Deep Sequencing Regarding R105, a Mosaic Variant in MECP2 Exon 1
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Nav 1.1 Channels in Axon Initial Segments of Bipolar Cells Augment
The Journal of Neuroscience, October 9, 2013 • 33(41):16045–16059 • 16045 Systems/Circuits NaV1.1 Channels in Axon Initial Segments of Bipolar Cells Augment Input to Magnocellular Visual Pathways in the Primate Retina Theresa Puthussery,1 Sowmya Venkataramani,1 Jacqueline Gayet-Primo,1 Robert G. Smith,2 and W. Rowland Taylor1 1Casey Eye Institute, Department of Ophthalmology, Oregon Health & Science University, Portland, Oregon 97239, and 2Department of Neuroscience, University of Pennsylvania, Philadelphia, Pennsylvania 19104 In the primate visual system, the ganglion cells of the magnocellular pathway underlie motion and flicker detection and are relatively transient,whilethemoresustainedganglioncellsoftheparvocellularpathwayhavecomparativelylowertemporalresolution,butencode higher spatial frequencies. Although it is presumed that functional differences in bipolar cells contribute to the tuning of the two pathways, the properties of the relevant bipolar cells have not yet been examined in detail. Here, by making patch-clamp recordings in acuteslicesofmacaqueretina,weshowthatthebipolarcellswithinthemagnocellularpathway,butnottheparvocellularpathway,exhibit voltage-gated sodium (NaV ), T-type calcium (CaV ), and hyperpolarization-activated, cyclic nucleotide-gated (HCN) currents, and can generate action potentials. Using immunohistochemistry in macaque and human retinae, we show that NaV1.1 is concentrated in an axon initial segment (AIS)-like region of magnocellular pathway bipolar cells, a specialization not seen in transient bipolar cells of other vertebrates. In contrast, CaV3.1 channels were localized to the somatodendritic compartment and proximal axon, but were excluded from the AIS, while HCN1 channels were concentrated in the axon terminal boutons. Simulations using a compartmental model reproduced physiological results and indicate that magnocellular pathway bipolar cells initiate spikes in the AIS. Finally, we demonstrate that NaV channels in bipolar cells augment excitatory input to parasol ganglion cells of the magnocellular pathway. -
Genetic Associations Between Voltage-Gated Calcium Channels (Vgccs) and Autism Spectrum Disorder (ASD)
Liao and Li Molecular Brain (2020) 13:96 https://doi.org/10.1186/s13041-020-00634-0 REVIEW Open Access Genetic associations between voltage- gated calcium channels and autism spectrum disorder: a systematic review Xiaoli Liao1,2 and Yamin Li2* Abstract Objectives: The present review systematically summarized existing publications regarding the genetic associations between voltage-gated calcium channels (VGCCs) and autism spectrum disorder (ASD). Methods: A comprehensive literature search was conducted to gather pertinent studies in three online databases. Two authors independently screened the included records based on the selection criteria. Discrepancies in each step were settled through discussions. Results: From 1163 resulting searched articles, 28 were identified for inclusion. The most prominent among the VGCCs variants found in ASD were those falling within loci encoding the α subunits, CACNA1A, CACNA1B, CACN A1C, CACNA1D, CACNA1E, CACNA1F, CACNA1G, CACNA1H, and CACNA1I as well as those of their accessory subunits CACNB2, CACNA2D3, and CACNA2D4. Two signaling pathways, the IP3-Ca2+ pathway and the MAPK pathway, were identified as scaffolds that united genetic lesions into a consensus etiology of ASD. Conclusions: Evidence generated from this review supports the role of VGCC genetic variants in the pathogenesis of ASD, making it a promising therapeutic target. Future research should focus on the specific mechanism that connects VGCC genetic variants to the complex ASD phenotype. Keywords: Autism spectrum disorder, Voltage-gated calcium -
