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Khan SA, Fakih M, Taufiq N, Ahmerin A, Bangash A, Iqbal Malik M. Clinical Spectrum of Hereditary Tyrosinemia Type 1 in a Cohort of Pakistani Children. Clin Med Insights Pediatr 2024; 18:11795565241236176. [PMID: 38456192 PMCID: PMC10919130 DOI: 10.1177/11795565241236176] [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: 05/07/2023] [Accepted: 01/30/2024] [Indexed: 03/09/2024] Open
Abstract
Background Hereditary Tyrosinemia Type 1 (HT1), a rare autosomal recessive metabolic disorder, arises from fumarylacetoacetate (FAH) enzyme deficiency, resulting in toxic metabolite buildup. It manifests in acute, subacute, and chronic forms, with early diagnosis and Nitisinone treatment being vital. Objectives The study aims to highlight the different clinical presentations of Hereditary Tyrosinemia type 1 in a cohort of Pakistani children. Design Retrospective observational study. Methodology All patients diagnosed with HT1 at Shifa International Hospital, Islamabad and Pak Emirates Military Hospital, Rawalpindi between 2010 and 2023 were included. Information was collected regarding age, gender, symptoms, physical signs, and laboratory results. Results The study identified 6 cases of HT1. The average age at presentation was 8 months, with a mean delay in diagnosis of 26.8 months. Males were 4 (66.7%) and 2 (33.3%) were females. All patients had underlying liver disease presenting as abdominal distension with hepatosplenomegaly and accompanying growth failure. Four cases presented with rickets, 2 of which had hypophosphatemic rickets. Urine for succinylacetone was raised in all patients. Alpha fetoprotein was raised but hepatocellular carcinoma was diagnosed in 1 patient only. Low protein diet, and vitamin supplements were used for management. Five of the 6 patients died within 2 years of diagnosis. Conclusion Delayed referrals and unavailability of Nitisinone are the major challenges in diagnosing and treating HT1 in Pakistan.
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Affiliation(s)
- Sabeen Abid Khan
- Shifa College of Medicine, Tameer-e-Millat University, Islamabad, Pakistan
| | - Misbah Fakih
- Shifa College of Medicine, Tameer-e-Millat University, Islamabad, Pakistan
| | - Nida Taufiq
- Pak Emirates Military Hospital, Rawalpindi, Punjab, Pakistan
| | - Afaaf Ahmerin
- Shifa College of Medicine, Tameer-e-Millat University, Islamabad, Pakistan
| | - Asfand Bangash
- Shifa College of Medicine, Tameer-e-Millat University, Islamabad, Pakistan
| | - Munir Iqbal Malik
- Shifa College of Medicine, Tameer-e-Millat University, Islamabad, Pakistan
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2
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Barone H, Elgen IB, Bliksrud YT, Vangsøy Hansen E, Skavhellen RR, Furevik MI, Haavik J. Case report: ADHD and prognosis in tyrosinemia type 1. Front Psychiatry 2023; 14:1213590. [PMID: 37533886 PMCID: PMC10392124 DOI: 10.3389/fpsyt.2023.1213590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 06/26/2023] [Indexed: 08/04/2023] Open
Abstract
Neurometabolic disorders such as tyrosinemia type 1 (TYRSN1) may interfere with brain metabolism and show symptoms of attention-deficit hyperactivity disorder (ADHD) in patients treated with the enzyme inhibitor nitisinone [2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione, NTBC]. It has been reported that ADHD treatment improves treatment compliance, which is imperative for the long-term prognosis of patients with TYRSN1. In this study, we report the case of a male patient who was diagnosed with TYRSN1 at 3 months of age and was subsequently treated with NTBC, restricted protein intake, and amino acids supplementation. At 7 years of age, he was referred for neuropsychiatric assessment, diagnosed with ADHD, and treated with methylphenidate. The effects of the treatment were monitored via parental interviews, questionnaires covering ADHD symptoms, and a continuous performance test. A reduction in ADHD symptoms, particularly inattentiveness, was observed across all measures. The early identification of ADHD and the treatment of neurometabolic disorders, such as TYRSN1, may be important from a lifetime perspective as this may improve the prognosis of the medical condition as well.
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Affiliation(s)
- Helene Barone
- Regional Resource Center for Autism, ADHD and Tourette Syndrome, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Irene Bircow Elgen
- Department of Child and Adolescent Psychiatry, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | | | | | - Rita Rigmor Skavhellen
- Department of Child and Adolescent Psychiatry, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Magne Ivar Furevik
- Department of Child and Adolescent Psychiatry, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Jan Haavik
- Bergen Center of Brain Plasticity, Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
- Department of Biomedicine, University of Bergen, Bergen, Norway
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3
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Hajji H, Imbard A, Spraul A, Taibi L, Barbier V, Habes D, Brassier A, Arnoux JB, Bouchereau J, Pichard S, Sissaoui S, Lacaille F, Girard M, Debray D, de Lonlay P, Schiff M. Initial presentation, management and follow-up data of 33 treated patients with hereditary tyrosinemia type 1 in the absence of newborn screening. Mol Genet Metab Rep 2022; 33:100933. [DOI: 10.1016/j.ymgmr.2022.100933] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 10/30/2022] [Accepted: 10/30/2022] [Indexed: 11/11/2022] Open
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van Ginkel WG, Winn SR, Dudley S, Krenik D, Perez R, Rimann N, Thöny B, Raber J, Harding CO. Biochemical and behavioural profile of NTBC treated Tyrosinemie type 1 mice. Mol Genet Metab 2022; 137:9-17. [PMID: 35868243 DOI: 10.1016/j.ymgme.2022.07.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 07/01/2022] [Accepted: 07/02/2022] [Indexed: 11/18/2022]
Abstract
BACKGROUND Tyrosinemia type 1 (HT1) is a rare metabolic disorder caused by a defect in the tyrosine catabolic pathway. Since HT1 patients are treated with NTBC, outcome improved and life expectancy greatly increased. However extensive neurocognitive and behavioural problems have been described, which might be related to treatment with NTBC, the biochemical changes induced by NTBC, or metabolites accumulating due to the enzymatic defect characterizing the disease. OBJECTIVE To study the possible pathophysiological mechanisms of brain dysfunction in HT1, we assessed blood and brain LNAA, and brain monoamine neurotransmitter metabolite levels in relation to behavioural and cognitive performance of HT1 mice. DESIGN C57BL/6 littermates were divided in three different experimental groups: HT1, heterozygous and wild-type mice (n = 10; 5 male). All groups were treated with NTBC and underwent cognitive and behavioural testing. One week after behavioural testing, blood and brain material were collected to measure amino acid profiles and brain monoaminergic neurotransmitter levels. RESULTS Irrespective of the genetic background, NTBC treatment resulted in a clear increase in brain tyrosine levels, whereas all other brain LNAA levels tended to be lower than their reference values. Despite these changes in blood and brain biochemistry, no significant differences in brain monoamine neurotransmitter (metabolites) were found and all mice showed normal behaviour and learning and memory. CONCLUSION Despite the biochemical changes, NTBC and genotype of the mice were not associated with poorer behavioural and cognitive function of the mice. Further research involving dietary treatment of FAH-/- are warranted to investigate whether this reveals the cognitive impairments that have been seen in treated HT1 patients.
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Affiliation(s)
- Willem G van Ginkel
- University of Groningen, Beatrix Children's Hospital, University Medical Center Groningen, Groningen, the Netherlands; Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, USA
| | - Shelley R Winn
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, USA
| | - Sandra Dudley
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, USA
| | - Destine Krenik
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA
| | - Ruby Perez
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA
| | - Nicole Rimann
- Division of Metabolism, Department of Pediatrics, University of Zurich, Zurich, Switzerland
| | - Beat Thöny
- Division of Metabolism, Department of Pediatrics, University of Zurich, Zurich, Switzerland
| | - Jacob Raber
- Department of Behavioral Neuroscience, Oregon Health & Science University, Portland, OR, USA; Departments of Neurology and Radiation Medicine, Division of Neuroscience, ONPRC, Oregon Health & Science University, Portland, OR, USA
| | - Cary O Harding
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, OR, USA.
