The function of Ensembl gene identifier ENSG00000103978 (TMEM87A, transmembrane protein 87A) is as follows. Voltage- and pH-dependent, inwardly rectifying cation channel that mediates ion flux across the Golgi membrane, supporting luminal acidification necessary for normal Golgi morphology and function (PubMed:38992057). Implicated in normal touch sensitivity through the generation of mechanically activated currents (PubMed:32228863, PubMed:38422143). Could also be involved in cell mechanosensitivity regulating cell adhesion and migration (PubMed:32228863). May also be involved in retrograde transport from endosomes to the trans-Golgi network (TGN) (PubMed:26157166). Contributes to hippocampal spatial and contextual memory by maintaining Golgi function and structural integrity in hippocampal neurons (By similarity). {ECO:0000250|UniProtKB:Q8BXN9, ECO:0000269|PubMed:26157166, ECO:0000269|PubMed:32228863, ECO:0000269|PubMed:38422143}.