Autoantibodies in Neurological Diseases
Autoantibodies in neurological diseases Hu, Ri, Yo, Tr CV2 Amphiphysin Amphiphysin GM1 Ma/Ta CV2 Amphiphysin Cerebellum Intestine Hippocampus Control transfection CV2 GM2 SOX1 PNMAP 2 (MMa2/Ta) Zic4 PNMP A2 GM3G ITPR1 (MMa2/Ta) RiR CARP YoY RiR GD1G a GAD Hippocampus HEp-2 cells Cerebellum NMDAR (transf. cells) Recoverin HuH Titin Anti-Hu positive Anti-NMDA-receptor positive YoY GD1G b Recoverin Gangliosides MAG HuH GT1b SOS X1 Myelin Aquaporin-4 Titin GQ1G b MOG Zic4 VGKC (LGI1 + CASPR2) Cerebellum Intestine Cerebellum Control transfection NMDA receptors GAD65G AMPA receptors Tr (DNER) GABAB receptors DPPX Control CoC ntrol CoC ntrol IgLON5 Hippocampus HEp-2 cells Optic nerve AQP-4 (transf. cells) Glycine receptors Anti-Yo positive Anti-aquaporin-4 positive AChR Indirect immunofl uorescence EUROLINE Examples of relevant target antigens EUROIMMUN AG · Seekamp 31 · 23560 Lübeck (Germany) · Tel +49 451/5855-0 · Fax 5855-591 · [email protected] · www.euroimmun.com 2 Autoantibodies IIFT pattern Test systems Anti-Hu (ANNA-1*) IIFT: Granular fl uorescence of almost all neuronal nuclei on the substrates cerebellum and hippocampus. The Autoantibodies against basic, RNA- cell nuclei of the plexus myentericus (intestinal tissue) binding proteins of the neuronal cell are also positive. nuclei of the central and peripheral nervous system EUROLINE: Positive reaction of the recombinant Hu antigen (HuD). Associated diseases: encephalomyelitis, subacute sensory neuronopathy (Denny-Brown syndrome), autonomous neuropathy Associated tumours: small-cell lung carcinoma, Cerebellum Intestine neuroblastoma Anti-Ri (ANNA-2*) IIFT: Granular fl uorescence of almost all neuronal nuclei on the substrates cerebellum and hippocampus. The Autoantibodies against neuronal cell substrate intestine (plexus myentericus) shows no reac- nuclei of the central nervous system tion. -
The Mineralocorticoid Receptor Leads to Increased Expression of EGFR
www.nature.com/scientificreports OPEN The mineralocorticoid receptor leads to increased expression of EGFR and T‑type calcium channels that support HL‑1 cell hypertrophy Katharina Stroedecke1,2, Sandra Meinel1,2, Fritz Markwardt1, Udo Kloeckner1, Nicole Straetz1, Katja Quarch1, Barbara Schreier1, Michael Kopf1, Michael Gekle1 & Claudia Grossmann1* The EGF receptor (EGFR) has been extensively studied in tumor biology and recently a role in cardiovascular pathophysiology was suggested. The mineralocorticoid receptor (MR) is an important efector of the renin–angiotensin–aldosterone‑system and elicits pathophysiological efects in the cardiovascular system; however, the underlying molecular mechanisms are unclear. Our aim was to investigate the importance of EGFR for MR‑mediated cardiovascular pathophysiology because MR is known to induce EGFR expression. We identifed a SNP within the EGFR promoter that modulates MR‑induced EGFR expression. In RNA‑sequencing and qPCR experiments in heart tissue of EGFR KO and WT mice, changes in EGFR abundance led to diferential expression of cardiac ion channels, especially of the T‑type calcium channel CACNA1H. Accordingly, CACNA1H expression was increased in WT mice after in vivo MR activation by aldosterone but not in respective EGFR KO mice. Aldosterone‑ and EGF‑responsiveness of CACNA1H expression was confrmed in HL‑1 cells by Western blot and by measuring peak current density of T‑type calcium channels. Aldosterone‑induced CACNA1H protein expression could be abrogated by the EGFR inhibitor AG1478. Furthermore, inhibition of T‑type calcium channels with mibefradil or ML218 reduced diameter, volume and BNP levels in HL‑1 cells. In conclusion the MR regulates EGFR and CACNA1H expression, which has an efect on HL‑1 cell diameter, and the extent of this regulation seems to depend on the SNP‑216 (G/T) genotype. -
