Abstract
Neuronal ceroid lipofuscinosis (NCL) is the most common group of neurogenetic storage diseases typically beginning in childhood. The juvenile form (JNCL), also known as Batten disease, is the most common form. Vision-related problems are often an early sign, appearing prior to motor and mental deficits. We have previously investigated disease progression with age in the Cln3 Δex7/8 KI mouse model for JNCL and showed a decline of visual acuity and a predominant decline of the inner retinal function in mice, similar to human disease. The aim of this study was to further characterize this degeneration by means of flicker ERGs. For the scotopic flicker ERG, we found a significantly lower magnitude for Cln3 Δex7/8 KI mice already at 6 months of age for low stimulus frequencies, while the difference declines with increasing frequency. Under photopic conditions there was no magnitude difference at 6 months, but a cumulative magnitude reduction with further aging. For both conditions the phases were similar for both groups. There was a similar magnitude reduction for the responses of both the slow and fast rod pathway in the 15 Hz experiments, and there were no differences in response phase. Low-frequency flicker responses seem to be sensitive to very early disease manifestations, and while the degeneration is associated with a reduction of predominating inner retinal responses in the scotopic flash ERG, this predominance seems not to be related to a selective involvement of the slow and fast rod pathways.
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Acknowledgments
We would like to thank Dr. Klaus Rüther for providing Cln3 Δex7/8 mice. We thank Dr. Frank Stehr for his support. This work was funded by the NCL Foundation and the Auerbach Foundation.
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Volz, C., Mirza, M., Langmann, T., Jägle, H. (2018). Further Characterization of the Predominant Inner Retinal Degeneration of Aging Cln3 Δex7/8 Knock-In Mice. In: Ash, J., Anderson, R., LaVail, M., Bowes Rickman, C., Hollyfield, J., Grimm, C. (eds) Retinal Degenerative Diseases. Advances in Experimental Medicine and Biology, vol 1074. Springer, Cham. https://doi.org/10.1007/978-3-319-75402-4_50
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DOI: https://doi.org/10.1007/978-3-319-75402-4_50
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