1
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Bulthuis EP, Adjobo-Hermans MJW, de Potter B, Hoogstraten S, Wezendonk LHT, Tutakhel OAZ, Wintjes LT, van den Heuvel B, Willems PHGM, Kamsteeg EJ, Gozalbo MER, Sallevelt SCEH, Koudijs SM, Nicolai J, de Bie CI, Hoogendijk JE, Koopman WJH, Rodenburg RJ. SMDT1 variants impair EMRE-mediated mitochondrial calcium uptake in patients with muscle involvement. Biochim Biophys Acta Mol Basis Dis 2023; 1869:166808. [PMID: 37454773 DOI: 10.1016/j.bbadis.2023.166808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Revised: 06/26/2023] [Accepted: 07/10/2023] [Indexed: 07/18/2023]
Abstract
Ionic calcium (Ca2+) is a key messenger in signal transduction and its mitochondrial uptake plays an important role in cell physiology. This uptake is mediated by the mitochondrial Ca2+ uniporter (MCU), which is regulated by EMRE (essential MCU regulator) encoded by the SMDT1 (single-pass membrane protein with aspartate rich tail 1) gene. This work presents the genetic, clinical and cellular characterization of two patients harbouring SMDT1 variants and presenting with muscle problems. Analysis of patient fibroblasts and complementation experiments demonstrated that these variants lead to absence of EMRE protein, induce MCU subcomplex formation and impair mitochondrial Ca2+ uptake. However, the activity of oxidative phosphorylation enzymes, mitochondrial morphology and membrane potential, as well as routine/ATP-linked respiration were not affected. We hypothesize that the muscle-related symptoms in the SMDT1 patients result from aberrant mitochondrial Ca2+ uptake.
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Affiliation(s)
- Elianne P Bulthuis
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Merel J W Adjobo-Hermans
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Bastiaan de Potter
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Saskia Hoogstraten
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands; Human and Animal Physiology, Wageningen University & Research, 6700 AH Wageningen, the Netherlands
| | - Lisanne H T Wezendonk
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Omar A Z Tutakhel
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Liesbeth T Wintjes
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Bert van den Heuvel
- Translational Metabolic Laboratory, Department of Laboratory Medicine, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Peter H G M Willems
- Department of Biochemistry (286), Radboud Institute for Molecular Life Sciences, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Erik-Jan Kamsteeg
- Department of Human Genetics, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - M Estela Rubio Gozalbo
- Department of Pediatrics, Maastricht University Medical Centre, 6229 HX Maastricht, the Netherlands; Department of Clinical Genetics, Maastricht University Medical Centre, 6229 HX Maastricht, the Netherlands
| | - Suzanne C E H Sallevelt
- Department of Clinical Genetics, Maastricht University Medical Centre, 6229 HX Maastricht, the Netherlands
| | - Suzanne M Koudijs
- Department of Neurology, Maastricht University Medical Centre, 6229 HX Maastricht, the Netherlands
| | - Joost Nicolai
- Department of Neurology, Maastricht University Medical Centre, 6229 HX Maastricht, the Netherlands
| | - Charlotte I de Bie
- Department of Genetics, University Medical Centre Utrecht, 3508 AB Utrecht, the Netherlands
| | - Jessica E Hoogendijk
- Rudolf Magnus Institute of Neuroscience, University Medical Centre Utrecht, 3584 CG Utrecht, the Netherlands
| | - Werner J H Koopman
- Human and Animal Physiology, Wageningen University & Research, 6700 AH Wageningen, the Netherlands; Department of Pediatrics, Amalia Children's Hospital, Radboud Center for Mitochondrial Medicine, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, 6500 HB Nijmegen, the Netherlands.
| | - Richard J Rodenburg
- Department of Pediatrics, Amalia Children's Hospital, Radboud Center for Mitochondrial Medicine, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, 6500 HB Nijmegen, the Netherlands.