The Metabotropic Glutamate Receptor Mglur1 Regulates the Voltage-Gated Potassium Channel Kv1.2 Through Agonist-Dependent and Agonist-Independent Mechanisms
University of Vermont ScholarWorks @ UVM Graduate College Dissertations and Theses Dissertations and Theses 2019 The etM abotropic glutamate receptor mGluR1 regulates the voltage-gated potassium channel Kv1.2 through agonist-dependent and agonist- independent mechanisms Sharath Chandra Madasu University of Vermont Follow this and additional works at: https://scholarworks.uvm.edu/graddis Part of the Cell Biology Commons, Neuroscience and Neurobiology Commons, and the Pharmacology Commons Recommended Citation Madasu, Sharath Chandra, "The eM tabotropic glutamate receptor mGluR1 regulates the voltage-gated potassium channel Kv1.2 through agonist-dependent and agonist-independent mechanisms" (2019). Graduate College Dissertations and Theses. 982. https://scholarworks.uvm.edu/graddis/982 This Dissertation is brought to you for free and open access by the Dissertations and Theses at ScholarWorks @ UVM. It has been accepted for inclusion in Graduate College Dissertations and Theses by an authorized administrator of ScholarWorks @ UVM. For more information, please contact [email protected]. THE METABOTROPIC GLUTAMATE RECEPTOR MGLUR1 REGULATES THE VOLTAGE-GATED POTASSIUM CHANNEL KV1.2 THROUGH AGONIST-DEPENDENT AND AGONIST-INDEPENDENT MECHANISMS. A Dissertation Presented by Sharath Chandra Madasu to The Faculty of the Graduate College of The University of Vermont In Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Specializing in Cellular Molecular and Biomedical Science January, 2019 Defense Date: September 27, 2018 Dissertation Examination Committee: Anthony D. Morielli, PhD., Advisor John Green, PhD., Chairperson Karen Lounsbury, Ph.D. Benedek Erdos, PhD. Cynthia J. Forehand, Ph.D., Dean of the Graduate College ABSTRACT The voltage gated potassium channel Kv1.2 plays a key role in the central nervous system and mutations in Kv1.2 cause neurological disorders such as epilepsies and ataxias. -
Oegtp - Epilepsy Test Requisition Lab Use Only: Patient Information
OEGTP - EPILEPSY TEST REQUISITION LAB USE ONLY: PATIENT INFORMATION: Received date: Name: Notes: Address: Date of Birth: YY/MM/DD Sex: M F Health Card No: TEST REQUEST: See page 2 for gene list for each of the panels below Epilepsy Comprehensive panel: 167 genes Childhood Onset Epilepsy panel: 45 genes Focal Epilepsy panel: 14 genes Brain Malformation Epilepsy panel: 44 genes London Health Sciences Centre – (Molecular Genetics) London Health Sciences Centre Progressive Myoclonic Epilepsy panel: 20 genes Actionable Gene Epilepsy panel: 22 genes Early Infantile Epilepsy panel: 51 genes Single gene test: Carrier Testing/ KnownFamily Mutation SAMPLE COLLECTION: Name of index case in the family (include copy of report) Date drawn: YY/MM/DD EDTA blood (lavender top) (5ml at room temp) Affected Unaffected Date of Birth: Relationship to patient: REFERRING PHYSICIAN: Authorized Signature is Required Gene: RefSeq:NM Physician Name (print): Mutation: Signature: Email: REASON FOR REFERRAL: Clinic/Hospital: Diagnostic Testing Address: Clinical Diagnosis: Telephone: Fax: CC report to: Name: Clinical Presentation: Address: Telephone: Fax: Molecular Genetics Laboratory Victoria Hospital, Room B10-123A 800 Commissioners Rd. E. London, Ontario | N6A 5W9 Pathology and Laboratory Medicine Ph: 519-685-8122 | Fax: 519-685-8279 Page 1 of 6 Page OEGTP (2021/05/28) OEGTP - EPILEPSY TEST PANELS Patient Identifier: COMPREHENSIVE EPILEPSY PANEL: 167 Genes ACTB, ACTG1, ADSL, AKT3, ALDH7A1, AMT, AP3B2, ARFGEF2, ARHGEF9, ARV1, ARX, ASAH1, ASNS, ATP1A3, ATP6V0A2, ATP7A, -
