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Severe ocular abnormalities in C57BL/6 but not in 129/Sv p53-deficient mice
Purpose:
To demonstrate the importance of genetic background interaction on the development of ocular phenotypes in p53-deficient mice.
Methods:
Eyes of adult mice, homozygous and heterozygous for the p53 gene disruption in the 129/SvJ and C57BL/6J (B6) genetic backgrounds, and their F1 progeny were examined by indirect ophthalmoscopy and by light microscopy.
Results:
Indirect ophthalmoscopy revealed unilateral or bilateral vitreal opacities, fibrous retrolental tissue, and retinal folds in adult B6 mice but not in 129/Sv mice homozygous for a p53 null mutation. In B6 p53-/- mice, blood vessels extended from the peripapillary inner retina through the posterior vitreous and into the retrolental membrane. Optic nerves were hypoplastic.
Conclusions:
These findings indicate that alleles from the B6 background contribute to the aberrant ocular phenotypes observed in p53 deficiency. They also suggest that p53 or the pathway in which it functions may be important for normal eye development.
Insights
Genetic background significantly impacts ocular development in p53-deficient mice. Specific genetic alleles from the C57BL/6J background exacerbate abnormal eye phenotypes, highlighting p53
Area of Science:
- Genetics
- Ophthalmology
- Developmental Biology
Background:
- The p53 tumor suppressor gene plays a critical role in cellular responses to stress.
- Understanding gene-environment interactions is crucial for deciphering complex phenotypes.
Purpose of the Study:
- To investigate the influence of genetic background on ocular abnormalities in mice with p53 gene disruption.
- To identify specific genetic factors contributing to p53-related eye development issues.
Main Methods:
- Examined eyes from p53-deficient mice on 129/SvJ and C57BL/6J (B6) genetic backgrounds using indirect ophthalmoscopy and light microscopy.
- Analyzed homozygous, heterozygous, and F1 progeny for ocular phenotypes.
Main Results:
- p53 null mice on the B6 background exhibited vitreal opacities, fibrous retrolental tissue, retinal folds, and hypoplastic optic nerves.
- Mice on the 129/SvJ background with p53 deficiency did not display these severe ocular phenotypes.
- Aberrant blood vessel growth into the retrolental membrane was observed in B6 p53-/- mice.
Conclusions:
- Genetic background strongly influences ocular phenotype severity in p53 deficiency.
- The C57BL/6J genetic background contains alleles that promote aberrant eye development in the absence of functional p53.
- p53 and its associated pathways are essential for normal ocular development.