The Open Neurology Journal, 2016, 10, I-Xv I the Open Neurology Journal Supplementary Material Content List Available At
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Targeted Genes and Methodology Details for Neuromuscular Genetic Panels
Targeted Genes and Methodology Details for Neuromuscular Genetic Panels Reference transcripts based on build GRCh37 (hg19) interrogated by Neuromuscular Genetic Panels Next-generation sequencing (NGS) and/or Sanger sequencing is performed Motor Neuron Disease Panel to test for the presence of a mutation in these genes. Gene GenBank Accession Number Regions of homology, high GC-rich content, and repetitive sequences may ALS2 NM_020919 not provide accurate sequence. Therefore, all reported alterations detected ANG NM_001145 by NGS are confirmed by an independent reference method based on laboratory developed criteria. However, this does not rule out the possibility CHMP2B NM_014043 of a false-negative result in these regions. ERBB4 NM_005235 Sanger sequencing is used to confirm alterations detected by NGS when FIG4 NM_014845 appropriate.(Unpublished Mayo method) FUS NM_004960 HNRNPA1 NM_031157 OPTN NM_021980 PFN1 NM_005022 SETX NM_015046 SIGMAR1 NM_005866 SOD1 NM_000454 SQSTM1 NM_003900 TARDBP NM_007375 UBQLN2 NM_013444 VAPB NM_004738 VCP NM_007126 ©2018 Mayo Foundation for Medical Education and Research Page 1 of 14 MC4091-83rev1018 Muscular Dystrophy Panel Muscular Dystrophy Panel Gene GenBank Accession Number Gene GenBank Accession Number ACTA1 NM_001100 LMNA NM_170707 ANO5 NM_213599 LPIN1 NM_145693 B3GALNT2 NM_152490 MATR3 NM_199189 B4GAT1 NM_006876 MYH2 NM_017534 BAG3 NM_004281 MYH7 NM_000257 BIN1 NM_139343 MYOT NM_006790 BVES NM_007073 NEB NM_004543 CAPN3 NM_000070 PLEC NM_000445 CAV3 NM_033337 POMGNT1 NM_017739 CAVIN1 NM_012232 POMGNT2 -
MLR) Model and Filtration
SUPPLEMENT Contents 1. Extended description of the Data sets. 2. Extended description of the multiple linear regression (MLR) model and filtration. 3. Extended description of the random-gene classifiers. 4. Extended description of the comparison with Dakhova et al. (1)and Richardson et al. (2) 5. Extended description of preparation of RNA and the XP_PCR protocol. 6. Table S1. Comparison of 131-probe set Diagnostic Classifier to classifiers generated with ‘random’ genes. 7. Table S2. Concordance of 38 overlapping genes/probe sets of the 339 probe sets ( basis) of the Diagnostic Classifier with the sign of differential change of Dakhova et al. (1). 8. Table S3. Function enrichment analysis. 9. Table S4. PCR validation of preferential expression in stroma by representative genes of the Diagnostic Classifier. 10. Figure S1. The incidence numbers of 339 probe sets obtained by 105-fold permutation procedure for gene selection. 11. Figure S2. Heatmap using the Diagnostic Classifier to categorize all training cases. 12. Figure S3. Heatmap of all 364 test samples used in this study as categorized by the 131 probe set Diagnostic Classifier. 13. Figure S4. Cluster diagram of the cases of Dakhova et al. (1) using only the 38 overlapping genes. 14. References for the Supplement. 1 1. Extended description of the Data Sets. Datasets 1 and 2 (Table 1) are based on post-prostatectomy frozen tissue samples obtained by informed consent using IRB-approved and HIPPA-compliant protocols. All tissues, except where noted, were collected at surgery and escorted to pathology for expedited review, dissection, and snap freezing in liquid nitrogen. -