Transcriptome Sequencing and Genome-Wide Association Analyses Reveal Lysosomal Function and Actin Cytoskeleton Remodeling in Schizophrenia and Bipolar Disorder
Molecular Psychiatry (2015) 20, 563–572 © 2015 Macmillan Publishers Limited All rights reserved 1359-4184/15 www.nature.com/mp ORIGINAL ARTICLE Transcriptome sequencing and genome-wide association analyses reveal lysosomal function and actin cytoskeleton remodeling in schizophrenia and bipolar disorder Z Zhao1,6,JXu2,6, J Chen3,6, S Kim4, M Reimers3, S-A Bacanu3,HYu1, C Liu5, J Sun1, Q Wang1, P Jia1,FXu2, Y Zhang2, KS Kendler3, Z Peng2 and X Chen3 Schizophrenia (SCZ) and bipolar disorder (BPD) are severe mental disorders with high heritability. Clinicians have long noticed the similarities of clinic symptoms between these disorders. In recent years, accumulating evidence indicates some shared genetic liabilities. However, what is shared remains elusive. In this study, we conducted whole transcriptome analysis of post-mortem brain tissues (cingulate cortex) from SCZ, BPD and control subjects, and identified differentially expressed genes in these disorders. We found 105 and 153 genes differentially expressed in SCZ and BPD, respectively. By comparing the t-test scores, we found that many of the genes differentially expressed in SCZ and BPD are concordant in their expression level (q ⩽ 0.01, 53 genes; q ⩽ 0.05, 213 genes; q ⩽ 0.1, 885 genes). Using genome-wide association data from the Psychiatric Genomics Consortium, we found that these differentially and concordantly expressed genes were enriched in association signals for both SCZ (Po10 − 7) and BPD (P = 0.029). To our knowledge, this is the first time that a substantially large number of genes show concordant expression and association for both SCZ and BPD. Pathway analyses of these genes indicated that they are involved in the lysosome, Fc gamma receptor-mediated phagocytosis, regulation of actin cytoskeleton pathways, along with several cancer pathways. -
Cdk15 Igfals Lingo4 Gjb3 Tpbg Lrrc38 Serpinf1 Apod Trp73 Lama4 Chrnd Col9a1col11a1col5a2 Fgl2 Pitx2 Col2a1 Col3a1 Lamb3 Col24a1
Bnc2 Wdr72 Ptchd1 Abtb2 Spag5 Zfp385a Trim17 Ier2 Il1rapl1 Tpd52l1 Fam20a Car8 Syt5 Plxnc1 Sema3e Ndrg4 Snph St6galnac5 Mcpt2 B3galt2 Sphkap Arhgap24 Prss34 Lhfpl2 Ermap Rnf165 Shroom1 Grm4 Mobp Dock2 Tmem9b Slc35d3 Otud7b Serpinb3a Sh3d19 Syt6 Zan Trim67 Clec18a Mcoln1 Tob1 Slc45a2 Pcdhb9 Pcdh17 Plscr1 Gpr143 Cela1 Frem1 Sema3f Lgi2 Igsf9 Fjx1 Cpne4 Adgb Depdc7 Gzmm C1qtnf5 Capn11 Sema3c H2-T22 Unc5c Sytl4 Galnt5 Sytl2 Arhgap11a Pcdha1 Cdh20 Slc35f2 Trim29 B3gnt5 Dock5 Trim9 Padi4 Pcdh19 Abi2 Cldn11 Slitrk1 Fam13a Nrgn Cpa4 Clmp Il1rap Trpm1 Fat4 Nexn Pmel Mmp15 Fat3 H2-M5 Prss38 Wdr41 Prtg Mlana Mettl22 Tnrc6b Cdh6 Sema3b Ptgfrn Cldn1 Cntn4 Bcl2a1b Capn6 Capn5 Pcdhb19 Tcf15 Bmf Rgs8 Tecrl Tyrp1 Rhot1 Rnf123 Cldn6 Adam9 Hlx Rilpl1 Disp1 Atcay Vwc2 Fat2 Srpx2 Cldn3 Unc13c Creb3l1 Rab39b Robo3 Gpnmb Bves Orai2 Slc22a2 Prss8 Cdh10 Scg3 Adam33 Nyx Dchs1 Chmp4c Syt9 Ap1m2 Megf10 Cthrc1 Penk Igsf9b Akap2 Ltbp3 Dnmbp Tff2 Pnoc Vldlr Cpa3 Snx18 Capn3 Btla Htr1b Gm17231 Pcdh9Rab27a Grm8 Cnih2 Scube2 Id2 Reep1 Cpeb3 Mmp16 Slc18b1 Snx33 Clcn5 Cckbr Pkp2 Drp2 Mapk8ip1 Lrrc3b Cxcl14 Zfhx3 Esrp1 Prx Dock3 Sec14l1 Prokr1 Pstpip2 Usp2 Cpvl Syn2 Ntn1 Ptger1 Rxfp3 Tyr Snap91 Htr1d Mtnr1a Gadd45g Mlph Drd4 Foxc2 Cldn4 Birc7 Cdh17 Twist2 Scnn1b Abcc4 Pkp1 Dlk2 Rab3b Amph Mreg Il33 Slit2 Hpse Micu1 Creb3l2 Dsp Lifr S1pr5 Krt15 Svep1 Ahnak Kcnh1 Sphk1 Vwce Clcf1 Ptch2 Pmp22 Sfrp1 Sema6a Lfng Hs3st5 Efcab1 Tlr5 Muc5acKalrn Vwa2 Fzd8 Lpar6 Bmp5 Slc16a9 Cacng4 Arvcf Igfbp2 Mrvi1 Dusp15 Krt5 Atp13a5 Dsg1a Kcnj14 Edn3Memo1 Ngef Prickle2 Cma1 Alx4 Bmp3 Blnk GastAgtr2 -
