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Pinelli M, Makdissi S, Scur M, Parsons BD, Baker K, Otley A, MacIntyre B, Nguyen HD, Kim PK, Stadnyk AW, Di Cara F. Peroxisomal cholesterol metabolism regulates yap-signaling, which maintains intestinal epithelial barrier function and is altered in Crohn's disease. Cell Death Dis 2024; 15:536. [PMID: 39069546 DOI: 10.1038/s41419-024-06925-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 07/08/2024] [Accepted: 07/18/2024] [Indexed: 07/30/2024]
Abstract
Intestinal epithelial cells line the luminal surface to establish the intestinal barrier, where the cells play essential roles in the digestion of food, absorption of nutrients and water, protection from microbial infections, and maintaining symbiotic interactions with the commensal microbial populations. Maintaining and coordinating all these functions requires tight regulatory signaling, which is essential for intestinal homeostasis and organismal health. Dysfunction of intestinal epithelial cells, indeed, is linked to gastrointestinal disorders such as irritable bowel syndrome, inflammatory bowel disease, and gluten-related enteropathies. Emerging evidence suggests that peroxisome metabolic functions are crucial in maintaining intestinal epithelial cell functions and intestinal epithelium regeneration and, therefore, homeostasis. Here, we investigated the molecular mechanisms by which peroxisome metabolism impacts enteric health using the fruit fly Drosophila melanogaster and murine model organisms and clinical samples. We show that peroxisomes control cellular cholesterol, which in turn regulates the conserved yes-associated protein-signaling and contributes to intestinal epithelial structure and epithelial barrier function. Moreover, analysis of intestinal organoid cultures derived from biopsies of patients affected by Crohn's Disease revealed that the dysregulation of peroxisome number, excessive cellular cholesterol, and inhibition of Yap-signaling are markers of disease and could be novel diagnostic and/or therapeutic targets for treating Crohn's Disease. Our studies provided mechanistic insights on peroxisomal signaling in intestinal epithelial cell functions and identified cholesterol as a novel metabolic regulator of yes-associated protein-signaling in tissue homeostasis.
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Affiliation(s)
- Marinella Pinelli
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
| | - Stephanie Makdissi
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
| | - Michal Scur
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Brendon D Parsons
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Kristi Baker
- Department of Oncology, University of Alberta, Edmonton, AB, Canada
| | - Anthony Otley
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
| | - Brad MacIntyre
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
| | - Huong D Nguyen
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Peter K Kim
- The Hospital for Sick Children, Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Andrew W Stadnyk
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Francesca Di Cara
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada.
- Department of Pediatrics, Dalhousie University, Izaak Walton Killam (IWK) Health Centre, Halifax, NS, Canada.
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2
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Karuntu JS, Klouwer FCC, Engelen M, Boon CJF. Systematic study of ophthalmological findings in 10 patients with PEX1-mediated Zellweger spectrum disorder. Ophthalmic Genet 2024:1-12. [PMID: 38664000 DOI: 10.1080/13816810.2024.2330389] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Accepted: 03/09/2024] [Indexed: 05/30/2024]
Abstract
PURPOSE This cross-sectional study describes the ophthalmological and general phenotype of 10 patients from six different families with a comparatively mild form of Zellweger spectrum disorder (ZSD), a rare peroxisomal disorder. METHODS Ophthalmological assessment included best-corrected visual acuity (BCVA), perimetry, microperimetry, ophthalmoscopy, fundus photography, spectral-domain optical coherence tomography (SD-OCT), and fundus autofluorescence (FAF) imaging. Medical records were reviewed for medical history and systemic manifestations of ZSD. RESULTS Nine patients were homozygous for c.2528 G > A (p.Gly843Asp) variants in PEX1 and one patient was compound heterozygous for c.2528 G>A (p.Gly843Asp) and c.2097_2098insT (p.Ile700TyrfsTer42) in PEX1. Median age was 22.6 years (interquartile range (IQR): 15.9 - 29.9 years) at the most recent examination, with a median symptom duration of 22.1 years. Symptom onset was variable with presentations of hearing loss (n = 7) or nyctalopia/reduced visual acuity (n = 3) at a median age of 6 months (IQR: 1.9-8.3 months). BCVA (median of 0.8 logMAR; IQR: 0.6-0.9 logMAR) remained stable over 10.8 years and all patients were hyperopic. Fundus examination revealed a variable retinitis pigmentosa (RP)-like phenotype with rounded hyperpigmentations as most prominent feature in six out of nine patients. Electroretinography, visual field measurements, and microperimetry further established the RP-like phenotype. Multimodal imaging revealed significant intraretinal fluid cavities on SD-OCT and a remarkable pattern of hyperautofluorescent abnormalities on FAF in all patients. CONCLUSION This study highlights the ophthalmological phenotype resembling RP with moderate to severe visual impairment in patients with mild ZSD. These findings can aid ophthalmologists in diagnosing, counselling, and managing patients with mild ZSD.
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Affiliation(s)
- Jessica S Karuntu
- Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands
| | - Femke C C Klouwer
- Department of Paediatric Neurology/Emma Children's Hospital, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Marc Engelen
- Department of Paediatric Neurology/Emma Children's Hospital, Amsterdam University Medical Centers, Amsterdam, The Netherlands
| | - Camiel J F Boon
- Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Ophthalmology, Amsterdam University Medical Centers, Amsterdam, The Netherlands
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3
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Gano D, Pardo AC, Glenn OA, Sherr E. Diverse childhood neurologic disorders and outcomes following fetal neurologic consultation. Semin Fetal Neonatal Med 2024:101524. [PMID: 38609800 DOI: 10.1016/j.siny.2024.101524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2024]
Abstract
Fetal neurology encompasses the full spectrum of neonatal and child neurology presentations, with complex additional layers of diagnostic and prognostic challenges unique to the specific prenatal consultation. Diverse genetic and acquired etiologies with a range of potential outcomes may be encountered. Three clinical case presentations are discussed that highlight how postnatal phenotyping and longitudinal follow-up are essential to address the uncertainties that arise in utero, after birth, and in childhood, as well as to provide continuity of care.
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Affiliation(s)
- Dawn Gano
- Departments of Neurology & Pediatrics, UCSF School of Medicine, University of California, San Francisco, San Francisco, CA, USA.
| | - Andrea C Pardo
- Department of Pediatrics, Northwestern Feinberg School of Medicine, Northwestern University, Chicago, IL, USA; Division of Neurology, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, IL, USA
| | - Orit A Glenn
- Department of Radiology & Biomedical Imaging, UCSF School of Medicine, University of California, San Francisco, San Francisco, CA, USA
| | - Elliott Sherr
- Departments of Neurology & Pediatrics, UCSF School of Medicine, University of California, San Francisco, San Francisco, CA, USA
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4
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Parsons BD, Medina-Luna D, Scur M, Pinelli M, Gamage GS, Chilvers RA, Hamon Y, Ahmed IHI, Savary S, Makrigiannis AP, Braverman NE, Rodriguez-Alcazar JF, Latz E, Karakach TK, Di Cara F. Peroxisome deficiency underlies failures in hepatic immune cell development and antigen presentation in a severe Zellweger disease model. Cell Rep 2024; 43:113744. [PMID: 38329874 DOI: 10.1016/j.celrep.2024.113744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/21/2023] [Accepted: 01/18/2024] [Indexed: 02/10/2024] Open
Abstract
Peroxisome biogenesis disorders (PBDs) represent a group of metabolic conditions that cause severe developmental defects. Peroxisomes are essential metabolic organelles, present in virtually every eukaryotic cell and mediating key processes in immunometabolism. To date, the full spectrum of PBDs remains to be identified, and the impact PBDs have on immune function is unexplored. This study presents a characterization of the hepatic immune compartment of a neonatal PBD mouse model at single-cell resolution to establish the importance and function of peroxisomes in developmental hematopoiesis. We report that hematopoietic defects are a feature in a severe PBD murine model. Finally, we identify a role for peroxisomes in the regulation of the major histocompatibility class II expression and antigen presentation to CD4+ T cells in dendritic cells. This study adds to our understanding of the mechanisms of PBDs and expands our knowledge of the role of peroxisomes in immunometabolism.
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Affiliation(s)
- Brendon D Parsons
- University of Alberta, Department of Laboratory Medicine and Pathology, Edmonton, AB T6G 1C9, Canada
| | - Daniel Medina-Luna
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada
| | - Michal Scur
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada
| | - Marinella Pinelli
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada
| | - Gayani S Gamage
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada
| | - Rebecca A Chilvers
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada
| | - Yannick Hamon
- Aix Marseille University, CNRS, INSERM au Centre d'Immunologie de Marseille Luminy, 13288 Marseille, France
| | - Ibrahim H I Ahmed
- Dalhousie University, Department of Pharmacology, Halifax, NS B3H 4R2, Canada; Beatrice Hunter Cancer Research Institute, Halifax, NS, Canada
| | - Stéphane Savary
- University of Bourgogne, Laboratoire Bio-PeroxIL EA7270, Dijon, France
| | - Andrew P Makrigiannis
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada; Beatrice Hunter Cancer Research Institute, Halifax, NS, Canada
| | - Nancy E Braverman
- Research Institute of the McGill University Children's Hospital, Montreal, QC H4A 3J1, Canada
| | | | - Eicke Latz
- University of Bonn, Institute of Innate Immunity, Medical Faculty, 53127 Bonn, Germany
| | - Tobias K Karakach
- Dalhousie University, Department of Pharmacology, Halifax, NS B3H 4R2, Canada; Beatrice Hunter Cancer Research Institute, Halifax, NS, Canada
| | - Francesca Di Cara
- University of Alberta, Department of Laboratory Medicine and Pathology, Edmonton, AB T6G 1C9, Canada; Beatrice Hunter Cancer Research Institute, Halifax, NS, Canada.
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Perez CM, Gong Z, Yoo C, Roy D, Deoraj A, Felty Q. Inhibitor of DNA Binding Protein 3 (ID3) and Nuclear Respiratory Factor 1 (NRF1) Mediated Transcriptional Gene Signatures are Associated with the Severity of Cerebral Amyloid Angiopathy. Mol Neurobiol 2024; 61:835-882. [PMID: 37668961 DOI: 10.1007/s12035-023-03541-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 07/25/2023] [Indexed: 09/06/2023]
Abstract
Cerebral amyloid angiopathy (CAA) is a degenerative vasculopathy. We have previously shown that transcription regulating proteins- inhibitor of DNA binding protein 3 (ID3) and the nuclear respiratory factor 1 (NRF1) contribute to vascular dysregulation. In this study, we have identified sex specific ID3 and NRF1-mediated gene networks in CAA patients diagnosed with Alzheimer's Disease (AD). High expression of ID3 mRNA coupled with low NRF1 mRNA levels was observed in the temporal cortex of men and women CAA patients. Low NRF1 mRNA expression in the temporal cortex was found in men with severe CAA. High ID3 expression was found in women with the genetic risk factor APOE4. Low NRF1 expression was also associated with APOE4 in women with CAA. Genome wide transcriptional activity of both ID3 and NRF1 paralleled their mRNA expression levels. Sex specific differences in transcriptional gene signatures of both ID3 and NRF1 were observed. These findings were further corroborated by Bayesian machine learning and the GeNIe simulation models. Dynamic machine learning using a Monte Carlo Markov Chain (MCMC) gene ordering approach revealed that ID3 was associated with disease severity in women. NRF1 was associated with CAA and severity of this disease in men. These findings suggest that aberrant ID3 and NRF1 activity presumably plays a major role in the pathogenesis and severity of CAA. Further analyses of ID3- and NRF1-regulated molecular drivers of CAA may provide new targets for personalized medicine and/or prevention strategies against CAA.
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Affiliation(s)
- Christian Michael Perez
- Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Zhenghua Gong
- Department of Biostatistics, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Changwon Yoo
- Department of Biostatistics, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Deodutta Roy
- Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Alok Deoraj
- Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA
| | - Quentin Felty
- Department of Environmental Health Sciences, Robert Stempel College of Public Health and Social Work, Florida International University, Miami, FL, USA.
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Jiang H, Nair V, Sun Y, Ding C. The diverse roles of peroxisomes in the interplay between viruses and mammalian cells. Antiviral Res 2024; 221:105780. [PMID: 38092324 DOI: 10.1016/j.antiviral.2023.105780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 12/01/2023] [Accepted: 12/04/2023] [Indexed: 12/26/2023]
Abstract
Peroxisomes are ubiquitous organelles found in eukaryotic cells that play a critical role in the oxidative metabolism of lipids and detoxification of reactive oxygen species (ROS). Recently, the role of peroxisomes in viral infections has been extensively studied. Although several studies have reported that peroxisomes exert antiviral activity, evidence indicates that viruses have also evolved diverse strategies to evade peroxisomal antiviral signals. In this review, we summarize the multiple roles of peroxisomes in the interplay between viruses and mammalian cells. Focus is given on the peroxisomal regulation of innate immune response, lipid metabolism, ROS production, and viral regulation of peroxisomal biosynthesis and degradation. Understanding the interactions between peroxisomes and viruses provides novel insights for the development of new antiviral strategies.
