MGAT4A and schizophrenia: Recent reports provide evidence for abnormal protein expression of a variety of functional categories of glycosylation enzyme in schizophrenia brain.52–55 Interestingly, reduced expression of the GlcNAc transferases B3GNT8 and MGAT4A has been identified.52 Defects in MGAT4A expression can influence the degree of glycan branching on substrate proteins and consequently their residence time in the plasma membrane.