Characterizing the Mechanisms of Kappa Opioid Receptor Signaling Within Mesolimbic Dopamine Circuitry Katie Reichard a Dissertat
Characterizing the mechanisms of kappa opioid receptor signaling within mesolimbic dopamine circuitry Katie Reichard A dissertation submitted in partial fulfillment of the degree requirements for the degree of: Doctor of Philosophy University of Washington 2020 Reading Committee: Charles Chavkin, Chair Paul Phillips Larry Zweifel Program Authorized to Confer Degree: Neuroscience Graduate Program TABLE OF CONTENTS Summary/Abstract………………………………………………………………………….……..6 Dedication……………………………………………………………………………….………...9 Chapter 1 The therapeutic potential of the targeting the kappa opioid receptor system in stress- associated mental health disorders……………………………….………………………………10 Section 1.1 Activation of the dynorphin/kappa opioid receptor system is associated with dysphoria, cognitive disruption, and increased preference for drugs of abuse…………………..13 Section 1.2 Contribution of the dyn/KOR system to substance use disorder, anxiety, and depression………………………………………………………………………………………..15 Section 1.3 KORs are expressed on dorsal raphe serotonin neurons and contribute to stress- induced plasticity with serotonin circuitry……………………………………………………….17 Section 1.4 Kappa opioid receptor expression in the VTA contributes to the behavioral response to stress……………………………………………………………………………………....…..19 Section 1.5 Other brain regions contributing to the KOR-mediated response to stress…………23 Section 1.6 G Protein signaling at the KOR …………………………………………………….25 Chapter 2: JNK-Receptor Inactivation Affects D2 Receptor through both agonist action and norBNI-mediated cross-inactivation -
1 De Novo Mutations in HCN1 Cause Early Infantile Epileptic
De novo mutations in HCN1 cause early infantile epileptic encephalopathy Caroline Nava,1-4,24, Carine Dalle5,24, Agnès Rastetter1, Pasquale Striano6,23, Carolien G.F. de Kovel7, Rima Nabbout8,9, Claude Cancès10, Dorothée Ville11, Eva H. Brilstra7, Giuseppe Gobbi12, Emmanuel Raffo13, Delphine Bouteiller14, Yannick Marie14, Oriane Trouillard1,3,4, Angela Robbiano15, Boris Keren16, Dahbia Agher1, Emmanuel Roze1-3, Suzanne Lesage1-3, Aude Nicolas1-3, Alexis Brice1-4, Michel Baulac1-3, Cornelia Vogt17, Nady El Hajj17, Eberhard Schneider17, Arvid Suls18,19,23, Sarah Weckhuysen18,19,23, Padhraig Gormley20,23, Anna-Elina Lehesjoki21,23, Peter De Jonghe18,19,23, Ingo Helbig22,23, Stéphanie Baulac1-3,23, Federico Zara15,23, Bobby P.C. Koeleman7,23, EuroEPINOMICS RES consortium, Thomas Haaf17, Eric LeGuern1-4,23, and Christel Depienne1,3,17,23 1 Institut National de la Santé et de la Recherche Médicale (INSERM) UMR 975, Institut du cerveau et de la moelle épinière (ICM), Hôpital Pitié-Salpêtrière, Paris, France. 2 CNRS 7225, Hôpital Pitié-Salpêtrière, Paris, France. 3 Université Pierre et Marie Curie-Paris-6 (UPMC), UMR_S 975, Paris, France. 4 AP-HP, Hôpital Pitié-Salpêtrière, Département de Génétique et de Cytogénétique, Unité Fonctionnelle de Neurogénétique moléculaire et cellulaire, Paris, France. 5 ICM, Institut du cerveau et de la moelle épinière, Plateforme d’électrophysiologie, Paris, France. 6 Pediatric Neurology and Muscular Diseases Unit, Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova and Gaslini Institute, Genova, Italy. 7 Department of Medical Genetics, University Medical Center Utrecht, Utrecht, The Netherlands. 8 Department of Pediatric Neurology, Centre de Reference Epilepsies Rares, Hôpital Necker–Enfants Malades, Assistance Publique–Hôpitaux de Paris (AP-HP), Paris, France. -
