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Updated: May 26, 2026
A Zebrafish Model of Diabetes Mellitus and Metabolic Memory
Published on: February 28, 2013
Heritable transmission of diabetic metabolic memory in zebrafish correlates with DNA hypomethylation and aberrant
Ansgar S Olsen1, Michael P Sarras, Alexey Leontovich
1Department of Cell Biology and Anatomy, Chicago Medical School, Rosalind Franklin University of Medicine and Science, North Chicago, Illinois, USA.
Abstract:
Metabolic memory (MM) is the phenomenon whereby diabetes complications persist and progress after glycemic recovery is achieved. Here, we present data showing that MM is heritable and that the transmission correlates with hyperglycemia-induced DNA hypomethylation and aberrant gene expression. Streptozocin was used to induce hyperglycemia in adult zebrafish, and then, following streptozocin withdrawal, a recovery phase was allowed to reestablish a euglycemic state. Blood glucose and serum insulin returned to physiological levels during the first 2 weeks of the recovery phase as a result of pancreatic β-cell regeneration. In contrast, caudal fin regeneration and skin wound healing remained impaired to the same extent as in diabetic fish, and this impairment was transmissible to daughter cell tissue. Daughter tissue that was never exposed to hyperglycemia, but was derived from tissue that was, did not accumulate AGEs or exhibit increased levels of oxidative stress. However, CpG island methylation and genome-wide microarray expression analyses revealed the persistence of hyperglycemia-induced global DNA hypomethylation that correlated with aberrant gene expression for a subset of loci in this daughter tissue. Collectively, the data presented here implicate the epigenetic mechanism of DNA methylation as a potential contributor to the MM phenomenon.
Insights
Metabolic memory, where diabetes complications persist after blood sugar control, is heritable. This persistence is linked to DNA hypomethylation and altered gene expression, suggesting an epigenetic basis for the phenomenon.
Area of Science:
- Epigenetics
- Diabetology
- Molecular Biology
Background:
- Metabolic memory (MM) describes the continuation of diabetes complications despite improved glycemic control.
- The underlying mechanisms of MM, particularly its long-term effects and heritability, remain incompletely understood.
Purpose of the Study:
- To investigate the heritability of metabolic memory in zebrafish.
- To explore the role of epigenetic modifications, specifically DNA methylation, in the transmission of MM.
- To determine if hyperglycemia-induced changes persist in daughter tissues after glycemic recovery.
Main Methods:
- Induction of hyperglycemia in adult zebrafish using streptozocin, followed by a recovery phase to achieve euglycemia.
- Assessment of tissue regeneration (caudal fin, skin wound healing) and molecular markers (AGEs, oxidative stress) in parent and daughter tissues.
- Analysis of DNA methylation patterns (CpG island methylation) and gene expression (genome-wide microarray) in tissues from recovered and daughter cells.
Main Results:
- Zebrafish exhibited pancreatic beta-cell regeneration and returned to euglycemic states, but showed persistent impairments in fin regeneration and wound healing.
- These functional impairments were transmissible to daughter tissues that were never directly exposed to hyperglycemia.
- Daughter tissues did not show increased AGEs or oxidative stress but displayed persistent hyperglycemia-induced global DNA hypomethylation and aberrant gene expression in specific loci.
Conclusions:
- Metabolic memory is heritable and can be transmitted to daughter tissues via epigenetic mechanisms.
- DNA hypomethylation and altered gene expression are implicated as key contributors to the persistence of metabolic memory.
- Epigenetic modifications, particularly DNA methylation, represent a potential therapeutic target for mitigating long-term diabetes complications.
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