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Differential manifestation of ocular phenotypes in TALEN-mediated p19arf knockout FVB/N and C57BL/6J mouse lines

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Abstract

Background

p19arf, primarily known as a tumor suppressor, has also been reported to play an essential role in normal development of mouse eyes. Consistently, lack of p19arf has been associated with ocular defects, but the mixed background of the knockout (KO) mouse strain used raised a concern on the accuracy of the phenotypes observed in association with the targeted gene due to genetic heterogeneity.

Object

We carried out a study to investigate into the effect of genetic background on the manifestation of p19arf KO associated phenotypes.

Methods

We characterized the phenotypes of novel p19arf KO mouse lines generated in FVB/N and C57BL/6J using a transcription activator-like effector nuclease (TALEN) system in comparison to the reported phenotypes of three other p19arf-deficient mouse lines generated using homologous recombination.

Results

Ninety-five percent of FVB/N-p19arf KO mice showed ocular opacity from week 4 after birth which worsened rapidly until week 6, while such abnormality was absent in C57BL/6J-p19arf KO mice up to the age of 26 weeks. Histopathological analysis revealed retrolental masses and dysplasia in the retinal layer in FVB/N-p19arf KO mice from week 4. Besides these, both strains developed normally from birth to week 26 without increased tumorigenesis except for a subcutaneous tumor found in a C57BL/6J-p19arf KO mouse.

Conclusion

Our findings demonstrated surprisingly variable manifestation of p19arf-linked phenotypes between FVB/N and C57BL/6J mice, and furthermore between our mouse lines and the established lines, indicating a critical impact of genetic background on functional study of genes using gene targeting strategies in mice.

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Acknowledgements

This research was supported by a grant (14182MFDS978) from Ministry of Food and Drug Safety in 2015.

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Authors

Contributions

BCK, HWL and KT contributed to the study conception and design. Material preparation, data collection and analysis were performed by JSP, JIK, HJL, SR, EK and KMH. The first draft of the manuscript was written by JSP and JIK and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Byeong-Cheol Kang.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethics approval

All experiments were approved by the Institutional Animal Care and Use Committee (IACUC) in Seoul National University Hospital (Protocol number: 15-0031-C2A0(1)) and animals were maintained and used in accordance with Guide for the Care and Use of Laboratory Animals (NR 2010).

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Park, JS., Kim, JI., Lim, HJ. et al. Differential manifestation of ocular phenotypes in TALEN-mediated p19arf knockout FVB/N and C57BL/6J mouse lines. Genes Genom 42, 1023–1033 (2020). https://doi.org/10.1007/s13258-020-00959-z

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  • DOI: https://doi.org/10.1007/s13258-020-00959-z

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