Cited by 35Retinal Development and DisordersGenetic and Kidney Cyst DiseasesConnexins and lens biology

Kif17 phosphorylation regulates photoreceptor outer segment turnover

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Lewis, Tylor R., Kundinger, Sean R., Link, Brian A., Insinna, Christine, Besharse, Joseph C.·2018·BMC Cell Biology

Published version of a preprint

Abstract

BACKGROUND: KIF17, a kinesin-2 motor that functions in intraflagellar transport, can regulate the onset of photoreceptor outer segment development. However, the function of KIF17 in a mature photoreceptor remains unclear. Additionally, the ciliary localization of KIF17 is regulated by a C-terminal consensus sequence (KRKK) that is immediately adjacent to a conserved residue (mouse S1029/zebrafish S815) previously shown to be phosphorylated by CaMKII. Yet, whether this phosphorylation can regulate the localization, and thus function, of KIF17 in ciliary photoreceptors remains unknown. RESULTS: Using transgenic expression in zebrafish photoreceptors, we show that phospho-mimetic KIF17 has enhanced localization along the cone outer segment. Importantly, expression of phospho-mimetic KIF17 is associated with greatly enhanced turnover of the photoreceptor outer segment through disc shedding in a cell-autonomous manner, while genetic mutants of kif17 in zebrafish and mice have diminished disc shedding. Lastly, cone expression of constitutively active tCaMKII leads to a kif17-dependent increase in disc shedding. CONCLUSIONS: Taken together, our data support a model in which phosphorylation of KIF17 promotes its photoreceptor outer segment localization and disc shedding, a process essential for photoreceptor maintenance and homeostasis. While disc shedding has been predominantly studied in the context of the mechanisms underlying phagocytosis of outer segments by the retinal pigment epithelium, this work implicates photoreceptor-derived signaling in the underlying mechanisms of disc shedding.

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  • More recent work has reported comparable phagosome numbers occurring at two peaks in the mouse and zebrafish RPE, with one peak after light onset and the other after lights-off.

    “More recent work, however, has reported comparable phagosome numbers occurring at two peaks in the mouse and zebrafish RPE, with one peak after light onset and the other after lights-off (Lewis et al., 2018).”

    From The cell biology of the retinal pigment epithelium (2020) · cites this paper as Lewis et al., 2018

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Authors
Lewis, T. R., Kundinger, S. R., Link, B. A., Insinna, C., & Besharse, J. C.
Affiliations
Medical College of Wisconsin (US)
Corresponding author
  • Lewis, Tylor R.
  • Kundinger, Sean R.
  • Link, Brian A.
  • Insinna, Christine
  • Besharse, Joseph C.
Venue
BMC Cell Biology
Published
2018-11-20
Volume
19
Issue
1
Pages
25-25
ISSN
1471-2121 (ISSN-L)
OpenAlex
W2900969187
Cited by
35
References
58
Citations by year
2026: 1 · 2025: 2 · 2024: 3 · 2023: 8 · 2022: 10 · 2021: 2 · 2020: 6 · 2019: 3
FWCI
0.97
Type
journal article
Language
en
Open access
Locations
  • BMC Cell Biology (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Eye Institute (R01 EY03222, R01 EY014167, T32 EY014537, P30 EY001931)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Retinal Development and Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Kidney Cyst Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
Keywords
KIF17, CaMKII phosphorylation, ciliary photoreceptors, cone photoreceptors, intraflagellar transport, zebrafish, mice
MeSH terms
Amino Acid Sequence, Animals, Cell Line, Cilia, Humans, Mice, Inbred C57BL, Mutation, Phagosomes, Phosphorylation, Zebrafish, Kinesins, Retinal Cone Photoreceptor Cells, Zebrafish Proteins, Animals, Genetically Modified, Calcium-Calmodulin-Dependent Protein Kinase Type 2, Retinal Photoreceptor Cell Outer Segment

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