1
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Platt I, Bisgin A, Kilavuz S. Ethylmalonic Encephalopathy: a literature review and two new cases of mild phenotype. Neurol Sci 2023; 44:3827-3852. [PMID: 37458841 DOI: 10.1007/s10072-023-06904-8] [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: 01/20/2023] [Accepted: 06/12/2023] [Indexed: 10/13/2023]
Abstract
BACKGROUND Ethylmalonic encephalopathy (EE) is a rare intoxication-type metabolic disorder with multisystem involvement. It is caused by mutations in ETHE1, which encodes the ETHE1 enzyme in the mitochondrial matrix that plays a key role in hydrogen sulfide (H2S) detoxification acting as a sulphur dioxygenase. RESULTS This review focuses on the clinical, metabolic, genetic and neuroradiological features of 70 reported cases, including two new cases. The common manifestations of EE are psychomotor regression, hypotonia, developmental delay, petechia, pyramidal signs, chronic diarrhoea, orthostatic acrocyanosis and failure to thrive, respectively. A significant difference was found in EMA and C4 levels (p=0.003, p=0.0236) between classical and mild phenotypes. Urinary EMA, C4 and C5 levels were found to exhibit normal values in milder cases during attack-free periods. The most common ETHE1 gene homozygous state mutations were (p.R163Q) (c.488G>A), exon 4 deletion, (p.R163W)(c.487C>T), (p.Glu44ValfsTer62)(c.131_132delAG) and (p.M1I)(c.3G>T) mutations, respectively. Fifty-two patients underwent cranial MRI. Basal ganglia signal alterations were detected in 42 cases. Of the 70 cases, eight had a mild phenotype and slow neurological progression with low levels of ethylmalonic acid (EMA) and C4 acylcarnitine. The current age of alive patients in the published articles with mild phenotype was significantly higher than the classical phenotype. (p=0.002). Reducing the accumulation and inducing detoxification of sulfide is the main long-term treatment strategy for EE, including metronidazole, N-acetylcysteine (NAC), dietary modification, liver transplantation and continuous renal replacement therapy (CRRT). CONCLUSION Measuring EMA and C4 acylcarnitine during metabolic attacks is critical to diagnosing EE, allowing for early treatment initiation to prevent further encephalopathic crises. Experience with liver transplantation, diet and CRRT, is currently limited. An early multidisciplinary approach with combination therapies is vital to prevent irreversible neurological damage.
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Affiliation(s)
| | - Atil Bisgin
- Department of Medical Genetics, Cukurova University AGENTEM (Adana Genetic Diseases Diagnosis and Treatment Center), Adana, Turkey
| | - Sebile Kilavuz
- Division of Pediatric Metabolism and Nutrition, Department of Pediatrics, Marmara University Faculty of Medicine, İstanbul, Turkey.
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2
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Gowda VK, Srinivasan VM, Jetha K, Sugumar K, Bhat M, Shivappa SK, Bhat M, Christopher R. Case Series of Ethylmalonic Encephalopathy from Southern India. J Pediatr Genet 2023; 12:213-218. [PMID: 37575639 PMCID: PMC10421674 DOI: 10.1055/s-0041-1740370] [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: 05/22/2021] [Accepted: 10/22/2021] [Indexed: 10/19/2022]
Abstract
Ethylmalonic encephalopathy is a rare neurometabolic disorder with central nervous system involvement and vasculopathy. It is presented in infancy with developmental delay, acrocyanosis, petechiae, chronic diarrhea, and early death. This was a retrospective study of confirmed cases of ethylmalonic aciduria from a tertiary care hospital over a period of 5 years from January 2015 to December 2020. Case details including analysis of clinical history, investigations, and outcomes are presented. Of six cases, male-to-female ratio was 4:2. Mean age of presentation was 35.5 months (range: 14-83 months). Consanguinity, global developmental delay, failure to thrive, skin rashes, microcephaly, hypotonia, and exaggerated deep tendon reflexes were observed in all cases. Chronic diarrhea was presented in five cases. The serum levels of C4 carnitine and urinary levels of ethylmalonic acid were increased in all cases. Magnetic resonance imaging (MRI) of the brain showed heterogenous bilateral symmetrical changes in the basal ganglia in five cases, and in one case, MRI could not be done. Genetic testing in two cases showed a homozygous variant in ETHE1 gene. Four children died, while the other two cases showed a decreased in recurrent encephalopathies and diarrhea after starting metronidazole. All children had global developmental delay, failure to thrive, skin rashes, central hypotonia, increased C4 carnitine levels in the serum, and increased ethylmalonic acid in the urine. Chronic diarrhea, acrocyanosis, and basal ganglia change in the MRI of the brain also give important clues for diagnosis. Metronidazole is useful in preventing recurrent episodes of encephalopathy.