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Affiliation(s)
- Hui Jiang
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, China
| | - Venugopal Nair
- Avian Oncogenic Viruses Group, UK-China Centre of Excellence in Avian Disease Research, The Pirbright Institute, Pirbright, Guildford, Surrey, United Kingdom
| | - Yingjie Sun
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, China.
| | - Chan Ding
- Department of Avian Infectious Diseases, Shanghai Veterinary Research Institute. Chinese Academy of Agricultural Science, Shanghai, China; Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, 225009, Jiangsu Province, China.
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7
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Bremova-Ertl T, Hofmann J, Stucki J, Vossenkaul A, Gautschi M. Inborn Errors of Metabolism with Ataxia: Current and Future Treatment Options. Cells 2023; 12:2314. [PMID: 37759536 PMCID: PMC10527548 DOI: 10.3390/cells12182314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2023] [Revised: 09/09/2023] [Accepted: 09/15/2023] [Indexed: 09/29/2023] Open
Abstract
A number of hereditary ataxias are caused by inborn errors of metabolism (IEM), most of which are highly heterogeneous in their clinical presentation. Prompt diagnosis is important because disease-specific therapies may be available. In this review, we offer a comprehensive overview of metabolic ataxias summarized by disease, highlighting novel clinical trials and emerging therapies with a particular emphasis on first-in-human gene therapies. We present disease-specific treatments if they exist and review the current evidence for symptomatic treatments of these highly heterogeneous diseases (where cerebellar ataxia is part of their phenotype) that aim to improve the disease burden and enhance quality of life. In general, a multimodal and holistic approach to the treatment of cerebellar ataxia, irrespective of etiology, is necessary to offer the best medical care. Physical therapy and speech and occupational therapy are obligatory. Genetic counseling is essential for making informed decisions about family planning.
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Affiliation(s)
- Tatiana Bremova-Ertl
- Department of Neurology, University Hospital Bern (Inselspital) and University of Bern, 3010 Bern, Switzerland; (J.H.); (J.S.)
- Center for Rare Diseases, University Hospital Bern (Inselspital) and University of Bern, 3010 Bern, Switzerland
| | - Jan Hofmann
- Department of Neurology, University Hospital Bern (Inselspital) and University of Bern, 3010 Bern, Switzerland; (J.H.); (J.S.)
| | - Janine Stucki
- Department of Neurology, University Hospital Bern (Inselspital) and University of Bern, 3010 Bern, Switzerland; (J.H.); (J.S.)
| | - Anja Vossenkaul
- Division of Pediatric Endocrinology, Diabetes and Metabolism, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland; (A.V.); (M.G.)
| | - Matthias Gautschi
- Division of Pediatric Endocrinology, Diabetes and Metabolism, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland; (A.V.); (M.G.)
- Institute of Clinical Chemistry, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland
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8
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Galarreta CI, Wong K, Carmichael J, Woods J, Tise CG, Niehaus AD, Schildt AJ, Verscaj CP, Cusmano-Ozog KP. A homozygous Gly470Ala variant in PEX6 causes severe Zellweger spectrum disorder. Am J Med Genet A 2023; 191:2057-2063. [PMID: 37144748 DOI: 10.1002/ajmg.a.63234] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 04/21/2023] [Accepted: 04/26/2023] [Indexed: 05/06/2023]
Abstract
Zellweger spectrum disorder (ZSD) is a group of autosomal recessive disorders caused by biallelic pathogenic variants in any one of the 13 PEX genes essential for peroxisomal biogenesis. We report a cohort of nine infants who presented at birth with severe neonatal features suggestive of ZSD and found to be homozygous for a variant in PEX6 (NM_000287.4:c.1409G > C[p.Gly470Ala]). All were of Mixtec ancestry and identified by the California Newborn Screening (NBS) Program to have elevated C26:0-lysophosphatidylcholine but no reportable variants in ABCD1. The clinical and biochemical features of this cohort are described within. Gly470Ala may represent a founder variant in the Mixtec population of Central California. ZSD should be considered in patients who present at birth with severe hypotonia and enlarged fontanelles, especially in the setting of an abnormal NBS, Mixtec ancestry, or family history of infant death. There is a need to further characterize the natural history of ZSD, the Gly470Ala variant, and expand upon possible genotype-phenotype correlations.
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Affiliation(s)
- Carolina I Galarreta
- Medical Genetics and Metabolism Department, Valley Children's Hospital, Madera, California, USA
| | - Karen Wong
- Department of Pediatrics, Valley Children's Hospital, Madera, California, USA
| | - Jason Carmichael
- Medical Genetics and Metabolism Department, Valley Children's Hospital, Madera, California, USA
| | - Jeremy Woods
- Medical Genetics and Metabolism Department, Valley Children's Hospital, Madera, California, USA
| | - Christina G Tise
- Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital and Stanford University, Stanford, California, USA
| | - Annie D Niehaus
- Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital and Stanford University, Stanford, California, USA
| | - Alison J Schildt
- Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital and Stanford University, Stanford, California, USA
| | - Courtney P Verscaj
- Division of Medical Genetics, Department of Pediatrics, Lucile Packard Children's Hospital and Stanford University, Stanford, California, USA
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Slanina AM, Coman AE, Anton-Păduraru DT, Popa E, Barbacariu CL, Novac O, Petroaie AD, Bacușcă AI, Manole M, Cosmescu A. PEX6 Mutation in a Child with Infantile Refsum Disease—A Case Report and Literature Review. CHILDREN 2023; 10:children10030530. [PMID: 36980088 PMCID: PMC10047879 DOI: 10.3390/children10030530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 03/06/2023] [Accepted: 03/07/2023] [Indexed: 03/11/2023]
Abstract
The aim of this paper is to describe the temporal progression and clinical picture of a 2-year-old child with infantile Refsum disease, as well as the diagnostic procedures performed; this case presented multiple hematologic, metabolic, and developmental complications and progressive disabilities. Genetic testing revealed a mutation of the PEX6 (Peroxisomal Biogenesis Factor 6) gene, and the metabolic profile was consistent with the diagnosis. Particularly, the child also presented altered coagulation factors and developed a spontaneous brain hemorrhage. The clinical picture includes several neurological, ophthalmological, digestive, cutaneous, and endocrine disorders as a result of the very long chain fatty acid accumulation as well as secondary oxidative anomalies. The study of metabolic disorders occurring because of genetic mutations is a subject of core importance in the pathology of children today. The PEX mutations, difficult to identify antepartum, are linked to an array of cell anomalies with severe consequences on the patient’s status, afflicting multiple organs and systems. This is the reason for which our case history may be relevant, including a vast number of symptoms, as well as modified biological parameters.
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Affiliation(s)
- Ana-Maria Slanina
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Adorata-Elena Coman
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Dana-Teodora Anton-Păduraru
- Department of Mother and Child Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
- Correspondence:
| | - Elena Popa
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Carmen-Liliana Barbacariu
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Otilia Novac
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Antoneta Dacia Petroaie
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Agnes-Iacinta Bacușcă
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Mihaela Manole
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
| | - Adriana Cosmescu
- Department of Family Medicine, “Grigore T. Popa” University of Medicine and Pharmacy, Iași 700115, Romania
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10
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Horcas-Nieto JM, Versloot CJ, Langelaar-Makkinje M, Gerding A, Blokzijl T, Koster MH, Baanstra M, Martini IA, Coppes RP, Bourdon C, van Ijzendoorn SCD, Kim P, Bandsma RHJ, Bakker BM. Organoids as a model to study intestinal and liver dysfunction in severe malnutrition. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166635. [PMID: 36581145 DOI: 10.1016/j.bbadis.2022.166635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2022] [Revised: 12/02/2022] [Accepted: 12/20/2022] [Indexed: 12/27/2022]
Affiliation(s)
- José M Horcas-Nieto
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands
| | - Christian J Versloot
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands
| | - Miriam Langelaar-Makkinje
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands
| | - Albert Gerding
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands; Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Tjasso Blokzijl
- Department of Gastroenterology and Hepatology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Mirjam H Koster
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands
| | - Mirjam Baanstra
- Department of Biomedical Sciences of Cell & Systems, Section Molecular Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Ingrid A Martini
- Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Robert P Coppes
- Department of Biomedical Sciences of Cell & Systems, Section Molecular Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Céline Bourdon
- Translational Medicine, Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Toronto, ON, Canada
| | - Sven C D van Ijzendoorn
- Department of Biomedical Sciences of Cell & Systems, Section Molecular Cell Biology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands
| | - Peter Kim
- Translational Medicine, Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Toronto, ON, Canada; Department of Biochemistry, University of Toronto, Toronto, ON, Canada
| | - Robert H J Bandsma
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands; Translational Medicine, Peter Gilgan Centre for Research and Learning, The Hospital for Sick Children, Toronto, ON, Canada; Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Division of Gastroenterology, Hepatology, and Nutrition, The Hospital for Sick Children, Toronto, ON, Canada.
| | - Barbara M Bakker
- Laboratory of Pediatrics, Center for Liver, Digestive and Metabolic Diseases, University of Groningen, University Medical Center Groningen, the Netherlands.
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11
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Deori NM, Infant T, Thummer RP, Nagotu S. Characterization of the Multiple Domains of Pex30 Involved in Subcellular Localization of the Protein and Regulation of Peroxisome Number. Cell Biochem Biophys 2023; 81:39-47. [PMID: 36462131 DOI: 10.1007/s12013-022-01122-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 11/22/2022] [Indexed: 12/05/2022]
Abstract
Pex30 is a peroxisomal protein whose role in peroxisome biogenesis via the endoplasmic reticulum has been established. It is a 58 KDa multi-domain protein that facilitates contact site formation between various organelles. The present study aimed to investigate the role of various domains of the protein in its sub-cellular localization and regulation of peroxisome number. For this, we created six truncations of the protein (1-87, 1-250, 1-352, 88-523, 251-523 and 353-523) and tagged GFP at the C-terminus. Biochemical methods and fluorescence microscopy were used to characterize the effect of truncation on expression and localization of the protein. Quantitative analysis was performed to determine the effect of truncation on peroxisome number in these cells. Expression of the truncated variants in cells lacking PEX30 did not cause any effect on cell growth. Interestingly, variable expression and localization of the truncated variants in both peroxisome-inducing and non-inducing medium was observed. Truncated variants depicted different distribution patterns such as punctate, reticulate and cytosolic fluorescence. Interestingly, lack of the complete dysferlin domain or C-Dysf resulted in increased peroxisome number similar to as reported for cells lacking Pex30. No contribution of this domain in the reticulate distribution of the proteins was also observed. Our results show an interesting role for the various domains of Pex30 in localization and regulation of peroxisome number.
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Affiliation(s)
- Nayan Moni Deori
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Terence Infant
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Rajkumar P Thummer
- Laboratory for Stem Cell Engineering and Regenerative Medicine, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India
| | - Shirisha Nagotu
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, Assam, 781039, India.
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12
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Di Cara F, Savary S, Kovacs WJ, Kim P, Rachubinski RA. The peroxisome: an up-and-coming organelle in immunometabolism. Trends Cell Biol 2023; 33:70-86. [PMID: 35788297 DOI: 10.1016/j.tcb.2022.06.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 05/31/2022] [Accepted: 06/03/2022] [Indexed: 12/27/2022]
Abstract
Peroxisomes are essential metabolic organelles, well known for their roles in the metabolism of complex lipids and reactive ionic species. In the past 10 years, peroxisomes have also been cast as central regulators of immunity. Lipid metabolites of peroxisomes, such as polyunsaturated fatty acids (PUFAs), are precursors for important immune mediators, including leukotrienes (LTs) and resolvins. Peroxisomal redox metabolism modulates cellular immune signaling such as nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) activation. Additionally, peroxisomal β-oxidation and ether lipid synthesis control the development and aspects of the activation of both innate and adaptive immune cells. Finally, peroxisome number and metabolic activity have been linked to inflammatory diseases. These discoveries have opened avenues of investigation aimed at targeting peroxisomes for therapeutic intervention in immune disorders, inflammation, and cancer.
