A TFAP4-UBC9-SUMO1 axis orchestrates pathological mitochondrial hyperfission in diabetic complications

Jan 28, 2026Acta diabetologica

A TFAP4-UBC9-SUMO1 pathway controls harmful mitochondrial splitting in diabetes complications

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Abstract

Diabetic tissues show a distinct upregulation of pathways related to protein SUMOylation and mitochondrial organization.

A synchronized stress response was observed across multiple datasets, indicating a systemic reaction rather than isolated gene changes.
The analysis highlighted a convergence of signals associated with chronic endoplasmic reticulum stress and sustained mitophagy.
Broad shifts in lipid and energy metabolism were noted, suggesting alterations in cellular energy management.
The findings propose that the TFAP4-UBC9-SUMO1 regulatory axis plays a significant role in mitochondrial dysfunction in diabetic organs.
Increased expression of UBC9 and SUMO1 may enhance the modification of DRP1, contributing to excessive mitochondrial fission and mitophagy.

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BACKGROUND: Mitochondrial failure is a cornerstone of diabetic organ damage. While it is well understood that shattered mitochondria (excessive fission) and aggressive cleanup (mitophagy) drive this deterioration, the upstream genetic "switches" that trigger these processes remain unclear. This study investigates whether a specific regulatory chain the TFAP4-UBC9-SUMO1 axis orchestrates this mitochondrial breakdown in diabetic tissues.

METHODS: We analyzed transcriptomic data from four independent cohorts (GEO datasets: GSE1009, GSE4745, GSE6880, and GSE133598) covering diabetic renal and cardiac tissues. By integrating differential expression analysis with functional enrichment tools (GO, KEGG, and GSEA), we mapped the molecular landscape connecting cellular stress to mitochondrial dynamics and metabolic remodeling.

RESULTS: Our analysis revealed a synchronized stress response across all datasets rather than isolated gene changes. Diabetic tissues exhibited a distinct upregulation of pathways related to protein SUMOylation, mitochondrial organization, and ER stress. Specifically, the data showed a convergence of signals indicating chronic "Protein processing in the endoplasmic reticulum" and sustained "Mitophagy," accompanied by broad shifts in lipid and energy metabolism. These signatures suggest that the machinery responsible for SUMO-modifying proteins is hyperactive and tightly linked to mitochondrial clearance programs.

CONCLUSION: The transcriptomic evidence supports a model where TFAP4 acts as a transcriptional driver that boosts UBC9 and SUMO1 expression. This upregulation likely fuels the SUMO-dependent modification of DRP1, locking mitochondria in a state of hyper-fission and forcing the cell into excessive self-eating (mitophagy). The TFAP4-UBC9-SUMO1 axis thus represents a critical, yet overlooked, engine of mitochondrial depletion and offers a promising new target for halting diabetic complications.

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A TFAP4-UBC9-SUMO1 axis orchestrates pathological mitochondrial hyperfission in diabetic complications

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