{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n CC2D1A, also known as Freud‐1 or Aki1, is an evolutionarily conserved multi‐domain protein defined by multiple DM14 motifs and a C2 domain. It plays a dual role in the central nervous system by regulating gene transcription and intracellular signaling. On one hand, CC2D1A functions as a transcriptional repressor of the serotonin‐1A (5‑HT1A) receptor gene, thereby modulating serotonergic tone and contributing to the regulation of mood and anxiety. This repressive activity, which is subject to calcium‐dependent modulation, has been implicated in the pathophysiology of major depression and other mood disorders."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n On the other hand, CC2D1A is essential for proper neurodevelopment. Loss‐of‐function mutations in CC2D1A cause autosomal recessive nonsyndromic intellectual disability and have been linked to autism spectrum disorders. Studies in human families and conditional knockout mouse models have revealed that CC2D1A deficiency disrupts dendritic organization and synaptic maturation, resulting in cognitive impairments and social deficits that exhibit sex‐specific patterns."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "4", "end_ref": "9"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition to its transcriptional role, CC2D1A acts as a signaling scaffold linking extracellular cues to intracellular effectors. It promotes activation of the NF‑κB pathway through canonical IKK signaling involving proteins such as TRAF2, TAK1, and Ubc13, thus impacting cell survival and neuronal function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "10"}]}, {"type": "t", "text": " Moreover, CC2D1A directly interacts with components of the ESCRT‐III complex (for instance, CHMP4B), where it regulates endosomal trafficking and membrane remodeling events; this interaction has implications for processes ranging from viral budding to endocytic dynamics."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "11", "end_ref": "13"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n \n "}, {"type": "p", "children": [{"type": "t", "text": "\n Finally, analysis of the CC2D1A gene family, which includes its paralog CC2D1B, supports a conserved role in integrating membrane dynamics with intracellular signaling cascades critical for neuronal development and function."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "14"}]}, {"type": "t", "text": " Collectively, these findings underscore that CC2D1A is a multifaceted regulator whose coordinated control of transcription, signal transduction, and endosomal morphogenesis is essential for proper brain development and function, making it a promising target for therapeutic interventions in neurodevelopmental and mood disorders.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Paul R Albert, Sylvie Lemonde "}, {"type": "b", "children": [{"type": "t", "text": "5-HT1A receptors, gene repression, and depression: guilt by association."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Neuroscientist (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1177/1073858404267382"}], "href": "https://doi.org/10.1177/1073858404267382"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15534042"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15534042"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Paul R Albert, Brice Le François, Anne M Millar "}, {"type": "b", "children": [{"type": "t", "text": "Transcriptional dysregulation of 5-HT1A autoreceptors in mental illness."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Brain (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1186/1756-6606-4-21"}], "href": "https://doi.org/10.1186/1756-6606-4-21"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21619616"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21619616"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Xiao-Ming Ou, Sylvie Lemonde, Hamed Jafar-Nejad, et al. 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