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Affiliation(s)
- Vykuntaraju K. Gowda
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Varunvenkat M. Srinivasan
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Kapil Jetha
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Kiruthiga Sugumar
- Department of Pediatric Neurology, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Meenakshi Bhat
- Department of Genetics, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Sanjay K. Shivappa
- Department of Pediatric Medicine, Indira Gandhi Institute of Child Health, Bengaluru, Karnataka, India
| | - Maya Bhat
- Department of Neuroradiology, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India
| | - Rita Christopher
- Department of Neurochemistry, National Institute of Mental Health and Neurosciences, Bangalore, Karnataka, India
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3
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Wang G, Zhao Z, Li Y. A case report of atypical ethylmalonic encephalopathy with peripheral neuropathy. CNS Neurosci Ther 2023; 29:971-973. [PMID: 36601669 PMCID: PMC9928541 DOI: 10.1111/cns.14072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 12/07/2022] [Accepted: 12/09/2022] [Indexed: 01/06/2023] Open
Affiliation(s)
- Guan‐Qing Wang
- Department of Neurology, Shandong Provincial Qianfoshan Hospital, School of Clinical MedicineWeifang Medical UniversityWeifangChina
| | - Ze‐Yu Zhao
- Department of NeurologyThe First Affiliated Hospital of Shandong First Medical UniversityJinanChina,Shandong Institute of NeuroimmunologyJinanChina
| | - Yan‐Bin Li
- Department of NeurologyThe First Affiliated Hospital of Shandong First Medical UniversityJinanChina,Shandong Institute of NeuroimmunologyJinanChina
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4
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Cardelo Autero N, Cordón Martínez AM, Ramos-Fernández JM. Ethylmalonic encephalopathy: phenotype-genotype description and review of its management. NEUROLOGÍA (ENGLISH EDITION) 2021; 36:729-731. [PMID: 34274260 DOI: 10.1016/j.nrleng.2021.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Accepted: 01/31/2021] [Indexed: 11/25/2022] Open
Affiliation(s)
- N Cardelo Autero
- Servicio de Pediatría, Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, Spain
| | - A M Cordón Martínez
- Servicio de Pediatría (lactantes), Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, Spain
| | - J M Ramos-Fernández
- Sección de Neurología Pediátrica, Grupo IBIMA, Servicio de Pediatría, Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, Spain.
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5
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Hertzog A, Selvanathan A, Tolun AA, Parayil Sankaran B, Bhattacharya K. Purpuric, delayed child: Beyond septicaemia and into inborn errors of metabolism. J Paediatr Child Health 2021; 57:1703-1706. [PMID: 33586825 DOI: 10.1111/jpc.15365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 01/17/2021] [Indexed: 11/29/2022]
Affiliation(s)
- Ashley Hertzog
- NSW Biochemical Genetics Service, The Children's Hospital at Westmead, Sydney, New South Wales, Australia.,Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Arthavan Selvanathan
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia.,Genetic Metabolic Disorders Service, Sydney Children's Hospitals' Network, Sydney, New South Wales, Australia
| | - Adviye A Tolun
- NSW Biochemical Genetics Service, The Children's Hospital at Westmead, Sydney, New South Wales, Australia.,Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia
| | - Bindu Parayil Sankaran
- Genetic Metabolic Disorders Service, Sydney Children's Hospitals' Network, Sydney, New South Wales, Australia
| | - Kaustuv Bhattacharya
- Faculty of Medicine and Health, University of Sydney, Sydney, New South Wales, Australia.,Genetic Metabolic Disorders Service, Sydney Children's Hospitals' Network, Sydney, New South Wales, Australia
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6
