PRDM13 (PR/SET domain 13) is a transcriptional regulator that functions as a critical determinant of neuronal cell fate specification, particularly in GABAergic inhibitory neuron development. The protein acts downstream of the transcription factor PTF1A to suppress alternative glutamatergic excitatory neuronal fates while promoting GABAergic lineages 1. In the cerebellum, PRDM13 is essential for specification of PAX2+ interneuron and Purkinje cell inhibitory neuronal lineages, with deficiency leading to increased TLX3+ excitatory neuronal lineages and cerebellar hypoplasia 12. PRDM13 also plays a crucial role in hypothalamic development, specifically in the differentiation of Kiss1-expressing neurons in the arcuate nucleus that regulate reproductive function 2. The protein is highly expressed in the dorsomedial hypothalamus where it contributes to sleep quality regulation and metabolic homeostasis 3. Clinically, recessive PRDM13 mutations cause a syndrome characterized by intellectual disability, cerebellar hypoplasia, congenital hypogonadotropic hypogonadism, and ataxia 24. Additionally, duplications affecting PRDM13 regulatory regions cause North Carolina macular dystrophy, a congenital retinal malformation 56. The gene may also function as a tumor suppressor, as overexpression inhibits glioma cell proliferation and invasion through DLC1 upregulation 7.