The author Hartwig Wolburg should have been included on the author list in the version originally published (Human Molecular Genetics, 2016, 25 (3), 459–471). This author has been included in the updated list above.

Author notes

The authors wish it to be known that, in their opinion the first two authors should be regarded as joint authors.

Present address: Ann Romney Center for Neurologic Diseases, Brigham and Women s Hospital and Harvard Medical School, Boston, MA, USA.

The authors wish it to be known that, in their opinion the last two authors should be regarded as joint senior authors.