GDNF and schizophrenia: The fact that this microRNA is widely expressed in the hippocampus and various cortical areas [35] implies that hsa-miR-1185-1-3p might regulate GDNF expression in the brain, and individuals possessing the ‘G’ risk allele express lower amounts of GDNF levels, rendering them more vulnerable to the disease as early as during embryonic development, a critical period according to the neurodevelopmental hypothesis of schizophrenia.