Brief ReportDo damaging variants of SLC6A9, the gene for the glycine transporter 1 (GlyT-1), protect against schizophrenia?Curtis, Davida,,bAuthor Information aUCL Genetics Institute, University College London bCentre for Psychiatry, Queen Mary University of London, London, UK Received 31 January 2019 Accepted 22 June 2020 Correspondence to David Curtis, MD, UCL Genetics Institute, Darwin Building, Gower Street, London WC1E 6BT, UK, Tel: +44207377 7729; e-mail: firstname.lastname@example.org Psychiatric Genetics: October 2020 - Volume 30 - Issue 5 - p 150-152 doi: 10.1097/YPG.0000000000000260 Buy Metrics Abstract The aim of the investigation was to test whether genetic variants predicted to impair the functionality of SLC6A9, which codes for the GlyT-1 glycine transporter, are protective against schizophrenia. In an exome sequenced sample of 4225 schizophrenia cases and 5834 controls, variants occurring in SLC6A9 were annotated and weights were assigned using GENEVARASSOC. Genotype counts were compared using SCOREASSOC. Variants predicted to be deleterious by SIFT and damaging by PolyPhen were examined. Genotypes at 1:44466494-G/A seemed likely to be erroneous. If these were ignored then there were 15 damaging variants in controls and five in cases. The results are consistent with the hypothesis that variants which damage SLC6A9 are protective against schizophrenia but a larger sample would be required to confirm this. Copyright © 2020 Wolters Kluwer Health, Inc. All rights reserved.