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5
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Nicolas CT, VanLith CJ, Hickey RD, Du Z, Hillin LG, Guthman RM, Cao WJ, Haugo B, Lillegard A, Roy D, Bhagwate A, O'Brien D, Kocher JP, Kaiser RA, Russell SJ, Lillegard JB. In vivo lentiviral vector gene therapy to cure hereditary tyrosinemia type 1 and prevent development of precancerous and cancerous lesions. Nat Commun 2022; 13:5012. [PMID: 36008405 PMCID: PMC9411607 DOI: 10.1038/s41467-022-32576-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 08/08/2022] [Indexed: 11/23/2022] Open
Abstract
Conventional therapy for hereditary tyrosinemia type-1 (HT1) with 2-(2-nitro-4-trifluoromethylbenzoyl)−1,3-cyclohexanedione (NTBC) delays and in some cases fails to prevent disease progression to liver fibrosis, liver failure, and activation of tumorigenic pathways. Here we demonstrate cure of HT1 by direct, in vivo administration of a therapeutic lentiviral vector targeting the expression of a human fumarylacetoacetate hydrolase (FAH) transgene in the porcine model of HT1. This therapy is well tolerated and provides stable long-term expression of FAH in pigs with HT1. Genomic integration displays a benign profile, with subsequent fibrosis and tumorigenicity gene expression patterns similar to wild-type animals as compared to NTBC-treated or diseased untreated animals. Indeed, the phenotypic and genomic data following in vivo lentiviral vector administration demonstrate comparative superiority over other therapies including ex vivo cell therapy and therefore support clinical application of this approach. Hereditary tyrosinemia type 1 (HT1) is an inborn error of metabolism caused by a deficiency in fumarylacetoacetate hydrolase (FAH). Here, the authors show in an animal model that HT1 can be treated via in vivo portal vein administration of a lentiviral vector carrying the human FAH transgene.
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Affiliation(s)
- Clara T Nicolas
- Department of Surgery, Mayo Clinic, Rochester, MN, USA.,Faculty of Medicine, University of Barcelona, Barcelona, Spain.,Department of Surgery, University of Alabama Birmingham, Birmingham, AL, USA
| | | | - Raymond D Hickey
- Department of Surgery, Mayo Clinic, Rochester, MN, USA.,Department of Molecular Medicine, Mayo Clinic, Rochester, MN, USA
| | - Zeji Du
- Department of Surgery, Mayo Clinic, Rochester, MN, USA
| | - Lori G Hillin
- Department of Surgery, Mayo Clinic, Rochester, MN, USA
| | - Rebekah M Guthman
- Department of Surgery, Mayo Clinic, Rochester, MN, USA.,Medical College of Wisconsin, Wausau, WI, USA
| | - William J Cao
- Department of Surgery, Mayo Clinic, Rochester, MN, USA
| | | | | | - Diya Roy
- Department of Surgery, Mayo Clinic, Rochester, MN, USA
| | - Aditya Bhagwate
- Department of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA
| | - Daniel O'Brien
- Department of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA
| | - Jean-Pierre Kocher
- Department of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA
| | - Robert A Kaiser
- Department of Surgery, Mayo Clinic, Rochester, MN, USA.,Midwest Fetal Care Center, Children's Hospitals and Clinics of Minnesota, Minneapolis, MN, USA
| | | | - Joseph B Lillegard
- Department of Surgery, Mayo Clinic, Rochester, MN, USA. .,Midwest Fetal Care Center, Children's Hospitals and Clinics of Minnesota, Minneapolis, MN, USA. .,Pediatric Surgical Associates, Minneapolis, MN, USA.
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6
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Abbas K, Basit J, Rehman MEU. Adequacy of nitisinone for the management of alkaptonuria. Ann Med Surg (Lond) 2022; 80:104340. [PMID: 36045846 PMCID: PMC9422360 DOI: 10.1016/j.amsu.2022.104340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 07/28/2022] [Accepted: 07/31/2022] [Indexed: 11/24/2022] Open
Abstract
Alkaptonuria is a rare hereditary disease with a defective enzyme that results in increased homogentisic acid levels in the body. Homogentisic acid accumulates in multiple body parts and initializes tissue damage. Clinical manifestations such as pigmentation of the skin areas and joint destruction result in ochronosis. Nitisinone decreases serum and urinary homogentisic acid levels, improving morbidity by preventing and slowing the progression of alkaptonuria. Nitisinone-induced hypertyrosinemia causes keratopathy and mental ill effects, which can be managed by diet restriction and regular check-ups. A personalized approach is required for treatment by nitisinone. Low-dose oral nitisinone is associated with overall good results and a better safety profile.
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7
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Clinical experience with hepatorenal tyrosinemia from a single Egyptian center. PLoS One 2022; 17:e0268017. [PMID: 35536841 PMCID: PMC9089876 DOI: 10.1371/journal.pone.0268017] [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: 11/10/2021] [Accepted: 04/20/2022] [Indexed: 11/19/2022] Open
Abstract
Although very recently, in Egypt, sick newborn screening has included screening for hepatorenal tyrosinemia, yet, it is not yet included in nationwide neonatal screening and hence diagnosis may be delayed. The aim of this study was to analyze data of all cases presenting with hepatorenal tyrosinemia to the Pediatric Hepatology Unit, Cairo University, Egypt from 2006 to 2019. Data were retrieved from patients’ files including age of onset of symptoms, clinical signs, blood counts, liver functions, serum phosphorous, alpha-fetoprotein, succinylacetone and abdominal ultrasound. During this period, 76 patients were diagnosed with hepatorenal tyrosinemia if succinylacetone in dry blood spot was elevated above 1 μmol/L. These 76 cases came from 70 families; consanguinity was reported in 61 families. In our cohort we reported 30 affected siblings with a similar clinical presentation, who died undiagnosed. Presentation was acute in 26%, subacute in 30% and chronic in 43%. Abdominal distention was the commonest presenting symptom (52.6%). Coagulopathy was the commonest derangement in liver functions; hyperbilirubinemia and raised transaminases were less common. Ultrasound findings included hepatic focal lesions in 47% and enlarged echogenic kidneys in 39% and 45.3% respectively. Only 20 children were treated with Nitisinone because of unavailability and high costs; seven out of them underwent liver transplantation. In conclusion, although hepatorenal tyrosinemia is a rare inborn error of metabolism, in a large population country with high rate of consanguinity; this disease is not uncommonly diagnosed. The current treatment is not readily available because of the costs in a resource-limited country. Neonatal screening and subsidization of the costly medication need to be considered.
