LRRTM4 (Leucine-Rich Repeat Transmembrane Neuronal 4): LRRTM4 encodes a transmembrane protein primarily expressed in neurones. It plays an important role in synaptic transmission and synaptic adhesion. Its localisation at synapses and interactions with other synaptic proteins highlight its significance in neural circuitry, neuronal connectivity, and potentially in neurodevelopmental disorders.