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Hyperammonemia in Review: Pathophysiology, Diagnosis, and Treatment
Pediatr Nephrol DOI 10.1007/s00467-011-1838-5 EDUCATIONAL REVIEW Hyperammonemia in review: pathophysiology, diagnosis, and treatment Ari Auron & Patrick D. Brophy Received: 23 September 2010 /Revised: 9 January 2011 /Accepted: 12 January 2011 # IPNA 2011 Abstract Ammonia is an important source of nitrogen and is the breakdown and catabolism of dietary and bodily proteins, required for amino acid synthesis. It is also necessary for respectively. In healthy individuals, amino acids that are not normal acid-base balance. When present in high concentra- needed for protein synthesis are metabolized in various tions, ammonia is toxic. Endogenous ammonia intoxication chemical pathways, with the rest of the nitrogen waste being can occur when there is impaired capacity of the body to converted to urea. Ammonia is important for normal animal excrete nitrogenous waste, as seen with congenital enzymatic acid-base balance. During exercise, ammonia is produced in deficiencies. A variety of environmental causes and medica- skeletal muscle from deamination of adenosine monophos- tions may also lead to ammonia toxicity. Hyperammonemia phate and amino acid catabolism. In the brain, the latter refers to a clinical condition associated with elevated processes plus the activity of glutamate dehydrogenase ammonia levels manifested by a variety of symptoms and mediate ammonia production. After formation of ammonium signs, including significant central nervous system (CNS) from glutamine, α-ketoglutarate, a byproduct, may be abnormalities. Appropriate and timely management requires a degraded to produce two molecules of bicarbonate, which solid understanding of the fundamental pathophysiology, are then available to buffer acids produced by dietary sources. differential diagnosis, and treatment approaches available. -
Newborn Screening Laboratory Manual of Services
Newborn Screening Laboratory Manual of Services Test Panel: Please see the following links for a detailed description of testing in the Newborn Screening section. Information about the Newborn Screening program is available here. Endocrine Disorders Congenital adrenal hyperplasia (CAH) Congenital hypothyroidism (TSH) Hemoglobinopathies Sickle cell disease (FS) Alpha (Barts) Sickle βeta Thalassemia (FSA) Other sickling hemoglobinopathies such as: FAS FAC FAD FAE Homozygous conditions such as: FC FD FE Metabolic Disorders Biotinidase deficiency Galactosemia Cystic fibrosis (CF) first tier screening for elevated immunoreactive trypsinogen (IRT) Cystic fibrosis second tier genetic mutation analysis on the top 4% IRT concentrations. Current alleles detected : F508del, I507del, G542X, G85E, R117H, 621+1G->T, 711+1G->T, R334W, R347P, A455E, 1717-1G->A, R560T, R553X, G551D, 1898+1G->A, 2184delA, 2789+5G->A, 3120+1G->A, R1162X, 3659delC, 3849+10kbC->T, W1282X, N1303K, IVS polyT T5/T7/T9 *Currently validating a mutation panel that includes the above alleles in addition to the following: 1078delT, Y122X, 394delTT, R347H, M1101K, S1255X, 1898+5G->T, 2183AA->G, 2307insA, Y1092X, 3876delA, 3905insT, S549N, S549R_1645A->C, S549R-1647T->G, S549R-1647T->G, V520F, A559T, 1677delTA, 2055del9->A, 2143delT, 3199del6, 406-1G->A, 935delA, D1152H, CFTRdele2, E60X, G178R, G330X, K710X, L206W, Q493X, Q890X, R1066C, R1158X, R75X, S1196X, W1089X, G1244E, G1349D, G551S, R560KT, S1251N, S1255P Amino acid disorders Phenylketonuria (PKU) / Hyperphenylalaninemia Maple -
Disorders Included in the Newborn Screening Panel Disorders
Disorders Included in the Newborn Screening Panel Disorders Detected by Tandem Mass Spectrometry Acylcarnitine Profile Amino Acid Profile Fatty Acid Oxidation Disorders Amino Acid Disorders Carnitine/Acylcarnitine Translocase Deficiency Argininemia 1 Carnitine Palmitoyl Transferase Deficiency Type I Argininosuccinic Aciduria 1 3-Hydroxy Long Chain Acyl-CoA Dehydrogenase 5-Oxoprolinuria 1 Deficiency Carbamoylphosphate Synthetase Deficiency 1 2,4-Dienoyl-CoA Reductase Deficiency Citrullinemia Medium Chain Acyl-CoA Dehydrogenase Deficiency Homocystinuria Multiple Acyl-CoA Dehydrogenase Deficiency Hypermethioninemia Neonatal Carnitine Palmitoyl Transferase Deficiency Hyperammonemia, Hyperornithinemia, Homocitrullinuria Type II