# Identification of key biomarkers of telomere-related genes in diabetic nephropathy via bioinformatic analysis

## TL;DR

This study identifies key telomere-related genes in diabetic nephropathy using bioinformatics and machine learning, suggesting potential new diagnostic and therapeutic targets.

## Contribution

The novel contribution is the identification of telomere-related genes (TRIM22, ELOVL4, NLGN4X, FOSB) as potential biomarkers for diabetic nephropathy.

## Key findings

- Four telomere-related genes (TRIM22, ELOVL4, NLGN4X, FOSB) were identified as key biomarkers in diabetic nephropathy.
- TRIM22 showed high correlation with other key genes and high expression in specific kidney cell types.
- qRT-PCR validation confirmed the expression trends predicted by bioinformatics analysis.

## Abstract

Diabetic nephropathy (DN) is a major cause of end-stage renal disease. Understanding the molecular mechanisms underlying DN is crucial for developing new therapeutic targets and diagnostic biomarkers.

We utilized microarray data from the GEO database to identify differentially expressed genes related to DN. Machine learning algorithms, including LASSO regression and SVM-RFE, were employed to screen and validate telomere-related genes. We also predicted the transcription factors of the significant genes. Subsequently, correlation analysis and Receiver Operating Characteristic diagnostics were performed on the key genes, along with validation using external datasets. Additionally, GSEA enrichment analysis and immune infiltration analysis were conducted. Furthermore, we analyzed the expression of significant genes in cell subgroups using single-cell sequencing technology. Finally, key genes were validated in DN kidney biopsy tissues and normal kidney biopsy tissues.

Through differential analysis and machine learning screening, we identified a total of 14 differentially expressed genes related to telomeres, among which TRIM22, ELOVL4, NLGN4X, and FOSB were highlighted as key genes. We also predicted seven related transcription factors (BCLAF1, HNRNPL, TAF15, STAT1, SRSF9, SAFB2, PTEN). The key gene TRIM22 showed a high correlation with NLGN4X, ELOVL4, and NLGN4X. ROC diagnostics demonstrated sufficient diagnostic accuracy in both the test and validation sets. GSEA enrichment analysis and immune infiltration analysis revealed significant differences among immune cells, such as PC cells, and preliminary expression validation was conducted using single-cell analysis (for example, TRIM22 exhibited high expression levels in EDC, PEC, MES, and IMC). Finally, we performed RT-PCR between DN samples and control samples, finding that the expression levels of key genes in both groups were consistent with the trends predicted by bioinformatics, indicating that these genes may serve as potential diagnostic biomarkers and therapeutic targets.

This study provides a comprehensive analysis of telomere-related DEGs in DN, enhancing our understanding of DN pathogenesis. The identified key genes offer potential for new diagnostic and therapeutic strategies, warranting further investigation into their biological roles in DN.

Study workflow diagram showing the identification and validation of telomere-related biomarkers in diabetic nephropathy. It includes four phases: data collection and processing, biomarker screening using machine learning, multi-dimensional analysis and in silico validation, and single-cell analysis with experimental verification. Key processes involve differential expression analysis, gene extraction, LASSO regression, and SVM-RFE algorithm to identify significant genes. Final validated biomarkers include TRIM22, ELOVL4, NLGN4X, and FOSB, confirmed through various analyses, including qRT-PCR verification.