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2
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Veys K, Zadora W, Hohenfellner K, Bockenhauer D, Janssen MCH, Niaudet P, Servais A, Topaloglu R, Besouw M, Novo R, Haffner D, Kanzelmeyer N, Pape L, Wühl E, Harms E, Awan A, Sikora P, Ariceta G, van den Heuvel B, Levtchenko E. Outcome of infantile nephropathic cystinosis depends on early intervention, not genotype: A multicenter sibling cohort study. J Inherit Metab Dis 2023; 46:43-54. [PMID: 36117148 DOI: 10.1002/jimd.12562] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/01/2022] [Accepted: 09/16/2022] [Indexed: 01/19/2023]
Abstract
Infantile nephropathic cystinosis (INC) is an inheritable lysosomal storage disorder characterized by lysosomal cystine accumulation, progressive kidney disease, and multiple extrarenal complications (ERCs). Cysteamine postpones the onset of end-stage kidney disease (ESKD) and reduces the incidence of ERCs; however, cysteamine is generally initiated upon establishment of the renal Fanconi syndrome (FS) and partial loss of kidney function, whereas data on long-term effects of cysteamine administered from neonatal age are lacking. An international multicenter retrospective cohort study of siblings with INC was set up to investigate the outcome in relation to age at initiation of cysteamine versus CTNS genotype, with attention to patients treated with cysteamine from neonatal age. None of the siblings treated from neonatal age (n = 9; age 10 ± 6 years) had reached ESKD, while 22% of their index counterparts (n = 9; age 14 ± 5 years) had commenced renal replacement therapy. Siblings treated with cysteamine from the onset of symptoms at a younger age compared with their index counterparts, reached ESKD at a significant older age (13 ± 3 vs. 10 ± 3 years, p = 0.002). In contrast, no significant difference in ERCs was observed between sibling and index patients, independently from the age at initiation of cysteamine. The CTNS genotype had no impact on the overall outcome in this cohort. In INC, presymptomatic treatment with cysteamine results in a better renal outcome in comparison to treatment initiated from the onset of symptoms. This justifies including cystinosis into newborn screening programs. SYNOPSIS: In infantile nephropathic cystinosis, presymptomatic treatment with cysteamine improves the renal outcome which justifies the inclusion of cystinosis into newborn screening programs.
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Affiliation(s)
- Koenraad Veys
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
- Department of Development & Regeneration, Laboratory of Pediatric Nephrology, KU Leuven, Leuven, Belgium
| | - Ward Zadora
- Department of Internal Medicine, University Hospitals Leuven, Leuven, Belgium
| | | | - Detlef Bockenhauer
- Department of Pediatric Nephrology, Great Ormond Street Hospital for Sick Children NHS Foundation Trust (GOSH) and Department of Renal Medicine, University College London, London, UK
| | - Mirian C H Janssen
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Patrick Niaudet
- Department of Pediatric Nephrology, Hôpital Necker-Enfants Malades, Paris, France
| | - Aude Servais
- Department of Adult Nephrology and Transplantation, Hôpital Necker, Paris, France
| | - Rezan Topaloglu
- Department of Pediatric Nephrology, Hacettepe University School of Medicine, Ankara, Turkey
| | - Martine Besouw
- Department of Pediatric Nephrology, University of Groningen, Groningen, The Netherlands
| | - Robert Novo
- Pediatric Nephrology, Hôpital Jeanne de Flandre, University Hospital Lille, Lille, France
| | - Dieter Haffner
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Hannover, Germany
| | - Nele Kanzelmeyer
- Department of Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School, Hannover, Germany
| | - Lars Pape
- Department of Pediatrics, University Hospital Essen, Essen, Germany
| | - Elke Wühl
- Division of Pediatric Nephrology, Center for Pediatrics and Adolescent Medicine, Heidelberg University Hospital, Heidelberg, Germany
| | - Erik Harms
- Children's University Hospital Münster, Münster, Germany
| | - Atif Awan
- Paediatric Nephrology and Transplantation, Temple Street Children's University Hospital, Dublin, Ireland
| | - Przemyslaw Sikora
- Department of Pediatric Nephrology, Medical University of Lublin, Lublin, Poland
| | - Gema Ariceta
- Department of Pediatric Nephrology, University Hospital Vall d'Hebron, Barcelona, Spain
| | - Bert van den Heuvel
- Department of Development & Regeneration, Laboratory of Pediatric Nephrology, KU Leuven, Leuven, Belgium
| | - Elena Levtchenko
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
- Department of Development & Regeneration, Laboratory of Pediatric Nephrology, KU Leuven, Leuven, Belgium
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3
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Veys KRP, Elmonem MA, Dhaenens F, Van Dyck M, Janssen MMCH, Cornelissen EAM, Hohenfellner K, Reda A, Quatresooz P, van den Heuvel B, Boone MALM, Levtchenko E. Enhanced Intrinsic Skin Aging in Nephropathic Cystinosis Assessed by High-Definition Optical Coherence Tomography. J Invest Dermatol 2019; 139:2242-2245.e5. [PMID: 31022388 DOI: 10.1016/j.jid.2019.03.1153] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 03/04/2019] [Accepted: 03/27/2019] [Indexed: 10/27/2022]
Affiliation(s)
- Koenraad R P Veys
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium; Department of Development & Regeneration, KU Leuven, Leuven, Belgium.
