{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n KCNIP3, also known as calsenilin or DREAM, is a multifunctional EF‐hand calcium‐binding protein that couples intracellular Ca²⁺ signals to both transcriptional regulation and membrane excitability. In the nucleus, KCNIP3 functions as a Ca²⁺‐dependent transcriptional repressor that modulates the expression of genes involved in neuroplasticity and cell survival—for example, by repressing prodynorphin and other downstream targets, as well as genes encoding key ion channels such as the L‑type Ca²⁺ channel (Ca(V)1.2) in cardiac myocytes (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " In response to increased intracellular Ca²⁺, conformational changes and dimerization promote its nuclear translocation, thereby relieving its DNA‐binding activity when appropriate (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": " Outside the nucleus, KCNIP3 interacts with voltage‐gated potassium channels—particularly members of the Kv4 family—to regulate channel trafficking, subunit assembly, and gating properties, which in turn shape neuronal excitability (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": " Furthermore, its physical interaction with presenilins and involvement in the regulation of amyloid precursor protein processing implicate it in Alzheimer’s disease pathology; indeed, altered expression of calsenilin/KCNIP3 has been observed in Alzheimer’s disease brains, where it may also contribute to apoptosis (see."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "7", "end_ref": "9"}]}, {"type": "t", "text": " In addition, modulation of its phosphorylation status via kinases such as GRK2/GRK6 further refines its regulatory impact on ion channels (see."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Through these complementary roles—in gene expression control and ion channel modulation—KCNIP3 integrates calcium‐dependent signals to influence synaptic plasticity, neuronal excitability, and cardiac function, thereby playing a pivotal role in both normal physiology and disease (see."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "14"}]}, {"type": "t", "text": "\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Jarkko J Ronkainen, Sandra L Hänninen, Topi Korhonen, et al. 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