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Lim J, Shayota BJ, Lay E, Elsea SH, Bekheirnia MR, Tessier MEM, Kralik SF, Rice GM, Soler-Alfonso C, Scaglia F. Acute Strokelike Presentation and Long-term Evolution of Diffusion Restriction Pattern in Ethylmalonic Encephalopathy. J Child Neurol 2021; 36:841-852. [PMID: 33900143 DOI: 10.1177/08830738211006507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Ethylmalonic encephalopathy is a rare autosomal recessive mitochondrial disorder caused by pathogenic biallelic variants in the ETHE1 gene. The phenotype of this disease has been attributed to deficiency in the mitochondrial sulfur dioxygenase leading to many downstream effects. Ethylmalonic encephalopathy classically presents with developmental regression, petechiae, acrocyanosis, and chronic diarrhea. The neurologic phenotype includes hypotonia, spastic diplegia, ataxia, and developmental delay. As more patients with this condition are described, the neurologic phenotype continues to expand. Although strokelike episodes or metabolic strokes have been studied in other mitochondrial disorders, they have not been thoroughly reported in this disorder. Herein, we describe 3 patients with ethylmalonic encephalopathy who presented clinically with strokelike episodes and strokelike abnormalities on brain magnetic resonance imaging in the setting of acute illness, and the long-term sequelae with evolution into cystic changes in one of these subjects.
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Affiliation(s)
- Jaehyung Lim
- Division of Pediatric Neurology and Developmental Neurosciences, 3989Baylor College of Medicine, Houston, TX, USA
| | - Brian J Shayota
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA.,3984Texas Children's Hospital, Houston, TX, USA
| | - Erica Lay
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA.,3984Texas Children's Hospital, Houston, TX, USA
| | - Sarah H Elsea
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA
| | - Mir Reza Bekheirnia
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA.,3984Texas Children's Hospital, Houston, TX, USA.,Renal Section, Department of Pediatrics, 3989Baylor College of Medicine, Houston, TX, USA
| | - Mary Elizabeth M Tessier
- Department of Pediatrics, Section of Pediatric Gastroenterology, Hepatology and Nutrition 3989Baylor College of Medicine Houston TX, USA
| | - Stephen F Kralik
- Department of Radiology, 3984Texas Children's Hospital, Houston, TX, USA
| | - Gregory M Rice
- Department of Pediatrics and the Waisman Center, 5232University of Wisconsin School of Medicine and Public Health, Madison, WI, USA
| | - Claudia Soler-Alfonso
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA.,3984Texas Children's Hospital, Houston, TX, USA
| | - Fernando Scaglia
- Department of Molecular and Human Genetics, 3989Baylor College of Medicine, Houston, TX, USA.,3984Texas Children's Hospital, Houston, TX, USA.,Joint 3989BCM-CUHK Center of Medical Genetics, Prince of Wales Hospital, Shatin, Hong Kong SAR
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7
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Olivieri G, Martinelli D, Longo D, Grimaldi C, Liccardo D, Di Meo I, Pietrobattista A, Sidorina A, Semeraro M, Dionisi-Vici C. Ethylmalonic encephalopathy and liver transplantation: long-term outcome of the first treated patient. Orphanet J Rare Dis 2021; 16:229. [PMID: 34011365 PMCID: PMC8136189 DOI: 10.1186/s13023-021-01867-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Accepted: 05/11/2021] [Indexed: 11/16/2022] Open
Abstract
BACKGROUND Ethylmalonic encephalopathy (EE) is a severe intoxication-type metabolic disorder with multisystem clinical features and leading to early death. In 2014, based on the promising results obtained by liver-targeted gene therapy in Ethe1-/- mouse model, we successfully attempted liver transplantation in a 9-month-old EE girl. Here we report her long-term follow-up, lasting over 6 years, with a comprehensive evaluation of clinical, instrumental and biochemical assessments. RESULTS Neurological signs initially reverted, with a clinical stabilization during the entire follow-up course. Accordingly, gross motor functions improved and then stabilized. Psychomotor evaluations documented an increasing communicative intent, the acquisition of new social skills and the capability to carry out simple orders. Neurophysiological assessments, which included EEG, VEP/ERG and BAEPs, remained unchanged. Brain MRI also stabilized, showing no further lesions and cerebral atrophy improvement. Compared to pre-transplant assessments, urinary ethylmalonic acid strikingly reduced, and plasma thiosulphate fully normalized. The child maintained good clinical conditions and never experienced metabolic crises nor epileptic seizures. CONCLUSIONS The long-term follow-up of the first EE transplanted patient demonstrates that liver transplantation stabilizes, or even improves, disease course, therefore representing a potentially elective option especially in early-diagnosed patients, such as those detected by newborn screening, before irreversible neurological damage occurs.
