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December 2017; 3 (6) ArticleOpen Access

CDKL5 variants

Improving our understanding of a rare neurologic disorder

Ralph D. Hector, Vera M. Kalscheuer, Friederike Hennig, Helen Leonard, Jenny Downs, Angus Clarke, Tim A. Benke, Judith Armstrong, Mercedes Pineda, Mark E.S. Bailey, Stuart R. Cobb
First published December 15, 2017, DOI: https://doi.org/10.1212/NXG.0000000000000200
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Article Information

vol. 3 no. 6 e200
DOI: 
https://doi.org/10.1212/NXG.0000000000000200
Published By: 
Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology
Online ISSN: 
2376-7839
History: 
  • Received May 2, 2017
  • Accepted in final form September 28, 2017
  • First Published December 15, 2017.
Copyright & Usage: 
Copyright © 2017 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology. This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.

Author Disclosures

    1. Ralph D. Hector, PhD,
    2. Vera M. Kalscheuer, PhD,
    3. Friederike Hennig, MSc,
    4. Helen Leonard, MBChB,
    5. Jenny Downs, PhD,
    6. Angus Clarke, DM,
    7. Tim A. Benke, MD, PhD,
    8. Judith Armstrong, PhD,
    9. Mercedes Pineda, MD, PhD,
    10. Mark E.S. Bailey, PhD and
    11. Stuart R. Cobb, PhD
  1. Ralph D. Hector, PhD,
    2. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for travel or speaker honoraria:

    1. (1) Loulou Foundation, funding for travel to speak at conference

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NONE

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. (1) CDKL5 UK (2) Loulou Foundation, Junior Fellowship

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  2. Vera M. Kalscheuer, PhD,
    3. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NONE

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. (1)University of Pennsylvania Orphan Disease Center on behalf of Loulou Foundation

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  3. Friederike Hennig, MSc,
    4. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NONE

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. NONE

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  4. Helen Leonard, MBChB,
    5. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for travel or speaker honoraria:

    1. Dr Helen Leonard received an honorarium and travel funding to attend the International Symposium of Rett Syndrome in Kobe in 2017, Japan as well as two other symposia in Kurume and Tokyo. Travel to Rett syndrome conferences in Rome, Italy (October 2105), Kazan, Russia (May 2016), Melbourne, Australia (November 2015) and Vienna, Austria (October 2016) has also been funded by the Italian, Russian and Australia Rett syndrome parent associations. In March 2017, her travel to Melbourne to attend a clinical trials meeting was funded by Newron Pharmaceuticals. Dr Leonard?s travel to attend the CDKL5 forums in London in October 2015 and 2016 was funded through the Loulou Foundation.

    Editorial Boards:

    1. On Editorial Board 2013-2017 for journal Children

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NHMRC Program Grant #572742, PI 2010-2014 Dr Leonard is currently funded by a NHMRC Senior Research Fellowship #1117105.

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. International Foundation for CDKL5 Research Rettsyndrome.org

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  5. Jenny Downs, PhD,
    6. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for travel or speaker honoraria:

    1. Funded by the Rett Syndrome Association of Australia to present at the 2015 family conference in Geelong Australia. Funded by BioGen to attend an assessment workshop for Spinal Muscular Atrophy.

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. (1) Telethon Kids Institute, Senior Research Fellow, 11 years (2) Curtin University, Lecturer, 14 years

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NHMRC Project Grant #1103745, CIA, 2016-2018 NHMRC Project Grant #1103746, CIA, 2016-2019

    Research Support, Academic Entities:

    1. Telethon Kids Institute (Big Idea Seed Funding), CIA, 2016 Telethon Kids Institute (Brain and Behaviour Seed Grant), CIA, 2015-2016

    Research Support, Foundations and Societies:

    1. International Foundation for CDKL5 Research, CIB, 2016-2018

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  6. Angus Clarke, DM,
    7. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. Associate Editor, Journal of Community Genetics Associate Editor, European Journal of Human Genetics Editorial Board, Human Genetics Editorial Board, Communication & Medicine Editorial Board, Wiley's Encyclopedia of Life Sciences Editorial Board, Genome Medicine

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. Edimer Pharmaceuticals

    Research Support, Government Entities:

    1. ESRC Grant Number ES/L002868/1 Co-Applicant (Principal Applicant for the Cardiff site) 2014-2017

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. NONE

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  7. Tim A. Benke, MD, PhD,
    8. Scientific Advisory Boards:

    1. 1) commercial entity: Avexis (since Aug 1, 2017) 2) commercial entity: Marinus (since Sep 26, 2017)

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. 1) Questcor Pharmaceuticals (Benke-PI)03/01/2012-12/30/2017 Whole-exome sequencing and ACTH responsiveness in Infantile Spasms

