Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
Cis-acting elements are DNA sequences in the vicinity of the structural portion of a gene that have regulatory functions. They control the transcription and translation of nearby genes.
Related terms
Trans-Acting Factors: These are proteins that bind to cis-acting elements to control gene expression. They're like enforcers or police officers implementing the rules set by our local officials (cis-acting elements).
Enhancer: A short region of DNA that can be bound with proteins (trans-acting factors) to enhance transcription levels of genes. This is like a motivational speaker boosting morale and productivity at work.
Silencer: A DNA sequence capable of binding transcription regulation factors, called repressors. It down-regulates the expression of a gene. Imagine this as a strict boss who slows down work progress.