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Affiliation(s)
- Giorgia Olivieri
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, 00165, Rome, Italy
| | - Diego Martinelli
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, 00165, Rome, Italy
| | - Daniela Longo
- Neuroradiology Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Chiara Grimaldi
- Division of Abdominal Transplantation and Hepatobiliopancreatic Surgery, Bambino Gesù Children's Research Hospital IRCCS, Rome, Italy
| | - Daniela Liccardo
- Division of Hepatology and Gastroenterology, Bambino Gesù Children's Research Hospital IRCCS, Rome, Italy
| | - Ivano Di Meo
- Unit of Medical Genetics and Neurogenetics, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milan, Italy
| | - Andrea Pietrobattista
- Division of Hepatology and Gastroenterology, Bambino Gesù Children's Research Hospital IRCCS, Rome, Italy
| | - Anna Sidorina
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, 00165, Rome, Italy
| | - Michela Semeraro
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, 00165, Rome, Italy
| | - Carlo Dionisi-Vici
- Division of Metabolism, Bambino Gesù Children's Hospital, IRCCS, Piazza S. Onofrio 4, 00165, Rome, Italy.
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8
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Cardelo Autero N, Cordón Martínez AM, Ramos-Fernández JM. Ethylmalonic encephalopathy: Phenotype-genotype description and review of its management. Neurologia 2021; 36:S0213-4853(21)00009-8. [PMID: 33722452 DOI: 10.1016/j.nrl.2021.01.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 01/24/2021] [Accepted: 01/31/2021] [Indexed: 12/12/2022] Open
Affiliation(s)
- N Cardelo Autero
- Servicio de Pediatría, Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, España
| | - A M Cordón Martínez
- Servicio de Pediatría (lactantes), Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, España
| | - J M Ramos-Fernández
- Sección de Neurología Pediátrica, Grupo IBIMA, Servicio de Pediatría, Hospital Regional Universitario Materno-Infantil de Málaga, Málaga, España.
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9
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Sathe G, Deepha S, Gayathri N, Nagappa M, Parayil Sankaran B, Taly AB, Khanna T, Pandey A, Govindaraj P. Ethylmalonic encephalopathy ETHE1 p. D165H mutation alters the mitochondrial function in human skeletal muscle proteome. Mitochondrion 2021; 58:64-71. [PMID: 33639274 DOI: 10.1016/j.mito.2021.02.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 01/19/2021] [Accepted: 02/12/2021] [Indexed: 01/01/2023]
Abstract
Ethylmalonic encephalopathy (EE) is a rare autosomal recessive inborn error of metabolism. To study the molecular effects of ETHE1 p. D165H mutation, we employed mass spectrometry-based mitochondrial proteome and phosphoproteome profiling in the human skeletal muscle. Eighty-six differentially altered proteins were identified, of which thirty-seven mitochondrial proteins were differentially expressed, and most of the proteins (37%) were down-regulated in the OXPHOS complex-IV. Also, nine phosphopeptides that correspond to eight mitochondrial proteins were significantly affected in EE patient. These altered proteins recognized are involved in several pathways and molecular functions, predominantly in oxidoreductase activity. This is the first study that has integrated proteome and phosphoproteome of skeletal muscle and identified multiple proteins associated in the pathogenesis of EE.