Podocyte Specific Knockdown of Klf15 in Podocin-Cre Klf15flox/Flox Mice Was Confirmed
SUPPLEMENTARY FIGURE LEGENDS Supplementary Figure 1: Podocyte specific knockdown of Klf15 in Podocin-Cre Klf15flox/flox mice was confirmed. (A) Primary glomerular epithelial cells (PGECs) were isolated from 12-week old Podocin-Cre Klf15flox/flox and Podocin-Cre Klf15+/+ mice and cultured at 37°C for 1 week. Real-time PCR was performed for Nephrin, Podocin, Synaptopodin, and Wt1 mRNA expression (n=6, ***p<0.001, Mann-Whitney test). (B) Real- time PCR was performed for Klf15 mRNA expression (n=6, *p<0.05, Mann-Whitney test). (C) Protein was also extracted and western blot analysis for Klf15 was performed. The representative blot of three independent experiments is shown in the top panel. The bottom panel shows the quantification of Klf15 by densitometry (n=3, *p<0.05, Mann-Whitney test). (D) Immunofluorescence staining for Klf15 and Wt1 was performed in 12-week old Podocin-Cre Klf15flox/flox and Podocin-Cre Klf15+/+ mice. Representative images from four mice in each group are shown in the left panel (X 20). Arrows show colocalization of Klf15 and Wt1. Arrowheads show a lack of colocalization. Asterisk demonstrates nonspecific Wt1 staining. “R” represents autofluorescence from RBCs. In the right panel, a total of 30 glomeruli were selected in each mouse and quantification of Klf15 staining in the podocytes was determined by the ratio of Klf15+ and Wt1+ cells to Wt1+ cells (n=6 mice, **p<0.01, unpaired t test). Supplementary Figure 2: LPS treated Podocin-Cre Klf15flox/flox mice exhibit a lack of recovery in proteinaceous casts and tubular dilatation after DEX administration. -
Benefits of Exome Sequencing in Children with Suspected Isolated
G C A T T A C G G C A T genes Article Benefits of Exome Sequencing in Children with Suspected Isolated Hearing Loss Roxane Van Heurck 1, Maria Teresa Carminho-Rodrigues 1, Emmanuelle Ranza 1, Caterina Stafuzza 2, Lina Quteineh 1, Corinne Gehrig 1, Eva Hammar 1, Michel Guipponi 1, Marc Abramowicz 1, Pascal Senn 2 , Nils Guinand 2, Helene Cao-Van 2 and Ariane Paoloni-Giacobino 1,* 1 Division of Genetic Medicine, Geneva University Hospitals, 1205 Geneva, Switzerland; [email protected] (R.V.H.); [email protected] (M.T.C.-R.); [email protected] (E.R.); [email protected] (L.Q.); [email protected] (C.G.); [email protected] (E.H.); [email protected] (M.G.); [email protected] (M.A.) 2 Ear-Nose-Throat/Head and Neck Surgery Division, Geneva University Hospitals, 1205 Geneva, Switzerland; [email protected] (C.S.); [email protected] (P.S.); [email protected] (N.G.); [email protected] (H.C.-V.) * Correspondence: [email protected] Abstract: Purpose: Hearing loss is characterized by an extensive genetic heterogeneity and remains a common disorder in children. Molecular diagnosis is of particular benefit in children, and permits the early identification of clinically-unrecognized hearing loss syndromes, which permits effective clinical management and follow-up, including genetic counselling. Methods: We performed whole-exome Citation: Van Heurck, R.; sequencing with the analysis of a panel of 189 genes associated with hearing loss in a prospective Carminho-Rodrigues, M.T.; Ranza, E.; cohort of 61 children and 9 adults presenting mainly with isolated hearing loss. -
Seq2pathway Vignette
