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Ghosh S, Feagan BG, Ott E, Gasink C, Godwin B, Marano C, Miao Y, Ma T, Loftus EV, Sandborn WJ, Danese S, Abreu MT, Sands BE. Safety of Ustekinumab in Inflammatory Bowel Disease: Pooled Safety Analysis Through 5 Years in Crohn's Disease and 4 Years in Ulcerative Colitis. J Crohns Colitis 2024:jjae013. [PMID: 38310565 DOI: 10.1093/ecco-jcc/jjae013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Indexed: 02/06/2024]
Abstract
BACKGROUND AND AIMS Previously published long-term safety data reported a favorable ustekinumab safety treatment profile for treatment of inflammatory bowel disease (IBD). We present the final cumulative safety data from pooled ustekinumab IBD phase 2/3 clinical studies through 5 years in Crohn's disease (CD) and 4 years in ulcerative colitis (UC). METHODS In phase 3 studies, patients received a single IV placebo or ustekinumab (130mg or ~6mg/kg) induction dose followed by subcutaneous maintenance doses of placebo or ustekinumab (90mg q8w or q12w). Analyses included all patients who received one dose of study treatment and included patients who were biologic-naïve and patients with a history of biologic failure. Safety outcomes are summarized and presented using number of events per 100 patient-years of follow-up and corresponding 95% confidence interval. RESULTS In this final pooled safety analysis, 2575 patients were treated with ustekinumab with 4826 patient-years of follow-up. Rates of key safety events, including MACE and malignancies, were similar between placebo and ustekinumab or not higher for ustekinumab.Opportunistic infections, including tuberculosis, and malignancies were reported infrequently. Rates of key safety events in the IBD group were no higher in the ustekinumab group than in the placebo group for both patients who were biologic naïve or who had previously failed a biologic. No lymphomas or cases of posterior reversible encephalopathy syndrome (PRES; formerly known as reversible posterior leukoencephalopathy syndrome [RPLS] were reported. CONCLUSION The final cumulative ustekinumab safety data through 5 years in CD and 4 years in UC demonstrated favorable safety compared to placebo and continues to support the well-established safety profile across all approved indications.
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Affiliation(s)
- Subrata Ghosh
- APC Microbiome Ireland, College of Medicine and Health, University College Cork, Cork, Ireland
| | - Brian G Feagan
- Western University and Alimentiv Inc., London, ON, Canada
| | - Elyssa Ott
- Formerly of Janssen Scientific Affairs, LLC, Horsham, PA, USA
| | | | - Bridget Godwin
- Formerly of Janssen Scientific Affairs, LLC, Horsham, PA, USA
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - Colleen Marano
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - Ye Miao
- Janssen Research & Development, LLC, Spring House, PA, USA
| | - Tony Ma
- Janssen Scientific Affairs, LLC, Horsham, PA, USA
| | - Edward V Loftus
- Division of Gastroenterology and Hepatology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA
| | - William J Sandborn
- Division of Gastroenterology, University of California San Diego, La Jolla, CA, USA
- Ventyx Biosciences, Inc., Encinitas, CA, USA
| | - Silvio Danese
- IRCCS Ospedale San Raffaele and University Vita-Salute San Raffaele Milano, Italy
| | - Maria T Abreu
- University of Miami Miller School of Medicine, Miami, FL, USA
| | - Bruce E Sands
- Dr. Henry D. Janowitz Division of Gastroenterology, Icahn School of Medicine at Mount Sinai, New York, NY, USA
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Zhdanava M, Kachroo S, Manceur AM, Ding Z, Holiday C, Zhao R, Godwin B, Pilon D. Persistence Among Patients with Crohn Disease Previously Treated with an Anti-tumor Necrosis Factor Inhibitor and Switching or Cycling to Another Biologic Agent. Clin Ther 2023; 45:770-777. [PMID: 37442653 DOI: 10.1016/j.clinthera.2023.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Revised: 06/15/2023] [Accepted: 06/15/2023] [Indexed: 07/15/2023]
Abstract
