# Integrated proteomics and single-cell transcriptomics reveal potential therapeutic targets in Wilson’s disease patients

## TL;DR

This study combines proteomics and single-cell RNA sequencing to identify new therapeutic targets and biomarkers for Wilson’s disease, focusing on immune dysregulation and the PI3K-Akt pathway.

## Contribution

The study introduces a novel integration of proteomics and single-cell transcriptomics to uncover subtype-specific biomarkers and potential drug targets in Wilson’s disease.

## Key findings

- 420 differentially expressed proteins were identified in Wilson’s disease patients, with significant enrichment in inflammatory pathways.
- Eight hub proteins, including ITIH1 and TTR, showed high diagnostic accuracy and potential therapeutic relevance.
- Immune dysregulation and PI3K-Akt-mTOR pathway enrichment in macrophages were revealed through single-cell analysis.

## Abstract

Wilson’s Disease (WD), an autosomal recessive ATP7B mutations disorder causing copper accumulation, poses diagnostic challenges. This study used proteomics and single-cell transcriptomics to identify WD mechanisms and therapeutic targets.

Proteomic analysis was conducted on clinical samples from WD patients and the control group, followed by validation via ELISA. Subsequently, an integrated analysis was conducted by combining these data with single-cell RNA sequencing data from the database. Analytical content included differential expression, functional enrichment, drug target prediction, immune infiltration, and subtype-specific biomarker screening via LASSO/SVM-REF.

Proteomic analysis identified 420 differentially expressed proteins (266 upregulated, 154 downregulated) in WD patients compared with healthy controls, with significant enrichment in inflammatory pathways. Integration with DrugBank revealed eight hub proteins with high diagnostic accuracy (AUC > 0.9), among which Inter-alpha-trypsin inhibitor heavy chain 1 (ITIH1) and Transthyretin (TTR) may regulate the PI3K-Akt signaling pathway. Subsequently, ELISA validation confirmed significantly reduced levels of TTR, Ceruloplasmin (CP), and ITIH1 proteins in WD. Considering the heterogeneity of the WD microenvironment and single-cell diversity, further single-cell transcriptomic analysis was performed. The results revealed immune dysregulation, characterized by increased macrophage infiltration and reduced T/NK cell proportions, and PI3K-Akt-mTOR pathway enrichment in macrophages. For subtype-specific analysis, six key proteins were identified to distinguish hepatic and brain subtypes (AUC > 0.9).

The hub proteins and subtype-specific biomarkers identified in this study provide potential targets for the precise treatment of WD, while emphasizing the critical role of the PI3K-Akt pathway in WD.