GRIK2 (Glutamate Ionotropic Receptor Kainate Type Subunit 2, also known as GluR6) is a Protein Coding gene. The GRIK2 (one of the kainate receptors) gene resides in a genetic linkage region (6q21) associated with bipolar disorder (BPD). The gene coding for GRIK2 has been suggested as a candidate gene for autism based on its localization in the autism-specific region on chromosome 6q21 and the involvement of receptor protein in cognitive functions like learning and memory. GRIK2 belongs to the glutamate-gated ion channel (TC 1.A.10.1) family. GRIK2 has a role in the maintenance of urothelial CSCs/CICs and that GRIK2 and ALDH1 can be prognosis prediction markers for urinary tract carcinomas.