PURPOSE Nonresponse to an anti-tumor necrosis factor (TNF) agent in patients with Crohn disease (CD) is often managed by either a switch to a different class of biologic (ie, ustekinumab, vedolizumab) or by cycling to another anti-TNF agent (ie, adalimumab, infliximab, certolizumab pegol). Persistence after a switch to a different biologic class or after cycling within the anti-TNF class was assessed in patients with nonresponse to an anti-TNF agent. METHODS Adults with CD who discontinued from an anti-TNF agent and either switched to a different class of biologic (ie, anti-interleukin/integrin; the switching cohort) or cycled within the anti-TNF class (the cycling cohort) between September 23, 2016, and August 1, 2019, were selected from a commercial database. The index date was defined as the date of the first claim of the subsequent-line biologic (index biologic) after an anti-TNF. The switching and cycling cohorts were balanced with regard to baseline characteristics, using inverse probability of treatment weights-average treatment effect (IPTW-ATE). Persistence with the index biologic was defined as consistent use with no gaps of >120 days (ustekinumab, vedolizumab, infliximab) or of >60 days (adalimumab, certolizumab pegol) in biologic supply. Composite end points were persistence while being corticosteroid-free (defined as no use of corticosteroids with ≥14 days of supply after day 90 post-index) and persistence while on monotherapy (no immunomodulators/nonindex biologics). Weighted Kaplan-Meier and Cox models were used to assess outcomes at 12 months post-index. FINDINGS There were 444 patients in the weighted switching cohort (mean age, 40.4 years; 56.3% female) and 441 in the weighted cycling cohort (mean age, 39.5 years; 58.4% female). At 12 months post-index, the rate of persistence with the index biologic was 75.7% in the switching cohort compared to 67.5% in the cycling cohort (log-rank P = 0.023); the rate of persistence while on monotherapy was 58.2% compared to 44.2%, respectively (log-rank P < 0.001). The rate of persistence was 44% greater in the switching compared to that in the cycling cohort (hazard ratio [HR] = 1.44; 95% CI, 1.11-1.88; P = 0.007); the rate of persistence while on monotherapy was 56% greater in the switching cohort (HR = 1.56; 95% CI, 1.28-1.90; P < 0.001). The between-cohort difference in persistence while being corticosteroid-free was not statistically significant (HR = 1.08; 95% CI, 0.89-1.32; P = 0.426). IMPLICATIONS Patients with CD who switched to a different biologic class were more persistent than were patients who cycled to another anti-TNF agent. These findings may be useful for physicians when considering the treatment of patients who have experienced nonresponse or loss of response to the first-line anti-TNF agent.
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Affiliation(s)
| | | | | | - Zhijie Ding
- Janssen Scientific Affairs LLC, Horsham, Pennsylvania
| | | | - Ruizhi Zhao
- Janssen Scientific Affairs LLC, Horsham, Pennsylvania
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Lynch KL, Benitez AJ, Godwin B, Klein J, Savant D, Wilkins BJ, Menard-Katcher C, Gluckman C, Falk GW, Muir A. The Slender Esophagus: Unrecognized Esophageal Narrowing in Eosinophilic Esophagitis. Clin Transl Gastroenterol 2023; 14:e00564. [PMID: 36603149 PMCID: PMC10132706 DOI: 10.14309/ctg.0000000000000564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 12/27/2022] [Indexed: 01/07/2023] Open
Abstract
INTRODUCTION Inflammation in eosinophilic esophagitis (EoE) often leads to esophageal strictures. Evaluating esophageal narrowing is clinically challenging. We evaluated esophageal distensibility as related to disease activity, fibrosis, and dysphagia. METHODS Adult patients with and without EoE underwent endoscopy and distensibility measurements. Histology, distensibility, and symptoms were analyzed. RESULTS Patients with EoE had significantly lower distensibilities than controls. We found a cohort with esophageal diameter under 15 mm despite lack of dysphagia. DISCUSSION This study raises concern that current assessments of fibrostenosis are suboptimal. We describe a cohort with unrecognized slender esophagus that were identified through impedance planimetry measurements. This tool provides additional information beyond symptomatic, histologic, and endoscopic assessments.
