SDCCAG8 and schizophrenia: Furthermore, existing GWASs have linked genetic variation in SDCCAG8 with several brain‐related phenotypes at genome‐wide significant levels, including schizophrenia (Lam et al., 2019), educational attainment (Okbay et al., 2022), cognitive performance (Lam et al., 2017), and risk‐taking behavior (Karlsson Linnér et al., 2019).