| | - Mohamed A Elmonem
- Department of Development & Regeneration, KU Leuven, Leuven, Belgium; Department of Clinical and Chemical Pathology, Faculty of Medicine, Cairo University, Cairo, Egypt
| | | | - Maria Van Dyck
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium
| | - Mirian M C H Janssen
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | | | | | - Ahmed Reda
- Department of Development & Regeneration, KU Leuven, Leuven, Belgium
| | - Pascale Quatresooz
- Department of Pathology, Centre Hospitalier Universitaire de Liège, Liège, Belgium
| | - Bert van den Heuvel
- Department of Development & Regeneration, KU Leuven, Leuven, Belgium; Department of Pediatrics, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Marc A L M Boone
- Department of Dermatology, Université Libre de Bruxelles, Brussels, Belgium
| | - Elena Levtchenko
- Department of Pediatrics, University Hospitals Leuven, Leuven, Belgium; Department of Development & Regeneration, KU Leuven, Leuven, Belgium
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4
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Michels M, Okroj M, Blom A, van Kraaij S, van de Kar N, Volokhina E, van den Heuvel B. Detection of convertase-stabilizing factors in patients with complement-mediated renal diseases: Translation to a diagnostic approach. Mol Immunol 2017. [DOI: 10.1016/j.molimm.2017.06.156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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5
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Knops N, Ramazani Y, van den Heuvel B, Levtchenko E, Kuypers D. SP781THE EFFECT OF IN VITRO TACROLIMUS EXPOSURE AND PHARMACOGENETIC VARIATION ON MULTILEVEL CYP3A5, ABCB1 EXPRESSION AND CTGF PRODUCTION IN HUMAN PROXIMAL TUBULE CELLS. Nephrol Dial Transplant 2017. [DOI: 10.1093/ndt/gfx158.sp781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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6
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Osborne AJ, de Cordoba SR, Fremeaux-Bacchi V, Noris M, Smith RJ, van den Heuvel B, Goodship TH, Perkins SJ. Database of Complement Gene Variants: A comprehensive database providing insights on function, structure and allele frequency for genetic variants identified in complement-mediated diseases. Immunobiology 2016. [DOI: 10.1016/j.imbio.2016.06.221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Eneman B, Levtchenko E, van den Heuvel B, Van Geet C, Freson K. Platelet abnormalities in nephrotic syndrome. Pediatr Nephrol 2016; 31:1267-79. [PMID: 26267676 DOI: 10.1007/s00467-015-3173-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 07/03/2015] [Accepted: 07/03/2015] [Indexed: 01/08/2023]
Abstract
Nephrotic syndrome (NS) is a common kidney disease associated with a significantly increased risk of thrombotic events. Alterations in plasma levels of pro- and anti-coagulant factors are involved in the pathophysiology of venous thrombosis in NS. However, the fact that the risk of both venous and arterial thrombosis is elevated in NS points to an additional role for blood platelets. Increased platelet counts and platelet hyperactivity have been observed in nephrotic children. Platelet hyperaggregability, increased release of active substances, and elevated surface expression of activation-dependent platelet markers have been documented. The mechanisms underlying those platelet alterations are multifactorial and are probably due to changes in plasma levels of platelet-interfering proteins and lipid changes, as a consequence of nephrosis. The causal relationship between platelet alterations seen in NS and the occurrence of thromboembolic phenomena remains unclear. Moreover, the efficiency of prophylactic treatment using antiplatelet agents for the prevention of thrombotic complications in nephrotic patients is also unknown. Thus, antiplatelet medication is currently not generally recommended for routine prophylactic therapy.
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Affiliation(s)
- Benedicte Eneman
- Pediatric Nephrology, Department of Pediatrics, University hospital of Leuven, Leuven, Belgium.