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Affiliation(s)
- Kristle L. Lynch
- Division of Gastroenterology and Hepatology, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Alain J. Benitez
- Division of Gastroenterology and Hepatology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Bridget Godwin
- Division of Gastroenterology and Hepatology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Jeremy Klein
- Division of Gastroenterology and Hepatology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Deepika Savant
- Department of Pathology and Laboratory Medicine, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Benjamin J. Wilkins
- Department of Pathology and Laboratory Medicine, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - Calies Menard-Katcher
- Section of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, University of Colorado School of Medicine, Digestive Health Institute, Children's Hospital Colorado, Aurora, Colorado, USA
| | - Craig Gluckman
- Division of Gastroenterology and Hepatology, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Gary W. Falk
- Division of Gastroenterology and Hepatology, The University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
| | - Amanda Muir
- Division of Gastroenterology and Hepatology, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
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Spergel B, Godwin B, Liacouras C, Cianferoni A, Gober L, Hill D, Spergel J, Ruffner M, Brown-Whitehorn T, Muir A. Effect of Dupilumab on Eosinophilic Esophagitis when used for other approved indications. J Allergy Clin Immunol 2022. [DOI: 10.1016/j.jaci.2021.12.664] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Godwin B, Wilkins B, Muir AB. EoE disease monitoring: Where we are and where we are going. Ann Allergy Asthma Immunol 2019; 124:240-247. [PMID: 31830586 DOI: 10.1016/j.anai.2019.12.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Revised: 11/24/2019] [Accepted: 12/02/2019] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To review literature on various methods of monitoring and characterizing eosinophilic esophagitis (EoE) with respect to their validity as well as risk to the patient. DATA SOURCES A literature search was performed using PubMed with keyword combinations of EoE and monitoring as well as various techniques used for monitoring, including but not limited to, symptoms, endoscopy, histology, fluoroscopy, FLIP, noninvasive monitoring, and biomarkers. STUDY SELECTIONS Case-control studies, observational studies, peer-reviewed reviews and guidelines, and systematic reviews were selected, reviewed, and summarized here. RESULTS A wealth of research regarding monitoring of EoE is currently being undertaken and published. Our review highlights those that have been validated and are currently being used, as well as some that show promise for future monitoring and disease characterization. CONCLUSION Eosinophilic esophagitis is a chronic condition that at this time requires upper endoscopy as the gold standard of diagnosis and monitoring. There is a great need in the field for less invasive monitoring tools and better ways to characterize disease to allow for personalization of therapies.
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Affiliation(s)
- Bridget Godwin
- Division of Gastroenterology, Hepatology, and Nutrition, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; Department of Pediatrics, Perlman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Benjamin Wilkins
- Department of Pathology and Laboratory Medicine, Perlman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Amanda B Muir
- Division of Gastroenterology, Hepatology, and Nutrition, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania; Department of Pediatrics, Perlman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania.
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Muir AB, Brown-Whitehorn T, Godwin B, Cianferoni A. Eosinophilic esophagitis: early diagnosis is the key. Clin Exp Gastroenterol 2019; 12:391-399. [PMID: 31616174 PMCID: PMC6699505 DOI: 10.2147/ceg.s175061] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 07/09/2019] [Indexed: 12/16/2022] Open
Abstract
Eosinophilic esophagitis (EoE) is a disorder which affects all ages, from infancy through adulthood. It typically affects atopic individuals (Table 1) and is a chronic allergic disorder, with foods ubiquitous in the diet being the most described trigger of this isolated eosinophilic inflammation of the esophagus in both adults and children. This inflammatory process leads to esophageal symptoms such as dysphagia and feeding intolerance. In this review, we provide a brief overview of the current state of EoE therapy and symptomatology and then try to make the case for early diagnosis and treatment to prevent some of the long-term consequences of esophageal inflammation.