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8
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Varughese B, Madrewar D, Polipalli SK, Kapoor S. Development of Flow Injection Analysis Method for the Second-Tier Estimation of Succinylacetone in Dried Blood Spot of Newborn Screening. Indian J Clin Biochem 2022; 37:40-50. [PMID: 35125692 PMCID: PMC8799791 DOI: 10.1007/s12291-020-00944-z] [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: 06/09/2020] [Accepted: 12/08/2020] [Indexed: 01/03/2023]
Abstract
Tyrosinemia type 1 (TYR1) is a devastating aminoacidopathy, leading to mortality without medical intervention. Although, detection and quantification of tyrosine in dried blood spot (DBS) is possible, but being a non-specific marker for TYR1 and its frequent association with transient neonatal tyrosinemia limits its applicability. Despite, Succinylacetone (SUAC) being a pathognomonic marker for TYR1, but not often detectable by routine newborn screening (NBS). We envisaged to determine SUAC in DBS by an in-house flow injection analysis method on a liquid chromatography/tandem mass spectrometry (LC-MS/MS). Succinylacetone was eluted from the residual 3.2 mm DBS of primary NBS by an extraction solution containing acetonitrile-water-formic acid mixture containing stable-isotope labelled internal standard (IS) for SUAC and hydrazine. Detection and quantification was performed by the mass spectrometer using multiple reaction monitoring mode at m/z 155.1 → 109.1 for SUAC and m/z 160.1 → 114.1 for the SUAC IS. The assay was linear over a calibration range of 0.122-117.434 µmol/L. The Intra-day and Inter-day precision and accuracy for the assay was determined at two different levels of SUAC (2.542 µmol/L and 14.641 µmol/L), which showed a coefficient of variation of (6.91% and 12.65%) and (8.57% and 12.27%) respectively. The accuracy also ranged between 101.2 and 103.87%.This method provided the necessary sensitivity, precision, accuracy, recovery and linearity and hence, has the potential to reduce the false positive, false negative results which significantly minimise the cost involved in the screening and follow up of TYR1 patients. SUPPLEMENTARY INFORMATION The online version of this article (10.1007/s12291-020-00944-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bijo Varughese
- Department of Paediatrics, Paediatrics Research and Genetic Lab, Maulana Azad Medical College (University of Delhi) and Associated Lok Nayak Hospital, New Delhi, 110002 India
| | | | - Sunil Kumar Polipalli
- Department of Paediatrics, Paediatrics Research and Genetic Lab, Maulana Azad Medical College (University of Delhi) and Associated Lok Nayak Hospital, New Delhi, 110002 India
| | - Seema Kapoor
- Department of Paediatrics, Paediatrics Research and Genetic Lab, Maulana Azad Medical College (University of Delhi) and Associated Lok Nayak Hospital, New Delhi, 110002 India
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9
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Yilmaz O, Daly A, Pinto A, Ashmore C, Evans S, Gupte G, Jackson R, Yabanci Ayhan N, MacDonald A. Physical Growth of Patients with Hereditary Tyrosinaemia Type I: A Single-Centre Retrospective Study. Nutrients 2021; 13:3070. [PMID: 34578949 PMCID: PMC8472760 DOI: 10.3390/nu13093070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/26/2021] [Accepted: 08/30/2021] [Indexed: 12/23/2022] Open
Abstract
In a retrospective review, we aimed to assess long-term growth in 17 patients (n = 11 males) with hereditary tyrosinaemia type I (HTI). Median age at assessment was 15.6 years (5.7-26.6 years) and median age at diagnosis was 1 month (range: 0-16 months), with 35% (n = 6/17) symptomatic on presentation. From the age of 8 years, there was a noticeable change in median height, weight, and body-mass-index [BMI]-z-scores. Median height-for-age z-scores were consistently ≤ -1 (IQR -1.6, -0.5) during the first 8 years of life but increased with age. Weight-for-age z-scores ranged between -1 to 0 (IQR -1.2, 0.1) in the first 8 years; then increased to > 0.5 (IQR -0.3, 1.3) by age 16 years, and BMI-for-age z-scores ranged from 0 to 1 (IQR -0.7, 1.3) up to 8 years, and >1 (IQR -0.2, 1.9) until 16 years. The percentage of overweight and obesity was lowest in children aged < 5 years, and consistently > 40% in patients aged between 7 to 16 years. The prescribed total protein intake was associated with improved height growth (p < 0.01). Impaired growth in early life improved with age achieving normal population standards. Further studies are needed to investigate factors that influence growth outcome in HTI patients.
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Affiliation(s)
- Ozlem Yilmaz
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Ankara Yildirim Beyazit University, Ankara 06760, Turkey
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Ankara University, Ankara 06290, Turkey;
| | - Anne Daly
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
| | - Alex Pinto
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
| | - Catherine Ashmore
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
| | - Sharon Evans
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
| | - Girish Gupte
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
| | - Richard Jackson
- Cancer Research UK Liverpool Cancer Trials Unit, University of Liverpool, Liverpool L69 3GL, UK;
| | - Nurcan Yabanci Ayhan
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Ankara University, Ankara 06290, Turkey;
| | - Anita MacDonald
- Birmingham Women’s and Children’s Hospital, Birmingham B4 6NH, UK; (O.Y.); (A.D.); (A.P.); (C.A.); (S.E.); (G.G.)
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10
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Daou KN, Barhoumi A, Bassyouni A, Karam PE. Diagnostic and Therapeutic Challenges of Hereditary Tyrosinemia Type 1 in Lebanon: A 12-Year Retrospective Review. Front Pediatr 2021; 9:698577. [PMID: 34422723 PMCID: PMC8377248 DOI: 10.3389/fped.2021.698577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 07/06/2021] [Indexed: 11/13/2022] Open
Abstract
Background: Hereditary tyrosinemia type 1 is a rare genetic disorder leading to liver cirrhosis and hepatocellular carcinoma. Few decades ago, dietary measures and ultimately liver transplant constituted the only treatment modalities. Nowadays, early diagnosis and therapy with nitisinone can reverse the clinical picture. In developing countries, diagnostic and therapeutic challenges may affect the outcome of this disease. The choice of the treatment modality may depend on the economic status of each country. Few reports on the long-term outcome of hereditary tyrosinemia type 1 are available from developing and Arab countries. Methods: A retrospective study of charts of Lebanese patients diagnosed with tyrosinemia type 1 and followed, at the American University of Beirut, during a 12-year period was performed. Clinical presentation and liver biochemical profile at diagnosis were analyzed, along with therapeutic modalities and long-term outcome. Results: Twenty-two children were diagnosed and followed during the study period. Median age at diagnosis was 7 months (range: one day to 35 months). Most of the patients presented with hepatomegaly and jaundice. Four patients were referred for atypical presentations with developmental delay and seizures, secondary to undiagnosed hypoglycemia episodes. Around half of the patients presented with failure to thrive. Transaminitis, cholestasis and increased α-fetoprotein level were variably present at diagnosis (36% to 50%). All patients had elevated plasma tyrosine and urinary succinylacetone levels. Genetic testing was performed in 9%. Only one third could be treated with nitisinone. Liver transplant was electively performed in 9% of cases, to overcome the long-term cost of nitisinone. One third of the patients died between the age of 1 month and 11 years. Surviving patients are still candidates for liver transplant. Conclusion: Our experience reflects the challenges of diagnosis and treatment of hereditary tyrosinemia type 1 in a developing country. In the absence of specific neonatal screening, early diagnosis relies mostly on the clinical awareness of the physician. Long-term nitisinone use may be deterred by its high cost and liver transplantation carries risks of surgical complications. New, effective, and less expensive treatments are needed, especially for developing countries.
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Affiliation(s)
- Karim N. Daou
- Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Abir Barhoumi
- Department of Nutrition, American University of Beirut Medical Center, Beirut, Lebanon
- Inherited Metabolic Diseases Program, Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Amina Bassyouni
- Inherited Metabolic Diseases Program, Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
| | - Pascale E. Karam
- Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
- Inherited Metabolic Diseases Program, Department of Pediatrics and Adolescent Medicine, American University of Beirut Medical Center, Beirut, Lebanon
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Wolffenbuttel BHR, Heiner-Fokkema MR, van Spronsen FJ. Preventive use of nitisinone in alkaptonuria. Orphanet J Rare Dis 2021; 16:343. [PMID: 34344451 PMCID: PMC8336241 DOI: 10.1186/s13023-021-01977-0] [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] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 07/25/2021] [Indexed: 11/17/2022] Open
Abstract
Alkaptonuria (AKU, OMIM 203500) is a rare congenital disorder caused by a deficiency of the enzyme homogentisate-1,2,-dioxygenase. The long-term consequences of AKU are joint problems, cardiac valve abnormalities and renal problems. Landmark intervention studies with nitisinone 10 mg daily, suppressing an upstream enzyme activity, demonstrated its beneficial effects in AKU patients with established complications, which usually start to develop in the fourth decade. Lower dose of nitisinone in the range of 0.2–2 mg daily will already reduce urinary homogentisic acid (uHGA) excretion by > 90%, which may prevent AKU-related complications earlier in the course of the disease while limiting the possibility of side-effects related to the increase of plasma tyrosine levels caused by nitisinone. Future preventive studies should establish the lowest possible dose for an individual patient, the best age to start treatment and also collect evidence to which level uHGA excretion should be reduced to prevent complications.