seq2pathway Vignette Bin Wang, Xinan Holly Yang, Arjun Kinstlick May 19, 2021 Contents 1 Abstract 1 2 Package Installation 2 3 runseq2pathway 2 4 Two main functions 3 4.1 seq2gene . .3 4.1.1 seq2gene flowchart . .3 4.1.2 runseq2gene inputs/parameters . .5 4.1.3 runseq2gene outputs . .8 4.2 gene2pathway . 10 4.2.1 gene2pathway flowchart . 11 4.2.2 gene2pathway test inputs/parameters . 11 4.2.3 gene2pathway test outputs . 12 5 Examples 13 5.1 ChIP-seq data analysis . 13 5.1.1 Map ChIP-seq enriched peaks to genes using runseq2gene .................... 13 5.1.2 Discover enriched GO terms using gene2pathway_test with gene scores . 15 5.1.3 Discover enriched GO terms using Fisher's Exact test without gene scores . 17 5.1.4 Add description for genes . 20 5.2 RNA-seq data analysis . 20 6 R environment session 23 1 Abstract Seq2pathway is a novel computational tool to analyze functional gene-sets (including signaling pathways) using variable next-generation sequencing data[1]. Integral to this tool are the \seq2gene" and \gene2pathway" components in series that infer a quantitative pathway-level profile for each sample. The seq2gene function assigns phenotype-associated significance of genomic regions to gene-level scores, where the significance could be p-values of SNPs or point mutations, protein-binding affinity, or transcriptional expression level. The seq2gene function has the feasibility to assign non-exon regions to a range of neighboring genes besides the nearest one, thus facilitating the study of functional non-coding elements[2]. Then the gene2pathway summarizes gene-level measurements to pathway-level scores, comparing the quantity of significance for gene members within a pathway with those outside a pathway. -
Dissertationes Medicinae Universitatis Tartuensis 178
DISSERTATIONES MEDICINAE UNIVERSITATIS TARTUENSIS 178 DISSERTATIONES MEDICINAE UNIVERSITATIS TARTUENSIS 178 RITA TEEK The genetic causes of early onset hearing loss in Estonian children Department of Paediatrics, University of Tartu, Tartu, Estonia Dissertation is accepted for commencement of the degree of Doctor of Medical Sciences on September 22, 2010 by the Council of the Faculty of Medicine, University of Tartu, Estonia. Supervisors: Professor Katrin Õunap, MD, PhD, Department of Paediatrics, University of Tartu, Tartu, Estonia The Late Professor Mart Kull, MD, PhD, Department of Oto-Rhino-Laryngology, University of Tartu, Tartu, Estonia (2005–2008) Reviewers: Assistant Professor Gunnar Tasa, MD, PhD, Department of General and Molecular Pathology, University of Tartu, Tartu, Estonia Assistant Professor Oivi Uibo, MD, PhD, Department of Paediatrics, University of Tartu, Tartu, Estonia Opponent: Professor Lisbeth Tranebjærg, MD, PhD, Department of Audiology, H:S Bispebjerg Hospital, and Wilhelm Johannsen Centre of Functional Genomics Institute of Cellular and Molecular Medicine, ICMM, University of Copenhagen, The Panum Institute, Denmark Commencement: November 24, 2010 ISSN 1024–395x ISBN 978–9949–19–478–0 (trükis) ISBN 978–9949–19–479–7 (PDF) Autoriõigus: Rita Teek, 2010 Tartu Ülikooli Kirjastus www.tyk.ee Tellimuse nr. 570 To my patients and their families CONTENTS LIST OF ORIGINAL PUBLICATIONS ...................................................... 9 ABBREVIATIONS OF HEARING LOSS STUDY GROUPS AND PATIENTS .................................................................................................... -
A Computational Approach for Defining a Signature of Β-Cell Golgi Stress in Diabetes Mellitus