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Affiliation(s)
- Amanda B Muir
- Gastroenterology Division, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | | | - Bridget Godwin
- Gastroenterology Division, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Antonella Cianferoni
- Gastroenterology Division, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
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7
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Godwin B, Liacouras C, Mehta V, Eisenberg J, Agawu A, Brown-Whitehorn T, Ruffner MA, Verma R, Cianferoni A, Spergel JM, Muir AB. A Review of Tertiary Referrals for Management of Pediatric Esophageal Eosinophilia. Front Pediatr 2018; 6:173. [PMID: 29974044 PMCID: PMC6019483 DOI: 10.3389/fped.2018.00173] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 05/29/2018] [Indexed: 01/07/2023] Open
Abstract
Background: Eosinophilic esophagitis is a chronic, immune-mediated disease characterized by symptoms of esophageal dysfunction and ≥15 eosinophils/high-powered field (eos/hpf). Proton pump inhibitor responsive esophageal eosinophilia (1) is an entity of esophageal eosinophilia that responds to PPI therapy and is thought to be clinically and histologically similar to EoE. Current guidelines suggest therapy with PPI prior to endoscopy and use of PPI as first line for esophageal eosinophilia. In order to gain a better understanding of community practice patterns and to try differentiate between these two entities, we sought to evaluate the clinical presentations, treatment and final diagnoses of patients presenting to our institution for second opinions of esophageal eosinophilia. Methods: A search of our electronic medical record yielded a list of patients presenting for a second opinion of esophageal eosinophilia. Charts were reviewed for clinical information. Results: A total of 187 charts were included. Patients ranged from 1-19 years old with 75% being male and 74% being Caucasian. Of the patients who had documentation of their medications at the time of initial endoscopy, 70% were not on any PPI prior to their endoscopy, and 94% were on <2 mg/kg/day. Of the 19 patients who had full response to PPI therapy and were diagnosed with PPI-REE, close to half had previously been treated with diet, steroids, or both. Patients with final diagnosis of EoE had significantly higher eos/hpf on initial endoscopy compared to those with diagnosis of PPI-REE (51.9 ± 30.6 v. 35.8 ± 16.4. p = 0.027), as well as higher likelihood of having IgE-mediated food allergy (79 v. 47%, p = 0.003). Conclusions: Diagnostic and therapeutic algorithms are needed for esophageal eosinophilia to prevent misdiagnosis and unnecessary procedures and therapies.
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Affiliation(s)
- Bridget Godwin
- Division of Gastroenterology, Hepatology and Nutrition, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Chris Liacouras
- Division of Gastroenterology, Hepatology and Nutrition, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Vijay Mehta
- Pediatrics, Cooper Medical School of Rowan University, Camden, NJ, United States
| | - Joshua Eisenberg
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Atu Agawu
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Terri Brown-Whitehorn
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Melanie A Ruffner
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Ritu Verma
- Division of Gastroenterology, Hepatology and Nutrition, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Antonella Cianferoni
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Jonathan M Spergel
- Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Division of Allergy and Immunology, Children's Hospital of Philadelphia, Philadelphia, PA, United States
| | - Amanda B Muir
- Division of Gastroenterology, Hepatology and Nutrition, Children's Hospital of Philadelphia, Philadelphia, PA, United States.,Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA, United States
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Abstract
Food is essential for life. Yet, poor food choices may cause poor health. Dietary manipulation is frequently integrated into the management of common chronic pediatric conditions. Parents seek dietary information to have more control over child's condition and to avoid side effects of medicine. This article reviews selected diets for a few common pediatric disorders including eczema, attention deficit hyperactivity disorder, headache and migraine, non-celiac gluten sensitivity, and irritable bowel syndrome.