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Affiliation(s)
- Bruce H R Wolffenbuttel
- Department of Internal Medicine, Division of Endocrinology, University of Groningen, University Medical Center Groningen, P.O. Box 30001, 9700 RB, Groningen, The Netherlands.
| | - M Rebecca Heiner-Fokkema
- Department of Laboratory Medicine, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
| | - Francjan J van Spronsen
- Beatrix Children's Hospital, Division of Metabolic Disorders, University of Groningen, University Medical Center Groningen, Groningen, The Netherlands
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Spiekerkoetter U, Couce ML, Das AM, de Laet C, Dionisi-Vici C, Lund AM, Schiff M, Spada M, Sparve E, Szamosi J, Vara R, Rudebeck M. Long-term safety and outcomes in hereditary tyrosinaemia type 1 with nitisinone treatment: a 15-year non-interventional, multicentre study. Lancet Diabetes Endocrinol 2021; 9:427-435. [PMID: 34023005 DOI: 10.1016/s2213-8587(21)00092-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/24/2021] [Accepted: 03/30/2021] [Indexed: 12/14/2022]
Abstract
BACKGROUND Since the EU approval of nitisinone in 2005, prognosis for patients with hereditary tyrosinaemia type 1 has changed dramatically, with patients living with the disease now reaching adulthood for the first time in history. This study aimed to assess the long-term safety and outcomes of nitisinone treatment in patients with hereditary tyrosinaemia type 1. METHODS We did a non-interventional, non-comparative, multicentre study in 77 sites across 17 countries in Europe and collected retrospective and prospective longitudinal data in patients with hereditary tyrosinaemia type 1 who were treated with oral nitisinone during the study period (Feb 21, 2005, to Sept 30, 2019). There were no specific exclusion criteria. Patients were followed-up with an investigator at least annually for as long as they were treated, or until the end of the study. The primary endpoints, occurrence of adverse events related to hepatic, renal, ophthalmic, haematological, or cognitive or developmental function, were assessed in the complete set (all patients already receiving treatment at the index date [Feb 21, 2005] or starting treatment thereafter) and the index set (the subset of patients who had their first dose on the index date or later only). FINDINGS 315 patients were enrolled during the study period (complete set). Additionally, data from 24 patients who had liver transplantation or died during the post-marketing surveillance programme were retrieved (extended analysis set; 339 patients). Median treatment duration was 11·2 years (range 0·7-28·4); cumulative nitisinone exposure was 3172·7 patient-years. Patients who were diagnosed by neonatal screening started nitisinone treatment at median age 0·8 months versus 8·5 months in those who presented clinically. Incidences of hepatic, renal, ophthalmic, haematological, or cognitive or developmental adverse events were low. Occurrence of liver transplantation or death was more frequent the later that treatment was initiated (none of 70 patients who started treatment at age <28 days vs 35 [13%] of 268 patients who started treatment at age ≥28 days). 279 (89%) of 315 patients were assessed as having either very good or good nitisinone treatment compliance. Treatment and diet compliance declined as patients aged. Suboptimal plasma phenylalanine and tyrosine levels were observed. The majority of patients were reported to have good overall clinical condition throughout treatment; 176 (87%) of 203 during the entire study, 98% following 1 year of treatment. INTERPRETATION Long-term nitisinone treatment was well tolerated and no new safety signals were revealed. Life-limiting hepatic disease appears to have been prevented by early treatment start. Neonatal screening was the most effective way of ensuring early treatment. Standardised monitoring of blood tyrosine, phenylalanine, and nitisinone levels has potential to guide individualised therapy. FUNDING Swedish Orphan Biovitrum (Sobi).
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Affiliation(s)
- Ute Spiekerkoetter
- Department of Paediatrics and Adolescent Medicine, University Medical Centre, Faculty of Medicine, University of Freiburg, Freiburg im Breisgau, Germany
| | - Maria L Couce
- Hospital Clínico Universitario de Santiago de Compostela, Instituto de Investigación Sanitaria de Santiago de Compostela (IDIS), MetabERN, Santiago de Compostela, Spain
| | - Anibh M Das
- Department of Paediatrics, Hannover Medical School, Hannover, Germany
| | - Corinne de Laet
- Nutrition and Metabolism Unit, Department of Paediatrics, Hôpital Universitaire des Enfants Reine Fabiola, Brussels, Belgium
| | - Carlo Dionisi-Vici
- Division of Metabolism, Bambino Gesù Children's Hospital Instituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Rome, Italy
| | - Allan M Lund
- Centre for Inherited Metabolic Diseases, Departments of Paediatrics and Clinical Genetics, Copenhagen University Hospital, Copenhagen, Denmark
| | - Manuel Schiff
- Necker Hospital, AP-HP, Reference Centre for Inborn Error of Metabolism (Filière G2M), Paediatrics Department, University of Paris, Paris, France; Inserm UMR_S1163, Institut Imagine, Paris, France
| | - Marco Spada
- Department of Paediatrics, Regina Margherita Children Hospital, University of Torino, Torino, Italy
| | - Erik Sparve
- Swedish Orphan Biovitrum (Sobi), Stockholm, Sweden
| | | | - Roshni Vara
- Department of Paediatric Inherited Metabolic Disease, Evelina London Children's Hospital, London, UK
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13
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Barone H, Bliksrud YT, Elgen IB, Szigetvari PD, Kleppe R, Ghorbani S, Hansen EV, Haavik J. Tyrosinemia Type 1 and symptoms of ADHD: Biochemical mechanisms and implications for treatment and prognosis. Am J Med Genet B Neuropsychiatr Genet 2020; 183:95-105. [PMID: 31633311 DOI: 10.1002/ajmg.b.32764] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 08/25/2019] [Accepted: 09/17/2019] [Indexed: 12/20/2022]
Abstract
Hereditary tyrosinemia Type 1 (HT-1) is a rare metabolic disease where the enzyme catalyzing the final step of tyrosine breakdown is defect, leading to accumulation of toxic metabolites. Nitisinone inhibits the degradation of tyrosine and thereby the production of harmful metabolites, however, the concentration of tyrosine also increases. We investigated the relationship between plasma tyrosine concentrations and cognitive functions and how tyrosine levels affected enzyme activities of human tyrosine hydroxylase (TH) and tryptophan hydroxylase 2 (TPH2). Eight Norwegian children between 6 and 18 years with HT-1 were assessed using questionnaires measuring Attention Deficit Hyperactivity Disorder (ADHD)-symptoms and executive functioning. Recent and past levels of tyrosine were measured and the enzyme activities of TH and TPH2 were studied at conditions replicating normal and pathological tyrosine concentrations. We observed a significant positive correlation between mean tyrosine levels and inattention symptoms. While TH exhibited prominent substrate inhibition kinetics, TPH2 activity also decreased at elevated tyrosine levels. Inhibition of both enzymes may impair syntheses of dopamine, noradrenaline, and serotonin in brain tissue. Inattention in treated HT-1 patients may be related to decreased production of these monoamines. Our results support recommendations of strict guidelines on plasma tyrosine levels in HT-1. ADHD-related deficits, particularly inattention, should be monitored in HT-1 patients to determine whether intervention is necessary.