- Laboratory of Pediatric Nephrology, Department of Development & Regeneration, KU Leuven, Leuven, Belgium.
| | - Elena Levtchenko
- Pediatric Nephrology, Department of Pediatrics, University hospital of Leuven, Leuven, Belgium
- Laboratory of Pediatric Nephrology, Department of Development & Regeneration, KU Leuven, Leuven, Belgium
| | - Bert van den Heuvel
- Laboratory of Pediatric Nephrology, Department of Development & Regeneration, KU Leuven, Leuven, Belgium
| | - Chris Van Geet
- Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium
| | - Kathleen Freson
- Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, University of Leuven, Leuven, Belgium
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8
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Emirova K, Volokhina E, Tolstova E, van den Heuvel B. Recovery of renal function after long-term dialysis and resolution of cardiomyopathy in a patient with aHUS receiving eculizumab. BMJ Case Rep 2016; 2016:bcr-2015-213928. [PMID: 26880823 DOI: 10.1136/bcr-2015-213928] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
We present the case of a 18-month-old girl with renal and cardiac manifestations of atypical haemolytic uraemic syndrome (aHUS), and a novel complement factor H mutation. Transient haematological remission was achieved with intensive plasmapheresis, but cardiac function deteriorated and renal function was not restored. Initiation of eculizumab after 6 months of dialysis significantly improved organ function. At 43 months after presentation, haematological values had normalised and cardiac function had improved. Dialysis was discontinued after 10 months (the longest reported time in a patient with aHUS) and the estimated glomerular filtration rate had recovered to 70 mL/min/1.73 m(2). In conclusion, treatment of aHUS with eculizumab, even after long-term dialysis, can significantly improve renal function. Discontinuation of dialysis and resolution of cardiac function has implications on the potential recovery and treatment choice of such patients. Earlier initiation of eculizumab, however, might have prevented the irreversible renal sclerosis and cardiac dysfunction.
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Affiliation(s)
- Khadizha Emirova
- The AI Evdokimov Moscow State University of Medicine and Dentistry, Moscow, Russian Federation
| | - Elena Volokhina
- Department of Paediatric Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Evgenia Tolstova
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Bert van den Heuvel
- Department of Paediatric Nephrology, Radboud University Medical Center, Nijmegen, The Netherlands Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
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9
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Van Hoeve K, Vandermeulen C, van den Heuvel B, Levtchenko E, Van Ranst M, Mekahli D. SP899OCCURRENCE OF ATYPICAL HEMOLYTIC UREMIC SYNDROME FOLLOWING INFLUENZA B INFECTION. Nephrol Dial Transplant 2015. [DOI: 10.1093/ndt/gfv203.37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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10
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Di Mise A, Tamma G, Ranieri M, Svelto M, Heuvel BVD, Levtchenko EN, Valenti G. Conditionally immortalized human proximal tubular epithelial cells isolated from the urine of a healthy subject express functional calcium-sensing receptor. Am J Physiol Renal Physiol 2015; 308:F1200-6. [PMID: 25656364 DOI: 10.1152/ajprenal.00352.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Accepted: 02/03/2015] [Indexed: 02/08/2023] Open
Abstract
The calcium-sensing receptor (CaSR) is a G protein-coupled receptor, which plays an essential role in regulating Ca(2+) homeostasis. Here we show that conditionally immortalized proximal tubular epithelial cell line (ciPTEC) obtained by immortalizing and subcloning cells exfoliated in the urine of a healthy subject expresses functional endogenous CaSR. Immunolocalization studies of polarized ciPTEC revealed the apical localization of the receptor. By Western blotting of ciPTEC lysates, both monomeric and dimeric forms of CaSR at 130 and ∼250 kDa, respectively, were detected. Functional studies indicated that both external calcium and the positive CaSR allosteric modulator, NPS-R568, induced a significant increase in cytosolic calcium, proving a high sensitivity of the endogenous receptor to its agonists. Calcium depletion from the endoplasmic reticulum using cyclopiazonic acid abolished the increase in cytosolic calcium elicited by NPS-R568, confirming calcium exit from intracellular stores. Activation of CaSR by NPS-R significantly reduced the increase in cAMP elicited by forskolin (FK), a direct activator of adenylate cyclase, further confirming the functional expression of the receptor in this cell line. CaSR expressed in ciPTEC was found to interact with Gq as a downstream effector, which in turn can cause release of calcium from intracellular stores via phospholipase C activation. We conclude that human proximal tubular ciPTEC express functional CaSR and respond to its activation with a release of calcium from intracellular stores. These cell lines represent a valuable tool for research into the disorder associated with gain or loss of function of the CaSR by producing cell lines from patients.
