Jeffrey A Brinker, M.D.
- Professor of Medicine
- Joint Appointment in Radiology and Radiological Science
The description of each case uses standard medical terminology; student readers therefore may need to purchase 30 gm elimite amex skin care network consult a medical dictionary for explanations quality 30gm elimite skin care owned by procter and gamble. Each vignette is also followed by a few questions that are intended to buy elimite with a mastercard acne jawline initiate discussion of some basic genetic or clinical principles illustrated by the case. The cases are not intended to be definitive or comprehensive or to set a standard of care; rather, they are simply illustrations of the application of genetic and genomic principles to the practice of medicine. Although the cases are loosely based on clinical experience, all individuals and medical details presented are fictitious. Abacavir-Induced Stevens-Johnson Syndrome/Toxic Epidermal Necrolysis (Genetically Determined Immunological Adverse Drug Reaction) Autosomal Dominant Principles. Pharmacogenetic test that has been widely adopted as standard of care. Significant positive and negative predictive values. Ethnic differences in the frequency of the predisposing allele Major Phenotypic Features. Widespread red/purple patches on the skin and mucosal membranes (eye, mouth, genitalia) 10 to 14 days after beginning antiretroviral treatment with abacavir. His encephalitis and pneumonia cleared, and he was discharged from the hospital on oral antiparasitic treatment. He had a disseminated cutaneous eruption of discrete dark red macules on 90% of the body surface area, a detachment of 5% of the epidermis, genital ulcerations, erosive stomatitis, and conjunctival lesions with hyperemia but without keratitis or corneal erosions. The application of minor pressure to the skin resulting in sloughing of the skin (Nikolsky sign). Because of previous reports of cutaneous hypersensitivity reactions with abacavir treatment, the drug was stopped, and he was transferred to a burn unit, monitored for further skin sloughing, and treated with supportive care. The epidermis began to heal over the next week, and the skin lesions resolved completely within 3 weeks. Background Adverse drug reactions are defined as harmful reactions caused by normal use of a drug at correct doses. The majority (75% to 80%) of all adverse drug reactions are caused by predictable, nonimmunological effects, some of which are due to genetically determined pharmacokinetic or pharmacodynamic differences between individuals. The remaining 20% to 25% of adverse drug events are caused by largely unpredictable effects that may or may not be immune-mediated. Immune-mediated reactions account for 5% to 10% of all drug reactions and represent true drug hypersensitivity, with immunoglobulin E– mediated drug allergies with hives or laryngeal swelling, falling into this category. A different kind of skin reaction, a generalized maculopapular rash, is also common with certain medications, including sulfa drug antibiotics. This extent of epidermal detachment is in the “zone of overlap” between Stevens-Johnson syndrome and toxic epidermal necrolysis. B, Stevens-Johnson syndrome, showing involvement of lips and mucous membranes of the mouth. Management Discontinuation of the offending drug and transfer to a burn unit for supportive care are the mainstays of treatment. Other therapies such as systemic corticosteroids and intravenous immunoglobulin have been suggested but have not to date been proven to be either beneficial or harmful. Neither parent has a family history of skeletal dysplasia, birth defects, or genetic disorders. The obstetrician explained to the parents that their fetus had the features of achondroplasia. She had the physical and radiographic features of achondroplasia, including frontal bossing, megalencephaly, midface hypoplasia, lumbar kyphosis, limited elbow extension, rhizomelia, trident hands, brachydactyly, and hypotonia. Achondroplasia has an incidence of 1 in 15,000 to 1 in 40,000 live births and affects all ethnic groups. Mutation of this nucleotide accounts for nearly 100% of achondroplasia; more than 80% of patients have a de novo mutation. Phenotype and Natural History Patients with achondroplasia present at birth with rhizomelic shortening of the arms and legs, relatively long and narrow trunk, trident configuration of the hands, and macrocephaly with midface hypoplasia and prominent forehead. They have a birth length that is usually slightly less than normal, although occasionally within the low normal range; their length or height falls progressively farther from the normal range as they grow. In general, patients have normal intelligence, although most have delayed motor development. Their delayed motor development arises from a combination of hypotonia, hyperextensible joints (although the elbows have limited extension and rotation), mechanical difficulty balancing their large heads, and, less commonly, foramen magnum stenosis with brainstem