Syndrome1 1 Short Chain Acyl-CoA Dehydrogenase Deficiency Hyperornithinemia with Gyral Atrophy Short Chain Hydroxy Acyl-CoA Dehydrogenase Maple Syrup Urine Disease Deficiency Phenylketonuria Trifunctional Protein Deficiency Classical/Hyperphenylalaninemia Very Long Chain Acyl-CoA Dehydrogenase Deficiency Biopterin Cofactor Deficiencies Tyrosinemia Organic Acid Disorders Transient Neonatal Tyrosinemia 2 Tyrosinemia Type I 3-Hydroxy-3-Methylglutaryl-CoA Lyase Deficiency Tyrosinemia Type II Glutaric Acidemia Type I Tyrosinemia Type III Isobutyryl-CoA Dehydrogenase Deficiency Isovaleric Acidemia 2-Methylbutyryl-CoA Dehydrogenase Deficiency 3-Methylcrotonyl-CoA Carboxylase Deficiency Other Observations 3-Methylglutaconyl-CoA Hydratase Deficiency Methylmalonic Acidemias Hyperalimentation Methylmalonyl-CoA Mutase Deficiency -
Arginine-Provider-Fact-Sheet.Pdf
Arginine (Urea Cycle Disorder) Screening Fact Sheet for Health Care Providers Newborn Screening Program of the Oklahoma State Department of Health What is the differential diagnosis? Argininemia (arginase deficiency, hyperargininemia) What are the characteristics of argininemia? Disorders of arginine metabolism are included in a larger group of disorders, known as urea cycle disorders. Argininemia is an autosomal recessive inborn error of metabolism caused by a defect in the final step in the urea cycle. Most infants are born to parents who are both unknowingly asymptomatic carriers and have NO known history of a urea cycle disorder in their family. The incidence of all urea cycle disorders is estimated to be about 1:8,000 live births. The true incidence of argininemia is not known, but has been estimated between 1:350,000 and 1:1,000,000. Argininemia is usually asymptomatic in the neonatal period, although it can present with mild to moderate hyperammonemia. Untreated, argininemia usually progresses to severe spasticity, loss of ambulation, severe cognitive and intellectual disabilities and seizures Lifelong treatment includes a special diet, and special care during times of illness or stress. What is the screening methodology for argininemia? 1. An amino acid profile by Tandem Mass Spectrometry (MS/MS) is performed on each filter paper. 2. Arginine is the primary analyte. What is an in-range (normal) screen result for arginine? Arginine less than 100 mol/L is NOT consistent with argininemia. See Table 1. TABLE 1. In-range Arginine Newborn Screening Results What is an out-of-range (abnormal) screen for arginine? Arginine > 100 mol/L requires further testing. -
Novel Insights Into the Pathophysiology of Kidney Disease in Methylmalonic Aciduria
Zurich Open Repository and Archive University of Zurich Main Library Strickhofstrasse 39 CH-8057 Zurich www.zora.uzh.ch Year: 2017 Novel Insights into the Pathophysiology of Kidney Disease in Methylmalonic Aciduria Schumann, Anke Posted at the Zurich Open Repository and Archive, University of Zurich ZORA URL: https://doi.org/10.5167/uzh-148531 Dissertation Published Version Originally published at: Schumann, Anke. Novel Insights into the Pathophysiology of Kidney Disease in Methylmalonic Aciduria. 2017, University of Zurich, Faculty of Medicine. Novel Insights into the Pathophysiology of Kidney Disease in Methylmalonic Aciduria Dissertation zur Erlangung der naturwissenschaftlichen Doktorwürde (Dr. sc. nat.) vorgelegt der Mathematisch-naturwissenschaftlichen Fakultät der Universität Zürich von Anke Schumann aus Deutschland Promotionskommission Prof. Dr. Olivier Devuyst (Vorsitz und Leitung der Dissertation) Prof. Dr. Matthias R. Baumgartner Prof. Dr. Stefan Kölker Zürich, 2017 DECLARATION I hereby declare that the presented work and results are the product of my own work. Contributions of others or sources used for explanations are acknowledged and cited as such. This work was carried out in Zurich under the supervision of Prof. Dr. O. Devuyst and Prof. Dr. M.R. Baumgartner from August 2012 to August 2016. Peer-reviewed publications presented in this work: Haarmann A, Mayr M, Kölker S, Baumgartner ER, Schnierda J, Hopfer H, Devuyst O, Baumgartner MR. Renal involvement in a patient with cobalamin A type (cblA) methylmalonic aciduria: a 42-year follow-up. Mol Genet Metab. 2013 Dec;110(4):472-6. doi: 10.1016/j.ymgme.2013.08.021. Epub 2013 Sep 17. Schumann A, Luciani A, Berquez M, Tokonami N, Debaix H, Forny P, Kölker S, Diomedi Camassei F, CB, MK, Faresse N, Hall A, Ziegler U, Baumgartner M and Devuyst O. -