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Affiliation(s)
- Gajanan Sathe
- Institute of Bioinformatics, International Tech Park, Bangalore, India; Center for Molecular Medicine, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Manipal Academy of Higher Education, Manipal, India
| | - Sekar Deepha
- Department of Neuropathology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Neuromuscular Laboratory, Neurobiology Research Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
| | - Narayanappa Gayathri
- Department of Neuropathology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Neuromuscular Laboratory, Neurobiology Research Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
| | - Madhu Nagappa
- Neuromuscular Laboratory, Neurobiology Research Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Department of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
| | - Bindu Parayil Sankaran
- Neuromuscular Laboratory, Neurobiology Research Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Department of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Genetic Metabolic Disorders Services, Children's Hospital at Westmead, NSW, Australia; The Children's Hospital at Westmead Clinical School, Sydney Medical School, The Faculty of Medicine and Health, The University of Sydney, NSW, Australia
| | - Arun B Taly
- Neuromuscular Laboratory, Neurobiology Research Center, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Department of Neurology, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India
| | - Tripti Khanna
- Indian Council of Medical Research (ICMR), New Delhi, India
| | - Akhilesh Pandey
- Institute of Bioinformatics, International Tech Park, Bangalore, India; Center for Molecular Medicine, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Manipal Academy of Higher Education, Manipal, India
| | - Periyasamy Govindaraj
- Institute of Bioinformatics, International Tech Park, Bangalore, India; Center for Molecular Medicine, National Institute of Mental Health and Neurosciences (NIMHANS), Bangalore, India; Manipal Academy of Higher Education, Manipal, India.
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Zhou W, Cai H, Li H, Ji Z, Gu M. Quantification of Differential Metabolites in Dried Blood Spots Using Second-Tier Testing for SCADD/IBDD Disorders Based on Large-Scale Newborn Screening in a Chinese Population. Front Pediatr 2021; 9:757424. [PMID: 34869113 PMCID: PMC8639864 DOI: 10.3389/fped.2021.757424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 10/20/2021] [Indexed: 12/14/2022] Open
Abstract
Background: Although newborn screening (NBS) for metabolic defects using the marker butyl carnitine (C4) combined with the C4-to-acetylcarnitine ratio is adequate, the incorporation of novel parameters may improve differential testing for these disorders without compromising sensitivity. Methods: Analytical and clinical performance was evaluated by MS/MS using 237 initially positive neonatal samples between March 2019 and March 2020 at the Newborn Screening Center of Xuzhou Maternity and Child Health Care Hospital. Additionally, second-tier testing by ultraperformance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) combined with the quantification of ethylmalonate (EMA) or isobutyryl-glycine (IBG) in dried blood spots (DBSs) was performed to reduce the false-positive rate. Results: We reviewed initial MS/MS data for DBSs from 469,730 neonates, and a second-tier test was performed using 237 samples that exceeded the C4 concentration cutoff value. Eleven variants of the ACADS gene were identified, with c.1031A>G (p.E344G) being the most common. Fifteen ACAD8 mutations were identified in seven patients, and Swiss modeling and amino acid conservation analyses were conducted for the novel variants. Based on a retrospective analysis of EMA and IBG, the application of second-tier tests before the release of neonatal screening results reduced referrals by over 91.89% and improved the positive predictive value (PPV) for short-chain acyl-CoA dehydrogenase deficiency/isobutyryl-CoA dehydrogenase deficiency (SCADD/IBDD) screening. Conclusion: A screening algorithm including EMA/IBG improves target differential testing for NBS and may eliminate unnecessary referrals while maintaining 100% sensitivity. Second-tier screening using UPLC-MS/MS as a rapid and convenient supplemental DNA sequencing method may be beneficial for differential detection.
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Affiliation(s)
- Wei Zhou
- Newborn Screening Center, The Affiliated Xuzhou Maternity and Child Health Care Hospital of Xuzhou Medical University, Xuzhou, China.,Research Center for Biochemistry and Molecular Biology and Jiangsu Key Laboratory of Brain Disease Bioinformation, Xuzhou Medical University, Xuzhou, China
| | - Heng Cai
- Pharmacology College, Xuzhou Medical University, Xuzhou, China
| | - Huizhong Li
- Newborn Screening Center, The Affiliated Xuzhou Maternity and Child Health Care Hospital of Xuzhou Medical University, Xuzhou, China
| | - Zhe Ji
- The First Clinical College, Xuzhou Medical University, Xuzhou, China
| | - Maosheng Gu
- Newborn Screening Center, The Affiliated Xuzhou Maternity and Child Health Care Hospital of Xuzhou Medical University, Xuzhou, China
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11
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Zhou GP, Qu W, Zhu ZJ, Sun LY, Wei L, Zeng ZG, Liu Y. Compromised therapeutic value of pediatric liver transplantation in ethylmalonic encephalopathy: A case report. World J Gastroenterol 2020; 26:6295-6303. [PMID: 33177801 PMCID: PMC7596645 DOI: 10.3748/wjg.v26.i40.6295] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/25/2020] [Accepted: 09/17/2020] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Ethylmalonic encephalopathy (EE) is a rare autosomal recessive metabolic disorder caused by impaired mitochondrial sulfur dioxygenase. Due to poor therapeutic effect of current conventional treatments, progressive psychomotor regression and neurological impairment usually contribute to early death in the first decade of life. Liver transplantation (LT) is emerging as a novel therapeutic option for EE; however, worldwide experience is still limited.
