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A transcriptomic and proteomic map of primary human cell types.

Dong-Gi Mun1, Anil K Madugundu1,2,3, Santosh Renuse1

  • 1Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN 55905, United States.

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|January 14, 2026
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Summary
This summary is machine-generated.

This study maps the transcriptome and proteome of 28 human cell types, revealing cell-specific molecules and post-translational modifications (PTMs). The findings offer new insights into human biology and disease mechanisms.

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Area of Science:

  • Human biology
  • Proteomics
  • Transcriptomics

Background:

  • Understanding human primary cell types is crucial for advancing human biology.
  • Comprehensive molecular profiling provides essential insights into cellular function and heterogeneity.

Purpose of the Study:

  • To create a detailed transcriptome and proteome map of 28 primary human cell types.
  • To identify cell type-specific molecules and novel post-translational modifications (PTMs).
  • To refine genome annotation using proteomic evidence.

Main Methods:

  • Transcriptome and proteome analysis of 28 human primary cell types.
  • Exhaustive protein database searching for 39 post-translational modifications (PTMs).
  • Proteomic evidence utilized to refine genome annotation, including alternative translational start sites and readthrough.

Main Results:

  • Identified three major cell type clusters: epithelial, endothelial, and mesenchymal at both transcriptome and proteome levels.
  • Discovered cell type-enriched molecules like GRAP and C1orf116, with C1orf116 validated in human tissues.
  • Revealed novel PTM insights, including serine O-acetylation and histidine methylation, and identified oxidative mitochondria proteins.
  • Detected peptides from translational readthrough, providing evidence for protein isoforms of LDHB and MDH1.

Conclusions:

  • The comprehensive transcriptome and proteome data highlight cell type-specific molecular characteristics and heterogeneity.
  • This molecular map provides new perspectives on disease mechanisms that may be missed by tissue-level proteomics.
  • The study advances the understanding of human cellular complexity and potential disease underpinnings.