Page 1 of 781 Diabetes A Computational Approach for Defining a Signature of β-Cell Golgi Stress in Diabetes Mellitus Robert N. Bone1,6,7, Olufunmilola Oyebamiji2, Sayali Talware2, Sharmila Selvaraj2, Preethi Krishnan3,6, Farooq Syed1,6,7, Huanmei Wu2, Carmella Evans-Molina 1,3,4,5,6,7,8* Departments of 1Pediatrics, 3Medicine, 4Anatomy, Cell Biology & Physiology, 5Biochemistry & Molecular Biology, the 6Center for Diabetes & Metabolic Diseases, and the 7Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, IN 46202; 2Department of BioHealth Informatics, Indiana University-Purdue University Indianapolis, Indianapolis, IN, 46202; 8Roudebush VA Medical Center, Indianapolis, IN 46202. *Corresponding Author(s): Carmella Evans-Molina, MD, PhD ([email protected]) Indiana University School of Medicine, 635 Barnhill Drive, MS 2031A, Indianapolis, IN 46202, Telephone: (317) 274-4145, Fax (317) 274-4107 Running Title: Golgi Stress Response in Diabetes Word Count: 4358 Number of Figures: 6 Keywords: Golgi apparatus stress, Islets, β cell, Type 1 diabetes, Type 2 diabetes 1 Diabetes Publish Ahead of Print, published online August 20, 2020 Diabetes Page 2 of 781 ABSTRACT The Golgi apparatus (GA) is an important site of insulin processing and granule maturation, but whether GA organelle dysfunction and GA stress are present in the diabetic β-cell has not been tested. We utilized an informatics-based approach to develop a transcriptional signature of β-cell GA stress using existing RNA sequencing and microarray datasets generated using human islets from donors with diabetes and islets where type 1(T1D) and type 2 diabetes (T2D) had been modeled ex vivo. To narrow our results to GA-specific genes, we applied a filter set of 1,030 genes accepted as GA associated. -
Related Malignant Phenotypes in the Nf1-Deficient MPNST
Published OnlineFirst February 19, 2013; DOI: 10.1158/1541-7786.MCR-12-0593 Molecular Cancer Genomics Research RAS/MEK–Independent Gene Expression Reveals BMP2- Related Malignant Phenotypes in the Nf1-Deficient MPNST Daochun Sun1, Ramsi Haddad2,3, Janice M. Kraniak2, Steven D. Horne1, and Michael A. Tainsky1,2 Abstract Malignant peripheral nerve sheath tumor (MPNST) is a type of soft tissue sarcoma that occurs in carriers of germline mutations in Nf1 gene as well as sporadically. Neurofibromin, encoded by the Nf1 gene, functions as a GTPase-activating protein (GAP) whose mutation leads to activation of wt-RAS and mitogen-activated protein kinase (MAPK) signaling in neurofibromatosis type I (NF1) patients' tumors. However, therapeutic targeting of RAS and MAPK have had limited success in this disease. In this study, we modulated NRAS, mitogen-activated protein/extracellular signal–regulated kinase (MEK)1/2, and neurofibromin levels in MPNST cells and determined gene expression changes to evaluate the regulation of signaling pathways in MPNST cells. Gene expression changes due to neurofibromin modulation but independent of NRAS and MEK1/2 regulation in MPNST cells indicated bone morphogenetic protein 2 (Bmp2) signaling as a key pathway. The BMP2-SMAD1/5/8 pathway was activated in NF1-associated MPNST cells and inhibition of BMP2 signaling by LDN-193189 or short hairpin RNA (shRNA) to BMP2 decreased the motility and invasion of NF1-associated MPNST cells. The pathway-specific gene changes provide a greater understanding of the complex role of neurofibromin in MPNST pathology and novel targets for drug discovery. Mol Cancer Res; 11(6); 616–27. -
Conserved and Novel Properties of Clathrin-Mediated Endocytosis in Dictyostelium Discoideum" (2012)