CASE SUMMARY An 18-mo-old patient with the diagnosis of EE received a living donor liver transplant in our institution, which, to our knowledge, is the first case in Asian-Pacific countries. During 20 mo of follow-up, the longitudinal metabolic evaluations revealed a wild fluctuation in urinary EMA levels, still far beyond the normal range. Urinary 2-methylsuccinic acid levels gradually restored to normal, whereas the concentrations of urinary isobutyrylglycine and plasma C4- and C5-acylcarnitines fluctuated markedly and still remained above the reference limits. Only mild amelioration of petechiae and ecchymosis was observed, and no dramatic reversion of chronic mucoid diarrhea and orthostatic acrocyanosis occurred. Although brain magnetic resonance imaging suggested a certain improvement in basal ganglia lesions, the patient still presented developmental delay and neurologic disability.
CONCLUSION LT may bring about a partial but not complete cure to EE. Given its definite role in defending against the devastating natural progression of EE, LT should still be considered for patients with EE in the absence of other superior therapeutic options. Early establishment of diagnosis and initiation of conventional treatment pre-transplant, timely LT, and continuous administration of metabolism-correcting medications post-transplant may be helpful in minimizing the neurologic impairment and maximizing the therapeutic value of LT in EE.
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Affiliation(s)
- Guang-Peng Zhou
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Wei Qu
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Zhi-Jun Zhu
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Li-Ying Sun
- Liver Transplantation Center, Intensive Care Unit, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Lin Wei
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Zhi-Gui Zeng
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
| | - Ying Liu
- Liver Transplantation Center, National Clinical Research Center for Digestive Diseases, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China
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12
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Identification of a novel homozygous nonsense variant in a Chinese patient with ethylmalonic encephalopathy and a genotype-phenotype spectrum review. Clin Chim Acta 2020; 509:8-17. [DOI: 10.1016/j.cca.2020.05.051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 05/27/2020] [Accepted: 05/29/2020] [Indexed: 11/23/2022]
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13
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Riboflavin Deficiency-Implications for General Human Health and Inborn Errors of Metabolism. Int J Mol Sci 2020; 21:ijms21113847. [PMID: 32481712 PMCID: PMC7312377 DOI: 10.3390/ijms21113847] [Citation(s) in RCA: 75] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 05/20/2020] [Accepted: 05/26/2020] [Indexed: 01/13/2023] Open
Abstract
As an essential vitamin, the role of riboflavin in human diet and health is increasingly being highlighted. Insufficient dietary intake of riboflavin is often reported in nutritional surveys and population studies, even in non-developing countries with abundant sources of riboflavin-rich dietary products. A latent subclinical riboflavin deficiency can result in a significant clinical phenotype when combined with inborn genetic disturbances or environmental and physiological factors like infections, exercise, diet, aging and pregnancy. Riboflavin, and more importantly its derivatives, flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), play a crucial role in essential cellular processes including mitochondrial energy metabolism, stress responses, vitamin and cofactor biogenesis, where they function as cofactors to ensure the catalytic activity and folding/stability of flavoenzymes. Numerous inborn errors of flavin metabolism and flavoenzyme function have been described, and supplementation with riboflavin has in many cases been shown to be lifesaving or to mitigate symptoms. This review discusses the environmental, physiological and genetic factors that affect cellular riboflavin status. We describe the crucial role of riboflavin for general human health, and the clear benefits of riboflavin treatment in patients with inborn errors of metabolism.
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