not every gene does; some genes produce functional RNA. 1 2
A protein-coding gene carries instructions for a protein; it is not itself a protein, and some genes produce functional RNA instead.
On this page
At a glance
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| Question | Gene | Protein |
|---|---|---|
| Material | DNA sequence | Amino-acid chain |
| Typical role | Encodes a product | Carries out a function |
| Where found | Genome | Cell structures and fluids |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Gene. A heritable DNA sequence that produces a functional product, often a protein through an RNA intermediate. 1
Protein. A molecule composed of one or more folded chains of amino acids that performs structural, regulatory, catalytic, or other functions. 2
Key differences
The gene is an information-bearing DNA region, while the protein is one possible molecular product. Expression includes transcription and, for protein-coding genes, translation. One gene may yield more than one protein form through processing, so a one-gene-one-protein slogan is too rigid. 1 2
How to tell them apart
If you are identifying bases in a chromosome or an inherited variant, you are discussing a gene. If you are measuring an enzyme, receptor or collagen molecule, you are discussing a protein. Ask whether the object is the encoded sequence or the working molecule. 1 2
Where they overlap
Gene sequences influence protein amino-acid sequences, and proteins in turn help copy, read and regulate genes. Both are fundamental to traits and cellular activity. 1 2
Edge cases
An RNA gene does not encode a protein. A protein can also be chemically modified after translation, so the finished molecule is not simply a direct DNA copy. 1 2
Why the distinction exists
Molecular biology distinguishes the stored sequence from its expressed product to explain inheritance, gene expression and changes in function. 1 2
Common misconceptions
Genes are not tiny proteins. DNA uses nucleotides; proteins use amino acids. 1 2
Examples
A variant in a hemoglobin gene changes inherited instructions; hemoglobin is the protein assembled from those instructions. 1 2
Sources
Sources checked October 3, 2026.
- National Human Genome Research Institute — Gene. Definition.
- National Human Genome Research Institute — Protein. Definition.