Rockefeller University Digital Commons @ RU Student Theses and Dissertations 2012 Conserved and Novel Properties of Clathrin- Mediated Endocytosis in Dictyostelium Discoideum Laura Macro Follow this and additional works at: http://digitalcommons.rockefeller.edu/ student_theses_and_dissertations Part of the Life Sciences Commons Recommended Citation Macro, Laura, "Conserved and Novel Properties of Clathrin-Mediated Endocytosis in Dictyostelium Discoideum" (2012). Student Theses and Dissertations. Paper 163. This Thesis is brought to you for free and open access by Digital Commons @ RU. It has been accepted for inclusion in Student Theses and Dissertations by an authorized administrator of Digital Commons @ RU. For more information, please contact [email protected]. CONSERVED AND NOVEL PROPERTIES OF CLATHRIN- MEDIATED ENDOCYTOSIS IN DICTYOSTELIUM DISCOIDEUM A Thesis Presented to the Faculty of The Rockefeller University in Partial Fulfillment of the Requirements for the degree of Doctor of Philosophy by Laura Macro June 2012 © Copyright by Laura Macro 2012 CONSERVED AND NOVEL PROPERTIES OF CLATHRIN- MEDIATED ENDOCYTOSIS IN DICTYOSTELIUM DISCOIDEUM Laura Macro, Ph.D. The Rockefeller University 2012 The protein clathrin mediates one of the major pathways of endocytosis from the extracellular milieu and plasma membrane. Clathrin functions with a network of interacting accessory proteins, one of which is the adaptor complex AP-2, to co-ordinate vesicle formation. Disruption of genes involved in clathrin-mediated endocytosis causes embryonic lethality in multicellular animals suggesting that clathrin-mediated endocytosis is a fundamental cellular process. However, loss of clathrin-mediated endocytosis genes in single cell eukaryotes, such as S.cerevisiae (yeast), does not cause lethality, suggesting that clathrin may convey specific advantages for multicellularity. -
My Beloved Neutrophil Dr Boxer 2014 Neutropenia Family Conference
The Beloved Neutrophil: Its Function in Health and Disease Stem Cell Multipotent Progenitor Myeloid Lymphoid CMP IL-3, SCF, GM-CSF CLP Committed Progenitor MEP GMP GM-CSF, IL-3, SCF EPO TPO G-CSF M-CSF IL-5 IL-3 SCF RBC Platelet Neutrophil Monocyte/ Basophil B-cells Macrophage Eosinophil T-Cells Mast cell NK cells Mature Cell Dendritic cells PRODUCTION AND KINETICS OF NEUTROPHILS CELLS % CELLS TIME Bone Marrow: Myeloblast 1 7 - 9 Mitotic Promyelocyte 4 Days Myelocyte 16 Maturation/ Metamyelocyte 22 3 – 7 Storage Band 30 Days Seg 21 Vascular: Peripheral Blood Seg 2 6 – 12 hours 3 Marginating Pool Apoptosis and ? Tissue clearance by 0 – 3 macrophages days PHAGOCYTOSIS 1. Mobilization 2. Chemotaxis 3. Recognition (Opsonization) 4. Ingestion 5. Degranulation 6. Peroxidation 7. Killing and Digestion 8. Net formation Adhesion: β 2 Integrins ▪ Heterodimer of a and b chain ▪ Tight adhesion, migration, ingestion, co- stimulation of other PMN responses LFA-1 Mac-1 (CR3) p150,95 a2b2 a CD11a CD11b CD11c CD11d b CD18 CD18 CD18 CD18 Cells All PMN, Dendritic Mac, mono, leukocytes mono/mac, PMN, T cell LGL Ligands ICAMs ICAM-1 C3bi, ICAM-3, C3bi other other Fibrinogen other GRANULOCYTE CHEMOATTRACTANTS Chemoattractants Source Activators Lipids PAF Neutrophils C5a, LPS, FMLP Endothelium LTB4 Neutrophils FMLP, C5a, LPS Chemokines (a) IL-8 Monocytes, endothelium LPS, IL-1, TNF, IL-3 other cells Gro a, b, g Monocytes, endothelium IL-1, TNF other cells NAP-2 Activated platelets Platelet activation Others FMLP Bacteria C5a Activation of complement Other Important Receptors on PMNs ñ Pattern recognition receptors – Detect microbes - Toll receptor family - Mannose receptor - bGlucan receptor – fungal cell walls ñ Cytokine receptors – enhance PMN function - G-CSF, GM-CSF - TNF Receptor ñ Opsonin receptors – trigger phagocytosis - FcgRI, II, III - Complement receptors – ñ Mac1/CR3 (CD11b/CD18) – C3bi ñ CR-1 – C3b, C4b, C3bi, C1q, Mannose binding protein From JG Hirsch, J Exp Med 116:827, 1962, with permission. -
