Dataset Information

Chemical genetic identification of CDKL5 substrates reveals its role in neuronal microtubule dynamics

ABSTRACT: Loss-of-function mutations in CDKL5 kinase causes severe neurodevelopmental delay and early-onset seizures. Identification of CDKL5 substrates is key to understanding its function. Using chemical genetics, we found that CDKL5 phosphorylates three microtubule-associated proteins: MAP1S, EB2 and ARHGEF2, and determined the phosphorylation sites. Substrate phosphorylations are greatly reduced in CDKL5 knockout mice, verifying these as physiological substrates. In CDKL5 knockout mouse neurons, dendritic microtubules have longer EB3-labelled plus-end growth duration and these altered dynamics are rescued by reduction of MAP1S levels through shRNA expression, indicating that CDKL5 regulates microtubule dynamics via phosphorylation of MAP1S. We show that phosphorylation by CDKL5 is required for MAP1S dissociation from microtubules. Additionally, anterograde cargo trafficking is compromised in CDKL5 knockout mouse dendrites. Finally, EB2 phosphorylation is reduced in patient-derived human neurons. Our results reveal a novel activity-dependent molecular pathway in dendritic microtubule regulation and suggest a pathological mechanism which may contribute to CDKL5 deficiency disorder.

INSTRUMENT(S): LTQ Orbitrap Velos

ORGANISM(S): Mus Musculus (mouse)

TISSUE(S): Brain

SUBMITTER: Lucas Baltussen

LAB HEAD: Sila Ultanir

PROVIDER: PXD010511 | Pride | 2018-09-18

REPOSITORIES: Pride

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Chemical genetic identification of CDKL5 substrates reveals its role in neuronal microtubule dynamics.

Baltussen Lucas L LL Negraes Priscilla D PD Silvestre Margaux M Claxton Suzanne S Moeskops Max M Christodoulou Evangelos E Flynn Helen R HR Snijders Ambrosius P AP Muotri Alysson R AR Ultanir Sila K SK

The EMBO journal 20180928 24

Loss-of-function mutations in CDKL5 kinase cause severe neurodevelopmental delay and early-onset seizures. Identification of CDKL5 substrates is key to understanding its function. Using chemical genetics, we found that CDKL5 phosphorylates three microtubule-associated proteins: MAP1S, EB2 and ARHGEF2, and determined the phosphorylation sites. Substrate phosphorylations are greatly reduced in CDKL5 knockout mice, verifying these as physiological substrates. In CDKL5 knockout mouse neurons, dendri ...[more]

PMID: 30266824

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