Mammalian Polycistronic mRNAs and Disease

Area of Science:

• Genetics
• Molecular Biology
• Genomics

Background:

• The 'one-gene one-polypeptide' hypothesis has long been the paradigm for gene expression.
• Polycistronic genes, common in viruses, are increasingly found in mammalian genomes.
• Noncanonical translation mechanisms are crucial for understanding complex genetic phenomena.

Purpose of the Study:

• To review the evidence for polycistronic gene expression in mammals.
• To highlight the role of internal ribosome entry sites (IRES) in noncanonical translation.
• To explore the implications of polycistronic genes for disease mechanisms and therapeutic strategies.

Main Methods:

• Systematic literature review.
• Identification and analysis of mammalian genes with evidence of polycistronic expression.
• Focus on internal ribosome entry site (IRES)-mediated translation.

Main Results:

• Identified 13 mammalian genes with evidence for polycistronic expression.
• Confirmed the role of IRES in mediating translation of these polycistronic transcripts.
• Highlighted IRES-mediated translation as a significant source of genetic variation and disease insights.

Conclusions:

• Polycistronic gene expression is a relevant phenomenon in mammalian genomes.
• IRES-mediated translation provides novel insights into complex inheritance and disease.
• Further identification of polycistronic genes may reveal new therapeutic targets and disease mechanisms.