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Affiliation(s)
- Helene Barone
- Department of Child and Adolescent Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Yngve T Bliksrud
- Department of Medical Biochemistry, Oslo University Hospital, Oslo, Norway
| | - Irene B Elgen
- Department of Child and Adolescent Psychiatry, Haukeland University Hospital, Bergen, Norway
| | | | - Rune Kleppe
- Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
| | - Sadaf Ghorbani
- Department of Biomedicine, University of Bergen, Bergen, Norway
| | - Eirik V Hansen
- Department of Pediatrics, Haukeland University Hospital, Bergen, Norway
| | - Jan Haavik
- Department of Biomedicine, University of Bergen, Bergen, Norway.,Division of Psychiatry, Haukeland University Hospital, Bergen, Norway
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van Ginkel WG, Rodenburg IL, Harding CO, Hollak CEM, Heiner-Fokkema MR, van Spronsen FJ. Long-Term Outcomes and Practical Considerations in the Pharmacological Management of Tyrosinemia Type 1. Paediatr Drugs 2019; 21:413-426. [PMID: 31667718 PMCID: PMC6885500 DOI: 10.1007/s40272-019-00364-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Tyrosinemia type 1 (TT1) is a rare metabolic disease caused by a defect in tyrosine catabolism. TT1 is clinically characterized by acute liver failure, development of hepatocellular carcinoma, renal and neurological problems, and consequently an extremely poor outcome. This review showed that the introduction of 2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione (NTBC) in 1992 has revolutionized the outcome of TT1 patients, especially when started pre-clinically. If started early, NTBC can prevent liver failure, renal problems, and neurological attacks and decrease the risk for hepatocellular carcinoma. NTBC has been shown to be safe and well tolerated, although the long-term effectiveness of treatment with NTBC needs to be awaited. The high tyrosine concentrations caused by treatment with NTBC could result in ophthalmological and skin problems and requires life-long dietary restriction of tyrosine and its precursor phenylalanine, which could be strenuous to adhere to. In addition, neurocognitive problems have been reported since the introduction of NTBC, with hypothesized but as yet unproven pathophysiological mechanisms. Further research should be done to investigate the possible relationship between important clinical outcomes and blood concentrations of biochemical parameters such as phenylalanine, tyrosine, succinylacetone, and NTBC, and to develop clear guidelines for treatment and follow-up with reliable measurements. This all in order to ultimately improve the combined NTBC and dietary treatment and limit possible complications such as hepatocellular carcinoma development, neurocognitive problems, and impaired quality of life.
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Affiliation(s)
- Willem G van Ginkel
- Department of Metabolic Diseases, Beatrix Children's Hospital, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands
| | - Iris L Rodenburg
- Department of Dietetics, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Cary O Harding
- Department of Molecular and Medical Genetics, Oregon Health & Science University, Portland, USA
| | - Carla E M Hollak
- Deparment of Endocrinology and Metabolism, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - M Rebecca Heiner-Fokkema
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands
| | - Francjan J van Spronsen
- Department of Metabolic Diseases, Beatrix Children's Hospital, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands.
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15
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Dysregulated Choline, Methionine, and Aromatic Amino Acid Metabolism in Patients with Wilson Disease: Exploratory Metabolomic Profiling and Implications for Hepatic and Neurologic Phenotypes. Int J Mol Sci 2019; 20:ijms20235937. [PMID: 31779102 PMCID: PMC6928853 DOI: 10.3390/ijms20235937] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 11/22/2019] [Accepted: 11/23/2019] [Indexed: 02/07/2023] Open
Abstract
Wilson disease (WD) is a genetic copper overload condition characterized by hepatic and neuropsychiatric symptoms with a not well-understood pathogenesis. Dysregulated methionine cycle is reported in animal models of WD, though not verified in humans. Choline is essential for lipid and methionine metabolism. Defects in neurotransmitters as acetylcholine, and biogenic amines are reported in WD; however, less is known about their circulating precursors. We aimed to study choline, methionine, aromatic amino acids, and phospholipids in serum of WD subjects. Hydrophilic interaction chromatography-quadrupole time-of-flight mass spectrometry was employed to profile serum of WD subjects categorized as hepatic, neurologic, and pre-clinical. Hepatic transcript levels of genes related to choline and methionine metabolism were verified in the Jackson Laboratory toxic milk mouse model of WD (tx-j). Compared to healthy subjects, choline, methionine, ornithine, proline, phenylalanine, tyrosine, and histidine were significantly elevated in WD, with marked alterations in phosphatidylcholines and reductions in sphingosine-1-phosphate, sphingomyelins, and acylcarnitines. In tx-j mice, choline, methionine, and phosphatidylcholine were similarly dysregulated. Elevated choline is a hallmark dysregulation in WD interconnected with alterations in methionine and phospholipid metabolism, which are relevant to hepatic steatosis. The elevated phenylalanine, tyrosine, and histidine carry implications for neurologic manifestations and are worth further investigation.
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16
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van Ginkel WG, van Reemst HE, Kienstra NS, Daly A, Rodenburg IL, MacDonald A, Burgerhof JG, de Blaauw P, van de Krogt J, Santra S, Heiner-Fokkema MR, van Spronsen FJ. The Effect of Various Doses of Phenylalanine Supplementation on Blood Phenylalanine and Tyrosine Concentrations in Tyrosinemia Type 1 Patients. Nutrients 2019; 11:nu11112816. [PMID: 31752110 PMCID: PMC6893509 DOI: 10.3390/nu11112816] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 11/12/2019] [Accepted: 11/15/2019] [Indexed: 01/08/2023] Open
Abstract
Tyrosinemia type 1 (TT1) treatment with 2-(2-nitro-4-trifluormethyl-benzyl)-1,3-cyclohexanedione (NTBC) and a phenylalanine-tyrosine restricted diet is associated with low phenylalanine concentrations. Phenylalanine supplementation is prescribed without comprehensive consideration about its effect on metabolic control. We investigated the effect of phenylalanine supplementation on bloodspot phenylalanine, tyrosine, NTBC and succinylacetone. Eleven TT1 patients received 0, 20 and 40 mg/kg/day phenylalanine supplementation with the phenylalanine-tyrosine free L-amino acid supplements. Bloodspots were collected before breakfast, midday and evening meal. Differences between study periods, sample times and days within a study period were studied using (generalized) linear mixed model analyses. Twenty and 40 mg/kg/day phenylalanine supplementation prevented daytime phenylalanine decreases (p = 0.05) and most low phenylalanine concentrations, while tyrosine concentrations increased (p < 0.001). Furthermore, NTBC and succinylacetone concentrations did not differ between study periods. To conclude, 20 mg/kg/day phenylalanine supplementation can prevent most low phenylalanine concentrations without increasing tyrosine to concentrations above the target range or influencing NTBC and succinylacetone concentrations, while 40 mg/kg/day increased tyrosine concentrations to values above the targeted range. Additionally, this study showed that the effect of phenylalanine supplementation, and a possible phenylalanine deficiency, should be assessed using pre-midday meal blood samples that could be combined with an overnight fasted sample when in doubt.
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Affiliation(s)
- Willem G. van Ginkel
- Department of Metabolic Diseases, Beatrix Children’s Hospital, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (W.G.v.G.); (H.E.v.R.); (N.S.K.)
| | - Hannah E. van Reemst
- Department of Metabolic Diseases, Beatrix Children’s Hospital, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (W.G.v.G.); (H.E.v.R.); (N.S.K.)
| | - Nienke S. Kienstra
- Department of Metabolic Diseases, Beatrix Children’s Hospital, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (W.G.v.G.); (H.E.v.R.); (N.S.K.)
| | - Anne Daly
- Department of Metabolic Diseases, Birmingham Children’s Hospital, Birmingham B4 6NH, UK; (A.D.); (A.M.); (S.S.)
| | - Iris L. Rodenburg
- Department of Dietetics, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands;
| | - Anita MacDonald
- Department of Metabolic Diseases, Birmingham Children’s Hospital, Birmingham B4 6NH, UK; (A.D.); (A.M.); (S.S.)
| | - Johannes G.M. Burgerhof
- Department of Epidemiology, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands;
| | - Pim de Blaauw
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (P.d.B.); (J.v.d.K.); (M.R.H.-F.)
| | - Jennifer van de Krogt
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (P.d.B.); (J.v.d.K.); (M.R.H.-F.)
| | - Saikat Santra
- Department of Metabolic Diseases, Birmingham Children’s Hospital, Birmingham B4 6NH, UK; (A.D.); (A.M.); (S.S.)
| | - M. Rebecca Heiner-Fokkema
- Department of Laboratory Medicine, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (P.d.B.); (J.v.d.K.); (M.R.H.-F.)
| | - Francjan J. van Spronsen
- Department of Metabolic Diseases, Beatrix Children’s Hospital, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands; (W.G.v.G.); (H.E.v.R.); (N.S.K.)