    Research Support, Government Entities:

    1. 1) 1U10NS077277 (Vollmer)9/30/2011-08/31/2018 NIH/NINDS Rocky Mountain Network for Neuroscience Clinical Studies Role: Co-I. 2) U54 HD061222 (Percy)09/30/2003-07/31/2019 Rare Disease CRC for New Therapies and New Diagnostics Role: Site Director, Co-I. 3)OMBD (Benke-site PI)09/01/2016-08/31/2019 Rett Syndrome Research Trust (RSRT) Outcome Measures and Biomarker Development in Rett Syndrome 4) Cure/Emory (Traynelis)08/01/2016-07/31/2018 Site PI Functional and clinical evaluations of glutamate receptor mutations in epileptic encephalopathies 5) Orphan Disease Center/U Penn (Benke-PI) 5/01/2017-/30/2018 CDKL5 Pilot Grant Program Mechanisms and treatment of paradoxical hyperexcitability in CDKL5 deficiency syndrome.

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. NONE

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  8. Judith Armstrong, PhD,
    9. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NONE

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. NONE

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  9. Mercedes Pineda, MD, PhD,
    10. Scientific Advisory Boards:

    1. Received consulting fees and payment for lectures from Actelion Pharmaceuticals Ltd and BioMarin.

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. NONE

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. NONE

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. Consultant of child neurologist on NPC for Actelion during the last 5 years

  10. Mark E.S. Bailey, PhD and
    11. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. (1) RettCo Inc.

    Research Support, Government Entities:

    1. (1) Chief Scientist Office, Scottish Government Health Directorate, Grant no. ETM/334, co-I, 2014-2016 (2) Chief Scientist Office, Scottish Government Health Directorate, Development Work Grant no. CGA/16/3, co-I, 2016-2016

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. (1) CDKL5 UK (2) Rett Syndrome Research Trust (3) Rett Syndrome Association Scotland (4) Rosetrees Trust (5) Stoneygate Trust

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  11. Stuart R. Cobb, PhD
    12. Scientific Advisory Boards:

    1. NONE

    Gifts:

    1. NONE

    Funding for Travel or Speaker Honoraria:

    1. NONE

    Editorial Boards:

    1. NONE

    Patents:

    1. NONE

    Publishing Royalties:

    1. NONE

    Employment, Commercial Entity:

    1. NONE

    Consultancies:

    1. NONE

    Speakers' Bureaus:

    1. NONE

    Other Activities:

    1. NONE

    Clinical Procedures or Imaging Studies:

    1. NONE

    Research Support, Commercial Entities:

    1. NONE

    Research Support, Government Entities:

    1. (1) Chief Scientist Office,ETM334, PI,2014-2016

    Research Support, Academic Entities:

    1. NONE

    Research Support, Foundations and Societies:

    1. (1) CDKL5 UK (2) Rett Syndrome Research Trust (3) Rett Syndrome Association Scotland (4) Rosetrees Trust (5) RS Macdonald Charitable Trust

    Stock/Stock Options/Board of Directors Compensation:

    1. NONE

    License Fee Payments, Technology or Inventions:

    1. NONE

    Royalty Payments, Technology or Inventions:

    1. NONE

    Stock/Stock Options, Research Sponsor:

    1. NONE

    Stock/Stock Options, Medical Equipment & Materials:

    1. NONE

    Legal Proceedings:

    1. NONE

  1. From the Institute of Neuroscience & Psychology (R.D.H., S.R.C.), University of Glasgow, UK, Drs. Hector and Cobb are currently with the Patrick Wild Centre and Centre for Discovery Brain Science, University of Edinburgh, UK; Group Development and Disease (V.M.K., F.H.), Max Planck Institute for Molecular Genetics, Berlin, Germany; Telethon Kids Institute (H.L., J.D.), The University of Western Australia, Perth, Western Australia; School of Physiotherapy and Exercise Science (J.D.), Curtin University, Perth, Australia; Institute of Medical Genetics (A.C.), School of Medicine, Cardiff University, Cardiff, Wales, UK; Departments of Pediatrics, Pharmacology, Neurology and Otolaryngology (T.A.B.), University of Colorado School of Medicine, Aurora, CO; Paedriatic Neuroscience (J.A., M.P.), Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, Spain; Hospital Sant Joan de Déu Barcelona (J.A.), Esplugues de Llobregat, Spain; CIBERER (J.A.), Barcelona, Spain; Neuropediatrics (M.P.), Fundació Sant Joan de Déu, Esplugues de Llobregat, Spain; and School of Life Sciences (M.E.S.B.), College of Medical, Veterinary and Life Sciences, University of Glasgow, UK.
  1. Correspondence to Dr. Hector: ralph.hector{at}ed.ac.uk
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