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Pierpont EI, Bennett AM, Schoyer L, Stronach B, Anschutz A, Borrie SC, Briggs B, Burkitt-Wright E, Castel P, Cirstea IC, Draaisma F, Ellis M, Fear VS, Frone MN, Flex E, Gelb BD, Green T, Gripp KW, Khoshkhoo S, Kieran MW, Kleemann K, Klein-Tasman BP, Kontaridis MI, Kruszka P, Leoni C, Liu CZ, Merchant N, Magoulas PL, Moertel C, Prada CE, Rauen KA, Roelofs R, Rossignol R, Sevilla C, Sevilla G, Sheedy R, Stieglitz E, Sun D, Tiemens D, White F, Wingbermühle E, Wolf C, Zenker M, Andelfinger G. The 8th International RASopathies Symposium: Expanding research and care practice through global collaboration and advocacy. Am J Med Genet A 2024; 194:e63477. [PMID: 37969032 PMCID: PMC10939912 DOI: 10.1002/ajmg.a.63477] [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] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 11/04/2023] [Indexed: 11/17/2023]
Abstract
Germline pathogenic variants in the RAS/mitogen-activated protein kinase (MAPK) signaling pathway are the molecular cause of RASopathies, a group of clinically overlapping genetic syndromes. RASopathies constitute a wide clinical spectrum characterized by distinct facial features, short stature, predisposition to cancer, and variable anomalies in nearly all the major body systems. With increasing global recognition of these conditions, the 8th International RASopathies Symposium spotlighted global perspectives on clinical care and research, including strategies for building international collaborations and developing diverse patient cohorts in anticipation of interventional trials. This biannual meeting, organized by RASopathies Network, was held in a hybrid virtual/in-person format. The agenda featured emerging discoveries and case findings as well as progress in preclinical and therapeutic pipelines. Stakeholders including basic scientists, clinician-scientists, practitioners, industry representatives, patients, and family advocates gathered to discuss cutting edge science, recognize current gaps in knowledge, and hear from people with RASopathies about the experience of daily living. Presentations by RASopathy self-advocates and early-stage investigators were featured throughout the program to encourage a sustainable, diverse, long-term research and advocacy partnership focused on improving health and bringing treatments to people with RASopathies.
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Affiliation(s)
| | | | | | | | | | - Sarah C Borrie
- KU Leuven, Laboratory for the Research of Neurodegenerative Diseases
| | - Benjamin Briggs
- School of Medicine, Uniformed Services University of the Health Sciences
| | - Emma Burkitt-Wright
- Manchester Centre for Genomic Medicine, Manchester University NHS Foundation Trust and University of Manchester, Manchester, UK
| | - Pau Castel
- Department of Biochemistry & Molecular Pharmacology, NYU Grossman School of Medicine
| | - Ion C Cirstea
- Institute of Comparative Molecular Endocrinology, Ulm University
- Institute of Applied Physiology, Ulm University
| | - Fieke Draaisma
- Department of Pediatrics, Radboud Institute for Health Sciences, Radboud University Medical Center, Amalia Children’s Hospital
| | | | - Vanessa S. Fear
- Translational Genetics, Precision Health, Telethon Kids Institute, The University of Western Australia
| | - Megan N. Frone
- Clinical Genetics Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH
| | - Elisabetta Flex
- Department of Oncology and Molecular Medicine, Instituo Superiore di Sanità
| | - Bruce D. Gelb
- Mindich Child Health and Development Institute and the Departments of Pediatrics and Genetics and Genomic Sciences, Icahn School of Medicine
| | - Tamar Green
- Division of Interdisciplinary Brain Sciences, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine
| | - Karen W. Gripp
- Division of Medical Genetics, Department of Pediatrics, Nemours Children’s Hospital
| | - Sattar Khoshkhoo
- Department of Neurology, Brigham and Women’s Hospital, Harvard Medical School
| | | | - Karolin Kleemann