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Affiliation(s)
- Francesca Di Cara
- Dalhousie University, Department of Microbiology and Immunology, Halifax, NS B3K 6R8, Canada.
| | - Stéphane Savary
- Lab. Bio-PeroxIL EA7270, University of Bourgogne Franche-Comté, 6 Bd Gabriel, 21000 Dijon, France
| | - Werner J Kovacs
- Institute of Molecular Health Sciences, Swiss Federal Institute of Technology in Zurich (ETH Zürich), Zurich, Switzerland
| | - Peter Kim
- Cell Biology Program, Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, Toronto, ON, Canada; Department of Biochemistry, University of Toronto, Toronto, ON, Canada; Department of Biomedical Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, South Korea
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13
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Walia A, Birath AL, Buchman CA. Cochlear implantation and audiological findings in a child with Zellweger spectrum disorder. OTOLARYNGOLOGY CASE REPORTS 2023. [DOI: 10.1016/j.xocr.2023.100513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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14
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Wanders RJA, Baes M, Ribeiro D, Ferdinandusse S, Waterham HR. The physiological functions of human peroxisomes. Physiol Rev 2023; 103:957-1024. [PMID: 35951481 DOI: 10.1152/physrev.00051.2021] [Citation(s) in RCA: 51] [Impact Index Per Article: 51.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Peroxisomes are subcellular organelles that play a central role in human physiology by catalyzing a range of unique metabolic functions. The importance of peroxisomes for human health is exemplified by the existence of a group of usually severe diseases caused by an impairment in one or more peroxisomal functions. Among others these include the Zellweger spectrum disorders, X-linked adrenoleukodystrophy, and Refsum disease. To fulfill their role in metabolism, peroxisomes require continued interaction with other subcellular organelles including lipid droplets, lysosomes, the endoplasmic reticulum, and mitochondria. In recent years it has become clear that the metabolic alliance between peroxisomes and other organelles requires the active participation of tethering proteins to bring the organelles physically closer together, thereby achieving efficient transfer of metabolites. This review intends to describe the current state of knowledge about the metabolic role of peroxisomes in humans, with particular emphasis on the metabolic partnership between peroxisomes and other organelles and the consequences of genetic defects in these processes. We also describe the biogenesis of peroxisomes and the consequences of the multiple genetic defects therein. In addition, we discuss the functional role of peroxisomes in different organs and tissues and include relevant information derived from model systems, notably peroxisomal mouse models. Finally, we pay particular attention to a hitherto underrated role of peroxisomes in viral infections.
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Affiliation(s)
- Ronald J A Wanders
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Pediatrics, Emma Children's Hospital, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,United for Metabolic Diseases, Amsterdam, The Netherlands
| | - Myriam Baes
- Laboratory of Cell Metabolism, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, Leuven, Belgium
| | - Daniela Ribeiro
- Institute of Biomedicine (iBiMED) and Department of Medical Sciences, University of Aveiro, Aveiro, Portugal
| | - Sacha Ferdinandusse
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,United for Metabolic Diseases, Amsterdam, The Netherlands
| | - Hans R Waterham
- Laboratory Genetic Metabolic Diseases, Department of Clinical Chemistry, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,Department of Pediatrics, Emma Children's Hospital, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.,United for Metabolic Diseases, Amsterdam, The Netherlands
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15
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Mauriac SA, Peineau T, Zuberi A, Lutz C, Géléoc GSG. Loss of Pex1 in Inner Ear Hair Cells Contributes to Cochlear Synaptopathy and Hearing Loss. Cells 2022; 11:cells11243982. [PMID: 36552747 PMCID: PMC9777190 DOI: 10.3390/cells11243982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2022] [Revised: 12/04/2022] [Accepted: 12/06/2022] [Indexed: 12/13/2022] Open
Abstract
Peroxisome Biogenesis Disorders (PBD) and Zellweger syndrome spectrum disorders (ZSD) are rare genetic multisystem disorders that include hearing impairment and are associated with defects in peroxisome assembly, function, or both. Mutations in 13 peroxin (PEX) genes have been found to cause PBD-ZSD with ~70% of patients harboring mutations in PEX1. Limited research has focused on the impact of peroxisomal disorders on auditory function. As sensory hair cells are particularly vulnerable to metabolic changes, we hypothesize that mutations in PEX1 lead to oxidative stress affecting hair cells of the inner ear, subsequently resulting in hair cell degeneration and hearing loss. Global deletion of the Pex1 gene is neonatal lethal in mice, impairing any postnatal studies. To overcome this limitation, we created conditional knockout mice (cKO) using Gfi1Creor VGlut3Cre expressing mice crossed to floxed Pex1 mice to allow for selective deletion of Pex1 in the hair cells of the inner ear. We find that Pex1 excision in inner hair cells (IHCs) leads to progressive hearing loss associated with significant decrease in auditory brainstem responses (ABR), specifically ABR wave I amplitude, indicative of synaptic defects. Analysis of IHC synapses in cKO mice reveals a decrease in ribbon synapse volume and functional alterations in exocytosis. Concomitantly, we observe a decrease in peroxisomal number, indicative of oxidative stress imbalance. Taken together, these results suggest a critical function of Pex1 in development and maturation of IHC-spiral ganglion synapses and auditory function.
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Affiliation(s)
- Stephanie A. Mauriac
- Department of Otolaryngology, Boston Children’s Hospital, Boston, MA 02115, USA
- Kirby Neurobiology Center, Harvard Medical School, Boston, MA 02115, USA
| | - Thibault Peineau
- Department of Otolaryngology, Boston Children’s Hospital, Boston, MA 02115, USA
- Kirby Neurobiology Center, Harvard Medical School, Boston, MA 02115, USA
| | - Aamir Zuberi
- Rare Disease Translational Center, The Jackson Laboratory, Bar Harbor, ME 04609, USA
- Technology Evaluation and Development Research Laboratory, The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Cathleen Lutz
- Rare Disease Translational Center, The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Gwénaëlle S. G. Géléoc
- Department of Otolaryngology, Boston Children’s Hospital, Boston, MA 02115, USA
- Kirby Neurobiology Center, Harvard Medical School, Boston, MA 02115, USA
- Correspondence: ; Tel.: +1-617-919-4061
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16
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Diagnostic Odyssey in an Adult Patient with Ophthalmologic Abnormalities and Hearing Loss: Contribution of RNA-Seq to the Diagnosis of a PEX1 Deficiency. Int J Mol Sci 2022; 23:ijms232012367. [PMID: 36293220 PMCID: PMC9604267 DOI: 10.3390/ijms232012367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/11/2022] [Accepted: 10/13/2022] [Indexed: 11/07/2022] Open
Abstract
Peroxisomal biogenesis disorders (PBDs) are a heterogeneous group of genetic diseases. Multiple peroxisomal pathways are impaired, and very long chain fatty acids (VLCFA) are the first line biomarkers for the diagnosis. The clinical presentation of PBDs may range from severe, lethal multisystemic disorders to milder, late-onset disease. The vast majority of PBDs belong to Zellweger Spectrum Disordes (ZSDs) and represents a continuum of overlapping clinical symptoms, with Zellweger syndrome being the most severe and Heimler syndrome the less severe disease. Mild clinical conditions frequently present normal or slight biochemical alterations, making the diagnosis of these patients challenging. In the present study we used a combined WES and RNA-seq strategy to diagnose a patient presenting with retinal dystrophy as the main clinical symptom. Results showed the patient was compound heterozygous for mutations in PEX1. VLCFA were normal, but retrospective analysis of lysosphosphatidylcholines (LPC) containing C22:0–C26:0 species was altered. This simple test could avoid the diagnostic odyssey of patients with mild phenotype, such as the individual described here, who was diagnosed very late in adult life. We provide functional data in cell line models that may explain the mild phenotype of the patient by demonstrating the hypomorphic nature of a deep intronic variant altering PEX1 mRNA processing.
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17
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Colasuonno F, Marioli C, Tartaglia M, Bertini E, Compagnucci C, Moreno S. New Insights into the Neurodegeneration Mechanisms Underlying Riboflavin Transporter Deficiency (RTD): Involvement of Energy Dysmetabolism and Cytoskeletal Derangement. Biomedicines 2022; 10:biomedicines10061329. [PMID: 35740351 PMCID: PMC9219947 DOI: 10.3390/biomedicines10061329] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 05/26/2022] [Accepted: 05/30/2022] [Indexed: 01/18/2023] Open
Abstract
Riboflavin transporter deficiency (RTD) is a rare genetic disorder characterized by motor, sensory and cranial neuropathy. This childhood-onset neurodegenerative disease is caused by biallelic pathogenic variants in either SLC52A2 or SLC52A3 genes, resulting in insufficient supply of riboflavin (vitamin B2) and consequent impairment of flavoprotein-dependent metabolic pathways. Current therapy, empirically based high-dose riboflavin supplementation, ameliorates the progression of the disease, even though response to treatment is variable and partial. Recent studies have highlighted concurrent pathogenic contribution of cellular energy dysmetabolism and cytoskeletal derangement. In this context, patient specific RTD models, based on induced pluripotent stem cell (iPSC) technology, have provided evidence of redox imbalance, involving mitochondrial and peroxisomal dysfunction. Such oxidative stress condition likely causes cytoskeletal perturbation, associated with impaired differentiation of RTD motor neurons. In this review, we discuss the most recent findings obtained using different RTD models. Relevantly, the integration of data from innovative iPSC-derived in vitro models and invertebrate in vivo models may provide essential information on RTD pathophysiology. Such novel insights are expected to suggest custom therapeutic strategies, especially for those patients unresponsive to high-dose riboflavin treatments.
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Affiliation(s)
- Fiorella Colasuonno
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (F.C.); (C.M.); (M.T.); (E.B.)
- Department of Science, LIME, University Roma Tre, 00165 Rome, Italy
| | - Chiara Marioli
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (F.C.); (C.M.); (M.T.); (E.B.)
- Department of Science, LIME, University Roma Tre, 00165 Rome, Italy
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (F.C.); (C.M.); (M.T.); (E.B.)
| | - Enrico Bertini
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (F.C.); (C.M.); (M.T.); (E.B.)
| | - Claudia Compagnucci
- Genetics and Rare Diseases Research Division, Bambino Gesù Children’s Hospital, IRCCS, 00165 Rome, Italy; (F.C.); (C.M.); (M.T.); (E.B.)
- Correspondence: (C.C.); (S.M.)
| | - Sandra Moreno
- Department of Science, LIME, University Roma Tre, 00165 Rome, Italy
- Correspondence: (C.C.); (S.M.)
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18
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Lin Z, Li Z, Guo Z, Cao Y, Li J, Liu P, Li Z. Epigenetic Reader Bromodomain Containing Protein 2 Facilitates Pathological Cardiac Hypertrophy via Regulating the Expression of Citrate Cycle Genes. Front Pharmacol 2022; 13:887991. [PMID: 35694272 PMCID: PMC9174549 DOI: 10.3389/fphar.2022.887991] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Accepted: 04/25/2022] [Indexed: 12/02/2022] Open
Abstract
The bromodomain and extra-terminal domain proteins (BETs) family serve as epigenetic “readers”, which recognize the acetylated histones and recruit transcriptional regulator complexes to chromatin, eventually regulating gene transcription. Accumulating evidences demonstrate that pan BET inhibitors (BETi) confer protection against pathological cardiac hypertrophy, a precursor progress for developing heart failure. However, the roles of BET family members, except BRD4, remain unknown in pathological cardiac hypertrophy. The present study identified BRD2 as a novel regulator in cardiac hypertrophy, with a distinct mechanism from BRD4. BRD2 expression was elevated in cardiac hypertrophy induced by β-adrenergic agonist isoprenaline (ISO) in vivo and in vitro. Overexpression of BRD2 upregulated the expression of hypertrophic biomarkers and increased cell surface area, whereas BRD2 knockdown restrained ISO-induced cardiomyocyte hypertrophy. In vivo, rats received intramyocardial injection of adeno-associated virus (AAV) encoding siBRD2 significantly reversed ISO-induced pathological cardiac hypertrophy, cardiac fibrosis, and cardiac function dysregulation. The bioinformatic analysis of whole-genome sequence data demonstrated that a majority of metabolic genes, in particular those involved in TCA cycle, were under regulation by BRD2. Real-time PCR results confirmed that the expressions of TCA cycle genes were upregulated by BRD2, but were downregulated by BRD2 silencing in ISO-treated cardiomyocytes. Results of mitochondrial oxygen consumption rate (OCR) and ATP production measurement demonstrated that BRD2 augmented cardiac metabolism during cardiac hypertrophy. In conclusion, the present study revealed that BRD2 could facilitate cardiac hypertrophy through upregulating TCA cycle genes. Strategies targeting inhibition of BRD2 might suggest therapeutic potential for pathological cardiac hypertrophy and heart failure.
