{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n GRIP2 is a multi‐PDZ domain scaffold protein that plays several key roles in neuronal function by binding the C‐terminal tails of AMPA receptor subunits (particularly GluA2/GluA3) to regulate their trafficking and synaptic localization. In neurons, GRIP2—as a homolog of GRIP1—contributes to the activity‐dependent recycling of AMPA receptors and is essential for synaptic plasticity; for example, combined deletion of GRIP1 and GRIP2 impairs long‐term depression (LTD) in the cerebellum, indicating that the GRIP family is required for proper receptor internalization and synaptic modulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": " Furthermore, cloning and developmental expression studies demonstrate that GRIP2 expression in the central nervous system parallels that of AMPA receptors and further implicates its role in ensuring proper synaptic targeting of these receptors during later stages of neuronal maturation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Beyond its functions at mature synapses, GRIP2 mRNA is developmentally localized in Xenopus oocytes and early embryos where it is enriched in the germ plasm; interference with GRIP2 translation disrupts primordial germ cell migration and impairs motor behaviors, suggesting additional roles in early developmental signaling and cell motility."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "5"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n GRIP2 also emerges as a relevant partner in broader signaling networks. It serves as a binding target for the PDZ binding motifs of viral proteins (such as in tick‐borne encephalitis virus NS5) and interacts with components of intracellular signaling cascades (including those identified as shared partners for c‐Jun N‑terminal kinase isoforms), implying that GRIP2 may integrate synaptic receptor trafficking with diverse intracellular signals."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "6"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In addition, alterations in GRIP2-related pathways have been implicated in neurobehavioral abnormalities, including autism‐related social deficits, and even in non-neuronal contexts such as cancer prognosis, where GRIP2 appears as one component of a gene signature predicting recurrence risk in colon cancer."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "8"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Collectively, these studies highlight that GRIP2 functions as a critical adaptor that not only anchors and regulates AMPA receptor trafficking at excitatory (and in some contexts inhibitory) synapses to modulate synaptic strength and plasticity, but also participates in developmental processes and diverse signaling pathways that may have broader implications for neurodevelopmental and neuropsychiatric disorders.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Lifang Mao, Kogo Takamiya, Gareth Thomas, et al. "}, {"type": "b", "children": [{"type": "t", "text": "GRIP1 and 2 regulate activity-dependent AMPA receptor recycling via exocyst complex interactions."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Proc Natl Acad Sci U S A (2010)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1073/pnas.1013494107"}], "href": "https://doi.org/10.1073/pnas.1013494107"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "20956289"}], "href": "https://pubmed.ncbi.nlm.nih.gov/20956289"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Kogo Takamiya, Lifang Mao, Richard L Huganir, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The glutamate receptor-interacting protein family of GluR2-binding proteins is required for long-term synaptic depression expression in cerebellar Purkinje cells."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Neurosci (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1523/JNEUROSCI.0654-08.2008"}], "href": "https://doi.org/10.1523/JNEUROSCI.0654-08.2008"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "18509036"}], "href": "https://pubmed.ncbi.nlm.nih.gov/18509036"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "M Wyszynski, J G Valtschanoff, S Naisbitt, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Association of AMPA receptors with a subset of glutamate receptor-interacting protein in vivo."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Neurosci (1999)"}]}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "10414981"}], "href": "https://pubmed.ncbi.nlm.nih.gov/10414981"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "H Dong, P Zhang, I Song, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Characterization of the glutamate receptor-interacting proteins GRIP1 and GRIP2."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Neurosci (1999)"}]}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "10436050"}], "href": "https://pubmed.ncbi.nlm.nih.gov/10436050"}]}, {"type": "r", "ref": 5, "children": [{"type": "t", "text": "Pavel Kirilenko, Frida K Weierud, Aaron M Zorn, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The efficiency of Xenopus primordial germ cell migration depends on the germplasm mRNA encoding the PDZ domain protein Grip2."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Differentiation (2008)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1111/j.1432-0436.2007.00229.x"}], "href": "https://doi.org/10.1111/j.1432-0436.2007.00229.x"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17924960"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17924960"}]}, {"type": "r", "ref": 6, "children": [{"type": "t", "text": "Wessam Melik, Karin Ellencrona, Michael Wigerius, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Two PDZ binding motifs within NS5 have roles in Tick-borne encephalitis virus replication."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Virus Res (2012)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.virusres.2012.07.001"}], "href": "https://doi.org/10.1016/j.virusres.2012.07.001"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "22796133"}], "href": "https://pubmed.ncbi.nlm.nih.gov/22796133"}]}, {"type": "r", "ref": 7, "children": [{"type": "t", "text": "Wei-Kai Chen, Yvonne Y C Yeap, Marie A Bogoyevitch "}, {"type": "b", "children": [{"type": "t", "text": "The JNK1/JNK3 interactome--contributions by the JNK3 unique N-terminus and JNK common docking site residues."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2014)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2014.09.122"}], "href": "https://doi.org/10.1016/j.bbrc.2014.09.122"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "25301550"}], "href": "https://pubmed.ncbi.nlm.nih.gov/25301550"}]}, {"type": "r", "ref": 8, "children": [{"type": "t", "text": "Mei Han, Rebeca Mejias, Shu-Ling Chiu, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Mice lacking GRIP1/2 show increased social interactions and enhanced phosphorylation at GluA2-S880."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Behav Brain Res (2017)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbr.2016.12.042"}], "href": "https://doi.org/10.1016/j.bbr.2016.12.042"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "28063882"}], "href": "https://pubmed.ncbi.nlm.nih.gov/28063882"}]}, {"type": "r", "ref": 9, "children": [{"type": "t", "text": "Janek Kibat, Thomas Schirrmann, Matthias J Knape, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Utilisation of antibody microarrays for the selection of specific and informative antibodies from recombinant library binders of unknown quality."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "N Biotechnol (2016)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.nbt.2015.12.003"}], "href": "https://doi.org/10.1016/j.nbt.2015.12.003"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26709003"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26709003"}]}]}]}