compression. Abnormal growth of the skull and facial bones results in midface hypoplasia, a small cranial base, and small cranial foramina. The midface hypoplasia causes dental crowding, obstructive apnea, and otitis media. Narrowing of the jugular foramina is believed to increase intracranial venous pressure and thereby to cause hydrocephalus. Narrowing of the foramen magnum causes compression of the brainstem at the craniocervical junction in approximately 10% of patients and results in an increased frequency of hypotonia, quadriparesis, failure to thrive, central apnea, and sudden death. Between 3% and 7% of patients die unexpectedly during their first year of life because of brainstem compression (central apnea) or obstructive apnea. Other medical complications include obesity, hypertension, lumbar spinal stenosis that worsens with age, and genu varum. Management Suspected on the basis of clinical features, the diagnosis of achondroplasia is usually confirmed by radiographic findings. Throughout life, management should focus on the anticipation and treatment of the complications of achondroplasia. During infancy and early childhood, patients must be monitored for chronic otitis media, hydrocephalus, brainstem compression, and obstructive apnea and treated as necessary. Treatment of patients with brainstem compression by decompression of the craniocervical junction usually results in marked improvement of neurological function. During later childhood and through early adulthood, patients must be monitored for symptomatic spinal stenosis, symptomatic genu varum, obesity, hypertension, dental complications, and chronic otitis media and treated as necessary. Treatment of the spinal stenosis usually requires surgical decompression and stabilization of the spine. Obesity is difficult to prevent and control and often complicates the management of obstructive apnea and joint and spine problems. Patients should avoid activities in which there is risk for injury to the craniocervical junction, such as collision sports, use of a trampoline, diving from diving boards, vaulting in gymnastics, and hanging upside down from the knees or feet on playground equipment.
Engineering direct fructose production in processed potato tubers by expressing a bifunctional alpha-amylase/glucose isomerase gene complex buy 30gm elimite otc skin care logos. Enzyme-enzyme interactions as modulators of the metabolic fux through the citric acid cycle buy elimite 30gm skin care and pregnancy. Creating a bifunctional protein by insertion of beta-lactamase into the maltodextrin-binding protein generic elimite 30gm with amex acne 415. Directed evolution of ligand dependence: small-molecule-activated protein splicing. Failure of channelling to maintain low concentrations of metabolic interme diates. Channelling can afect concentrations of metabolic inter mediates at constant net fux: artefact or reality? Phenylalanine ammonia-lyase and cinnamic acid hydrolase as assembled consecutive enzymes on microsomal membranes of cucumber cotyledons: Co-operation and sub cellular distribution. Crowding and hydration efects on protein conformation: a study with sol-gel encapsulated proteins. Genetic selection for protein solubility enabled by the fold ing quality control feature of the twin-arginine translocation pathway. Co-translational domain folding as the structural basis for the rapid de novo folding of frefy luciferase. A single-chain antibody/epitope system for functional analysis of protein-protein interactions. Low viscosity in the aqueous domain of cell cytoplasm measured by picosecond polarization microfuorimetry. Structural and functional properties of a multi-enzyme complex from spinach chloroplasts. Directed evolution of protein switches and their application to the creation of ligand-binding proteins. Allosteric efects acting over a distance of 20–25 A in the Escherichia coli tryptophan synthase bienzyme complex increase ligand afnity and cause redistribution of covalent intermediates. Tree-dimensional structure of the tryptophan synthase alpha 2 beta 2 multienzyme complex from Salmonella typhimurium. Structural basis for channelling mechanism of a fatty acid beta-oxidation multienzyme complex. Metabolon formation and metabolic channeling in the biosynthesis of plant natu ral products. Efect of channelling on the concentration of bulk-phase intermediates as cytosolic proteins become more concentrated. Metabolic engineering of dhurrin in transgenic Arabidopsis plants with marginal inadvertent efects on the metabolome and transcriptome. Subcellular localization of Arabidopsis 3-hydroxy-3 methylglutaryl-coenzyme A reductase. Preparation and kinetic characterization of a fusion protein of yeast mitochondrial citrate synthase and malate dehydrogenase. A novel fuorescence ratiometric method confrms the low solvent viscosity of the cytoplasm. The infuence of macromolecular crowding and macromolecular confnement on bio chemical reactions in physiological media. N-Hydroxytyrosine as an intermediate in the biosynthesis of dhurrin