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Affiliation(s)
- Zhirong Lin
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
| | - Zhenzhen Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
| | - Zhen Guo
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
| | - Yanjun Cao
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
| | - Jingyan Li
- International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University of Chinese Medicine, Guangzhou, China
| | - Peiqing Liu
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
- *Correspondence: Peiqing Liu, ; Zhuoming Li,
| | - Zhuoming Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences, National and Local United Engineering Lab of Druggability and New Drugs Evaluation, Guangdong Engineering Laboratory of Druggability and New Drug Evaluation, Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, Guangzhou, China
- *Correspondence: Peiqing Liu, ; Zhuoming Li,
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19
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Meghnem D, Leong E, Pinelli M, Marshall JS, Di Cara F. Peroxisomes Regulate Cellular Free Fatty Acids to Modulate Mast Cell TLR2, TLR4, and IgE-Mediated Activation. Front Cell Dev Biol 2022; 10:856243. [PMID: 35756999 PMCID: PMC9215104 DOI: 10.3389/fcell.2022.856243] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2022] [Accepted: 04/12/2022] [Indexed: 11/17/2022] Open
Abstract
Mast cells are specialized, tissue resident, immune effector cells able to respond to a wide range of stimuli. MCs are involved in the regulation of a variety of physiological functions, including vasodilation, angiogenesis and pathogen elimination. In addition, MCs recruit and regulate the functions of many immune cells such as dendritic cells, macrophages, T cells, B cells and eosinophils through their selective production of multiple cytokines and chemokines. MCs generate and release multi-potent molecules, such as histamine, proteases, prostanoids, leukotrienes, heparin, and many cytokines, chemokines, and growth factors through both degranulation dependent and independent pathways. Recent studies suggested that metabolic shifts dictate the activation and granule content secretion by MCs, however the metabolic signaling promoting these events is at its infancy. Lipid metabolism is recognized as a pivotal immunometabolic regulator during immune cell activation. Peroxisomes are organelles found across all eukaryotes, with a pivotal role in lipid metabolism and the detoxification of reactive oxygen species. Peroxisomes are one of the emerging axes in immunometabolism. Here we identified the peroxisome as an essential player in MCs activation. We determined that lack of functional peroxisomes in murine MCs causes a significant reduction of interleukin-6, Tumor necrosis factor and InterleukinL-13 following immunoglobulin IgE-mediated and Toll like receptor 2 and 4 activation compared to the Wild type (WT) BMMCs. We linked these defects in cytokine release to defects in free fatty acids homeostasis. In conclusion, our study identified the importance of peroxisomal fatty acids homeostasis in regulating mast cell-mediated immune functions.
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Affiliation(s)
- Dihia Meghnem
- Dalhousie Human Immunology and Inflammation Group, Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Pediatrics, Nova Scotia Health Authority IWK, Halifax, NS, Canada
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Edwin Leong
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
| | - Marinella Pinelli
- Department of Pediatrics, Nova Scotia Health Authority IWK, Halifax, NS, Canada
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
| | - Jean S. Marshall
- Dalhousie Human Immunology and Inflammation Group, Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- Department of Pathology, Dalhousie University, Halifax, NS, Canada
- *Correspondence: Jean S. Marshall, ; Francesca Di Cara,
| | - Francesca Di Cara
- Department of Pediatrics, Nova Scotia Health Authority IWK, Halifax, NS, Canada
- Department of Microbiology and Immunology, Dalhousie University, Halifax, NS, Canada
- *Correspondence: Jean S. Marshall, ; Francesca Di Cara,
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20
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Wang F, Gao Y, Zhou L, Chen J, Xie Z, Ye Z, Wang Y. USP30: Structure, Emerging Physiological Role, and Target Inhibition. Front Pharmacol 2022; 13:851654. [PMID: 35308234 PMCID: PMC8927814 DOI: 10.3389/fphar.2022.851654] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Accepted: 02/04/2022] [Indexed: 12/22/2022] Open
Abstract
Ubiquitin-specific protease 30 (USP30) is a deubiquitinating enzyme (DUB) belonging to the USP subfamily, which was found localized in the mitochondrial outer membrane and peroxisomes owing to its unique transmembrane domain. Structural study revealed that USP30 employed a unique catalytic triad and molecular architecture to preferentially cleave the Lys6 linked ubiquitin chains. USP30 plays an essential role in several cellular events, such as the PINK1/Parkin-mediated mitophagy, pexophagy, BAX/BAK-dependent apoptosis, and IKKβ–USP30–ACLY-regulated lipogenesis/tumorigenesis, and is tightly regulated by post-translational modification including phosphorylation and mono-ubiquitination. Dysregulation of USP30 is associated with a range of physiological disorders, such as neurodegenerative disease, hepatocellular carcinoma, pulmonary disorders, and peroxisome biogenesis disorders. Nowadays, scientists and many biopharmaceutical companies are making much effort to explore USP30 inhibitors including natural compounds, phenylalanine derivatives, N-cyano pyrrolidines, benzosulphonamide, and other compounds. For the treatment of pulmonary disorders, the study in Mission Therapeutics of USP30 inhibitor is already in the pre-clinical stage. In this review, we will summarize the current knowledge of the structure, regulation, emerging physiological role, and target inhibition of USP30, hoping to prompt further investigation and understanding of it.
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21
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Mice with a deficiency in Peroxisomal Membrane Protein 4 (PXMP4) display mild changes in hepatic lipid metabolism. Sci Rep 2022; 12:2512. [PMID: 35169201 PMCID: PMC8847483 DOI: 10.1038/s41598-022-06479-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 01/31/2022] [Indexed: 11/08/2022] Open
Abstract
Peroxisomes play an important role in the metabolism of a variety of biomolecules, including lipids and bile acids. Peroxisomal Membrane Protein 4 (PXMP4) is a ubiquitously expressed peroxisomal membrane protein that is transcriptionally regulated by peroxisome proliferator-activated receptor α (PPARα), but its function is still unknown. To investigate the physiological function of PXMP4, we generated a Pxmp4 knockout (Pxmp4-/-) mouse model using CRISPR/Cas9-mediated gene editing. Peroxisome function was studied under standard chow-fed conditions and after stimulation of peroxisomal activity using the PPARα ligand fenofibrate or by using phytol, a metabolite of chlorophyll that undergoes peroxisomal oxidation. Pxmp4-/- mice were viable, fertile, and displayed no changes in peroxisome numbers or morphology under standard conditions. Also, no differences were observed in the plasma levels of products from major peroxisomal pathways, including very long-chain fatty acids (VLCFAs), bile acids (BAs), and BA intermediates di- and trihydroxycholestanoic acid. Although elevated levels of the phytol metabolites phytanic and pristanic acid in Pxmp4-/- mice pointed towards an impairment in peroxisomal α-oxidation capacity, treatment of Pxmp4-/- mice with a phytol-enriched diet did not further increase phytanic/pristanic acid levels. Finally, lipidomic analysis revealed that loss of Pxmp4 decreased hepatic levels of the alkyldiacylglycerol class of neutral ether lipids, particularly those containing polyunsaturated fatty acids. Together, our data show that while PXMP4 is not critical for overall peroxisome function under the conditions tested, it may have a role in the metabolism of (ether)lipids.
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22
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Garikapati V, Colasante C, Baumgart-Vogt E, Spengler B. Sequential lipidomic, metabolomic, and proteomic analyses of serum, liver, and heart tissue specimens from peroxisomal biogenesis factor 11α knockout mice. Anal Bioanal Chem 2022; 414:2235-2250. [PMID: 35083512 PMCID: PMC8821073 DOI: 10.1007/s00216-021-03860-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Revised: 11/25/2021] [Accepted: 12/20/2021] [Indexed: 12/16/2022]
Abstract
Peroxisomes are versatile single membrane-enclosed cytoplasmic organelles, involved in reactive oxygen species (ROS) and lipid metabolism and diverse other metabolic processes. Peroxisomal disorders result from mutations in Pex genes-encoded proteins named peroxins (PEX proteins) and single peroxisomal enzyme deficiencies. The PEX11 protein family (α, β, and γ isoforms) plays an important role in peroxisomal proliferation and fission. However, their specific functions and the metabolic impact caused by their deficiencies have not been precisely characterized. To understand the systemic molecular alterations caused by peroxisomal defects, here we utilized untreated peroxisomal biogenesis factor 11α knockout (Pex11α KO) mouse model and performed serial relative-quantitative lipidomic, metabolomic, and proteomic analyses of serum, liver, and heart tissue homogenates. We demonstrated significant specific changes in the abundances of multiple lipid species, polar metabolites, and proteins and dysregulated metabolic pathways in distinct biological specimens of the Pex11α KO adult mice in comparison to the wild type (WT) controls. Overall, the present study reports comprehensive semi-quantitative molecular omics information of the Pex11α KO mice, which might serve in the future as a reference for a better understanding of the roles of Pex11α and underlying pathophysiological mechanisms of peroxisomal biogenesis disorders.
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Affiliation(s)
- Vannuruswamy Garikapati
- Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, 35392, Giessen, Germany.,Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University Giessen, 35392, Giessen, Germany
| | - Claudia Colasante
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University Giessen, 35392, Giessen, Germany
| | - Eveline Baumgart-Vogt
- Institute for Anatomy and Cell Biology II, Division of Medical Cell Biology, Justus Liebig University Giessen, 35392, Giessen, Germany.
| | - Bernhard Spengler
- Institute of Inorganic and Analytical Chemistry, Justus Liebig University Giessen, 35392, Giessen, Germany.
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A Retrospective Study of Hearing Loss in Patients Diagnosed with Peroxisome Biogenesis Disorders in the Zellweger Spectrum. Ear Hear 2022; 43:582-591. [PMID: 34534157 PMCID: PMC8881323 DOI: 10.1097/aud.0000000000001126] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Peroxisome Biogenesis Disorders in the Zellweger Spectrum (PBD-ZSD) are autosomal recessive disorders characterized by defects in peroxisome function, biosynthesis, and/or assembly. Despite its frequent documentation, hearing loss associated with PBD-ZSD has not been extensively characterized. The purpose of this retrospective natural history study was to better characterize the hearing loss associated with PBD-ZSD and to provide additional insight into the evaluation and management of PBD-ZSD patients with hearing loss. DESIGN Audiological data from medical records of 42 patients with PBD-ZSD or D-bifunctional protein deficiency were collected from an ongoing longitudinal retrospective natural history study. An initial dataset of 300 audiograms and/or audiometric test results from the 42 patients were used to characterize the degree of hearing loss, type of hearing loss, relationships between air and bone conduction thresholds, age-related changes in hearing loss, and benefit with amplification. RESULTS The majority of PBD-ZSD patients in this study presented with moderately-severe to severe hearing loss and relatively slow rates of longitudinal changes in hearing sensitivity. Improvements in hearing thresholds were observed with use of hearing aid amplification. Though bone conduction data were limited, air-bone gaps and air conduction threshold fluctuations observed in several patients suggest there may be an increased occurrence of mixed hearing losses in PBD-ZSD populations. CONCLUSION The results of this retrospective study provide insight into the hearing loss associated with PBD-ZSD, but also emphasize the need for more complete assessments of hearing loss type and middle ear function in these patients. The addition of more comprehensive datasets to the ongoing natural history study will enhance our understanding of the pathophysiology underlying PBD-ZSD and guide the development of targeted evaluation and management recommendations for patients with PBD-ZSD.
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Kumar P, Nerakh G, Katam P, Pratap Oleti T, Pawar S. A Floppy Infant with Facial Dysmorphism. Neoreviews 2022; 23:e45-e48. [PMID: 34970661 DOI: 10.1542/neo.23-1-e45] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Affiliation(s)
- Praneeth Kumar
- Department of Neonatology, Fernandez Hospital, Hyderabad, Andhra Pradesh, India
| | - Gayatri Nerakh
- Department of Fetal Medicine and Genetics, Fernandez Hospital, Hyderabad, Andhra Pradesh, India
| | - Priyanka Katam
- Department of Neonatology, Fernandez Hospital, Hyderabad, Andhra Pradesh, India
| | - Tejo Pratap Oleti
- Department of Neonatology, Fernandez Hospital, Hyderabad, Andhra Pradesh, India
| | - Sunil Pawar
- Department of Neonatology, Fernandez Hospital, Hyderabad, Andhra Pradesh, India
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25
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Tretter V, Hochreiter B, Zach ML, Krenn K, Klein KU. Understanding Cellular Redox Homeostasis: A Challenge for Precision Medicine. Int J Mol Sci 2021; 23:ijms23010106. [PMID: 35008532 PMCID: PMC8745322 DOI: 10.3390/ijms23010106] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/20/2021] [Accepted: 12/21/2021] [Indexed: 12/16/2022] Open
Abstract
Living organisms use a large repertoire of anabolic and catabolic reactions to maintain their physiological body functions, many of which include oxidation and reduction of substrates. The scientific field of redox biology tries to understand how redox homeostasis is regulated and maintained and which mechanisms are derailed in diverse pathological developments of diseases, where oxidative or reductive stress is an issue. The term “oxidative stress” is defined as an imbalance between the generation of oxidants and the local antioxidative defense. Key mediators of oxidative stress are reactive species derived from oxygen, nitrogen, and sulfur that are signal factors at physiological concentrations but can damage cellular macromolecules when they accumulate. However, therapeutical targeting of oxidative stress in disease has proven more difficult than previously expected. Major reasons for this are the very delicate cellular redox systems that differ in the subcellular compartments with regard to their concentrations and depending on the physiological or pathological status of cells and organelles (i.e., circadian rhythm, cell cycle, metabolic need, disease stadium). As reactive species are used as signaling molecules, non-targeted broad-spectrum antioxidants in many cases will fail their therapeutic aim. Precision medicine is called to remedy the situation.