- Clinic for Cardiothoracic and Vascular Surgery, University Medical Center Göttingen
- German Center for Cardiovascular Research (DZHK), partner site Göttingen
| | | | - Maria I Kontaridis
- Department of Biomedical Research and Translational Medicine, Masonic Medical Research Institute, Utica, New York, USA
- Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, Massachusetts, USA
| | | | - Chiara Leoni
- Center for Rare Diseases and Birth Defects, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario A.Gemelli, IRCCS, Rome, Italy
| | - Clifford Z. Liu
- Mindich Child Health and Development Institute and the Departments of Pediatrics and Genetics and Genomic Sciences, Icahn School of Medicine
| | | | - Pilar L. Magoulas
- Department of Molecular and Human Genetics, Baylor College of Medicine and Texas Children’s Hospital
| | | | - Carlos E. Prada
- Division of Genetics, Genomics, and Metabolism, Ann and Robert H. Lurie Children’s Hospital of Chicago
- Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Katherine A. Rauen
- Department of Pediatrics, Division of Genomic Medicine, University of California Davis
| | - Renée Roelofs
- Centre of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray, The Netherlands
| | | | | | | | | | - Elliot Stieglitz
- Department of Pediatrics, Benioff Children’s Hospital, University of California
| | - Daochun Sun
- Cancer Biology & Genetics Program, Memorial Sloan Kettering Cancer Center
| | - Dagmar Tiemens
- Department of Pediatrics, Radboud Institute for Health Sciences, Radboud University Medical Center, Amalia Children’s Hospital
| | - Forest White
- Department of Biological Engineering, Massachusetts Institute of Technology
| | - Ellen Wingbermühle
- Centre of Excellence for Neuropsychiatry, Vincent van Gogh Institute for Psychiatry, Venray, The Netherlands
| | - Cordula Wolf
- Department of Pediatric Cardiology and Congenital Heart Disease, German Heart Center Munich, Technical University Munich
| | - Martin Zenker
- Institute of Human Genetics, University Hospital Magdeburg
| | - Gregor Andelfinger
- Department of Anatomy and Cell Biology, McGill School of Biomedical Sciences
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Millenaar FF, Roelofs R, Gonzàlez-Meler MA, Siedow JN, Wagner AM, Lambers H. The alternative oxidase in roots of poa annua after transfer from high-light to low-light conditions. Plant J 2000; 23:623-632. [PMID: 10972888 DOI: 10.1046/j.1365-313x.2000.00832.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The activity of the alternative pathway can be affected by a number of factors, including the amount and reduction state of the alternative oxidase protein, and the reduction state of the ubiquinone pool. To investigate the importance of these factors in vivo, we manipulated the rate of root respiration by transferring the annual grass Poa annua L. from high-light to low-light conditions, and at the same time from long-day to short-day conditions for four days. As a result of the low-light treatment, the total respiration rate of the roots decreased by 45%, in vitro cytochrome c oxidase capacity decreased by 49%, sugar concentration decreased by 90% and the ubiquinone concentration increased by 31%, relative to control values. The absolute rate of oxygen uptake via the alternative pathway, as determined using the 18O-isotope fractionation technique, did not change. Conversely, the cytochrome pathway activity decreased during the low-light treatment; its activity increased upon addition of exogenous sugars to the roots. Interestingly, no change was observed in the concentration of the alternative oxidase protein or in the reduction state of the protein. Also, there was no change in the reduction state of the ubiquinone pool. In conclusion, the concentration and activity of the alternative oxidase were not changed, even under severe light deprivation.
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Affiliation(s)
- F F Millenaar
- Plant Ecophysiology, Utrecht University, Sorbonnelaan 16, 3508 TB Utrecht, The Netherlands.