by Sorghum bicolor (Linn) Moench. Channeling of intermediates in dhurrin biosynthesis by a microsomal system from Sorghum bicolor (linn) Moench. Sequence and structural duality: designing peptides to adopt two stable conformations. No convincing evidence is available for metabolic channeling between enzymes form ing dynamic complexes. Structural and kinetic analysis of a channel-impaired mutant of tryptophan synthase. Electrostatic channeling of oxaloacetate in a fusion protein of porcine citrate synthase and porcine mitochondrial malate dehydrogenase. Calvin cycle multienzyme complexes are bound to chloroplast thylakoid membranes of higher plants in situ. Endoplasmic reticulum as a site of phenylpropanoid and favonoid metabolism in Hippeastrum. Enzyme organization in the polyaromatic-biosynthetic pathway: the arom conjugate and other multienzyme systems. Estimation of macromolecule concentrations and excluded vol ume efects for the cytoplasm of Escherichia coli. By channeling metabolic pathways in organisms toward a desired metabolite through rational introduction, modifcation, and removal of genes, a wide range of valuable products can be produced. Unfortunately, many desired compounds are produced only in small amounts in their native or engineered hosts. In the past, the improvement of metabolic pathways has been done primarily by evolutionary breeding methods or repeated rounds of mutagenesis and selection of a desired phenotype [61,66]. Productivity of the desired metabolite can be increased by carefully balancing the expression of the genes and metabolic fux, both within the metabolic pathway and between the pathway and the host’s native metabolism. Pathway engineering also involves improvement of the overall cellular physiology, extension of the host’s sub strate range, and deletion or reduction of by-product formation . In this chapter, we review the most important considerations for successful metabolic pathway engineering and illustrate the concepts with selected examples. The frst whole genome sequence of the bacterium Haemophilus infu enzae was reported in July 1995 .
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However cheap elimite 30gm otc skincare for men, the overall elevation of allele frequencies in Europe (relative to buy elimite 30 gm with mastercard acne toner non-European populations) is more suggestive of positive selection in response to order elimite online acne 3 step system some infectious agent. Thus geneticists continue to debate whether genetic drift or heterozygote advantage (or both) adequately accounts for the unusually high frequencies that some deleterious alleles achieve in some populations. Many of the alleles found in one population are found in all human populations, at similar frequencies around the globe. Different alleles arose from random mutation in humans who lived in these small isolated settlements; most of these would be expected to confer no selective advantage or disadvantage and are therefore selectively neutral. For the population geneticist and anthropologist, selectively neutral genetic markers provide a means of tracing human history. The interactions of genetic drift, selection due to environmental factors, and gene flow brought about by migration and intermarriage have different effects at loci around the genome: they may equalize allele frequencies throughout many subpopulations, may cause major differences in frequency between populations, or may cause certain alleles to be restricted to just one population. They are therefore useful as markers for charting human migration patterns, for documenting historical admixture between or among populations, and for determining the degree of genetic diversity among identifiable population subgroups. Figure 9-2 illustrates this type of analysis to establish that Hispanics as a group are genetically very heterogeneous, with ancestors from many parts of the world. Each vertical line represents one individual ((totaling hundreds, as shown by the numbers), and subjects are displayed according to the predominant ancestry contribution to their genomes. Most African Americans have genomes of predominantly African origin (blue), and most European Americans have genomes of predominantly European origin (red), although there is a range of ancestry contribution among different subjects. In contrast, Hispanic Americans are a more heterogeneous group, and most individuals have genomes with significant contributions from four or five different origins. For example, Figure 9-3 shows the results from several hundred individuals from Puerto Rico, whose individual genomes can be shown to consist of various proportions of African and European heritage, with much less Native American genetic heritage. Although there is disagreement about the scientific, medical, or anthropological value of the information for most individuals, the availability of ancestry testing has attracted widespread attention from those with interests in their family histories or diasporic heritage. The analysis