Disease Reference Book
The Counsyl Foresight™ Carrier Screen 180 Kimball Way | South San Francisco, CA 94080 www.counsyl.com | [email protected] | (888) COUNSYL The Counsyl Foresight Carrier Screen - Disease Reference Book 11-beta-hydroxylase-deficient Congenital Adrenal Hyperplasia .................................................................................................................................................................................... 8 21-hydroxylase-deficient Congenital Adrenal Hyperplasia ...........................................................................................................................................................................................10 6-pyruvoyl-tetrahydropterin Synthase Deficiency ..........................................................................................................................................................................................................12 ABCC8-related Hyperinsulinism........................................................................................................................................................................................................................................ 14 Adenosine Deaminase Deficiency .................................................................................................................................................................................................................................... 16 Alpha Thalassemia............................................................................................................................................................................................................................................................. -
What Disorders Are Screened for by the Newborn Screen?
What disorders are screened for by the newborn screen? Endocrine Disorders The endocrine system is important to regulate the hormones in our bodies. Hormones are special signals sent to various parts of the body. They control many things such as growth and development. The goal of newborn screening is to identify these babies early so that treatment can be started to keep them healthy. To learn more about these specific disorders please click on the name of the disorder below: English: Congenital Adrenal Hyperplasia Esapnol Hiperplasia Suprarrenal Congenital - - http://www.newbornscreening.info/Parents/otherdisorders/CAH.html - http://www.newbornscreening.info/spanish/parent/Other_disorder/CAH.html - Congenital Hypothyroidism (Hipotiroidismo Congénito) - http://www.newbornscreening.info/Parents/otherdisorders/CH.html - http://www.newbornscreening.info/spanish/parent/Other_disorder/CH.html Hematologic Conditions Hemoglobin is a special part of our red blood cells. It is important for carrying oxygen to the parts of the body where it is needed. When people have problems with their hemoglobin they can have intense pain, and they often get sick more than other children. Over time, the lack of oxygen to the body can cause damage to the organs. The goal of newborn screening is to identify babies with these conditions so that they can get early treatment to help keep them healthy. To learn more about these specific disorders click here (XXX). - Sickle Cell Anemia (Anemia de Célula Falciforme) - http://www.newbornscreening.info/Parents/otherdisorders/SCD.html - http://www.newbornscreening.info/spanish/parent/Other_disorder/SCD.html - SC Disease (See Previous Link) - Sickle Beta Thalassemia (See Previous Link) Enzyme Deficiencies Enzymes are special proteins in our body that allow for chemical reactions to take place. -
Standards of Care