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Affiliation(s)
| | - Amanda Hall
- The Children's Hospital of Philadelphia, Philadelphia, PA
| | - Amy Dean
- The Children's Hospital of Philadelphia, Philadelphia, PA
| | - Bridget Godwin
- The Children's Hospital of Philadelphia, Philadelphia, PA
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Giot L, Bader JS, Brouwer C, Chaudhuri A, Kuang B, Li Y, Hao YL, Ooi CE, Godwin B, Vitols E, Vijayadamodar G, Pochart P, Machineni H, Welsh M, Kong Y, Zerhusen B, Malcolm R, Varrone Z, Collis A, Minto M, Burgess S, McDaniel L, Stimpson E, Spriggs F, Williams J, Neurath K, Ioime N, Agee M, Voss E, Furtak K, Renzulli R, Aanensen N, Carrolla S, Bickelhaupt E, Lazovatsky Y, DaSilva A, Zhong J, Stanyon CA, Finley RL, White KP, Braverman M, Jarvie T, Gold S, Leach M, Knight J, Shimkets RA, McKenna MP, Chant J, Rothberg JM. A protein interaction map of Drosophila melanogaster. Science 2003; 302:1727-36. [PMID: 14605208 DOI: 10.1126/science.1090289] [Citation(s) in RCA: 1581] [Impact Index Per Article: 75.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Drosophila melanogaster is a proven model system for many aspects of human biology. Here we present a two-hybrid-based protein-interaction map of the fly proteome. A total of 10,623 predicted transcripts were isolated and screened against standard and normalized complementary DNA libraries to produce a draft map of 7048 proteins and 20,405 interactions. A computational method of rating two-hybrid interaction confidence was developed to refine this draft map to a higher confidence map of 4679 proteins and 4780 interactions. Statistical modeling of the network showed two levels of organization: a short-range organization, presumably corresponding to multiprotein complexes, and a more global organization, presumably corresponding to intercomplex connections. The network recapitulated known pathways, extended pathways, and uncovered previously unknown pathway components. This map serves as a starting point for a systems biology modeling of multicellular organisms, including humans.
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Affiliation(s)
- L Giot
- CuraGen Corporation, 555 Long Wharf Drive, New Haven, CT 06511, USA
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Uetz P, Giot L, Cagney G, Mansfield TA, Judson RS, Knight JR, Lockshon D, Narayan V, Srinivasan M, Pochart P, Qureshi-Emili A, Li Y, Godwin B, Conover D, Kalbfleisch T, Vijayadamodar G, Yang M, Johnston M, Fields S, Rothberg JM. A comprehensive analysis of protein-protein interactions in Saccharomyces cerevisiae. Nature 2000; 403:623-7. [PMID: 10688190 DOI: 10.1038/35001009] [Citation(s) in RCA: 3099] [Impact Index Per Article: 129.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Two large-scale yeast two-hybrid screens were undertaken to identify protein-protein interactions between full-length open reading frames predicted from the Saccharomyces cerevisiae genome sequence. In one approach, we constructed a protein array of about 6,000 yeast transformants, with each transformant expressing one of the open reading frames as a fusion to an activation domain. This array was screened by a simple and automated procedure for 192 yeast proteins, with positive responses identified by their positions in the array. In a second approach, we pooled cells expressing one of about 6,000 activation domain fusions to generate a library. We used a high-throughput screening procedure to screen nearly all of the 6,000 predicted yeast proteins, expressed as Gal4 DNA-binding domain fusion proteins, against the library, and characterized positives by sequence analysis. These approaches resulted in the detection of 957 putative interactions involving 1,004 S. cerevisiae proteins. These data reveal interactions that place functionally unclassified proteins in a biological context, interactions between proteins involved in the same biological function, and interactions that link biological functions together into larger cellular processes. The results of these screens are shown here.
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Affiliation(s)
- P Uetz
- Department of Genetics, University of Washington, Seattle 98195-7360, USA
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Kerbes RH, McLandress MR, Smith GEJ, Beyersbergen GW, Godwin B. Ross' Goose and Lesser Snow Goose colonies in the central Canadian Arctic. CAN J ZOOL 1983. [DOI: 10.1139/z83-021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A total of 133 700 nesting Ross' Geese and Lesser Snow Geese (Anser rossii and Anser c. caerulescens), in 30 colonies, were photographed in the central Canadian Arctic, Queen Maud Gulf, N.W.T., in June 1976. Estimated species totals were 77 300 Ross' Geese and 56 400 Lesser Snow Geese (of which 15% were blue phase). Species totals were calculated from a photographic census of all Ross' Geese and white phase Snow Geese combined with assumptions based on the estimated proportion of blue phase Snow Geese in each of the 10 largest colonies and the estimated proportion of Ross' Geese in the largest colony. Comparison with a previous visual nesting inventory suggested that from 1967 to 1976 Ross' Geese doubled in number while Lesser Snow Geese increased fivefold. Nesting resources do not appear to be limited.
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Godwin B, McCall AJ. Transfusion Compatibility Tests. West J Med 1949. [DOI: 10.1136/bmj.2.4617.33-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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