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Affiliation(s)
- Annarita Di Mise
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Aldo Moro, Italy
| | - Grazia Tamma
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Aldo Moro, Italy
| | - Marianna Ranieri
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Aldo Moro, Italy
| | - Maria Svelto
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Aldo Moro, Italy; Center of Excellence in Comparative Genomics(CEGBA), Bari, Italy
| | - Bert van den Heuvel
- Department of Pediatric Nephrology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands; and
| | - Elena N Levtchenko
- Department of Pediatric Nephrology, University Hospital Gasthuisberg, Leuven, Belgium
| | - Giovanna Valenti
- Department of Biosciences, Biotechnologies and Biopharmaceutics, University of Bari, Aldo Moro, Italy; Center of Excellence in Comparative Genomics(CEGBA), Bari, Italy;
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11
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Gardeitchik T, Mohamed M, Fischer B, Lammens M, Lefeber D, Lace B, Parker M, Kim KJ, Lim BC, Häberle J, Garavelli L, Jagadeesh S, Kariminejad A, Guerra D, Leão M, Keski-Filppula R, Brunner H, Nijtmans L, van den Heuvel B, Wevers R, Kornak U, Morava E. Clinical and biochemical features guiding the diagnostics in neurometabolic cutis laxa. Eur J Hum Genet 2014; 22:888-95. [PMID: 23963297 PMCID: PMC4060105 DOI: 10.1038/ejhg.2013.154] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2012] [Revised: 06/11/2013] [Accepted: 06/12/2013] [Indexed: 01/01/2023] Open
Abstract
Patients with cutis laxa (CL) have wrinkled, sagging skin with decreased elasticity. Skin symptoms are associated with variable systemic involvement. The most common, genetically highly heterogeneous form of autosomal recessive CL, ARCL2, is frequently associated with variable metabolic and neurological symptoms. Progeroid symptoms, dysmorphic features, hypotonia and psychomotor retardation are highly overlapping in the early phase of these disorders. This makes the genetic diagnosis often challenging. In search for discriminatory symptoms, we prospectively evaluated clinical, neurologic, metabolic and genetic features in our patient cohort referred for suspected ARCL. From a cohort of 26 children, we confirmed mutations in genes associated with ARCL in 16 children (14 probands), including 12 novel mutations. Abnormal glycosylation and gyration abnormalities were mostly, but not always associated with ATP6V0A2 mutations. Epilepsy was most common in ATP6V0A2 defects. Corpus callosum dysgenesis was associated with PYCR1 and ALDH18A1 mutations. Dystonic posturing was discriminatory for PYCR1 and ALDH18A1 defects. Metabolic markers of mitochondrial dysfunction were found in one patient with PYCR1 mutations. So far unreported white matter abnormalities were found associated with GORAB and RIN2 mutations. We describe a large cohort of CL patients with neurologic involvement. Migration defects and corpus callosum hypoplasia were not always diagnostic for a specific genetic defect in CL. All patients with ATP6V0A2 defects had abnormal glycosylation. To conclude, central nervous system and metabolic abnormalities were discriminatory in this genetically heterogeneous group, although not always diagnostic for a certain genetic defect in CL.