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26
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Enns GM, Ammous Z, Himes RW, Nogueira J, Palle S, Sullivan M, Ramirez C. Diagnostic challenges and disease management in patients with a mild Zellweger spectrum disorder phenotype. Mol Genet Metab 2021; 134:217-222. [PMID: 34625341 DOI: 10.1016/j.ymgme.2021.09.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 09/20/2021] [Accepted: 09/22/2021] [Indexed: 11/19/2022]
Abstract
Peroxisome Biogenesis Disorders-Zellweger spectrum disorder (PBD-ZSD) is a rare, autosomal recessive peroxisome biogenesis disorder that presents with variable symptoms. In patients with PBD-ZSD, pathogenic variants in the PEX family of genes disrupt normal peroxisomal function, impairing α- and β-oxidation of very-long-chain fatty acids and synthesis of bile acids, resulting in increased levels of toxic bile acid intermediates and multisystem organ damage. The spectrum of severity in PBD-ZSD is variable, with some patients dying in the first year of life, while others live into adulthood. Symptoms of mild PBD-ZSD include various combinations of developmental delay, craniofacial dysmorphic features, visual impairment, sensorineural hearing loss, liver disease, and adrenal insufficiency. Disease progression in mild PBD-ZSD is generally slow, and may include extended periods of stability in some cases. The presence and extent to which symptoms occur in mild PBD-ZSD represents a diagnostic challenge that can cause delays in diagnosis with potential significant implications related to disease monitoring and treatment. There is some support for the pharmacologic therapies of Lorenzo's oil, docosohexanoic acid, and batyl alcohol in altering symptoms; however, systematic long-term studies are lacking. Cholic acid (CA) therapy has demonstrated treatment efficacy in patients with PBD-ZSD, including decreased toxic bile acid intermediates, transaminase levels, and liver inflammation, with improvement in growth parameters. However, these responses are most apparent in patients diagnosed and treated at a young age. Advanced liver disease may limit the efficacy of CA, underscoring the need to diagnose and treat these patients before significant liver damage and other related complications occur. Here we discuss the signs and symptoms of PBD-ZSD in patients with mild disease, standard diagnostic tools, factors affecting disease management, and available pharmacological interventions.
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Affiliation(s)
| | | | | | - Janaina Nogueira
- The University of Alabama at Birmingham, Children's of Alabama, Birmingham, AL, USA
| | - Sirish Palle
- Oklahoma University Medicine, Oklahoma City, OK, USA
| | - Meghan Sullivan
- MedVal Scientific Information Services, LLC, Princeton, NJ, USA
| | - Charina Ramirez
- University of Texas, Southwestern Medical Center, Children's Medical Center Dallas, Dallas, TX, USA
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27
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Anderson JN, Ammous Z, Eroglu Y, Hernandez E, Heubi J, Himes R, Palle S. Cholbam® and Zellweger spectrum disorders: treatment implementation and management. Orphanet J Rare Dis 2021; 16:388. [PMID: 34521419 PMCID: PMC8439061 DOI: 10.1186/s13023-021-01940-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Accepted: 07/02/2021] [Indexed: 01/12/2023] Open
Abstract
Background Zellweger spectrum disorders (ZSDs) are a rare, heterogenous group of autosomal recessively inherited disorders characterized by reduced peroxisomes numbers, impaired peroxisomal formation, and/or defective peroxisomal functioning. In the absence of functional peroxisomes, bile acid synthesis is disrupted, and multisystem disease ensues with abnormalities in the brain, liver, kidneys, muscle, eyes, ears, and nervous system. Main body Liver disease may play an important role in morbidity and mortality, with hepatic fibrosis that can develop as early as the postnatal period and often progressing to cirrhosis within the first year of life. Because hepatic dysfunction can have numerous secondary effects on other organ systems, thereby impacting the overall disease severity, the treatment of liver disease in patients with ZSD is an important focus of disease management. Cholbam® (cholic acid), approved by the U.S. Food and Drug Administration in March 2015, is currently the only therapy approved as adjunctive treatment for patients with ZSDs and single enzyme bile acid synthesis disorders. This review will focus on the use of CA therapy in the treatment of liver disease associated with ZSDs, including recommendations for initiating and maintaining CA therapy and the limitations of available clinical data supporting its use in this patient population. Conclusions Cholbam is a safe and well-tolerated treatment for patients with ZSDs that has been shown to improve liver chemistries and reduce toxic bile acid intermediates in the majority of patients with ZSD. Due to the systemic impacts of hepatic damage, Cholbam should be initiated in patients without signs of advanced liver disease.
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Affiliation(s)
- Janaina Nogueira Anderson
- Department of Pediatric Gastroenterology, Hepatology, and Nutrition, Medical University of South Carolina, 135 Rutledge Avenue, MSC 561, Charleston, SC, 29465, USA.
| | | | - Yasemen Eroglu
- Division of Pediatric Gastroenterology, Hepatology, Pancreatology and Nutrition, Stead Family Department of Pediatrics, IU Carver College of Medicine, Iowa City, IA, USA
| | - Erick Hernandez
- Department of Pediatric Gastroenterology, Hepatology and Nutrition, Pediatric Gastroenterology Associates, Nicklaus Children's Hospital, Miami, FL, USA
| | - James Heubi
- Divisions of Pediatric Gastroenterology, Hepatology and Nutrition and Pathology and Laboratory Medicine, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, OH, USA
| | - Ryan Himes
- Division of Pediatric Hepatology, Ochsner Health, New Orleans, LA, USA
| | - Sirish Palle
- Department of Pediatric Gastroenterology, Oklahoma University Medicine, Oklahoma City, OK, USA
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28
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Liu Y, Weaver CM, Sen Y, Eitzen G, Simmonds AJ, Linchieh L, Lurette O, Hebert-Chatelain E, Rachubinski RA, Di Cara F. The Nitric Oxide Donor, S-Nitrosoglutathione, Rescues Peroxisome Number and Activity Defects in PEX1G843D Mild Zellweger Syndrome Fibroblasts. Front Cell Dev Biol 2021; 9:714710. [PMID: 34434934 PMCID: PMC8382563 DOI: 10.3389/fcell.2021.714710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2021] [Accepted: 07/20/2021] [Indexed: 02/04/2023] Open
Abstract
Peroxisome biogenesis disorders (PBDs) are a group of metabolic developmental diseases caused by mutations in one or more genes encoding peroxisomal proteins. Zellweger syndrome spectrum (PBD-ZSS) results from metabolic dysfunction caused by damaged or non-functional peroxisomes and manifests as a multi-organ syndrome with significant morbidity and mortality for which there is no current drug therapy. Mild PBD-ZSS patients can exhibit a more progressive disease course and could benefit from the identification of drugs to improve the quality of life and extend the lifespan of affected individuals. Our study used a high-throughput screen of FDA-approved compounds to identify compounds that improve peroxisome function and biogenesis in human fibroblast cells carrying the mild PBD-ZSS variant, PEX1G843D. Our screen identified the nitrogen oxide donor, S-nitrosoglutathione (GSNO), as a potential therapeutic for this mild form of PBD-ZSS. Further biochemical characterization showed that GSNO enhances both peroxisome number and function in PEX1G843D mutant fibroblasts and leads to increased survival and longer lifespan in an in vivo humanized Drosophila model carrying the PEX1G843D mutation. GSNO is therefore a strong candidate to be translated to clinical trials as a potential therapeutic for mild PBD-ZSS.
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Affiliation(s)
- Yidi Liu
- Department of Cell Biology, University of Alberta, Edmonton, AB, Canada
| | - Ceileigh M Weaver
- Department of Microbiology and Immunology, IWK Research Centre, Dalhousie University, Halifax, NS, Canada
| | - Yarina Sen
- Department of Cell Biology, University of Alberta, Edmonton, AB, Canada
| | - Gary Eitzen
- Department of Cell Biology, University of Alberta, Edmonton, AB, Canada
| | - Andrew J Simmonds
- Department of Cell Biology, University of Alberta, Edmonton, AB, Canada
| | - Lilliana Linchieh
- Department of Cell Biology, University of Alberta, Edmonton, AB, Canada
| | - Olivier Lurette
- Department of Biology, University of Moncton, Moncton, NB, Canada
| | | | | | - Francesca Di Cara
- Department of Microbiology and Immunology, IWK Research Centre, Dalhousie University, Halifax, NS, Canada
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29
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Behrens KA, Girasek QL, Sickler A, Hyde J, Buonaccorsi VP. Regions of genetic divergence in depth-separated Sebastes rockfish species pairs: Depth as a potential driver of speciation. Mol Ecol 2021; 30:4259-4275. [PMID: 34181798 DOI: 10.1111/mec.16046] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/17/2021] [Accepted: 06/24/2021] [Indexed: 12/20/2022]
Abstract
Depth separation is a proposed driver of speciation in marine fishes, with marine rockfish (genus Sebastes) providing a potentially informative study system. Sebastes rockfishes are commercially and ecologically important. This genus encompasses more than one hundred species and the ecological and morphological variance between these species provides opportunity for identifying speciation-driving adaptations, particularly along a depth gradient. A reduced-representation sequencing method (ddRADseq) was used to compare 95 individuals encompassing six Sebastes species. In this study, we sought to identify regions of divergence between species that were indicative of divergent adaptation and reproductive barriers leading to speciation. A pairwise comparison of S. chrysomelas (black-and-yellow rockfish) and S. carnatus (gopher rockfish) FST values revealed three major regions of elevated genomic divergence, two of which were also present in the S. miniatus (vermilion rockfish) and S. crocotulus (sunset rockfish) comparison. These corresponded with regions of both elevated DXY values and reduced nucleotide diversity in two cases, suggesting a speciation-with-gene-flow evolutionary model followed by post-speciation selective sweeps within each species. Limited whole-genome resequencing was also performed to identify mutations with predicted effects between S. chrysomelas and S. carnatus. Within these islands, we identified important SNPs in genes involved in immune function and vision. This supports their potential role in speciation, as these are adaptive vectors noted in other organisms. Additionally, changes to genes involved in pigment expression and mate recognition shed light on how S. chrysomelas and S. carnatus may have become reproductively isolated.
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Affiliation(s)
- Kristen A Behrens
- Department of Biology, Juniata College, Huntingdon, Pennsylvania, USA
| | - Quinn L Girasek
- Department of Biology, Juniata College, Huntingdon, Pennsylvania, USA
| | - Alex Sickler
- Center for Data Driven Discovery in Biomedicine, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
| | - John Hyde
- Fisheries Resources Division, Southwest Fisheries Science Center, NOAA Fisheries, La Jolla, California, USA
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30
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Wang M, Li J, Ding Y, Cai S, Li Z, Liu P. PEX5 prevents cardiomyocyte hypertrophy via suppressing the redox-sensitive signaling pathways MAPKs and STAT3. Eur J Pharmacol 2021; 906:174283. [PMID: 34174269 DOI: 10.1016/j.ejphar.2021.174283] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Revised: 06/21/2021] [Accepted: 06/22/2021] [Indexed: 02/07/2023]
Abstract
Peroxisomal biogenesis factor 5 (PEX5) is a member of peroxisome biogenesis protein family which serves as a shuttle receptor for the import of peroxisome matrix protein. The function of PEX5 on cardiomyocyte hypertrophy remained to be elucidated. Our study demonstrated that the protein expression level of PEX5 was declined in primary neonatal rat cardiomyocytes treated with phenylephrine (PE) and hearts from cardiac hypertrophic rats induced by abdominal aortic constriction (AAC). Overexpression of PEX5 alleviated cardiomyocyte hypertrophy induced by PE, while silencing of PEX5 exacerbated cardiomyocyte hypertrophy. PEX5 improved redox imbalance by decreasing cellular reactive oxygen species level and preserving peroxisomal catalase. Moreover, PEX5 knockdown aggravated PE-induced activation of redox-sensitive signaling pathways, including mitogen-activated protein kinase (MAPK) pathway and signal transducer and activator of transcription 3 (STAT3); whereas PEX5 overexpression suppressed activation of MAPK and STAT3. But PEX5 did not affect PE-induced phosphorylation of mammalian target of rapamycin (mTOR). In conclusion, the present study suggests that PEX5 protects cardiomyocyte against hypertrophy via regulating redox homeostasis and inhibiting redox-sensitive signaling pathways MAPK and STAT3.