- Correspondence: ; Tel.: +31-(0)361-4147
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Blood and Brain Biochemistry and Behaviour in NTBC and Dietary Treated Tyrosinemia Type 1 Mice. Nutrients 2019; 11:nu11102486. [PMID: 31623189 PMCID: PMC6836052 DOI: 10.3390/nu11102486] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Revised: 10/11/2019] [Accepted: 10/14/2019] [Indexed: 02/05/2023] Open
Abstract
Tyrosinemia type 1 (TT1) is a rare metabolic disease caused by a defect in the tyrosine degradation pathway. Neurocognitive deficiencies have been described in TT1 patients, that have, among others, been related to changes in plasma large neutral amino acids (LNAA) that could result in changes in brain LNAA and neurotransmitter concentrations. Therefore, this project aimed to investigate plasma and brain LNAA, brain neurotransmitter concentrations and behavior in C57 Bl/6 fumarylacetoacetate hydrolase deficient (FAH−/−) mice treated with 2-(2-nitro-4-trifluoromethylbenoyl)-1,3-cyclohexanedione (NTBC) and/or diet and wild-type mice. Plasma and brain tyrosine concentrations were clearly increased in all NTBC treated animals, even with diet (p < 0.001). Plasma and brain phenylalanine concentrations tended to be lower in all FAH−/− mice. Other brain LNAA, were often slightly lower in NTBC treated FAH−/− mice. Brain neurotransmitter concentrations were usually within a normal range, although serotonin was negatively correlated with brain tyrosine concentrations (p < 0.001). No clear behavioral differences between the different groups of mice could be found. To conclude, this is the first study measuring plasma and brain biochemistry in FAH−/− mice. Clear changes in plasma and brain LNAA have been shown. Further research should be done to relate the biochemical changes to neurocognitive impairments in TT1 patients.
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Tissue-specific FAH deficiency alters sleep-wake patterns and results in chronic tyrosinemia in mice. Proc Natl Acad Sci U S A 2019; 116:22229-22236. [PMID: 31611405 DOI: 10.1073/pnas.1904485116] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Fumarylacetoacetate hydrolase (FAH) is the last enzyme in tyrosine catabolism, and mutations in the FAH gene are associated with hereditary tyrosinemia type I (HT1 or TYRSN1) in humans. In a behavioral screen of N-ethyl-N-nitrosourea mutagenized mice we identified a mutant line which we named "swingshift" (swst, MGI:3611216) with a nonsynonymous point mutation (N68S) in Fah that caused age-dependent disruption of sleep-wake patterns. Mice homozygous for the mutation had an earlier onset of activity (several hours before lights off) and a reduction in total activity and body weight when compared with wild-type or heterozygous mice. Despite abnormal behavioral entrainment to light-dark cycles, there were no differences in the period or phase of the central clock in mutant mice, indicating a defect downstream of the suprachiasmatic nucleus. Interestingly, these behavioral phenotypes became milder as the mice grew older and were completely rescued by the administration of NTBC [2-(2-nitro-4-trifluoromethylbenzoyl)-1,3-cyclohexanedione], an inhibitor of 4-hydroxyphenylpyruvate dioxygenase, which is upstream of FAH. Mechanistically, the swst mutation had no effect on the enzymatic activity of FAH, but rather promoted the degradation of the mutant protein. This led to reduced FAH protein levels and enzymatic activity in the liver and kidney (but not the brain or fibroblasts) of homozygous mice. In addition, plasma tyrosine-but not methionine, phenylalanine, or succinylacetone-increased in homozygous mice, suggesting that swst mutants provide a model of mild, chronic HT1.
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Couce ML, Sánchez-Pintos P, Aldámiz-Echevarría L, Vitoria I, Navas V, Martín-Hernández E, García-Volpe C, Pintos G, Peña-Quintana L, Hernández T, Gil D, Sánchez-Valverde F, Bueno M, Roca I, López-Ruzafa E, Díaz-Fernández C. Evolution of tyrosinemia type 1 disease in patients treated with nitisinone in Spain. Medicine (Baltimore) 2019; 98:e17303. [PMID: 31574857 PMCID: PMC6775438 DOI: 10.1097/md.0000000000017303] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 07/19/2019] [Accepted: 08/27/2019] [Indexed: 01/01/2023] Open
Abstract
Treatment with nitisinone (NTBC) has brought about a drastic improvement in the treatment and prognosis of hereditary tyrosinemia type I (HT1). We conducted a retrospective observational multicentric study in Spanish HT1 patients treated with NTBC to assess clinical and biochemical long-term evolution.We evaluated 52 patients, 7 adults and 45 children, treated with NTBC considering: age at diagnosis, diagnosis by clinical symptoms, or by newborn screening (NBS); phenotype (acute/subacute/chronic), mutational analysis; symptoms at diagnosis and clinical course; biochemical markers; doses of NTBC; treatment adherence; anthropometric evolution; and neurocognitive outcome.The average follow-up period was 6.1 ± 4.9 and 10.6 ± 5.4 years in patients with early and late diagnosis respectively. All patients received NTBC from diagnosis with an average dose of 0.82 mg/kg/d. All NBS-patients (n = 8) were asymptomatic at diagnosis except 1 case with acute liver failure, and all remain free of liver and renal disease in follow-up. Liver and renal affectation was markedly more frequent at diagnosis in patients with late diagnosis (P < .001 and .03, respectively), with ulterior positive hepatic and renal course in 86.4% and 93.2% of no-NBS patients, although 1 patient with good metabolic control developed hepatocarcinoma.Despite a satisfactory global nutritional evolution, 46.1% of patients showed overweight/obesity. Interestingly lower body mass index was observed in patients with good dietary adherence (20.40 ± 4.43 vs 24.30 ± 6.10; P = .08) and those with good pharmacological adherence (21.19 ± 4.68 vs 28.58 ± 213.79).intellectual quotient was ≥85 in all NBS- and 68.75% of late diagnosis cases evaluated, 15% of which need pedagogical support, and 6.8% (3/44) showed school failure.Among the 12 variants identified in fumarylacetoacetate hydrolase gene, 1 of them novel (H63D), the most prevalent in Spanish population is c.554-1 G>T.After NTBC treatment a reduction in tyrosine and alpha-fetoprotein levels was observed in all the study groups, significant for alpha-fetoprotein in no NBS-group (P = .03), especially in subacute/chronic forms (P = .018).This series confirms that NTBC treatment had clearly improved the prognosis and quality of life of HT1 patients, but it also shows frequent cognitive dysfunctions and learning difficulties in medium-term follow-up, and, in a novel way, a high percentage of overweight/obesity.
