Manuscript Topics

o Between 1,000 and 4,000 genes have been identified that encode small proteins (fewer than 100 amino acids) yet remain uncataloged and often hidden because of arbitrary criteria, technical challenges, and misclassification within noncoding RNA regions.    
o Microproteins play crucial roles in cellular processes such as signaling, development, and metabolism; they stand out from “genetic noise” through evolutionary conservation, translational evidence from Ribo-seq, biochemical stability, and genomic context.    
o Global scientific interest in microproteins is booming because of their potential as novel therapeutic targets, drug models, and contributions to completing the mapping of the human genome.

The Role of Microproteins in Specific Pathologies and as Future Drugs

o Microproteins act as precision regulators in oncology, neurodegenerative, and cardiovascular diseases, with examples of proteins that influence tumor survival, toxic protein aggregation, and cardiac contractile force.
o They represent a revolutionary new class of drugs because of their high specificity, low toxicity, and ability to mimic natural mechanisms; immunotherapeutic micro-vaccines and peptide drugs for complex pathologies are being developed.
o In cancer, neurodegenerative, and metabolic diseases, microproteins regulate key processes such as DNA repair, autophagy, and mitochondrial metabolism, potentially making up new therapeutic targets.

Methodological Challenges and the Importance of Computational and Experimental Integration

o The small size of microproteins makes them inherently difficult to detect, isolate, and characterize, which has long contributed to their elusive nature in biological research. Nevertheless, their distinct chemical and physical properties—such as amino acid composition, charge distribution, hydrophobicity, stability, and interaction potential—provide a valuable foundation for understanding how these molecules function within cells. Careful analysis of these features can help researchers identify patterns that link molecular structure to biological activity, offering important insights into the diverse roles microproteins may play in cellular regulation, signaling, and complex physiological processes.
o The transition from genomics to functional biology is complex because of the intrinsically disordered nature of microproteins; tools like AlphaFold-Multimer help predict interactions with protein partners and their functions.
o Computational and experimental interactomics, with techniques like BioID, is essential for mapping microprotein interactions and assigning them specific biological functions.
o Limitations remain, especially regarding interactions with cofactors and lipids, and the actual biological specificity of in vitro or in silico predictions.

Emblems of discovered and characterized microproteins

o DWORF increases cardiac contractility by modulating the SERCA calcium pump and is a therapeutic target for heart failure.
o PIGBOS regulates cellular stress by interacting with proteins in the mitochondria and endoplasmic reticulum, impacting apoptotic processes.
o MRI-2 is involved in DNA repair, facilitating the activity of the Ku70/Ku80 complex, which is crucial in the response to genetic damage.
MOXI regulates muscle efficiency and energy expenditure, making it a potential target for muscular dystrophy and obesity.

Conclusions and Research Outlook

- The typical workflow could begin with bioinformatic filtering, followed by structural and functional predictions, and finally experimental validation in the laboratory.
- Phylogenetic profiling across species helps identify which microproteins merit further study, distinguishing functional sequences from genetic noise.
- Microproteins are “words” encoded by evolution that must be correctly interpreted to reveal their hidden biological and therapeutic significance.
- Physicochemical properties, such as electrostatic properties, hydrophobicity, structural flexibility, and subcellular localization tendencies, can help define the functional environments in which microproteins operate and provide clues about their potential molecular interactions and biological roles.

We invite colleagues to discuss this innovative topic. Genetic noise is like a child's scribble of undefined meaning on a large sheet of paper; a microprotein is a very short word, but evolution has written it with a precise design in a functionally important paragraph; it just needs to be interpreted.

Submitted papers should not have been previously published, nor be currently under consideration for publication elsewhere. All manuscripts will be peer-reviewed before their acceptance for publication.

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