Research Article Microarray-Based Comparisons of Ion Channel Expression Patterns: Human Keratinocytes to Reprogrammed Hipscs To
Hindawi Publishing Corporation Stem Cells International Volume 2013, Article ID 784629, 25 pages http://dx.doi.org/10.1155/2013/784629 Research Article Microarray-Based Comparisons of Ion Channel Expression Patterns: Human Keratinocytes to Reprogrammed hiPSCs to Differentiated Neuronal and Cardiac Progeny Leonhard Linta,1 Marianne Stockmann,1 Qiong Lin,2 André Lechel,3 Christian Proepper,1 Tobias M. Boeckers,1 Alexander Kleger,3 and Stefan Liebau1 1 InstituteforAnatomyCellBiology,UlmUniversity,Albert-EinsteinAllee11,89081Ulm,Germany 2 Institute for Biomedical Engineering, Department of Cell Biology, RWTH Aachen, Pauwelstrasse 30, 52074 Aachen, Germany 3 Department of Internal Medicine I, Ulm University, Albert-Einstein Allee 11, 89081 Ulm, Germany Correspondence should be addressed to Alexander Kleger; [email protected] and Stefan Liebau; [email protected] Received 31 January 2013; Accepted 6 March 2013 Academic Editor: Michael Levin Copyright © 2013 Leonhard Linta et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Ion channels are involved in a large variety of cellular processes including stem cell differentiation. Numerous families of ion channels are present in the organism which can be distinguished by means of, for example, ion selectivity, gating mechanism, composition, or cell biological function. To characterize the distinct expression of this group of ion channels we have compared the mRNA expression levels of ion channel genes between human keratinocyte-derived induced pluripotent stem cells (hiPSCs) and their somatic cell source, keratinocytes from plucked human hair. This comparison revealed that 26% of the analyzed probes showed an upregulation of ion channels in hiPSCs while just 6% were downregulated. -
IP3-Mediated Gating Mechanism of the IP3 Receptor Revealed by Mutagenesis and X-Ray Crystallography
IP3-mediated gating mechanism of the IP3 receptor revealed by mutagenesis and X-ray crystallography Kozo Hamadaa, Hideyuki Miyatakeb, Akiko Terauchia, and Katsuhiko Mikoshibaa,1 aLaboratory for Developmental Neurobiology, Brain Science Institute, RIKEN, Saitama 351-0198, Japan; and bNano Medical Engineering Laboratory, RIKEN, Saitama 351–0198, Japan Edited by Solomon H. Snyder, Johns Hopkins University School of Medicine, Baltimore, MD, and approved March 24, 2017 (received for review January 26, 2017) The inositol 1,4,5-trisphosphate (IP3) receptor (IP3R) is an IP3-gated communicate with the channel at a long distance remains ion channel that releases calcium ions (Ca2+) from the endoplasmic unknown, however. reticulum. The IP3-binding sites in the large cytosolic domain are An early gel filtration study of overexpressed rat IP3R1 cyto- 2+ distant from the Ca conducting pore, and the allosteric mecha- solic domain detected an IP3-dependent shift of elution volumes 2+ nism of how IP3 opens the Ca channel remains elusive. Here, we (23), and X-ray crystallography of the IP3-binding domain pro- identify a long-range gating mechanism uncovered by channel vided the first glimpse of IP3-dependent conformational changes mutagenesis and X-ray crystallography of the large cytosolic do- (24). However, the largest IP3R1 fragment solved to date by main of mouse type 1 IP3R in the absence and presence of IP3. X-ray crystallography is limited to the IP3-binding domain in- Analyses of two distinct space group crystals uncovered an IP3- cluding ∼580 residues in IP3R1 (24, 25); thus, the major residual dependent global translocation of the curvature α-helical domain part of the receptor containing more than 1,600 residues in the interfacing with the cytosolic and channel domains.