SLC33A1 and Spastic paraplegia: A loss‐of‐function mutation in ACATN1/SLC33A1 has been associated with spastic paraplegia (SPG42, [http://www.ncbi.nlm.nih.gov/pubmed/19061983?dopt=AbstractPlus]), although this observation could not be replicated in a subsequent study [http://www.ncbi.nlm.nih.gov/pubmed/20461110?dopt=AbstractPlus].