demonstrates that the Puerto Rican genomes are heterogeneous; some individuals have genomes of predominantly European origin, and others have a much greater contribution from West Africa, whereas there is much less contribution from the Americas. Population Genetics and Race Population genetics uses quantitative methods to explain why and how differences in the frequency of genetic disease and the alleles responsible for them arose among different individuals and ethnic groups. What population genetics does not do, however, is provide a biological foundation for the concept of “race. Physicians must pay attention to the social milieu their patients navigate, and the impact of racial categorization on the health and well-being of their patients must be taken into account if physicians are to understand and respond to patient needs (see Box). A n ce str y a n d H e a lth the significance of genetic ancestry for the practice of medicine reflects the role that allelic variants with different frequencies in different populations have on various clinically relevant functions. Although this area of study is still in its early stages, it is already clear that including assessment of genetic ancestry can provide useful information to improve prognostic predictions compared to those that depend only on self-declared racial or ethnic identity. As an illustration of this point, a study of lung function to classify disease severity in a group of African American asthmatics showed that predictions of the overall degree of lung impairment in these patients were more accurate when genetic ancestry was considered, rather than relying solely on self-reported race. Racial categories are constructed using poorly defined criteria that subdivide humankind using physical appearance. Although some of these distinguishing characteristics have a basis in the differences in the alleles carried by individuals of different ancestry, others likely have little or no basis in genetics. However, with the expansion of individualized genetic medicine, it is hoped that more and more of the variants that contribute to disease will be assessed directly rather than having ethnicity or “race” used as a surrogate for an accurate genotype. Analysis of the genetic basis of disease in the context of worldwide human relationships and migration. What proportion of individuals would be expected to be heterozygous at this locus? If no prophylaxis were given, what fraction of second pregnancies would be at risk for hemolytic disease of the newborn due to Rh incompatibility? In a population at equilibrium, three genotypes are present in the following proportions: A/A, 0. In a screening program to detect carriers of β-thalassemia in an Italian population, the carrier frequency was found to be approximately 4%. The frequency of the β-thalassemia allele (assuming that there is only one common β-thalassemia mutation in this population) b. The proportion of matings in this population that could produce an affected child c. The incidence of β-thalassemia among the offspring of couples both found to be heterozygous 5. What explanations could you offer to explain the frequencies in those populations that are not in equilibrium? Hurler syndrome is an autosomal recessive condition with a population incidence of approximately 1 in 90,000 in your community. How would your answers to these questions differ if the disease in question were cystic fibrosis instead of Hurler syndrome? In a certain population, each of three serious neuromuscular disorders—autosomal dominant facioscapulohumeral muscular dystrophy, autosomal recessive Friedreich ataxia, and X-linked Duchenne muscular dystrophy—has a population frequency of approximately 1 in 25,000. Suppose that each one could be treated, so that selection against it is substantially reduced and affected individuals can have children. As discussed in this chapter, the autosomal recessive condition tyrosinemia type I has an observed incidence of 1 in 685 individuals in one population in the province of Quebec, but an incidence of approximately 1 in 100,000 elsewhere. Suggest two possible explanations for the difference in allele frequencies between the population in Quebec and populations elsewhere. C H A P T E R 1 0 Identifying the Genetic Basis for Human Disease this chapter provides an overview of how geneticists study families and populations to identify genetic contributions to disease.
