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Published byLambert Hardy Modified over 8 years ago
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Bruno Sopko
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Genetics Biochemistry Clinical medicine
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GDM=cca 1/10 of rare diseases Cca 700-800 nosologic units (>1000 genes) Total incidence 1:500 Each GP has, at least, 1-2 patients with GDM Cca 30% of these diseases are curable (100 diseases well) Rare diseases Prevalence < 1:2000 Rare diseases GDM
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< 1500 Da> 1500 Da Acute toxicityyesno Chronic progression±yes Localizationcytosol, ECTmembranes Structural changesnoyes Diagnosisblood, urinetissue (urine) Originexogenousendogenous Dietary treatment, vitaminssuccessfulunsuccessful
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< 1500 Da ◦ gases, inorganic ions ◦ Aminoacids ◦ organic acids ◦ Saccharides ◦ Polyols ◦ simple lipids ◦ purins, pyrimidins ◦ Vitamins ◦ oligomers: peptids up to cca 5- 10 AA, oligosaccharides cytosol, mitochondrial stroma, blood, urine > 1500 Da ◦ Glycolipids ◦ Sphingolipids ◦ Plasmalogenes ◦ neutral polysaccharides (glycogen) ◦ Mucopolysaccharides (other oligomers: proteins, nucleic acids...) Usually associated with membranes Usually not observed in larger amounts in body fluids ( x MS/MS technology)
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< 1500 Da Dependent of exogenous intake manifested (repeated) by acute toxicity, frequently accompanied by encephalopathy/coma common hepatopathy Frequent deviations in common biochemical tests-ammonia, ABB, ketone bodies, glycemia, uric acid... Symptom occurence dependent on specific nutrition part, fasting catabolism Possibly chronic (low toxicity) Usually well cured by diet and vitamin supply > 1500 Da Usually independent on exogenous nutrition supply Frequently progressive Possible fetal dysmorphia Commonly impairment of nervous system and muscles Organomegalia as theresulting from lysosomal storage diseases Diet and vitamins do not have any long term effect
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Newborn (or neonatal) screening is a process of testing newborn babies for increased risk of certain rare diseases, which in case of early detection and early treatment can prevent serious injury to a child. At the age of 48-72 hours after birth several drops of blood from the heel of the child are sampled on a special paper and sent for analysis to the screening laboratory. In the event that there was no suspicion of the screened disease (negative result), the respective laboratory does not issue a formal statement on normal findings.
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Lysosmal storage disorders Aminoacidopathy, organic acidurias Fatty acid -oxidation disorders Peroxisomal disorders Mitochondrial diseases Glycosylation disorders Others
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1. Endocrine Disorders ◦ Congenital hypothyroidism ◦ Congenital adrenal hyperplasia 2. Disturbances of amino acid metabolism ◦ Phenylketonuria ◦ Glutaric aciduria, Type I (glutaryl-CoA dehydrogenase deficiency) ◦ Isovaleryl-CoA dehydrogenase deficiency (Isovaleric acidemia) ◦ Maple syrup urine disease 3. Disorders of fatty acid oxidation ◦ Carnitine uptake/transporter defects ◦ Carnitine-acylcarnitine translocase deficiency ◦ Carnitine palmitoyl transferase I deficiency (CPT I) ◦ Carnitine palmitoyl transferase II deficiency (CPT II) ◦ Very long chain acyl-CoA dehydrogenase deficiency (VLCADD) ◦ Long chain L-3 hydroxyacyl-CoA dehydrogenase deficiency (LCHADD) ◦ Medium chain acyl-CoA dehydrogenase deficiency (MCADD) 4. Cystic fibrosis ◦ Cystic fibrosis
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Autosomal recessive Laboratory diagnosis: 17-hydroxyprogesterone - increased Treatment – supplementing steroids Girls – surgical correction
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PKU HPA
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Autosomal recessive Laboratory diagnosis: increased phenylalanine, and ratio Phe/Tyr Treatment – alimentary – decreased intake Phe and supplemented Tyr
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Autosomal recessive Laboratory diagnosis: Three level model IRT/DNA/IRT: immunoreactive trypsinogen (IRT) following DNA analysis sweat test Treatment: Lungs: inhalation mucolytics + breathing physiotherapy in several (idealy 3) short blocks daily. Well balanced nutrition, high caloric : 130 -150 % RDA, supplementing vitamins soluble in fats, supplementation of NaCl. Infection control: antibiotics at all acute exacerbation respiratory infection, broad-spectrum antibiotics, with antistaphylococcus effect; when deteced Pseudomonas aeruginosa specific ATB therapy, even withou clinical manifestation. High limit dosages, at least 14 days.
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http://www.novorozeneckyscreening.cz http://www.novorozeneckyscreening.cz Kožich, V. : Úvod do biochemické Genetiky Jean-Marie Saudubray, Georges van den Berghe, John H. Walter:Inborn Metabolic Diseases; Diagnosis and Treatment;Fifth Edition, Springer, 2012 William L. Nyhan, Bruce A. Barshop, Pinar T. Ozand, MD: Atlas of Metabolic Diseases; Second edition, Hodder Education,2005 Joe T. R. Clarke: A Clinical Guide to Inherited Metabolic Diseases;Second Edition, Cambridge University Press, 2004
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