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Affiliation(s)
- María Luz Couce
- Unit of Diagnosis and Treatment of Congenital Metabolic Diseases, S. Neonatology, Department of Pediatrics, Clínico Universitario de Santiago de Compostela, CIBERER, Health Research Institute of Santiago de Compostela (IDIS)
| | - Paula Sánchez-Pintos
- Unit of Diagnosis and Treatment of Congenital Metabolic Diseases, S. Neonatology, Department of Pediatrics, Clínico Universitario de Santiago de Compostela, CIBERER, Health Research Institute of Santiago de Compostela (IDIS)
| | - Luís Aldámiz-Echevarría
- Unit of Metabolism, Department of Pediatrics, Hospital de Cruces, Group of Metabolism, Biocruces Health Research Institute, CIBERER
| | | | - Victor Navas
- Pediatric Gastroenterology and Nutrition Unit Hospital Carlos Haya, Málaga
| | | | - Camila García-Volpe
- Pediatric Gastroenterology, Hepatology and Nutrition Unit, H. San Joan de Deu, Barcelona
| | | | - Luis Peña-Quintana
- Gastroenterology and Nutrition Unit Complejo Hospitalario Universitario Insular-Materno Infantil, CIBEROBN, Las Palmas de Gran Canaria University, Las Palmas
| | | | - David Gil
- Pediatric Gastroenterology, Hepatology and Nutrition Unit Hospital Virgen da Arrixaca, Murcia
| | | | - María Bueno
- Metabolic Congenital Diseases Unit, Hospital Virgen del Rocío, Sevilla
| | - Iria Roca
- Unit of Diagnosis and Treatment of Congenital Metabolic Diseases, S. Neonatology, Department of Pediatrics, Clínico Universitario de Santiago de Compostela, CIBERER, Health Research Institute of Santiago de Compostela (IDIS)
| | | | - Carmen Díaz-Fernández
- Unit of Hepatology and Infantile Hepatic Transplantation, Hospital Universitario La Paz, Madrid, Spain
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20
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Davison AS, Norman BP, Ross GA, Hughes AT, Khedr M, Milan AM, Gallagher JA, Ranganath LR. Evaluation of the serum metabolome of patients with alkaptonuria before and after two years of treatment with nitisinone using LC-QTOF-MS. JIMD Rep 2019; 48:67-74. [PMID: 31392115 PMCID: PMC6606987 DOI: 10.1002/jmd2.12042] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 04/26/2019] [Accepted: 05/02/2019] [Indexed: 01/03/2023] Open
Abstract
BACKGROUND The homogentisic acid-lowering therapy nitisinone is being evaluated for the treatment of alkaptonuria (AKU) at the National Centre for AKU. Beyond hypertyrosinemia, the wider metabolic consequences of its use are largely unknown. The aim of this work was to evaluate the impact of nitisinone on the serum metabolome of patients with AKU after 12 and 24 months of treatment. METHODS Deproteinized serum from 25 patients with AKU (mean age[±SD] 51.1 ± 14.9 years, 12 male) was analyzed using the 1290 Infinity II liquid chromatography system coupled to a 6550 quadrupole time-of-flight mass spectrometry (Agilent, UK). Raw data were processed using a batch targeted feature extraction algorithm and an accurate mass retention time database containing 469 intermediary metabolites (MW 72-785). Matched entities (±10 ppm theoretical accurate mass and ±0.3 minutes retention time window) were filtered based on their frequency and variability (<25% CV) in group quality control samples, and repeated measures statistical significance analysis with Benjamini-Hochberg false discovery rate adjustment was used to assess changes in metabolite abundance. RESULTS Eight metabolites increased in abundance (log2 fold change [FC] 2.1-15.2, P < .05); 7 of 8 entities were related to tyrosine metabolism, and 13 decreased in abundance (log2 FC 1.5-15.5, P < .05); including entities related to tyrosine (n = 2), tryptophan (n = 3), xanthine (n = 2), and citric acid cycle metabolism (n = 2). CONCLUSIONS Evaluation of the serum metabolome of patients with AKU showed a significant difference in the abundance of several metabolites following treatment with nitisinone, including a number that have not been previously reported; several of these were not related to the tyrosine metabolic pathway. SYNOPSIS Nitisinone therapy has a significant impact on several metabolites beyond the tyrosine metabolic pathway, several of which appear to be related to the redox state of the cell.
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Affiliation(s)
- Andrew S. Davison
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical LaboratoriesRoyal Liverpool University Hospitals TrustLiverpoolUK
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | - Brendan P. Norman
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | | | - Andrew T. Hughes
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical LaboratoriesRoyal Liverpool University Hospitals TrustLiverpoolUK
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | - Milad Khedr
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical LaboratoriesRoyal Liverpool University Hospitals TrustLiverpoolUK
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | - Anna M. Milan
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical LaboratoriesRoyal Liverpool University Hospitals TrustLiverpoolUK
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | - James A. Gallagher
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
| | - Lakshminarayan R. Ranganath
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical LaboratoriesRoyal Liverpool University Hospitals TrustLiverpoolUK
- Musculoskeletal Biology I, Institute of Ageing and Chronic DiseaseUniversity of Liverpool, Liverpool Health PartnersLiverpoolUK
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Davison AS, Strittmatter N, Sutherland H, Hughes AT, Hughes J, Bou-Gharios G, Milan AM, Goodwin RJA, Ranganath LR, Gallagher JA. Assessing the effect of nitisinone induced hypertyrosinaemia on monoamine neurotransmitters in brain tissue from a murine model of alkaptonuria using mass spectrometry imaging. Metabolomics 2019; 15:68. [PMID: 31037385 PMCID: PMC6488549 DOI: 10.1007/s11306-019-1531-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Accepted: 04/19/2019] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Nitisinone induced hypertyrosinaemia is a concern in patients with Alkaptonuria (AKU). It has been suggested that this may alter neurotransmitter metabolism, specifically dopamine and serotonin. Herein mass spectrometry imaging (MSI) is used for the direct measurement of 2,4-diphenyl-pyranylium tetrafluoroborate (DPP-TFB) derivatives of monoamine neurotransmitters in brain tissue from a murine model of AKU following treatment with nitisinone. METHODS Metabolite changes were assessed using MSI on DPP-TFB derivatised fresh frozen tissue sections directing analysis towards primary amine neurotransmitters. Matched tail bleed plasma samples were analysed using LC-MS/MS. Eighteen BALB/c mice were included in this study: HGD-/- (n = 6, treated with nitisinone-4 mg/L, in drinking water); HGD-/- (n = 6, no treatment) and HGD+/- (n = 6, no treatment). RESULTS Ion intensity and distribution of DPP-TFB derivatives in brain tissue for dopamine, 3-methoxytyramine, noradrenaline, tryptophan, serotonin, and glutamate were not significantly different following treatment with nitisinone in HGD -/- mice, and no significant differences were observed between HGD-/- and HGD+/- mice that received no treatment. Tyrosine (10-fold in both comparisons, p = 0.003; [BALB/c HGD-/- (n = 6) and BALB/c HGD+/- (n = 6) (no treatment) vs. BALB/c HGD-/- (n = 6, treated)] and tyramine (25-fold, p = 0.02; 32-fold, p = 0.02) increased significantly following treatment with nitisinone. Plasma tyrosine and homogentisic acid increased (ninefold, p = < 0.0001) and decreased (ninefold, p = 0.004), respectively in HGD-/- mice treated with nitisinone. CONCLUSIONS Monoamine neurotransmitters in brain tissue from a murine model of AKU did not change following treatment with nitisinone. These findings have significant implications for patients with AKU as they suggest monoamine neurotransmitters are not altered following treatment with nitisinone.
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Affiliation(s)
- A S Davison
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool, L7 8XP, UK.
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK.
| | - N Strittmatter
- Pathology, Drug Safety and Metabolism, IMED Biotech Unit, AstraZeneca, Cambridge, UK
| | - H Sutherland
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - A T Hughes
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool, L7 8XP, UK
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - J Hughes
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - G Bou-Gharios
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - A M Milan
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool, L7 8XP, UK
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - R J A Goodwin
- Pathology, Drug Safety and Metabolism, IMED Biotech Unit, AstraZeneca, Cambridge, UK
| | - L R Ranganath
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool, L7 8XP, UK
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
| | - J A Gallagher
- Musculoskeletal Biology I, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool Health Partners, Liverpool, UK
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Davison AS, Harrold JA, Hughes G, Norman BP, Devine J, Usher J, Hughes AT, Khedr M, Gallagher JA, Milan AM, J C G H, Ranganath LR. Clinical and biochemical assessment of depressive symptoms in patients with Alkaptonuria before and after two years of treatment with nitisinone. Mol Genet Metab 2018; 125:135-143. [PMID: 30049652 DOI: 10.1016/j.ymgme.2018.07.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 07/18/2018] [Accepted: 07/18/2018] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Concerns exist over hypertyrosinaemia that is observed following treatment with nitisinone. It has been suggested that tyrosine may compete with tryptophan for uptake into the central nervous system, and or inhibit tryptophan hydroxylase activity reducing serotonin production. At the National Alkaptonuria (AKU) Centre nitisinone is being used off-licence to treat AKU, and there is uncertainty over whether hypertyrosinaemia may alter mood. Herein results from clinical and biochemical assessments of depression in patients with AKU before and after treatment with nitisinone are presented. PATIENTS AND METHODS 63 patients were included pre-nitisinone treatment, of these 39 and 32 patients were followed up 12 and 24 months after treatment. All patients had Becks Depression Inventory-II (BDI-II) assessments (scores can range from 0 to 63, the higher the score the more severe the category of depression), and where possible urinary monoamine neurotransmitter metabolites and serum aromatic amino acids were measured as biochemical markers of depression. RESULTS Mean (±standard deviation) BDI-II scores pre-nitisinone, and after 12 and 24 months were 10.1(9.6); 9.8(10.0) and 10.5(9.9) (p ≥ 0.05, all visits). Paired scores (n = 32), showed a significant increase at 24 months compared to baseline 10.5(9.9) vs. 8.6 (7.8) (p = 0.03). Serum tyrosine increased at least 6-fold following nitisinone (p ≤ 0.0001, all visits), and urinary 3-methoxytyramine (3-MT) increased at 12 and 24 months (p ≤ 0.0001), and 5-hydroxyindole acetic acid (5-HIAA) decreased at 12 months (p = 0.03). CONCLUSIONS BDI-II scores were significantly higher following 24 months of nitisinone therapy in patients that were followed up, however the majority of these patients remained in the minimal category of depression. Serum tyrosine and urinary 3-MT increased significantly following treatment with nitisinone. In contrast urinary 5-HIAA did not decrease consistently over the same period studied. Together these findings suggest nitisinone does not cause depression despite some observed effects on monoamine neurotransmitter metabolism.