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Affiliation(s)
- Minghui Wang
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China
| | - Jingyan Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China; International Institute for Translational Chinese Medicine, School of Pharmaceutical Sciences, Guangzhou University Chinese Medicine, Guangzhou, Guangdong 510006, China
| | - Yanqing Ding
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China
| | - Sidong Cai
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China
| | - Zhuoming Li
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China.
| | - Peiqing Liu
- Department of Pharmacology and Toxicology, School of Pharmaceutical Sciences; National and Local United Engineering Lab of Druggability and New Drugs Evaluation; Guangdong Engineering Laboratory of Druggability and New Drug Evaluation; Guangdong Provincial Key Laboratory of New Drug Design and Evaluation, Sun Yat-sen University, China.
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Alamatsaz M, Jalalypour F, Hashemi MS, Shafeghati Y, Nasr-Esfahani MH, Ghaedi K. Compound heterozygous p. Arg949Trp and p. Gly970Ala mutations deteriorated the function of PEX1p: A study on PEX1 in a patient with Zellweger syndrome. J Cell Biochem 2021; 122:1229-1238. [PMID: 33955040 DOI: 10.1002/jcb.29945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Revised: 04/15/2021] [Accepted: 04/21/2021] [Indexed: 11/10/2022]
Abstract
The peroxisome is responsible for a variety of vital pathways in primary metabolism, including the very long-chain fatty-acid oxidation and plasmalogen lipid biosynthesis. Autosomal recessive disorder of the Zellweger spectrum (ZSD) is a major subset of peroxisome biogenesis disorders (PBDs) that can be caused by mutations in any of the 14 PEX genes. Zellweger syndrome (ZS) is the foremost common and severe phenotype within the heterogeneous ZSD. However, missense mutations encode proteins with residual functions, which are associated with phenotypes that are milder than ZS. Mutations in the PEX1 gene are among the most prevalent. PEX1 and PEX6 proteins, belonging to the AAA family of ATPases, form a hexameric complex, which is associated with peroxisome membranes and essential for peroxisome biology. In this study, a two-month-old Iranian boy with hypotonia, poor feeding, and difficulty in breathing was diagnosed with Zellweger syndrome. The parents of the patient were second cousins and healthy and no similar cases were observed in the parents' family. The PEX1 gene was sequenced in the patient and his parents. The compound heterozygous mutations, p. Arg949Trp and p. Gly970Ala, were identified in the patient, while the parents were heterozygous for these alleles. Sequence analysis of the mutant PEX1 D2 domain revealed that mutation p. Arg949Trp precisely occurred in a conserved arginine residue (P4 Arg), which hinders the substrate processing of the complex. Several database records have reported mutation p. Arg949Trp(R949W) but its clinical significance is given as uncertain. We report here a novel mutation, p. Gly970Ala, which is not recorded before and may prevent proper interaction of PEX1 and PEX6 proteins. In summary, the clinical findings and peroxisome profile of the patient suggested that compound heterozygosity for these two missense mutations resulted in a nonfunctional PEX1/PEX6 complex causing the severe ZS phenotype.
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Affiliation(s)
- Marzieh Alamatsaz
- Department of Biology, Division of Cellular and Molecular Biology, Nour Danesh Institute of Higher Education, Meymeh, Isfahan, Iran
| | - Farzaneh Jalalypour
- Faculty of Engineering and Natural Sciences, Sabanci University, Istanbul, Turkey
| | - Motahare-Sadat Hashemi
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Yousef Shafeghati
- Sarem Cell Research Center and Medical Genetics Department, Sarem Women Hospital, Tehran, Iran
| | - Mohammad Hossein Nasr-Esfahani
- Department of Animal Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Kamran Ghaedi
- Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Postal Code 81746-73441, Iran
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Masih S, Moirangthem A, Phadke SR. Twins with PEX7 related intellectual disability and cataract: Highlighting phenotypes of peroxisome biogenesis disorder 9B. Am J Med Genet A 2021; 185:1504-1508. [PMID: 33586206 DOI: 10.1002/ajmg.a.62110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 11/26/2020] [Accepted: 01/15/2021] [Indexed: 01/13/2023]
Abstract
Peroxisome biogenesis disorders (PBDs) are a group of autosomal recessive disorders caused due to impaired peroxisome assembly affecting the formation of functional peroxisomes. PBDs are caused by a mutation in PEX gene family resulting in disease manifestation with extreme variability ranging from the onset of profound neurologic symptoms in newborns to progressive degenerative disease in adults. Disease causing variations in PEX7 is known to cause severe rhizomelic chondrodysplasia punctata type 1 and PBD 9B, an allelic disorder resulting in a milder phenotype, often indistinguishable from that of classic Refsum disease. This case report highlights the variability of PEX7 related phenotypes and suggests that other than RCDP1 and late onset phenotype similar to Refsum disease, some cases present with cataract and neurodevelopmetal abnormalities during childhood without chondrodysplasia or rhizomelia. This report also underlines the importance of considering PBD 9B in children presenting with neurodevelopmental abnormalities especially if they have congenital cataract.
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Affiliation(s)
- Suzena Masih
- Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Amita Moirangthem
- Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
| | - Shubha R Phadke
- Department of Medical Genetics, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, India
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33
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Deb R, Joshi N, Nagotu S. Peroxisomes of the Brain: Distribution, Functions, and Associated Diseases. Neurotox Res 2021; 39:986-1006. [PMID: 33400183 DOI: 10.1007/s12640-020-00323-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 12/04/2020] [Accepted: 12/07/2020] [Indexed: 12/14/2022]
Abstract
Peroxisomes are versatile cell organelles that exhibit a repertoire of organism and cell-type dependent functions. The presence of oxidases and antioxidant enzymes is a characteristic feature of these organelles. The role of peroxisomes in various cell types in human health and disease is under investigation. Defects in the biogenesis of the organelle and its function lead to severe debilitating disorders. In this manuscript, we discuss the distribution and functions of peroxisomes in the nervous system and especially in the brain cells. The important peroxisomal functions in these cells and their role in the pathology of associated disorders such as neurodegeneration are highlighted in recent studies. Although the cause of the pathogenesis of these disorders is still not clearly understood, emerging evidence supports a crucial role of peroxisomes. In this review, we discuss research highlighting the role of peroxisomes in brain development and its function. We also provide an overview of the major findings in recent years that highlight the role of peroxisome dysfunction in various associated diseases.
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Affiliation(s)
- Rachayeeta Deb
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Neha Joshi
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India
| | - Shirisha Nagotu
- Organelle Biology and Cellular Ageing Lab, Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, Assam, India.
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Bharadwaj A, Wahi N, Saxena A. Occurrence of Inborn Errors of Metabolism in Newborns, Diagnosis and Prophylaxis. Endocr Metab Immune Disord Drug Targets 2020; 21:592-616. [PMID: 33357204 DOI: 10.2174/1871530321666201223110918] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Revised: 11/09/2020] [Accepted: 11/09/2020] [Indexed: 11/22/2022]
Abstract
Inborn errors of metabolism (IEM) are a heterogeneous group of rare genetic disorders that are generally transmitted as autosomal or X-linked recessive disorders. These defects arise due to mutations associated with specific gene(s), especially the ones associated with key metabolic enzymes. These enzymes or their product(s) are involved in various metabolic pathways, leading to the accumulation of intermediary metabolite(s), reflecting their toxic effects upon mutations. The diagnosis of these metabolic disorders is based on the biochemical analysis of the clinical manifestations produced and their molecular mechanism. Therefore, it is imperative to devise diagnostic tests with high sensitivity and specificity for early detection of IEM. Recent advances in biochemical and polymerase chain reaction-based genetic analysis along with pedigree and prenatal diagnosis can be life-saving in nature. The latest development in exome sequencing for rapid diagnosis and enzyme replacement therapy would facilitate the successful treatment of these metabolic disorders in the future. However, the longterm clinical implications of these genetic manipulations is still a matter of debate among intellectuals and requires further research.
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Affiliation(s)
- Alok Bharadwaj
- Department of Biotechnology, GLA University, Mathura, Uttar Pradesh, India
| | - Nitin Wahi
- Department of Bioinformatics, Pathfinder Research and Training Foundation, Greater Noida - 201308, Uttar Pradesh, India
| | - Aditya Saxena
- Department of Biotechnology, GLA University, Mathura, Uttar Pradesh, India
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35
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Bose M, Cuthbertson DD, Fraser MA, Roullet JB, Gibson KM, Schules DR, Gawron KM, Gamble MB, Sacra KM, Lopez MJ, Rizzo WB. Zellweger spectrum disorder: A cross-sectional study of symptom prevalence using input from family caregivers. Mol Genet Metab Rep 2020; 25:100694. [PMID: 33335840 PMCID: PMC7733019 DOI: 10.1016/j.ymgmr.2020.100694] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Accepted: 11/28/2020] [Indexed: 11/15/2022] Open
Abstract
Zellweger spectrum disorders (ZSD) are rare, debilitating genetic diseases of peroxisome biogenesis that affect multiple organ systems and present with broad clinical heterogeneity. Although many case studies have characterized the multitude of signs and symptoms associated with ZSD, there are few reports on the prevalence of symptoms to help inform the development of meaningful endpoints for future clinical trials in ZSD. In the present study, we used an online survey tool completed by family caregivers to study the occurrence, frequency and severity of symptoms in individuals diagnosed with ZSD. Responses from caregivers representing 54 living and 25 deceased individuals with ZSD were collected over an 8-month period. Both perception of disease severity and prevalence of various symptoms were greater in responses from family caregivers of deceased individuals compared to those of living individuals with ZSD. Compared with previous reports for ZSD, the combined prevalence of seizures (53%) and adrenal insufficiency (45%) were nearly twice as high. Overall, this community-engaged approach to rare disease data collection is the largest study reporting on the prevalence of symptoms in ZSD, and our findings suggest that previous reports may be underreporting the true prevalence of several symptoms in ZSD. Studies such as this used in conjunction with clinician- led reports may be useful for informing the design of future clinical trials addressing ZSD. Zellweger spectrum disorders (ZSD) are rare, genetic multi-system disorders. There are few reports on symptom prevalence in ZSD. We present the largest caregiver-reported study to date on ZSD symptom prevalence. This study will help develop appropriate outcomes for clinical trials in ZSD.
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Affiliation(s)
- Mousumi Bose
- Department of Nutrition and Food Stsudies, Montclair State University, 1 Normal Avenue, UN 2159, Montclair, NJ 07043, USA
| | - David D Cuthbertson
- Department of Health Informatics Institute, College of Medicine Pediatrics, University of South Florida, 4202 E Fowler Ave, Tampa, FL 33620, USA
| | - Marsha A Fraser
- Department of Health Informatics Institute, College of Medicine Pediatrics, University of South Florida, 4202 E Fowler Ave, Tampa, FL 33620, USA
| | - Jean-Baptiste Roullet
- Department of Pharmacotherapy, College of Pharmacy and Pharmaceutical Sciences, Washington State University, 412 E. Spokane Falls Blvd, Spokane, WA 99210, USA
| | - K Michael Gibson
- Department of Pharmacotherapy, College of Pharmacy and Pharmaceutical Sciences, Washington State University, 412 E. Spokane Falls Blvd, Spokane, WA 99210, USA
| | - Dana R Schules
- Department of Nutrition and Food Stsudies, Montclair State University, 1 Normal Avenue, UN 2159, Montclair, NJ 07043, USA
| | - Kelly M Gawron
- Department of Nutrition and Food Stsudies, Montclair State University, 1 Normal Avenue, UN 2159, Montclair, NJ 07043, USA
| | - Melissa B Gamble
- Global Foundation for Peroxisomal Disorders, P.O. Box 33238, Tulsa, OK 74153, USA
| | - Kathryn M Sacra
- Global Foundation for Peroxisomal Disorders, P.O. Box 33238, Tulsa, OK 74153, USA
| | - Melisa J Lopez
- Global Foundation for Peroxisomal Disorders, P.O. Box 33238, Tulsa, OK 74153, USA
| | - William B Rizzo
- Department of Pediatrics, University of Nebraska Medical Center University of Nebraska, 985940 Nebraska Medical Center - DRC II 4064, Omaha, NE 68198-5940, USA
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Lucaccioni L, Righi B, Cingolani GM, Lugli L, Della Casa E, Torcetta F, Iughetti L, Berardi A. Overwhelming sepsis in a neonate affected by Zellweger syndrome due to a compound heterozygosis in PEX 6 gene: a case report. BMC MEDICAL GENETICS 2020; 21:229. [PMID: 33213396 PMCID: PMC7678176 DOI: 10.1186/s12881-020-01175-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 11/12/2020] [Indexed: 12/21/2022]
Abstract
Background Peroxisome biogenesis disorders (PBDs) are a group of metabolic diseases caused by dysfunction of peroxisomes. Different forms of PBDs are described; the most severe one is the Zellweger syndrome (ZS). We report on an unusual presentation of Zellweger syndrome manifesting in a newborn with severe and fulminant sepsis, causing death during the neonatal period. Case presentation A term male Caucasian neonate presented at birth with hypotonia and poor feeding associated with dysmorphic craniofacial features and skeletal abnormalities. Blood tests showed progressive leukopenia; ultrasounds revealed cerebral and renal abnormalities. He died on the fourth day of life because of an irreversible Gram-negative sepsis. Post-mortem tests on blood and urine samples showed biochemical alterations suggestive of ZS confirmed by genetic test. Conclusions ZS is an early and severe forms of PBDs. Peroxisomes are known to be involved in lipid metabolism, but recent studies suggest their fundamental role in modulating immune response and inflammation. In case of clinical suspicion of ZS it is important to focus the attention on the prevention and management of infections that can rapidly progress to death.
