Pathogenic E2K mutation of doublecortin X (DCX) alters microtubule stabilisation and actin filament association

• Published in: Biochemical and biophysical research communications Vol. 513; no. 3; pp. 540 - 545
• Main Authors: Moslehi, Maryam, Ng, Dominic C.H., Bogoyevitch, Marie A.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Inc 04-06-2019
• Subjects: Actin Cytoskeleton - metabolism; Animals; Cell Line, Tumor; Chlorocebus aethiops; COS Cells; Cytoskeleton; Doublecortin X; Humans; Microtubule dynamics; Microtubule-Associated Proteins - genetics; Microtubule-Associated Proteins - metabolism; Microtubules - metabolism; Mutation; Neuropeptides - genetics; Neuropeptides - metabolism; Nocodazole - pharmacology; Pathogenic mutant; Tubulin - metabolism; Tubulin Modulators - pharmacology; Cytoskeleton; Microtubule dynamics; Doublecortin X; Pathogenic mutant
• ISSN: 0006-291X; 1090-2104
• DOI: 10.1016/j.bbrc.2019.04.005

Mutations of the microtubule (MT)-associated protein Doublecortin X (DCX) gene disrupt cortical layering in brain development. Whilst many of these pathogenic DCX mutations are within the doublecortin domains (DC1 and DC2) that mediate direct DCX-MT association, a pathogenic mutation DCX E2K that causes cognitive impairment and pachygyria in human patients lies within the regulatory DCX N-terminus (DCX-N) preceding the DC1 domain. Here, we characterise the impact of DCX E2K on cytoskeletal association and regulation in neuronal cells. We show that the DCX E2K mutant protein retains the ability to interact with and bundle MTs, but these MTs show a reduced sensitivity to nocodazole-induced depolymerisation as well as slower α-tubulin exchange rates. Furthermore, we showed increased association of DCX E2K mutant with the actin filament (F-ACT) network. These results highlight the importance of the N-terminus of DCX in regulating association and co-ordination of MT and F-ACT networks.
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•The DCX E2K pathogenic mutant favours association with F-ACT.•Exchange rates of tubulin within MTs are slowed in the presence of DCX E2K.•Association of DCX E2K with MTs slows nocodazole-induced MT depolymerisation.