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Affiliation(s)
- Thatjana Gardeitchik
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Miski Mohamed
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Björn Fischer
- Institute of Medical Genetics and Human Genetics, Charité Universitätsmedizin, Berlin, Germany
| | - Martin Lammens
- Department of Pathology, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Dirk Lefeber
- Department of Neurology, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Baiba Lace
- Medical Genetics Clinic, Children's Clinical University Hospital, Riga, Latvia
| | - Michael Parker
- Sheffield Clinical Genetics Service, Sheffield Children's Hospital, Sheffield, UK
| | - Ki-Joong Kim
- Department of Pediatrics, Seoul National University Hospital, Seoul, South Korea
| | - Bing C Lim
- Department of Pediatrics, Seoul National University Hospital, Seoul, South Korea
| | - Johannes Häberle
- Department of Pediatrics, University Children's Hospital, Zürich, Switzerland
| | - Livia Garavelli
- Clinical Genetics Unit, Obstetric and Pediatric Department, Santa Maria Nuova Hospital IRCCS, Reggio Emilia, Italy
| | | | | | - Deanna Guerra
- Department of Biomedical Sciences, University of Modena and Reggio Emilia, Modena, Italy
| | - Michel Leão
- Pediatric Neurology Unit and Neurogenetics Unit, Hospital S João, Porto, Portugal
| | | | - Han Brunner
- Department of Human Genetics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Leo Nijtmans
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Bert van den Heuvel
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Laboratory for Genetic Endocrine and Metabolic Diseases, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Ron Wevers
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Laboratory for Genetic Endocrine and Metabolic Diseases, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
| | - Uwe Kornak
- Institute of Medical Genetics and Human Genetics, Charité Universitätsmedizin, Berlin, Germany
- FG Development and Disease, Max Planck Institute for Molecular Genetics, Berlin, Germany
| | - Eva Morava
- Department of Pediatrics, Institute for Metabolic and Genetic Disease, Radboud University Medical Centre, Nijmegen, The Netherlands
- Hayward Genetics Center, Tulane University Medical Center, New Orleans, LA, USA
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12
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Neveling K, Feenstra I, Gilissen C, Hoefsloot LH, Kamsteeg EJ, Mensenkamp AR, Rodenburg RJT, Yntema HG, Spruijt L, Vermeer S, Rinne T, van Gassen KL, Bodmer D, Lugtenberg D, de Reuver R, Buijsman W, Derks RC, Wieskamp N, van den Heuvel B, Ligtenberg MJL, Kremer H, Koolen DA, van de Warrenburg BPC, Cremers FPM, Marcelis CLM, Smeitink JAM, Wortmann SB, van Zelst-Stams WAG, Veltman JA, Brunner HG, Scheffer H, Nelen MR. A post-hoc comparison of the utility of sanger sequencing and exome sequencing for the diagnosis of heterogeneous diseases. Hum Mutat 2013; 34:1721-6. [PMID: 24123792 DOI: 10.1002/humu.22450] [Citation(s) in RCA: 259] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 09/04/2013] [Indexed: 01/20/2023]
Abstract
The advent of massive parallel sequencing is rapidly changing the strategies employed for the genetic diagnosis and research of rare diseases that involve a large number of genes. So far it is not clear whether these approaches perform significantly better than conventional single gene testing as requested by clinicians. The current yield of this traditional diagnostic approach depends on a complex of factors that include gene-specific phenotype traits, and the relative frequency of the involvement of specific genes. To gauge the impact of the paradigm shift that is occurring in molecular diagnostics, we assessed traditional Sanger-based sequencing (in 2011) and exome sequencing followed by targeted bioinformatics analysis (in 2012) for five different conditions that are highly heterogeneous, and for which our center provides molecular diagnosis. We find that exome sequencing has a much higher diagnostic yield than Sanger sequencing for deafness, blindness, mitochondrial disease, and movement disorders. For microsatellite-stable colorectal cancer, this was low under both strategies. Even if all genes that could have been ordered by physicians had been tested, the larger number of genes captured by the exome would still have led to a clearly superior diagnostic yield at a fraction of the cost.
