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June 2015; 1 (1) ArticleOpen Access

Epileptic encephalopathy-causing mutations in DNM1 impair synaptic vesicle endocytosis

Ryan S. Dhindsa, Shelton S. Bradrick, Xiaodi Yao, Erin L. Heinzen, Slave Petrovski, Brian J. Krueger, Michael R. Johnson, Wayne N. Frankel, Steven Petrou, Rebecca M. Boumil, David B. Goldstein
First published April 17, 2015, DOI: https://doi.org/10.1212/01.NXG.0000464295.65736.da
Ryan S. Dhindsa
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Shelton S. Bradrick
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Xiaodi Yao
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Erin L. Heinzen
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Slave Petrovski
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Brian J. Krueger
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Michael R. Johnson
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Wayne N. Frankel
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Steven Petrou
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Rebecca M. Boumil
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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David B. Goldstein
From the Department of Molecular Genetics and Microbiology (S.S.B.), Duke University School of Medicine (R.S.D., S.S.B., X.Y.), Durham, NC; Institute for Genomic Medicine (E.L.H., S.P., B.J.K., D.B.G.), Columbia University, New York, NY; Department of Medicine (S. Petrovski), The University of Melbourne, Austin Health and Royal Melbourne Hospital, Melbourne, Australia; Centre for Clinical Translation (M.R.J.), Division of Brain Sciences, Imperial College London, Charing Cross Hospital Campus, London, United Kingdom; The Jackson Laboratory (W.N.F., R.M.B.), Bar Harbor, ME; and Division of Epilepsy (S. Petrou), The Florey Institute of Neuroscience, Victoria, Australia.
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Citation
Epileptic encephalopathy-causing mutations in DNM1 impair synaptic vesicle endocytosis
Ryan S. Dhindsa, Shelton S. Bradrick, Xiaodi Yao, Erin L. Heinzen, Slave Petrovski, Brian J. Krueger, Michael R. Johnson, Wayne N. Frankel, Steven Petrou, Rebecca M. Boumil, David B. Goldstein
Neurol Genet Jun 2015, 1 (1) e4; DOI: 10.1212/01.NXG.0000464295.65736.da

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Abstract

Objective: To elucidate the functional consequences of epileptic encephalopathy–causing de novo mutations in DNM1 (A177P, K206N, G359A), which encodes a large mechanochemical GTPase essential for neuronal synaptic vesicle endocytosis.

Methods: HeLa and COS-7 cells transfected with wild-type and mutant DNM1 constructs were used for transferrin assays, high-content imaging, colocalization studies, Western blotting, and electron microscopy (EM). EM was also conducted on the brain sections of mice harboring a middle-domain Dnm1 mutation (Dnm1Ftfl).

Results: We demonstrate that the expression of each mutant protein decreased endocytosis activity in a dominant-negative manner. One of the G-domain mutations, K206N, decreased protein levels. The G359A mutation, which occurs in the middle domain, disrupted higher-order DNM1 oligomerization. EM of mutant DNM1-transfected HeLa cells and of the Dnm1Ftfl mouse brain revealed vesicle defects, indicating that the mutations likely interfere with DNM1's vesicle scission activity.

Conclusion: Together, these data suggest that the dysfunction of vesicle scission during synaptic vesicle endocytosis can lead to serious early-onset epilepsies.

GLOSSARY

DAPI=
4',6-diamidino-2-phenylindole;
EDC=
1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide;
EM=
electron microscopy;
GFP=
green fluorescent protein;
LGS=
Lennox-Gastaut syndrome;
RFP=
red fluorescent protein;
RIPA=
radioimmunoprecipitation assay;
TBS=
Tris-buffered saline;
WT=
wild type

Footnotes

  • Funding information and disclosures are provided at the end of the article. Go to Neurology.org/ng for full disclosure forms. The Article Processing Charge was paid by the authors.

  • Supplemental data at Neurology.org/ng

  • Received March 1, 2015.
  • Accepted in final form March 20, 2015.
  • © 2015 American Academy of Neurology

This is an open access article distributed under the terms of the Creative Commons Attribution-Noncommercial No Derivative 3.0 License, which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.

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