- The process of copying information from DNA into new strands of messenger RNA (mRNA). The mRNA then carries this information to the cytoplasm, where it serves as the blueprint for the manufacture of a specific protein.
Definition from: Office of Rare Diseases
at the National Institutes of Health
- The synthesis of an RNA copy from a sequence of DNA (a gene); the first step in gene expression.
Definition from: Human Genome Project Information
at the U.S. Department of Energy
- Transcription is the process of making an RNA copy of a gene sequence. This copy, called a messenger RNA (mRNA) molecule, leaves the cell nucleus and enters the cytoplasm, where it directs the synthesis of the protein, which it encodes.
Definition from: Talking Glossary of Genetic Terms from the National Human Genome Research Institute
Related discussion in the Handbook
See also Understanding Medical Terminology.