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Affiliation(s)
- Laura Lucaccioni
- Neonatal Intensive Care Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Beatrice Righi
- Post Graduate School of Paediatrics, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Greta Miriam Cingolani
- Post Graduate School of Paediatrics, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Licia Lugli
- Neonatal Intensive Care Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Elisa Della Casa
- Neonatal Intensive Care Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Francesco Torcetta
- Neonatal Intensive Care Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
| | - Lorenzo Iughetti
- Pediatric Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy.
| | - Alberto Berardi
- Neonatal Intensive Care Unit, Department of Medical and Surgical Sciences of the Mothers, Children and Adults, University of Modena and Reggio Emilia, via del Pozzo 71, 41124, Modena, Italy
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Covill-Cooke C, Toncheva VS, Kittler JT. Regulation of peroxisomal trafficking and distribution. Cell Mol Life Sci 2020; 78:1929-1941. [PMID: 33141311 PMCID: PMC7966214 DOI: 10.1007/s00018-020-03687-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 09/02/2020] [Accepted: 10/19/2020] [Indexed: 12/18/2022]
Abstract
Peroxisomes are organelles that perform a wide range of essential metabolic processes. To ensure that peroxisomes are optimally positioned in the cell, they must be transported by both long- and short-range trafficking events in response to cellular needs. Here, we review our current understanding of the mechanisms by which the cytoskeleton and organelle contact sites alter peroxisomal distribution. Though the focus of the review is peroxisomal transport in mammalian cells, findings from flies and fungi are used for comparison and to inform the gaps in our understanding. Attention is given to the apparent overlap in regulatory mechanisms for mitochondrial and peroxisomal trafficking, along with the recently discovered role of the mitochondrial Rho-GTPases, Miro, in peroxisomal dynamics. Moreover, we outline and discuss the known pathological and pharmacological conditions that perturb peroxisomal positioning. We conclude by highlighting several gaps in our current knowledge and suggest future directions that require attention.
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Affiliation(s)
| | - Viktoriya S Toncheva
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, WC1E 6BT, UK
| | - Josef T Kittler
- Department of Neuroscience, Physiology and Pharmacology, University College London, London, WC1E 6BT, UK.
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Zaki MS, Issa MY, Thomas MM, Elbendary HM, Rafat K, Al Menabawy NM, Selim LA, Ismail S, Abdel-Salam GM, Gleeson JG. A founder mutation in PEX12 among Egyptian patients in peroxisomal biogenesis disorder. Neurol Sci 2020; 42:2737-2745. [PMID: 33123925 DOI: 10.1007/s10072-020-04843-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 10/17/2020] [Indexed: 10/23/2022]
Abstract
At least 14 distinctive PEX genes function in the biogenesis of peroxisomes. Biallelic alterations in the peroxisomal biogenesis factor 12 (PEX12) gene lead to Zellweger syndrome spectrum (ZSS) with variable clinical expressivity ranging from early lethality to mildly affected with long-term survival. Herein, we define 20 patients derived from 14 unrelated Egyptian families, 19 of which show a homozygous PEX12 in-frame (c.1047_1049del p.(Gln349del)) deletion. This founder mutation, reported rarely outside of Egypt, was associated with a uniformly severe phenotype. Patients showed developmental delay in early life followed by motor and mental regression, progressive hypotonia, unsteadiness, and lack of speech. Seventeen patients had sparse hair or partial alopecia, a striking feature that was not noted previously in PEX12. Neonatal cholestasis was manifested in 2 siblings. Neurodiagnostics showed consistent cerebellar atrophy and variable white matter demyelination, axonal neuropathy in about half, and cardiomyopathy in 10% of patients. A single patient with a compound heterozygous PEX12 mutation exhibited milder features with late childhood onset with gait disturbance and learning disability. Thus, the PEX12 relatively common founder mutation accounts for the majority of PEX12-related disease in Egypt and delineates a uniform clinical and radiographic phenotype.
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Affiliation(s)
- Maha S Zaki
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt.
| | - Mahmoud Y Issa
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Manal M Thomas
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Hasnaa M Elbendary
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Karima Rafat
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Nihal M Al Menabawy
- Neurology and Metabolic Division, Cairo University Children Hospital, Cairo, Egypt
| | - Laila A Selim
- Neurology and Metabolic Division, Cairo University Children Hospital, Cairo, Egypt
| | - Samira Ismail
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Ghada M Abdel-Salam
- Clinical Genetics Department, Human Genetics and Genome Research Division, National Research Centre, El-Tahrir Street, Dokki, Cairo, 12311, Egypt
| | - Joseph G Gleeson
- Department of Neurosciences, University of California and Rady Children's Institute for Genomic Medicine, Rady Children's Hospital San Diego, La Jolla, CA, 92093, USA
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Jo DS, Park NY, Cho DH. Peroxisome quality control and dysregulated lipid metabolism in neurodegenerative diseases. Exp Mol Med 2020; 52:1486-1495. [PMID: 32917959 PMCID: PMC8080768 DOI: 10.1038/s12276-020-00503-9] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/11/2020] [Accepted: 07/14/2020] [Indexed: 12/15/2022] Open
Abstract
In recent decades, the role of the peroxisome in physiology and disease conditions has become increasingly important. Together with the mitochondria and other cellular organelles, peroxisomes support key metabolic platforms for the oxidation of various fatty acids and regulate redox conditions. In addition, peroxisomes contribute to the biosynthesis of essential lipid molecules, such as bile acid, cholesterol, docosahexaenoic acid, and plasmalogen. Therefore, the quality control mechanisms that regulate peroxisome biogenesis and degradation are important for cellular homeostasis. Current evidence indicates that peroxisomal function is often reduced or dysregulated in various human disease conditions, such as neurodegenerative diseases. Here, we review the recent progress that has been made toward understanding the quality control systems that regulate peroxisomes and their pathological implications. Systematic studies of cellular organelles called peroxisomes are needed to determine their influence on the progression of neurodegenerative diseases. Peroxisomes play vital roles in biological processes including the metabolism of lipids and reactive oxygen species, and the synthesis of key molecules, including bile acid and cholesterol. Disruption to peroxisome activity has been linked to metabolic disorders, cancers and neurodegenerative conditions. Dong-Hyung Cho at Kyungpook National University in Daegu, South Korea, and coworkers reviewed current understanding of peroxisome regulation, with a particular focus on brain disorders. The quantity and activity of peroxisomes alter according to environmental and stress cues. The brain is lipid-rich, and even small changes in fatty acid composition may influence neuronal function. Changes in fatty acid metabolism are found in early stage Alzheimer’s and Parkinson’s diseases, but whether peroxisome disruption is responsible requires clarification.
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Affiliation(s)
- Doo Sin Jo
- Brain Science and Engineering Institute, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Na Yeon Park
- School of Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Dong-Hyung Cho
- Brain Science and Engineering Institute, Kyungpook National University, Daegu, 41566, Republic of Korea. .,School of Life Sciences, Kyungpook National University, Daegu, 41566, Republic of Korea.
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40
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Barillari MR, Karali M, Di Iorio V, Contaldo M, Piccolo V, Esposito M, Costa G, Argenziano G, Serpico R, Carotenuto M, Cappuccio G, Banfi S, Melillo P, Simonelli F. Mild form of Zellweger Spectrum Disorders (ZSD) due to variants in PEX1: Detailed clinical investigation in a 9-years-old female. Mol Genet Metab Rep 2020; 24:100615. [PMID: 32596134 PMCID: PMC7306489 DOI: 10.1016/j.ymgmr.2020.100615] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2020] [Revised: 06/05/2020] [Accepted: 06/06/2020] [Indexed: 11/27/2022] Open
Abstract
Peroxisomal biogenesis disorders (PBD) are rare autosomal recessive disorders with various degrees of severity caused by hypomorphic mutations in 13 different peroxin (PEX) genes. In this study, we report the clinical and molecular characterization of a 9-years-old female presenting an apparently isolated pre-lingual sensorineural hearing loss (SNHL) and early onset Retinitis Pigmentosa (RP) that may clinically overlap with Usher syndrome. Genetic testing by clinical exome sequencing identified two variants in PEX1: the missense variant c.274G > C; p.(Val92Leu) that was already reported in a PBD patient, and the variant c.2140_2145dup; p.(Ser714_Gln715dup) which is a novel, non-frameshift variant, absent in control databases. On the basis of the molecular analysis, a thorough clinical examination revealed nail and dental abnormalities, a mild cognitive impairment, learning disabilities and poor feeding, apart from the retinal and audiological features initially identified. The clinical and molecular findings led us to the diagnosis of a mild form of PBD. This study further emphasizes that mild forms of PBD can be a differential diagnosis of Usher syndrome and suggests that patients with mild cognitive impairment associated to visual and hearing loss should perform a comprehensive mutation screening that includes PEX genes.
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Key Words
- ABR, Auditory Brainstem Responses
- BCVA, Best Corrected Visual Acuity
- CDI, Children’s Depression Inventory
- ERG, full-field electroretinogram
- Enamel defects
- FAF, color fundus and fundus autofluorescence
- GVF, Goldmann Visual Field
- HS, Heimler syndrome
- Mild Zellweger syndrome
- OCT, optical coherence tomography
- PBD, Peroxisomal biogenesis disorders
- PEX genes
- PEX, peroxin
- PTA, Pure Tone Average
- Peroxisomal biogenesis disorders
- RP, retinitis pigmentosa
- Retinitis pigmentosa
- SNHL, sensorineural hearing loss
- Sensorineural hearing loss
- TEOAE, Transient-Evoked Otoacustic Emission
- VLCFA, Very Long Chain Fatty Acid
- WISC-IV, Wechsler Intelligence Scale for Children (4th Edition)
- ZS, Zellweger Syndrome
- ZSD, Zellweger spectrum disorder
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Affiliation(s)
- Maria Rosaria Barillari
- Division of Phoniatrics and Audiology, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 4, 80138 Naples, Italy
| | - Marianthi Karali
- Telethon Institute of Genetics and Medicine, Pozzuoli, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138 Naples, Italy
| | - Valentina Di Iorio
- Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania Luigi Vanvitelli, Via Pansini 5, 80131 Naples, Italy
| | - Maria Contaldo
- Dental Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania “Luigi Vanvitelli”, Via L. De Crecchio 6, 80138 Naples, Italy
| | - Vincenzo Piccolo
- Pediatric Dermatology, Dermatology Unit, University of Campania Luigi Vanvitelli, Via Pansini 5, 80131 Naples, Italy
| | - Maria Esposito
- Clinic of Child and Adolescent Neuropsychiatry, Department of Mental Health, Physical and Preventive Medicine, University of Campania "Luigi Vanvitelli", Via Pansini 5, 80131 Naples, Italy
| | - Giuseppe Costa
- Division of Phoniatrics and Audiology, Department of Mental and Physical Health and Preventive Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 4, 80138 Naples, Italy
| | - Giuseppe Argenziano
- Pediatric Dermatology, Dermatology Unit, University of Campania Luigi Vanvitelli, Via Pansini 5, 80131 Naples, Italy
| | - Rosario Serpico
- Dental Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania “Luigi Vanvitelli”, Via L. De Crecchio 6, 80138 Naples, Italy
| | - Marco Carotenuto
- Clinic of Child and Adolescent Neuropsychiatry, Department of Mental Health, Physical and Preventive Medicine, University of Campania "Luigi Vanvitelli", Via Pansini 5, 80131 Naples, Italy
| | - Gerarda Cappuccio
- Telethon Institute of Genetics and Medicine, Pozzuoli, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
- Department of Translational Medicine, Section of Paediatrics, Federico II University, Via Pansini 5, 80131 Naples, Italy
| | - Sandro Banfi
- Telethon Institute of Genetics and Medicine, Pozzuoli, Via Campi Flegrei 34, 80078 Pozzuoli, Italy
- Department of Precision Medicine, University of Campania "Luigi Vanvitelli", Via L. De Crecchio 7, 80138 Naples, Italy
| | - Paolo Melillo
- Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania Luigi Vanvitelli, Via Pansini 5, 80131 Naples, Italy
| | - Francesca Simonelli
- Eye Clinic, Multidisciplinary Department of Medical, Surgical and Dental Sciences, University of Campania Luigi Vanvitelli, Via Pansini 5, 80131 Naples, Italy
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Affiliation(s)
- Francesca Di Cara
- Department of Microbiology and Immunology-IWK Health Centre- Dalhousie University, Halifax (NS), Canada
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42
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Bennett K, Hjelmgren B, Piazza J. Blenderized Tube Feeding: Health Outcomes and Review of Homemade and Commercially Prepared Products. Nutr Clin Pract 2020; 35:417-431. [PMID: 32362020 DOI: 10.1002/ncp.10493] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The popularity of homemade blenderized tube feeding (HBTF) continues to increase among enteral nutrition (EN) consumers and healthcare providers alike, citing improved feeding tolerance over standard commercial enteral formulas, among other health outcomes. Within the past 5-10 years, there has been a surge in the development of commercial blenderized tube feeding (CBTF) products. CBTF products promote similar benefits from whole foods like those used in HBTF while being a nutritionally-consistent, easy to use, and shelf-stable option for EN consumers. Research is improving but is still limited for HBTF and virtually nonexistent for CBTF products. This review aims to summarize current health outcomes of HBTF, compare HBTF with CBTF, evaluate CBTF products, and provide considerations for future research and practices.
