Plays a key role in maintaining the cardiac electrical stability by modulating cell surface expression of SCN5A (PubMed:32175648). May play a role in the modulation of anxiety behavior by regulating GABAergic neuronal system in the nucleus accumbens (By similarity). {ECO:0000250|UniProtKB:Q91VX9, ECO:0000269|PubMed:32175648}. This is the function of TMEM168 (transmembrane protein 168, ENSG00000146802).