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Affiliation(s)
- Kornelia Neveling
- Department of Human Genetics, Radboud university medical center, Nijmegen, The Netherlands; Institute for Genetic and Metabolic Disease, Radboud university medical centre, Nijmegen, The Netherlands
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Knops N, Levtchenko E, van den Heuvel B, Kuypers D. From gut to kidney: transporting and metabolizing calcineurin-inhibitors in solid organ transplantation. Int J Pharm 2013; 452:14-35. [PMID: 23711732 DOI: 10.1016/j.ijpharm.2013.05.033] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/08/2013] [Accepted: 05/10/2013] [Indexed: 12/14/2022]
Abstract
Since their introduction circa 35 years ago, calcineurin-inhibitors (CNI) have become the cornerstone of immunosuppressive therapy in solid organ transplantation. However, CNI's possess a narrow therapeutic index with potential severe consequences of drug under- or overexposure. This demands a meticulous policy of Therapeutic Drug Monitoring (TDM) to optimize outcome. In clinical practice optimal dosing is difficult to achieve due to important inter- and intraindividual variation in CNI pharmacokinetics. A complex and often interdependent set of factors appears relevant in determining drug exposure. These include recipient characteristics such as age, race, body composition, organ function, and food intake, but also graft-related characteristics such as: size, donor-age, and time after transplantation can be important. Fundamental (in vitro) and clinical studies have pointed out the intrinsic relation between the aforementioned variables and the functional capacity of enzymes and transporters involved in CNI metabolism, primarily located in intestine, liver and kidney. Commonly occurring polymorphisms in genes responsible for CNI metabolism (CYP3A4, CYP3A5, CYP3A7, PXR, POR, ABCB1 (P-gp) and possibly UGT) are able to explain an important part of interindividual variability. In particular, a highly prevalent SNP in CYP3A5 has proven to be an important determinant of CNI dose requirements and drug-dose-interactions. In addition, a discrepancy in genotype between graft and receptor has to be taken into account. Furthermore, common phenomena in solid organ transplantation such as inflammation, ischemia- reperfusion injury, graft function, co-medication, altered food intake and intestinal motility can have a differential effect on the expression enzymes and transporters involved in CNI metabolism. Notwithstanding the built-up knowledge, predicting individual CNI pharmacokinetics and dose requirements on the basis of current clinical and experimental data remains a challenge.
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Affiliation(s)
- Noël Knops
- Department of Pediatric Nephrology and Solid Organ Transplantation, University Hospitals Leuven, Belgium.
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Joost K, Rodenburg R, Piirsoo A, van den Heuvel B, Zordania R, Ounap K. A novel mutation in the SCO2 gene in a neonate with early-onset cardioencephalomyopathy. Pediatr Neurol 2010; 42:227-30. [PMID: 20159436 DOI: 10.1016/j.pediatrneurol.2009.10.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2009] [Revised: 09/08/2009] [Accepted: 10/12/2009] [Indexed: 11/25/2022]
Abstract
Mutations in the SCO2 gene [SCO cytochrome oxidase deficient homolog 2 (yeast)] causing cytochrome c oxidase deficiency have been reported in at least in 26 patients with fatal infantile cardioencephalomyopathy. Mutation 1541G > A affecting protein stability is associated with the majority of cases, and the other 11 described mutations have more serious deleterious structural consequences for the protein product. Reported here is a novel case caused by compound heterozygosity of SCO2. The child presented at the age of 3 weeks with failure-to-thrive, muscular hypotonia, hypertrophic cardiomyopathy, and lactic acidemia. Leigh syndrome was diagnosed based on magnetic resonance imaging findings. Immunohistochemical and enzymatic investigations on muscle indicated totally absent cytochrome c oxidase activity. Both parents had mild mental retardation. Sequence analysis in the patient and in his parents revealed heterozygous mutation c.418G > A in exon 2 inherited from the father and maternally inherited heterozygous insertion of 19bp at position 17 in the coding region of the SCO2 gene. Respiratory chain enzyme activity measurements indicated normal activity in both parents, although the mother's cytochrome c oxidase activity was lower. This gene may be involved in the etiology of the mother's mental retardation.
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Jonckheere AI, Hogeveen M, Nijtmans L, van den Brand M, Janssen A, Diepstra H, van den Brandt F, van den Heuvel B, Hol F, Hofste T, Kapusta L, Dillmann U, Shamdeen M, Smeitink J, Smeitink J, Rodenburg R. A novel mitochondrial ATP8 gene mutation in a patient with apical hypertrophic cardiomyopathy and neuropathy. BMJ Case Rep 2009; 2009:bcr07.2008.0504. [PMID: 21686774 PMCID: PMC3027703 DOI: 10.1136/bcr.07.2008.0504] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
To identify the biochemical and molecular genetic defect in a 16-year-old patient presenting with apical hypertrophic cardiomyopathy and neuropathy suspected for a mitochondrial disorder.Measurement of the mitochondrial energy-generating system (MEGS) capacity in muscle and enzyme analysis in muscle and fibroblasts were performed. Relevant parts of the mitochondrial DNA were analysed by sequencing.A homoplasmic nonsense mutation m.8529G→A (p.Trp55X) was found in the mitochondrial ATP8 gene in the patient's fibroblasts and muscle tissue. Reduced complex V activity was measured in the patient's fibroblasts and muscle tissue, and was confirmed in cybrid clones containing patient-derived mitochondrial DNAWe describe the first pathogenic mutation in the mitochondrial ATP8 gene, resulting in an improper assembly and reduced activity of the complex V holoenzyme.
