Identification and characterization of sORF-encoded polypeptides

Area of Science:

• Molecular Biology
• Genomics
• Proteomics

Background:

• Previously unannotated small proteins and peptides, termed s(m)ORF-encoded polypeptides (SEPs), have been identified.
• These SEPs are encoded by short open reading frames (sORFs or smORFs) within RNA molecules, some of which were initially considered non-coding.

Purpose of the Study:

• To provide an overview of the discovery and characterization of SEPs.
• To discuss the implications of SEPs in molecular biology and their potential functions.

Main Methods:

• Utilizing advanced molecular biology, genomics, and proteomics techniques.
• Employing genetic screens, ribosome profiling, and functional genomic/proteomic strategies.

Main Results:

• Identification of a novel class of endogenous polypeptides (SEPs) encoded by s(m)ORFs.
• Demonstration that some SEPs, even those as short as 11 amino acids, possess biochemical and cellular functions.
• Discovery of numerous SEPs, including novel human variants, through omics approaches.

Conclusions:

• The field of s(m)ORF-encoded polypeptides is rapidly emerging with significant implications for understanding the proteome.
• Further research is needed to fully elucidate the functions and biological roles of the diverse array of identified SEPs.