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Gene clusters and polycistronic transcription in eukaryotes
1Department of Biochemistry and Molecular Genetics, University of Colorado Health Sciences Center, Denver 80262, USA. Tom.Blumenthal@uchsc.edu
Summary
Gene clusters allow multiple genes to be expressed from one promoter in eukaryotes. This review examines polycistronic mRNAs in nematodes, mammals, flies, and plants, detailing their processing and occurrence.
Area of Science:
- Genetics
- Molecular Biology
- Eukaryotic Gene Expression
Background:
- Genes in eukaryotes are not always randomly arranged on chromosomes.
- Gene clusters represent a nonrandom arrangement where multiple genes share a single promoter.
Purpose of the Study:
- To review instances of gene clusters in eukaryotes.
- To examine the expression of multiple genes from a single promoter.
- To explore the phenomenon of polycistronic messenger RNAs (mRNAs) across different species.
Main Methods:
- Literature review of genetic and molecular biology studies.
- Analysis of gene expression mechanisms in eukaryotes.
- Comparative study of polycistronic mRNA occurrence and processing.
Main Results:
- Identified gene clusters where two or more genes are transcribed from a single promoter.
- Detailed cases of polycistronic pre-messenger RNA processing into monocistronic messenger RNAs in nematodes.
- Documented isolated examples of polycistronic mRNAs in mammals, flies, and potentially plants.
Conclusions:
- Gene clustering and polycistronic mRNA expression are observed phenomena in eukaryotes.
- The processing of polycistronic transcripts varies across species, as seen in nematodes.
- Polycistronic mRNAs, though less common than in prokaryotes, exist in diverse eukaryotic organisms.