Supplemental Data
MOLECULAR PHARMACOLOGY Supplemental Data Regulation of M3 Muscarinic Receptor Expression and Function by Transmembrane Protein 147 Erica Rosemond, Mario Rossi, Sara M. McMillin, Marco Scarselli, Julie G. Donaldson, and Jürgen Wess Supplemental Table 1 M3R-interacting proteins identified in a membrane-based yeast two-hybrid screen Accession Protein No. Tetraspanin family CD82 AAB23825 CD9 P21926 CD63 AAV38940 Ubiquitin-associated proteins Small ubiquitin-related modifier 2 precursor (SUMO-1) AAC50996 Small ubiquitin-related modifier 2 precursor (SUMO-2) P61956 UBC protein AAH08955 Ubiquitin C NP_066289 Receptor proteins/Transmembrane proteins AAH01118 / Transmembrane protein 147 BC001118 G protein-coupled receptor 37 NP_005293 NM_016235 / Homo sapiens G protein-coupled receptor, family C, group 5, member B (GPRC5B) AAF05331 Rhodopsin NP_000530 Aquaporin-4 (AQP-4) P55087 Glutamate receptor, ionotropic, N-methyl D-aspartate-associated protein 1 NP_001009184 Sodium channel, voltage gated, type VIII, alpha NP_055006 Transmembrane 9 superfamily member 2 CAH71381 Transmembrane protein 14A AAH19328 Signaling molecules Phosphatidic acid phosphatase type 2C AAP35667 Calmodulin 2 AAH08437 Protein kinase Njmu-R1 AAH54035 2',3'-Cyclic nucleotide 3' phosphodiesterase (CNP) AAH06392 Solute carrier proteins Solute carrier family 39 (zinc transporter), member 3 isoform a NP_653165 Solute carrier family 22 (organic cation transporter), member 17 isoform b NP_057693 Solute carrier family 31 (copper transporters), member 2 NP_001851 Solute carrier family -
NICU Gene List Generator.Xlsx
Neonatal Crisis Sequencing Panel Gene List Genes: A2ML1 - B3GLCT A2ML1 ADAMTS9 ALG1 ARHGEF15 AAAS ADAMTSL2 ALG11 ARHGEF9 AARS1 ADAR ALG12 ARID1A AARS2 ADARB1 ALG13 ARID1B ABAT ADCY6 ALG14 ARID2 ABCA12 ADD3 ALG2 ARL13B ABCA3 ADGRG1 ALG3 ARL6 ABCA4 ADGRV1 ALG6 ARMC9 ABCB11 ADK ALG8 ARPC1B ABCB4 ADNP ALG9 ARSA ABCC6 ADPRS ALK ARSL ABCC8 ADSL ALMS1 ARX ABCC9 AEBP1 ALOX12B ASAH1 ABCD1 AFF3 ALOXE3 ASCC1 ABCD3 AFF4 ALPK3 ASH1L ABCD4 AFG3L2 ALPL ASL ABHD5 AGA ALS2 ASNS ACAD8 AGK ALX3 ASPA ACAD9 AGL ALX4 ASPM ACADM AGPS AMELX ASS1 ACADS AGRN AMER1 ASXL1 ACADSB AGT AMH ASXL3 ACADVL AGTPBP1 AMHR2 ATAD1 ACAN AGTR1 AMN ATL1 ACAT1 AGXT AMPD2 ATM ACE AHCY AMT ATP1A1 ACO2 AHDC1 ANK1 ATP1A2 ACOX1 AHI1 ANK2 ATP1A3 ACP5 AIFM1 ANKH ATP2A1 ACSF3 AIMP1 ANKLE2 ATP5F1A ACTA1 AIMP2 ANKRD11 ATP5F1D ACTA2 AIRE ANKRD26 ATP5F1E ACTB AKAP9 ANTXR2 ATP6V0A2 ACTC1 AKR1D1 AP1S2 ATP6V1B1 ACTG1 AKT2 AP2S1 ATP7A ACTG2 AKT3 AP3B1 ATP8A2 ACTL6B ALAS2 AP3B2 ATP8B1 ACTN1 ALB AP4B1 ATPAF2 ACTN2 ALDH18A1 AP4M1 ATR ACTN4 ALDH1A3 AP4S1 ATRX ACVR1 ALDH3A2 APC AUH ACVRL1 ALDH4A1 APTX AVPR2 ACY1 ALDH5A1 AR B3GALNT2 ADA ALDH6A1 ARFGEF2 B3GALT6 ADAMTS13 ALDH7A1 ARG1 B3GAT3 ADAMTS2 ALDOB ARHGAP31 B3GLCT Updated: 03/15/2021; v.3.6 1 Neonatal Crisis Sequencing Panel Gene List Genes: B4GALT1 - COL11A2 B4GALT1 C1QBP CD3G CHKB B4GALT7 C3 CD40LG CHMP1A B4GAT1 CA2 CD59 CHRNA1 B9D1 CA5A CD70 CHRNB1 B9D2 CACNA1A CD96 CHRND BAAT CACNA1C CDAN1 CHRNE BBIP1 CACNA1D CDC42 CHRNG BBS1 CACNA1E CDH1 CHST14 BBS10 CACNA1F CDH2 CHST3 BBS12 CACNA1G CDK10 CHUK BBS2 CACNA2D2 CDK13 CILK1 BBS4 CACNB2 CDK5RAP2