Majority of victims of this anemia do not excrete necessary glycoprotein (called internal factor) (Arsic et al discount elimite 30gm online skin care experts. The coenzyme takes part in several intramolecular rearrangements catalyzed by enzymes where hydrogen atom and another group bound to discount elimite 30 gm on-line acne description the neighboring carbon atoms inside the substrate purchase generic elimite line acne gel prescription, by exchanging places (Figure 12a). The example is methyl malonyl-CoA mutase reaction (Figure 12b), important in the fatty acids’ metabolism containing an odd number of carbon atoms, which leads to the formation of succinyl CoA, intermediate in the chain of citric acid (Banerjee and Ragsdale, 2003). Methylcobalamin takes part in the transfer of methyl groups and the regeneration of methionine from homocysteine in mammals. In this reaction, the methyl group of 5 methyltetrahydrofolate transits into reactive, reduced form of cobalamin creating methylcobalamin, which can transfer a methyl group to thiol chain of homocysteine. The third group of cobalamin enzymes is reduced dehalogenase dependent on vitamin B12. Although lipoic acid is often described as vitamin B, it seems that the animals are capable of synthesizing it. It is necessary for particular bacteria and protozoa to grow (Figure 13) (Shen et al. Lipoamide It is believed for lipoamide to function as a pendulum which carries acyl groups between active centers in multi-enzymatic complexes. Then, the acyl group is moved to the sulfur atom of coenzyme A giving reduced (dihydrolipoamide) form of prosthetic group. The last step catalyzed by pyruvate dehydrogenase complex is the oxidation of dihydrolipoamide. The actions of multiple coenzymes of pyruvate dehydrogenase complex show how coenzymes supplying reactive groups and thus increasing catalytic diversity of proteins are used for storing energy and carbon building blocks (Horton et al. Ubiquinone Ubiquinone (coenzyme Q) (Figure 14a) is a coenzyme soluble in fats synthesized by all species. In the membrane, ubiquinone transports electrons between enzymatic complexes situated in the membrane. Ubiquinone analog called plastoquinone (Figure 14b) has a similar function in the photosynthetic transport of electrons in chloroplasts (DiNicolantonio et al. It is responsible for the moving of protons from one side of the membrane to another by the process known as cycle Q. They contain functional group either as a part of their protein skeleton or as a prosthetic group (Horton et al. Metal ions, iron-sulfur clusters, and heme groups are reactive centers usually found in these protein coenzymes. Thioredoxins are observed as reduction agents (cycle of citric acid, photosynthesis, and synthesis of deoxyribonucleotides). Disulfide reactive center of thioredoxin is on the surface of the protein, so it is available to the active centers of corresponded enzymes (Horton et al. Heme of cytochrome a has a hydrophobic chain of 17 carbons on C-2 porphyrin ring and formyl group on C-8, while heme of type b has a vinyl group attached on C-2 and methyl group on C-8. In cytochromes of type c, the heme is covalently bound to apoprotein with two thioester bonds formed by the addition of thiol groups of two cysteine residues for vinyl groups of the heme (Heldt and Piechulla, 2011). The tendency to transfer an electron to another substance, measured as a reductive potential, also varies among cytochromes. The range of reduction potentials among prosthetic groups is an 180 Chemia Naissensis, Vol 1, Issue 1, 153-183 essential property of membrane-connected electron transferred cycles and biosynthesis (Heldt and Piechulla, 2011). The nicotinamide dinucleotide binding motif: a comparison of nucleotide binding proteins. Probing the phosphopantetheine arm conformations of acyl carrier proteins using vibrational spectroscopy. Lactate oxidation at the mitochondria: a lactate-malate-aspartate shuttle at work. Electron donors supporting growth and electroactivity of Geobacter sulfurreducens anode biofilms. This allows to compare key parameters intra and inter-individually as well as across different diseases and disease groups, and guarantees interoperability with other registries committed to the same standards. Disorders of phenylalanine and tetrahydrobiopterin metabolism Argininosuccinate synthetase deficiency 12. Disorders of sulfur amino acid and sulfide metabolism Arginase deficiency Additional Information saved14. The cardiac isoform is exclusively expressed in the heart during human One of the ﬁrst major steps in understanding the structure and and mouse development (Fougerousse et al. It is mainly transmitted in an autosomal-dominant fashion reviewed by (Schlossarek et al. Thecardiacisoformdiffersfromtheslow-skeletalandthefast skeletalisoformsbycardiac-speciﬁcregions(C0,M,28-aminoacid insertion inC5) that are highlightedinyellow. Reference F1 Country Mutation2 Original description Location Protein consequence3 Adalsteinsdottir et al. A total of 51 cases of homozygotes or com cells from heterozygous or homozygous Mybpc3-targeted knock-in pound heterozygotes have been reported, composed of 26 cases with mice reproduced observations made in human and mouse studies double truncating mutations (Richard et al. This was supported in heterozygous Mybpc3-targeted knock-in stolic dysfunction independentofhypertrophyastheearlyconsequence mice (Vignier et al. These data suggest haploinsufﬁciency as the main disease mechanism for heterozygous truncating mutations (for reviews, see Marston et al. Three weeks from birth onwards, poison polypeptides on the structure and/or function of the sarcomere.
