GBA1 and major depressive disorder: Lastly, the expression levels of the three genes exhibited associations with creatine kinase in individuals currently not affected by depression (see Table 4), displaying a notably stronger negative correlation among male healthy controls for GBA1 and UGCG (ρ = −0.410, p = 0.024 and ρ = −0.427, ρ = 0.023, respectively).