Polycistronic

Definition

Polycistronic refers to a type of messenger RNA (mRNA) that can encode multiple proteins within a single transcript. This is commonly found in prokaryotic organisms, such as bacteria.

5 Must Know Facts For Your Next Test

1. Polycistronic mRNA contains multiple open reading frames (ORFs), each translating into a different protein.
2. In prokaryotes, polycistronic mRNAs are often part of operons, which are clusters of genes under the control of a single promoter.
3. Polycistronic mRNA allows for the coordinated expression of genes that are functionally related.
4. The ribosome binding sites for each ORF within a polycistronic mRNA enable independent translation initiation for each encoded protein.
5. Eukaryotic cells primarily utilize monocistronic mRNA, which encodes only one protein per transcript.

Related terms

Operon:

A cluster of genes under the control of a single promoter, typically found in prokaryotes.

Open Reading Frame (ORF): A sequence of DNA or RNA that can be translated into a protein.

Monocistronic: A type of mRNA that encodes only one protein per transcript, typical in eukaryotic cells.