For these reason nutrition can be particularly important for children purchase elimite 30gm without prescription tazorac 005 acne, as it is largely dependent on the nutrients provided by parents and other adults quality elimite 30 gm acne before and after. Aims the aim of the study is determining the mothers nutritional knowledge and practices on childrens’ nutritional habits and growth curves elimite 30 gm line skin care products online. Materials and Methods this study was carried out with 60 mothers who have children aged between 3 to 5 and applied to the Bezmialem Vakif University Health Practice and Research Center. Weights and heights of both mothers and children were measured and 24 hours food consumption and food consumption frequency was recorded. Mothers who have higher nutritional knowledge level were found to have normal weight percentiles of their children. Discussion and Conclusion the level of education and income of the individuals has a significant effect on nutritional information and nutritional preferences. This situation can be explained by mothers with higher nutritional knowledge fed their children with more vegetables, fruits, legumes, and refrain from giving junk food to their children. In conclusion, there is a need to increase nutrition education to mothers by health professionals for healthy development of children. Mean age at diagnosis is 35, Cholestatic jaundice with neonatal spontaneous remission, cataract, tendon xanthomas with early onset, early atherosclerosis, osteoporosis, neurological dysfunction and respiratory failure may be associated with the diagnosis. We aimed to present two sibling who were diagnosed with Tendon xanthomas in a family scan. Case 1: Our 26-year-old patient had no complaints until 23 years, then she was admitted to the orthopedics outpatient clinic because of the bilaterally yellowing swelling on the joints. Physical examination revealed a mass of approximately 5x3 cm on both Achilles tendons. Case 2: the second case was detected as a result of family screening of the first case. Physical examination revealed 2x1 cm mass in both knees and 5x6 cm mass in distal of bilateral Achilles tendons. Results: Aim of the presented cases is; in order to emphasize that with early diagnosis and treatment procedure, better results can be obtained before the neurological disorder time. Case report: A ten-year-old boy and his 11-year-old girl cousin admitted to our practice because of developmental delay and joint stiffness. While the parents of boy were first degree cousins, there was no consanguinity between the parents of the girl. Both of patients had short stature, joint deformities, joint stiffness and coarse facial features, but no organomegaly. In laboratory, urine total glycosaminoglycan, α-iduronic acid levels and glycosaminoglycan electrophoresis were normal. Plasma lysosomal enzyme levels were evaluated by suspicion of mucolipidosis in patients with clinical and radiological findings. Plasma β-mannosidase, β-hexosaminidase and β-hexosaminidase A levels were elevated. Therefore, early recognition of disease and close monitoring of patients for neurological symptoms are important, since the clinical progression cannot be predicted based on genotype, family history, or any other parameter. Keywords: X linked adrenoleukodystrophy, hematopoietic stem cell transplantation, childhood cerebral adrenoleukodystrophy. Variable features of this condition include failure to thrive, and developmental delay or intellectual disability. Additional symptoms are cognitive impairment, skeletal and dental abnormalities, delayed motor milestones, cardiomyopathy, dysphagia, and respiratory insufficiency. Both patients have got sideroblastic anemia, lactic acidosis, failure to thrive, developmental delay, chronic diarrhea and in addition the older sister has got strabismus and skeletal anomalies. Case: the patient presented with anaemia, thrombocytopenia and hepatosplenomegaly at 19 months of age. At 3 years and 8 months of age splenectomy was performed because of hypersplenism and severe pancytopenia. At 5 years of age ultrasound and computerized tomography demonstrated multiple conglomerated enlarged mesenteric lymph nodes measured the biggest was 5cm. Tru-cut biopsy of lymph node revealed hyaline necrosis, and diffuse infiltration of Gaucher cells (Gaucheroma). Seven years after the diagnosis of gaucheroma, the patient presented with chronic watery diarrhea with ascites, generalized edema and low albumin level (1. Abdominal ultrasound showed moderate ascites and fluid collection in interloops and enlarged mesenteric lymph nodes. Although most patients manifest typical clinical findings, the disease presentation may show great variability. Sami Ulus Training and Research Hospital 2Pediatric Intensive Care Unit, University of Health Sciences, Ankara Dr. Disease is mainly revealed by hypoglycemia and lactic acidosis, both symptoms being characteristic for an enzymatic block in the last steps of the gluconeogenesis. Patients present with ke totic hypoglycemia and lactic acidosis triggered by catabolic episodes such as prolonged fasting and/or febrile infections. Laboratory findings may include hyperalaninemia, hyperketonemia, an increased lactate/ pyruvate ratio, an elevated plasma concentration of uric acid, glyceroluria, and pseudo-hypertriglyceridemia. Complete deletion of exon 1 was carried by three patients in two different families.