In IBS patients, the GABAergic system is disrupted, and the levels of glutamate decarboxylase 2 (GAD2), GABA, and GABA receptors(including type B1 and B2) are decreased, while GABA transporter-2 (GAT-2) is increased in IBS-D patients (98). Here, SLC6A13 is linked to irritable bowel syndrome.