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Affiliation(s)
- An I Jonckheere
- Geert Grooteplein 10 PO Box 9101, 6500 HB Nijmegen, Netherlands
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16
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Smeitink JAM, Elpeleg O, Antonicka H, Diepstra H, Saada A, Smits P, Sasarman F, Vriend G, Jacob-Hirsch J, Shaag A, Rechavi G, Welling B, Horst J, Rodenburg RJ, van den Heuvel B, Shoubridge EA. Distinct clinical phenotypes associated with a mutation in the mitochondrial translation elongation factor EFTs. Am J Hum Genet 2006; 79:869-77. [PMID: 17033963 PMCID: PMC1698578 DOI: 10.1086/508434] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2006] [Accepted: 08/14/2006] [Indexed: 01/06/2023] Open
Abstract
The 13 polypeptides encoded in mitochondrial DNA (mtDNA) are synthesized in the mitochondrial matrix on a dedicated protein-translation apparatus that resembles that found in prokaryotes. Here, we have investigated the genetic basis for a mitochondrial protein-synthesis defect associated with a combined oxidative phosphorylation enzyme deficiency in two patients, one of whom presented with encephalomyopathy and the other with hypertrophic cardiomyopathy. Sequencing of candidate genes revealed the same homozygous mutation (C997T) in both patients in TSFM, a gene coding for the mitochondrial translation elongation factor EFTs. EFTs functions as a guanine nucleotide exchange factor for EFTu, another translation elongation factor that brings aminoacylated transfer RNAs to the ribosomal A site as a ternary complex with guanosine triphosphate. The mutation predicts an Arg333Trp substitution at an evolutionarily conserved site in a subdomain of EFTs that interacts with EFTu. Molecular modeling showed that the substitution disrupts local subdomain structure and the dimerization interface. The steady-state levels of EFTs and EFTu in patient fibroblasts were reduced by 75% and 60%, respectively, and the amounts of assembled complexes I, IV, and V were reduced by 35%-91% compared with the amounts in controls. These phenotypes and the translation defect were rescued by retroviral expression of either EFTs or EFTu. These data clearly establish mutant EFTs as the cause of disease in these patients. The fact that the same mutation is associated with distinct clinical phenotypes suggests the presence of genetic modifiers of the mitochondrial translation apparatus.
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Affiliation(s)
- Jan A M Smeitink
- Nijmegen Centre for Mitochondrial Disorders, Department of Pediatrics, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
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Joosten SA, Sijpkens YWJ, van Ham V, Trouw LA, van der Vlag J, van den Heuvel B, van Kooten C, Paul LC. Antibody response against the glomerular basement membrane protein agrin in patients with transplant glomerulopathy. Am J Transplant 2005; 5:383-93. [PMID: 15643999 DOI: 10.1111/j.1600-6143.2005.00690.x] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Chronic allograft nephropathy (CAN) of renal allografts is still the most important cause of graft loss. A subset of these patients have transplant glomerulopathy (TGP), characterized by glomerular basement membrane (GBM) duplications, but of unknown etiology. Recently, a role for the immune system in the pathogenesis of TGP has been suggested. In 11 of 16 patients with TGP and in 3 of 16 controls with CAN in the absence of TGP we demonstrate circulating antibodies reactive with GBM isolates. The presence of anti-GBM antibodies was associated with the number of rejection episodes prior to diagnosis of TGP. Sera from the TGP patients also reacted with highly purified GBM heparan sulphate proteoglycans (HSPG). Indirect immunofluorescence with patient IgG showed a GBM-like staining pattern and colocalization with the HSPGs perlecan and especially agrin. Using patient IgG, we affinity purified the antigen and identified it as agrin. Reactivity with agrin was found in 7 of 16 (44%) of patients with TGP and in 7 of 11 (64%) patients with anti-GBM reactivity. In conclusion, we have identified a humoral response against the GBM-HSPG agrin in patients with TGP, which may play a role in the pathogenesis of TGP.
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Affiliation(s)
- Simone A Joosten
- Department of Nephrology, Leiden University Medical Center, Leiden, the Netherlands
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