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Day JW, Roelofs R, Leroy B, Pech I, Benzow K, Ranum LP. Clinical and genetic characteristics of a five-generation family with a novel form of myotonic dystrophy (DM2). Neuromuscul Disord 1999; 9:19-27. [PMID: 10063831 DOI: 10.1016/s0960-8966(98)00094-7] [Citation(s) in RCA: 91] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We report the clinical and genetic characteristics of a five-generation family (MN1) with an unusual form of myotonic dystrophy (DM). Affected individuals have clinical features that are similar to DM including myotonia, distal weakness, frontal balding, polychromatic cataracts, infertility and cardiac arrhythmias. Genetic analyses reveal that affected individuals do not have the CTG expansion associated with DM, nor is the disease locus linked to the DM region of chromosome 19. We have also excluded the MN1 disease locus from the chromosomal regions containing the genes for the muscle sodium (alpha- and beta-subunits) and chloride channels, both of which are involved in other myotonic disorders. We have recently mapped the disease locus (DM2) in this family to a 10 cM region of chromosome 3q [Ranum LPW, Rasmussen PF, Benzow KA, Koob MD, Day JW. Nat Genet 1998;19:196-198]. The genetically distinct form of myotonic dystrophy in the MN1 kindred shares some of the clinical features of previously reported families with proximal myotonic myopathy (PROMM). The size of the MN1 family (25 affected individuals) makes it a unique resource for both clinical and genetic studies. This second form of myotonic dystrophy may help resolve the confusion that remains about how the CTG repeat expansion in the 3' untranslated portion of the myotonin protein kinase gene causes the multisystem involvement of DM.
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Affiliation(s)
- J W Day
- Department of Neurology, University of Minnesota, Minneapolis 55455-0323, USA.
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Park JH, Hill EJ, Chou TH, LeQuire V, Roelofs R, Park CR. Mechanism of action of penicillamine in the treatment of avian muscular dystrophy. Ann N Y Acad Sci 1979; 317:356-69. [PMID: 289317 DOI: 10.1111/j.1749-6632.1979.tb56548.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Penicillamine, a cysteine analog with a reduced sulfhydryl group, has been used in this laboratory for the treatment of hereditary avian dystrophy. The drug delays the onset of symptoms and alleviates the debilitating aspects of the disease. To study the mechanism of drug action, the effects of penicillamine on white and red muscles of dystrophic chickens were examined with regard to the specific activities of the soluble enzymes glyceraldehyde-3-phosphate dehydrogenase, acetylphosphatase, glucose-6-phosphate dehydrogenase, 6-phosphogluconate dehydrogenase, glutathione reductase, glutathione preoxidase, superoxide dismutase, and catalase. The sulfhydryl contents of the soluble proteins and the concentration of myoglobin were also determined. In white dystrophic muscle (pectoral), there were large alterations in the various enzymatic activities compared to normal levels. In the DISCUSSION, these changes are related to the pathogenesis of the disease and to the adaptive response for protection of the severely affected fast fibers. Red dystrophic muscles (thigh) were minimally involved, in accordance with the known sparing action of the slow fiber type. The results suggested that the disease process in dystrophic muscle may be due to oxidation of the essential sulfhydryl groups of proteins. Penicillamine may produce therapeutic effects by altering the intracellular redox status, thereby promoting better regulation of enzymatic activity, membrane stability, and improved muscle function.
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Chou T, Hill EJ, Bartle E, Woolley K, LeQuire V, Olson W, Roelofs R, Park JH. Beneficial effects of penicillamine treatment on hereditary avian muscular dystrophy. J Clin Invest 1975; 56:842-9. [PMID: 1159090 PMCID: PMC301939 DOI: 10.1172/jci108163] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Hereditary muscular dystrophy in chickens of the New Hampshire strain was treated with penicillamine from the 9th day after hatching to the 425th day. The adult maintenance dose for males was 50 mg/kg per day and for females, 13-65 mg/kg per day. In avian dystrophy, deterioration of the muscle fibers is evidenced in the 2nd mo by an inability of the birds to rise after falling on their backs and by a progressive rigidity of the wings. The drug delayed the onset of symptoms and partially alleviated the debilitating aspects of the disease. Penicillamine produced three major improvements: (a) better righting ability when birds were placed on their backs; (b) greater wing flexibility; (c) and suppression of plasma creatine phosphokinase activity. The results are statistically analyzed and discussed in relationship to Duchenne dystrophy. Normal birds were not affected by penicillamine as judged by these parameters. The rationale for using penicillamine, a sulfhydryl compound with reducing properties, was (a) to attempt to protect essential thiol enzymes in the anabolic and glycolytic pathways against inactivation and (b) to prevent collagen cross-linking and deposition in muscle. Although the precise mechanism of drug action has not been determined. the possible role of penicillamine in mitigating the symptoms of genetic dystrophy in man is under consideration. Further, penicillamine may have a more generalized application i the prevention of contractures in a variety of neuromuscular disorders.
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