Many previous animal, postmortem, and clinical studies have suggested that BDNF level decreases in patients with depression‐like behavior and impaired neurogenesis phenomena (Emon et al., 2020; Lorenzetti et al., 2020; Murínová et al., 2017; Nunes et al., 2018; Sheldrick et al., 2017). Here, BDNF is linked to major depressive disorder.