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Updated: Jan 7, 2026

An Integrated Approach for Microprotein Identification and Sequence Analysis
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Microproteins in Metabolic Biology: Emerging Functions and Potential Roles as Nutrient-Linked Biomarkers.

Seong-Hee Ko1, BeLong Cho2, Dayeon Shin1

  • 1Department of Food and Nutrition, Inha University, 100 Inha-Ro, Michuhol-Gu, Incheon 22212, Republic of Korea.

International Journal of Molecular Sciences
|December 30, 2025
PubMed
Summary

Microproteins, small proteins from short open reading frames, are increasingly recognized for vital roles in cellular metabolism and organelle function. Integrating diverse studies is key to understanding their physiological relevance and metabolic health applications.

Keywords:
metabolic disordermetabolic reprogrammingmicroproteinsmitochondrial regulationnutrient sensingobesityprecision nutritiontype 2 diabetes

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Microproteins, translated from short open reading frames (<100 amino acids), were previously overlooked but are now known to be crucial.
  • Advances in technologies like ribosome profiling and mass spectrometry have expanded the catalog of identified microproteins.
  • These small polypeptides play significant roles in cellular metabolism, organelle function, and stress adaptation.

Purpose of the Study:

  • To highlight the expanding roles of microproteins in cellular functions, particularly at the mitochondrial and endoplasmic reticulum-mitochondria interface.
  • To emphasize the involvement of microproteins in nutrient-responsive pathways and metabolic adaptation.
  • To underscore the need for integrative approaches to define microprotein physiological relevance and therapeutic potential.

Main Methods:

  • Proteogenomic analysis
  • Ribosome profiling
  • Mass spectrometry
  • Computational prediction
  • Functional studies of microprotein roles in cellular processes

Main Results:

  • Microproteins like MTLN, BRAWNIN, PIGBOS, and SMIM26 are involved in mitochondrial function, lipid oxidation, and metabolic adaptation.
  • Specific microproteins modulate mitochondrial complex translation and glucose uptake in response to nutrient availability.
  • Microproteins complement classical nutrient-sensing pathways, indicating a distinct regulatory role.

Conclusions:

  • Microproteins are essential regulators of cellular metabolism and organelle function, complementing known nutrient-sensing pathways.
  • Further integration of proteogenomics, nutrient biology, and functional studies is crucial for understanding microprotein physiology.
  • Expanding knowledge of microproteins offers potential applications for improving metabolic health.