Dedicated to a Cure. Committed to Our Community. Infantile Nephropathic Cystinosis STANDARDS OF CARE A Reference for People with Infantile Nephropathic Cystinosis, their Families, and Medical Team Galina Nesterova, MD and William A. Gahl, MD, PhD, National Human Genome Research Institute, National Institutes of Health, Bethesda, Maryland June 2012 Preface The Cystinosis Standards of Care were written to help individuals with infantile nephropathic Cystinosis, their families, and their medical team. The information presented here is intended to add to conversations with physicians and other health care providers. No document can replace individual interactions and advice with respect to treatment. One of our primary goals is to give affected individuals and their families greater confidence in the future. With early diagnosis and appropriate treatment, there is more hope today for families with Cystinosis than ever before. Research has led to better methods of diagnosis and treat- ment. Knowledge is increasing rapidly by virtue of the open sharing of information throughout the world among families, health professionals and the research community. We acknowledge the important contributions to the Standards of Care of Dr. Galina Nesterova and Dr. William Gahl of the National Institutes of Health and the members of the Cystinosis Research Network’s Medical and Scientific Review Boards. Cystinosis Research Network 302 Whytegate Court, Lake Forest, IL 60045 USA Phone: 847-735-0471 Toll Free: 866-276-3669 Fax: 847-235-2773 www.cystinosis.org E-mail: [email protected] The Cystinosis Research Network is an all-volunteer, non-profit organization dedicated to supporting and advocating research, providing family assistance and educating the public and medical communities about Cystinosis. -
L-Cystine, from Non-Animal Source Cell Culture Tested, Meets EP Testing Specifications
L-Cystine, from non-animal source Cell culture tested, meets EP testing specifications Product Number C7602 Store at Room Temperature Product Description Preparation Instructions Molecular Formula: C6H12N2O4S2 This product is soluble in 1 M HCl (100 mg/ml), with Molecular Weight: 240.3 heat as needed. The solubility of cystine in water is CAS Number: 56-89-3 0.112 mg/ml at 25 °C; cystine is more soluble in Synonyms: [R-(R*,R*)] -3,3'-dithiobis[2- aqueous solutions with pH < 2 or pH > 8.1 aminopropanoic acid], dicysteine, b, b'-dithiodialanine1 References This product is tested for endotoxin levels and 1. The Merck Index, 12th ed., Entry# 2851. suitability for cell culture experiments. 2. Textbook of Biochemistry with Clinical Correlations, Devlin, T. M., ed., Wiley-Liss (New Cystine is a derived amino acid that is formed from the York, NY: 1992), pp. 33, 503. oxidative linkage of two cysteine residues to give a 3. Palacin, M., et al., The molecular bases of disulfide covalent bond. Cystines form in many cystinuria and lysinuric protein intolerance. Curr. proteins after incorporation of free cysteines into the Opin. Genet. Dev., 11(3), 328-335 (2001). primary structure to stabilize their folded conformation. 4. Gahl, W. A., et al., Cystinosis. N. Engl. J. Med., Cystine is the form in which cysteine exists in blood 347(2), 111-121 (2002). and urine.2 5. McBean, G. J., and Flynn, J., Molecular mechanisms of cystine transport. Biochem. Soc. The two cystine-related clinical conditions are Trans., 29(Pt 6), 717-722 (2001). cystinuria, which involves the defective membrane 6. -
The Renal Fanconi Syndrome in Cystinosis: Pathogenic Insights and Therapeutic Perspectives
REVIEWS The renal Fanconi syndrome in cystinosis: pathogenic insights and therapeutic perspectives Stephanie Cherqui1 and Pierre J. Courtoy2 Abstract | Cystinosis is an autosomal recessive metabolic disease that belongs to the family of lysosomal storage disorders. It is caused by a defect in the lysosomal cystine transporter, cystinosin, which results in an accumulation of cystine in all organs. Despite the ubiquitous expression of cystinosin, a renal Fanconi syndrome is often the first manifestation of cystinosis, usually presenting within the first year of life and characterized by the early and severe dysfunction of proximal tubule cells, highlighting the unique vulnerability of this cell type. The current therapy for cystinosis, cysteamine, facilitates lysosomal cystine clearance and greatly delays progression to kidney failure but is unable to correct the Fanconi syndrome. This Review summarizes decades of studies that have fostered a better understanding of the pathogenesis of the renal Fanconi syndrome associated with cystinosis. These studies have unraveled some of the early molecular changes that occur before the onset of tubular atrophy and identified a role for cystinosin beyond cystine transport, in endolysosomal trafficking and proteolysis, lysosomal clearance, autophagy and the