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Affiliation(s)
- A S Davison
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK; Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK.
| | - J A Harrold
- Department of Psychological Sciences, University of Liverpool, Liverpool L69 7ZA, UK
| | - G Hughes
- Department of Psychological Sciences, University of Liverpool, Liverpool L69 7ZA, UK
| | - B P Norman
- Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
| | - J Devine
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK
| | - J Usher
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK
| | - A T Hughes
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK; Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
| | - M Khedr
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK; Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
| | - J A Gallagher
- Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
| | - A M Milan
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK; Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
| | - Halford J C G
- Department of Psychological Sciences, University of Liverpool, Liverpool L69 7ZA, UK
| | - L R Ranganath
- Department of Clinical Biochemistry and Metabolic Medicine, Liverpool Clinical Laboratories, Royal Liverpool University Hospitals Trust, Liverpool L7 8XP, UK; Institute of Ageing and Chronic Disease, Musculoskeletal Biology, University of Liverpool, Liverpool L69 3GA, UK
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23
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Davison AS, Norman BP, Smith EA, Devine J, Usher J, Hughes AT, Khedr M, Milan AM, Gallagher JA, Ranganath LR. Serum Amino Acid Profiling in Patients with Alkaptonuria Before and After Treatment with Nitisinone. JIMD Rep 2018; 41:109-117. [PMID: 29754208 DOI: 10.1007/8904_2018_109] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 03/28/2018] [Accepted: 04/13/2018] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Alkaptonuria (AKU) is a rare inherited disorder of the tyrosine metabolic pathway. Our group is evaluating the use of the homogentisic acid-lowering agent nitisinone in patients with AKU. A major biochemical consequence of this treatment is hypertyrosinaemia. Herein we report the concentration of 20 serum amino acids over a 36-month period pre- and post-treatment with nitisinone. METHODS Fasting serum samples were collected at baseline (pre-nitisinone), 3 (2 mg nitisinone every other day), 6, 12, 24 and 36 (2 mg nitisinone daily) months. Amino acids were measured using the Biochrom 30 high-performance liquid chromatography cation exchange system with ninhydrin detection. RESULTS Fifty patients [21 female, mean age (±standard deviation) 54.1 (15.6) years (range 25-75); 29 male, mean age 49.3 (11.6) years (range 22-70 years)] were included. Following treatment mean tyrosine concentrations increased seven- to eight-fold (baseline, 69.8 μmol/L; 3 months, 670.7 μmol/L; 6 months, 666.4 μmol/L; 12 months, 692.9 μmol/L; 24 months, 649.4 μmol/L; 36 months, 724.8 μmol/L, p = <0.001 for all visits compared to baseline).At baseline mean phenylalanine, aspartic acid and arginine were outside the normal reference range. Following treatment the ratios of phenylalanine/tyrosine, phenylalanine/large neutral amino acids, arginine/branched chain amino acids and branched chain/aromatic amino acids decreased (p = <0.05), and the tyrosine/large neutral amino acid ratio increased (p = <0.0001). CONCLUSIONS Marked hypertyrosinaemia was observed following treatment with nitisinone. Noteworthy changes were also observed in the ratio of several amino acids following treatment with nitisinone suggesting that the availability of amino acids for neurotransmitter biosynthesis and liver function may be altered following treatment with nitisinone.
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Affiliation(s)
- A S Davison
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK.
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK.
| | - B P Norman
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
| | - E A Smith
- Department of Clinical Biochemistry, Alder Hey Children's Hospital, Liverpool, UK
| | - J Devine
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
| | - J Usher
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
| | - A T Hughes
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
| | - M Khedr
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
| | - A M Milan
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
| | - J A Gallagher
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
| | - L R Ranganath
- Liverpool Clinical Laboratories, Department of Clinical Biochemistry and Metabolic Medicine, Royal Liverpool University Hospitals Trust, Liverpool, UK
- Bone and Joint Research Group, Musculoskeletal Biology, University of Liverpool, Liverpool, UK
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Yang H, Rossignol F, Cyr D, Laframboise R, Wang SP, Soucy JF, Berthier MT, Giguère Y, Waters PJ, Mitchell GA. Mildly elevated succinylacetone and normal liver function in compound heterozygotes with pathogenic and pseudodeficient FAH alleles. Mol Genet Metab Rep 2017; 14:55-58. [PMID: 29326876 PMCID: PMC5758842 DOI: 10.1016/j.ymgmr.2017.12.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Accepted: 12/13/2017] [Indexed: 12/27/2022] Open
Abstract
Background A high level of succinylacetone (SA) in blood is a sensitive, specific marker for the screening and diagnosis of hepatorenal tyrosinemia (HT1, MIM 276700). HT1 is caused by mutations in the FAH gene, resulting in deficiency of fumarylacetoacetate hydrolase. HT1 newborns are usually clinically asymptomatic, but have coagulation abnormalities revealing liver dysfunction. Treatment with nitisinone (NTBC) plus dietary restriction of tyrosine and phenylalanine prevents the complications of HT1 Observations Two newborns screened positive for SA but had normal coagulation testing. Plasma and urine SA levels were 3–5 fold above the reference range but were markedly lower than in typical HT1. Neither individual received nitisinone or dietary therapy. They remain clinically normal, currently aged 9 and 15 years. Each was a compound heterozygote, having a splicing variant in trans with a prevalent “pseudodeficient” FAH allele, c.1021C > T (p.Arg341Trp), which confers partial FAH activity. All newborns identified with mild hypersuccinylacetonemia in Québec have had genetic deficiencies of tyrosine degradation: either deficiency of the enzyme preceding FAH, maleylacetoacetate isomerase, or partial deficiency of FAH itself. Conclusion Compound heterozygotes for c.1021C > T (p.Arg341Trp) and a severely deficient FAH allele have mild hypersuccinylacetonemia and to date they have remained asymptomatic without treatment. It is important to determine the long term outcome of such individuals.
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Affiliation(s)
- Hao Yang
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada
| | - Francis Rossignol
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada
| | - Denis Cyr
- Service de Génétique médicale, Département de Pédiatrie, Centre hospitalier universitaire de Sherbrooke (CHUS), Sherbrooke, Québec, Canada
| | - Rachel Laframboise
- Service de Génétique médicale, Département de Pédiatrie, CHU de Québec-Centre hospitalier de l'Université Laval (CHUL), Québec, Canada
| | - Shu Pei Wang
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada
| | - Jean-François Soucy
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada
| | - Marie-Thérèse Berthier
- Programme québécois de Dépistage Néonatal Sanguin, CHU de Québec-Université Laval, Québec, Canada
| | - Yves Giguère
- Programme québécois de Dépistage Néonatal Sanguin, CHU de Québec-Université Laval, Québec, Canada
| | - Paula J. Waters
- Service de Génétique médicale, Département de Pédiatrie, Centre hospitalier universitaire de Sherbrooke (CHUS), Sherbrooke, Québec, Canada
- Corresponding authors.
| | - Grant A. Mitchell
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada
- Corresponding authors.
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