Abstract: Disclosed are methods and compositions for treating a subject having a neurological disorder such as major depressive disorder (MDD). The methods and compositions may be utilized in order to inhibit trafficking of hyperpolarization-activated cyclic nucleotide gated (HCN) channels or subunits thereof, in some embodiments, by inhibiting an interaction between the HCN channels or the subunits thereof and an auxiliary protein or a chaperone protein for the HCN channels or the subunits thereof such as tetratricopeptide repeat (TPR)-containing Rab8b interacting (TRIP8b) protein or a variant thereof. The HCN channels of the disclosed methods may comprise, for example, HCN1 subunits, HCN2 subunits, or a combination thereof. In the disclosed methods, trafficking of the HCN channels or subunits preferably results in inhibiting distal dendritic enrichment of HCN1 and HCN2 in pyramidal neurons of hippocampal area CA1.