This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as doi: 10.1002/humu.24118. This article is protected by copyright. All rights reserved. Accepted Article Adam Hansen ORCID iD: 0000-0001-8123-2679 Daryl Scott ORCID iD: 0000-0003-1460-5169 Jennifer Posey ORCID iD: 0000-0003-4814-6765 James R. Lupski ORCID iD: 0000-0001-9907-9246 Phenotypic Expansion in KIF1A-related Dominant Disorders: A Description of Novel Variants and Review of Published Cases Ximena Montenegro-Garreaud* † , 1-3 Adam W. Hansen* † , 3,4 Michael M. Khayat, 3,4 Varuna Chander, 3,4 Christopher M. Grochowski, 4 Yunyun Jiang, 3 He Li 3 , Tadahiro Mitani 4 , Elena Kessler, 5 Joy Jayaseelan, 3 Hua Shen, 3 Alper Gezdirici, 6 Davut Pehlivan, 4,7 Qingchang Meng, 3 Jill A. Rosenfeld 4 , Shalini N Jhangiani, 3 Suneeta Madan-Khetarpal, 5 Daryl A. Scott, 4,8,9 Hugo Abarca-Barriga, 1,10 Milana Trubnykova, 1,11 Marie-Claude Gingras, 3,4,12 Donna M. Muzny, 3,4 Jennifer E. Posey, 4 Pengfei Liu, 4,13 James R. Lupski, 3,4,8,14 Richard Gibbs 3,4 Affiliations: 1 Servicio de Genética y Errores Innatos del Metabolismo, Instituto Nacional de Salud del Niño, Lima, Peru. 2 Oncogenomics, Lima, Peru. 3 Human Genome Sequencing Center, Baylor College of Medicine, Houston, Texas, 77030, USA. 4 Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, Texas, 77030, USA.