{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n KCTD12, originally cloned as PFET1 and predominantly expressed in fetal tissues such as the cochlea and brain, encodes a protein containing a voltage‐gated potassium channel tetramerization (T1) domain that contributes to its developmental functions."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In the nervous system, KCTD12 functions as an auxiliary subunit of GABA(B) receptors where it modulates receptor signaling kinetics, influences the coupling to G‐proteins by interacting with the βγ subunits, and regulates receptor desensitization and surface expression. These actions have significant implications for neuronal excitability, synaptic transmission, and cognitive processes, and genetic association studies further implicate KCTD12 in neuropsychiatric conditions such as bipolar disorder and in traits like ruminative response style."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "2", "end_ref": "6"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In cancer biology, the role of KCTD12 appears to be context dependent. In cervical and lung cancer models, overexpression of KCTD12 has been shown to facilitate the G2/M cell cycle transition by binding to regulators such as CDC25B, which in turn activates CDK1 and Aurora A, thereby promoting cell proliferation and tumorigenesis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "7"}]}, {"type": "t", "text": " Conversely, in esophageal squamous cell carcinoma, ectopic expression of KCTD12 downregulates stem cell markers and attenuates signaling pathways (including WNT/NOTCH) that are associated with cell stemness and tumor aggressiveness."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": " In breast cancer, lower levels of KCTD12 correlate with aggressive disease features and poorer overall and recurrence‐free survival, with high KCTD12 expression being linked to immune response enrichment and better prognostic outcomes"}, {"type": "fg", "children": [{"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": ", while in lung adenocarcinoma, alterations in the miR‑429/LINC00365/KCTD12 axis modulate malignant phenotypes."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "11"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Outside of its roles in neuronal and cancer biology, evolutionary studies in Tibetan populations have nominated KCTD12 as a candidate gene potentially contributing to high‐altitude adaptation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "12"}]}, {"type": "t", "text": " Furthermore, structural and biochemical investigations have revealed that KCTD12 comprises distinct N‐ and C‐terminal domains—which are capable of oligomerizing and mediating interactions with GABA(B) receptor complexes—thereby influencing its regulatory performance."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "13"}, {"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these findings emphasize that KCTD12 has multifaceted roles ranging from the modulation of inhibitory neurotransmission to the regulation of cell cycle progression and tumorigenesis. It is emerging as a promising prognostic biomarker and potential therapeutic target in diverse pathophysiological contexts including neuropsychiatric disorders and various cancers."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}, {"type": "fg_f", "ref": "1"}, {"type": "fg_f", "ref": "7"}, {"type": "fg_f", "ref": "13"}, {"type": "fg_f", "ref": "4"}, {"type": "fg_f", "ref": "12"}, {"type": "fg_f", "ref": "5"}, {"type": "fg_f", "ref": "8"}, {"type": "fg_f", "ref": "6"}, {"type": "fg_f", "ref": "11"}, {"type": "fg_f", "ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Barbara L Resendes, Sharon F Kuo, Nahid G Robertson, et al. 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