Related Experiment Video
Updated: Jan 12, 2026
A Non-random Mouse Model for Pharmacological Reactivation of Mecp2 on the Inactive X Chromosome
Published on: May 22, 2019
MODY PDX1P33T: a mouse model reveals phenotypic divergence from human disease
Aliona Harten1,2, Maximilian R Schmidtke1,2, Florian Giesert3
1Institute of Experimental Genetics, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
Introduction:
Maturity-onset Diabetes of the Young (MODY) is a rare form of diabetes and arises from mutations in key regulatory genes of the pancreatic beta cell, leading to their functional impairment and early-onset diabetes. Research into PDX1-MODY, a form of MODY caused by mutations in the PDX1 gene, enhances understanding of gene-specific mechanisms underlying glucose dysregulation and provides insights into possible approaches to restore normal metabolic function. However, no currently published mouse model accurately depicts the genetic cause of PDX1-MODY in human patients.
Methods:
Using CRISPR-Cas9 technology, we generated the first mouse model carrying one of the most prevalent pathological PDX1 point mutation found in human patients, P33T, and conducted an 18-week in vivo phenotyping experiment assessing homozygous PDX1P33T and wild-type littermates on both chow and high fat diet (HFD). Additionally, transcriptomic and proteomic analyses were performed on isolated pancreatic islets. Islet architecture was investigated via fluorescent microscopy.
Result:
Contrary to expectations, our comprehensive phenotypic analysis of the mouse model carrying the homozygous PDX1P33T mutation revealed no significant differences in metabolic parameters compared to wild-type controls, and no pathological outcomes were observed as seen in human patients. Notably, male PDX1P33T mice exhibited an increase in islet size and number on chow diet, with omics analyses suggesting reprogramming toward stress resilience, but failed to adapt respectively on HFD.
Discussion:
Our work indicates substantial differences between mouse and human PDX1 function in the pancreas. Further refinement of animal models is necessary to better elucidate the pathophysiology of PDX1-MODY.
Insights
Maturity-onset Diabetes of the Young (MODY) research using a new PDX1 mouse model showed no metabolic changes. This highlights key differences in PDX1 gene function between mice and humans, requiring improved models for PDX1-MODY.
Area of Science:
- Endocrinology
- Genetics
- Molecular Biology
Background:
- Maturity-onset Diabetes of the Young (MODY) is a rare genetic diabetes form.
- PDX1-MODY, caused by PDX1 gene mutations, impairs pancreatic beta cell function.
- Existing mouse models do not accurately represent human PDX1-MODY.
Purpose of the Study:
- To generate and characterize the first mouse model of PDX1-MODY with a common human mutation (P33T).
- To investigate the in vivo phenotype and molecular changes in PDX1-MODY mice.
Main Methods:
- CRISPR-Cas9 technology used to create the PDX1-P33T mouse model.
- 18-week in vivo phenotyping on chow and high-fat diets.
- Transcriptomic, proteomic, and islet architecture analyses.
Main Results:
- Homozygous PDX1-P33T mice showed no significant metabolic differences from wild-type controls.
- Male PDX1-P33T mice had increased islet size/number on chow diet, suggesting stress resilience.
- These mice failed to adapt to a high-fat diet, unlike human patients.
Conclusions:
- Significant differences exist between mouse and human PDX1 function.
- Current mouse models require refinement for accurate PDX1-MODY pathophysiology studies.
More Related Videos
06:49A Quick Phenotypic Neurological Scoring System for Evaluating Disease Progression in the SOD1-G93A Mouse Model of ALS
Published on: October 6, 2015
09:37A Phenotyping Regimen for Genetically Modified Mice Used to Study Genes Implicated in Human Diseases of Aging
Published on: July 14, 2016