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Juarez-Navarro K, Ayala-Garcia VM, Ruiz-Baca E, Meneses-Morales I, Rios-Banuelos JL, Lopez-Rodriguez A. Assistance for Folding of Disease-Causing Plasma Membrane Proteins. Biomolecules 2020; 10:biom10050728. [PMID: 32392767 PMCID: PMC7277483 DOI: 10.3390/biom10050728] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 04/16/2020] [Accepted: 04/21/2020] [Indexed: 02/06/2023] Open
Abstract
An extensive catalog of plasma membrane (PM) protein mutations related to phenotypic diseases is associated with incorrect protein folding and/or localization. These impairments, in addition to dysfunction, frequently promote protein aggregation, which can be detrimental to cells. Here, we review PM protein processing, from protein synthesis in the endoplasmic reticulum to delivery to the PM, stressing the main repercussions of processing failures and their physiological consequences in pathologies, and we summarize the recent proposed therapeutic strategies to rescue misassembled proteins through different types of chaperones and/or small molecule drugs that safeguard protein quality control and regulate proteostasis.
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Autophagy as a Cellular Stress Response Mechanism in the Nervous System. J Mol Biol 2020; 432:2560-2588. [PMID: 31962122 DOI: 10.1016/j.jmb.2020.01.017] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2019] [Revised: 12/11/2019] [Accepted: 01/10/2020] [Indexed: 12/13/2022]
Abstract
Cells of an organism face with various types of insults during their lifetime. Exposure to toxins, metabolic problems, ischaemia/reperfusion, physical trauma, genetic diseases, neurodegenerative diseases are among the conditions that trigger cellular stress responses. In this context, autophagy is one of the mechanisms that supports cell survival under stressful conditions. Autophagic vesicle engulfs the cargo and transports it to lysosome for degradation and turnover. As such, autophagy eliminates abnormal proteins, clears damaged organelles, limits oxidative stress and helps to improve metabolic balance. Nervous system cells and particularly postmitotic neurons are highly sensitive to a spectrum of insults, and autophagy emerges as one of the key stress response mechanism, ensuring health and survival of these vulnerable cell types. In this review, we will overview mechanisms through which cells cope with stress, and how these stress responses regulate autophagy, with a special focus on the nervous system.
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45
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Cifuentes Y, Arteaga C. Dysmorphic features in a newborn with neurological, liver and kidney involvement by defective peroxisomal biogenesis. Case report. CASE REPORTS 2020. [DOI: 10.15446/cr.v6n1.78747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Introduction: Inborn errors of metabolism have significant morbidity and mortality rates in the neonatal period. One of these disorders is defective peroxisomal biogenesis, which causes complex and severe clinical pictures because peroxisomes are present in all nucleated cells of mammals.Case presentation: This is the case of a newborn with dysmorphic features who had seizures at birth and presented with neurological, liver, kidney and heart involvement during her 20 days of life. Necropsy confirmed liver and kidney involvement, which, together with family history of death of a sibling and a cousin, led to suspect a peroxisomal disease that was confirmed by the biochemical alterations observed.Discussion: Dysmorphism and seizures at birth may be an expression of a metabolic disease. The findings of the physical examination and the demonstration of liver, kidney and heart involvement are consistent with the initial description of Zellweger syndrome; the biochemical alterations are conclusive.Conclusions: It is necessary to define if dysmorphism is an isolated finding or if there is involvement of other organ(s) or system(s) to establish a suitable diagnosis of peroxisome biogenesis. Inborn errors of metabolism should be included in the diagnosis of dysmorphic newborns when several organs are involved, since their identification enables genetic counseling.
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Cheillan D. Zellweger Syndrome Disorders: From Severe Neonatal Disease to Atypical Adult Presentation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1299:71-80. [PMID: 33417208 DOI: 10.1007/978-3-030-60204-8_6] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Zellweger syndrome disorders (ZSD) is the principal group of peroxisomal disorders characterized by a defect of peroxisome biogenesis due to mutations in one of the 13 PEX genes. The clinical spectrum is very large with a continuum from antenatal forms to adult presentation. Whereas biochemical profile in body fluids is classically used for their diagnosis, the revolution of high-throughput sequencing has extended the knowledge about these disorders. The aim of this review is to offer a large panorama on molecular basis, clinical presentation and treatment of ZSD, and to update the diagnosis strategy of these disorders in the era of next-generation sequencing (NGS).
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Affiliation(s)
- David Cheillan
- Inserm U1060 - CarMeN Laboratory, Lyon University, Pierre-Bénite, France.
- Service Biochimie et Biologie Moléculaire Grand Est - Centre de Biologie Est, Hospices Civils de Lyon, Bron, France.
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47
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Yu HL, Shen Y, Sun YM, Zhang Y. Two novel mutations of PEX6 in one Chinese Zellweger spectrum disorder and their clinical characteristics. ANNALS OF TRANSLATIONAL MEDICINE 2019; 7:368. [PMID: 31555682 DOI: 10.21037/atm.2019.06.42] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Background Zellweger spectrum disorder (ZSD) is an autosomal recessive peroxisome biogenesis disorder (PBD) caused by bi-allelic mutations in any of the 13 PEX family genes. Methods We reported a Chinese PBD-ZSD patient with compound heterozygous mutations of PEX6 detected by target sequencing and Sanger sequencing. The clinical materials were collected. In silico analysis were used to evaluate the pathogenicity of the two mutations. An updated review summarized the genotype-phenotype correlation of PBD patients with PEX6 mutations. Results The patient was diagnosed as PBD-ZSD and displayed retinitis pigmentosa, bilateral sensorineural hearing loss, hypotonia, developmental delay, ovarian and enamel dysplasia. Elevated very long chain fatty acids were shown and a pattern of leukodystrophy was displayed through MRI. The two mutations were novel with p.Cys358* and p.Leu83Pro, both classified as pathogenic according to American College of Medical Genetics and Genomics guideline. Phenotype-genotype correlations were shown in the reported patients with PBD-ZSD continuum. Conclusions we reported the first Chinese PBD-ZSD patient with 2 novel mutations in PEX6. Target sequencing and VLFAC were helpful in diagnosis.
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Affiliation(s)
- Hui-Ling Yu
- Department & Institute of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yan Shen
- Department & Institute of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yi-Min Sun
- Department & Institute of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Yue Zhang
- Department & Institute of Neurology, Huashan Hospital, Fudan University, Shanghai 200040, China
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Zhu Z, Chen J, Wang G, Elsherbini A, Zhong L, Jiang X, Qin H, Tripathi P, Zhi W, Spassieva SD, Morris AJ, Bieberich E. Ceramide regulates interaction of Hsd17b4 with Pex5 and function of peroxisomes. Biochim Biophys Acta Mol Cell Biol Lipids 2019; 1864:1514-1524. [PMID: 31176039 DOI: 10.1016/j.bbalip.2019.05.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 05/23/2019] [Accepted: 05/30/2019] [Indexed: 12/17/2022]
Abstract
The sphingolipid ceramide regulates beta-oxidation of medium and long chain fatty acids in mitochondria. It is not known whether it also regulates oxidation of very long chain fatty acids (VLCFAs) in peroxisomes. Using affinity chromatography, co-immunoprecipitation, and proximity ligation assays we discovered that ceramide interacts with Hsd17b4, an enzyme critical for peroxisomal VLCFA oxidation and docosahexaenoic acid (DHA) generation. Immunocytochemistry showed that Hsd17b4 is distributed to ceramide-enriched mitochondria-associated membranes (CEMAMs). Molecular docking and in vitro mutagenesis experiments showed that ceramide binds to the sterol carrier protein 2-like domain in Hsd17b4 adjacent to peroxisome targeting signal 1 (PTS1), the C-terminal signal for interaction with peroxisomal biogenesis factor 5 (Pex5), a peroxin mediating transport of Hsd17b4 into peroxisomes. Inhibition of ceramide biosynthesis induced translocation of Hsd17b4 from CEMAMs to peroxisomes, interaction of Hsd17b4 with Pex5, and upregulation of DHA. This data indicates a novel role of ceramide as a molecular switch regulating interaction of Hsd17b4 with Pex5 and peroxisomal function.
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Affiliation(s)
- Zhihui Zhu
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Jianzhong Chen
- Division of Cardiovascular Medicine, The Gill Heart and Vascular Institute, University of Kentucky, Lexington, KY, United States of America
| | - Guanghu Wang
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Ahmed Elsherbini
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Liansheng Zhong
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America; School of Life Science, China Medical University, Shenyang, PR China
| | - Xue Jiang
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America; Department of Rehabilitation, ShengJing Hospital of China Medical University, Shenyang, PR China
| | - Haiyan Qin
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Priyanka Tripathi
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Wenbo Zhi
- Center for Biotechnology and Genomic Medicine, Medical College of Georgia, Augusta University, Augusta, GA. United States of America
| | - Stefka D Spassieva
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America
| | - Andrew J Morris
- Division of Cardiovascular Medicine, The Gill Heart and Vascular Institute, University of Kentucky, Lexington, KY, United States of America; Lexington Veteran Affairs Medical Center, Lexington, KY, United States of America
| | - Erhard Bieberich
- Department of Physiology, University of Kentucky, Lexington, KY, United States of America.
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Riccio V, McQuibban GA, Kim PK. USP30: protector of peroxisomes and mitochondria. Mol Cell Oncol 2019; 6:1600350. [PMID: 31131315 PMCID: PMC6512945 DOI: 10.1080/23723556.2019.1600350] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 03/19/2019] [Accepted: 03/25/2019] [Indexed: 01/02/2023]
Abstract
In our recent publication, we describe a mechanism by which peroxisomes are protected from degradation by autophagy under basal conditions. Taking a page from mitophagy, peroxisomes also recruit the mitochondria deubiquitinating enzyme USP30 to counter the action of PEX2, the peroxisomal E3 ubiquitin ligase to regulate pexophagy.
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Affiliation(s)
- Victoria Riccio
- Biochemistry Department, University of Toronto, Toronto, Canada.,Cell Biology Department, Hospital for Sick Children, Toronto, Canada
| | | | - Peter Kijun Kim
- Biochemistry Department, University of Toronto, Toronto, Canada.,Cell Biology Department, Hospital for Sick Children, Toronto, Canada
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Romano FB, Blok NB, Rapoport TA. Peroxisome protein import recapitulated in Xenopus egg extracts. J Cell Biol 2019; 218:2021-2034. [PMID: 30971414 PMCID: PMC6548129 DOI: 10.1083/jcb.201901152] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Revised: 03/17/2019] [Accepted: 03/28/2019] [Indexed: 12/14/2022] Open
Abstract
Peroxisomes import proteins with a C-terminal SKL sequence by a poorly understood mechanism. Romano et al. use Xenopus egg extracts to study peroxisome import in vitro. The novel assay recapitulates import in vivo and provides mechanistic insights. Peroxisomes import their luminal proteins from the cytosol. Most substrates contain a C-terminal Ser-Lys-Leu (SKL) sequence that is recognized by the receptor Pex5. Pex5 binds to peroxisomes via a docking complex containing Pex14, and recycles back into the cytosol following its mono-ubiquitination at a conserved Cys residue. The mechanism of peroxisome protein import remains incompletely understood. Here, we developed an in vitro import system based on Xenopus egg extracts. Import is dependent on the SKL motif in the substrate and on the presence of Pex5 and Pex14, and is sustained by ATP hydrolysis. A protein lacking an SKL sequence can be coimported, providing strong evidence for import of a folded protein. The conserved cysteine in Pex5 is not essential for import or to clear import sites for subsequent rounds of translocation. This new in vitro assay will be useful for further dissecting the mechanism of peroxisome protein import.
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Affiliation(s)
- Fabian B Romano
- Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, Boston, MA
| | - Neil B Blok
- Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, Boston, MA
| | - Tom A Rapoport
- Howard Hughes Medical Institute and Department of Cell Biology, Harvard Medical School, Boston, MA
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