regulation of energy balance. These studies have also led to the identification of new potential therapeutic targets and here, we outline the potential role of stem cell therapy for cystinosis and provide insights into the mechanism of haematopoietic stem cell-mediated kidney protection. Introduction median of ~20 years of age if cysteamine treatment is ini- Renal Fanconi syndrome presents as a generalized dys- tiated before 5 years of age6. Deposition of cystine crys- function of the proximal tubule, characterized by the tals in the cornea occurs early in the course of disease, presence of polyuria, phosphaturia, glycosuria, protein- causing photophobia and painful corneal erosions7. -
Natalis Information Sheet V03
Sema4 Natalis Clinical significance of panel Sema4 has designed and validated Natalis, a supplemental newborn screening panel offered for newborns, infants, and young children. This test may be offered to parents as an addition to the state mandated newborn screening that their child received at birth. This panel includes next-generation sequencing, targeting genotyping, and multiplex ligation-dependent probe amplification in a total of 166 genes to screen for 193 conditions that have onset in infancy or early childhood and for which there is treatment or medical management that, when administered early in an infant or child’s life, will significantly improve the clinical outcome. Conditions included in this panel were curated based on criteria such as: inclusion on current state mandated newborn screening panels, onset of symptoms occurring <10 years of age, evidence of high penetrance (>80%), and availability of a treatment or improvement in life due to early intervention. Sema4 has also designed and validated a pediatric pharmacogenetic (PGx) genotyping panel as an adjunct test to the Natalis assay. This panel includes 10 genes and 41 sequence variants involved in drug response variability. The genes and variants in the PGx genotyping panel inform on more than 40 medications that can be prescribed during childhood. Currently, there is evidence supporting the clinical utility of testing for certain PGx variants for which there are genotype-directed clinical practice recommendations for selected gene/drug pairs. Approximately 95% of all individuals will carry at least one clinically actionable variant in the PGx panel. Testing methods, sensitivity, and limitations A cheek swab, saliva sample, or blood sample is provided by the child and a biological parent. -
Newborn Screening FACT Sheet
Newborn Screening FACT Sheet Argininemia (ARG) What is Argininemia? What Symptoms or Problems Occur with ARG? Argininemia (ARG) is a condition that causes harmful [Symptoms are something out of the ordinary that a amounts of arginine and ammonia to build up in the parent notices.] body. It is considered an amino acid condition because people affected with ARG are unable to break down an Signs of ARG can begin any time from infancy to childhood. amino acid, a small molecule that makes up proteins, Usually, signs begin to show at around one to three years known as arginine. You may also hear ARG called a urea of age and include: cycle condition. This name is used to describe conditions • delayed growth • vomiting that cause ammonia to accumulate in the body. If • developmental • weak muscle tone untreated, argininemia can cause muscle problems and delays (called hypotonia) developmental delay. However, if the condition is • balancing trouble • trouble regulating detected early and proper treatment is initiated, • tight, rigid muscles body temperature individuals with argininemia can often lead healthy lives. (called spasticity) (your baby might • irritability get cold easily) What Causes ARG? • • small head size When we eat food, enzymes help break it down. Some poor appetite • • hyperactivity enzymes help break down proteins into their building sleeping longer or blocks, called amino acids. Other enzymes break down more often these amino acids. In ARG, the enzyme arginase is not working correctly. Many of these signs may occur when your baby eats foods that his or her body cannot break down. They can Arginase’s job is to help break down the amino acid be triggered by long periods of time without eating, arginine and remove ammonia from the body through illness, and infections.