1
|
Patel KP, O’Brien TW, Subramony SH, Shuster J, Stacpoole PW. The spectrum of pyruvate dehydrogenase complex deficiency: clinical, biochemical and genetic features in 371 patients. Mol Genet Metab 2012; 106:385-94. [PMID: 22896851 PMCID: PMC4003492 DOI: 10.1016/j.ymgme.2012.03.017] [Citation(s) in RCA: 125] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
CONTEXT Pyruvate dehydrogenase complex (PDC) deficiency is a genetic mitochondrial disorder commonly associated with lactic acidosis, progressive neurological and neuromuscular degeneration and, usually, death during childhood. There has been no recent comprehensive analysis of the natural history and clinical course of this disease. OBJECTIVE We reviewed 371 cases of PDC deficiency, published between 1970 and 2010, that involved defects in subunits E1α and E1β and components E1, E2, E3 and the E3 binding protein of the complex. DATA SOURCES AND EXTRACTION English language peer-reviewed publications were identified, primarily by using PubMed and Google Scholar search engines. RESULTS Neurodevelopmental delay and hypotonia were the commonest clinical signs of PDC deficiency. Structural brain abnormalities frequently included ventriculomegaly, dysgenesis of the corpus callosum and neuroimaging findings typical of Leigh syndrome. Neither gender nor any clinical or neuroimaging feature differentiated the various biochemical etiologies of the disease. Patients who died were younger, presented clinically earlier and had higher blood lactate levels and lower residual enzyme activities than subjects who were still alive at the time of reporting. Survival bore no relationship to the underlying biochemical or genetic abnormality or to gender. CONCLUSIONS Although the clinical spectrum of PDC deficiency is broad, the dominant clinical phenotype includes presentation during the first year of life; neurological and neuromuscular degeneration; structural lesions revealed by neuroimaging; lactic acidosis and a blood lactate:pyruvate ratio ≤ 20.
Collapse
Affiliation(s)
- Kavi P. Patel
- Department of Medicine (Division of Endocrinology, Metabolism and
Diabetes), College of Medicine, University of Florida, Gainesville, FL 32611,
USA
| | - Thomas W. O’Brien
- Department of Biochemistry and Molecular Biology, College of
Medicine, University of Florida, Gainesville, FL 32611, USA
| | | | - Jonathan Shuster
- Department of Epidemiology and Health Policy Research, College of
Medicine, University of Florida, Gainesville, FL 32611, USA
| | - Peter W. Stacpoole
- Department of Medicine (Division of Endocrinology, Metabolism and
Diabetes), College of Medicine, University of Florida, Gainesville, FL 32611,
USA
- Department of Biochemistry and Molecular Biology, College of
Medicine, University of Florida, Gainesville, FL 32611, USA
- Corresponding author at: UF College of Medicine, 1600 SW
Archer Road M2-238, P.O. Box 100226, Gainesville, FL 32610, USA. Fax: +1
352 273 9013. (P.W. Stacpoole)
| |
Collapse
|
2
|
Patel KP, O'Brien TW, Subramony SH, Shuster J, Stacpoole PW. The spectrum of pyruvate dehydrogenase complex deficiency: clinical, biochemical and genetic features in 371 patients. Mol Genet Metab 2012; 105:34-43. [PMID: 22079328 PMCID: PMC3754811 DOI: 10.1016/j.ymgme.2011.09.032] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Revised: 09/27/2011] [Accepted: 09/27/2011] [Indexed: 01/01/2023]
Abstract
CONTEXT Pyruvate dehydrogenase complex (PDC) deficiency is a genetic mitochondrial disorder commonly associated with lactic acidosis, progressive neurological and neuromuscular degeneration and, usually, death during childhood. There has been no recent comprehensive analysis of the natural history and clinical course of this disease. OBJECTIVE We reviewed 371 cases of PDC deficiency, published between 1970 and 2010, that involved defects in subunits E1α and E1β and components E1, E2, E3 and the E3 binding protein of the complex. DATA SOURCES AND EXTRACTION English language peer-reviewed publications were identified, primarily by using PubMed and Google Scholar search engines. RESULTS Neurodevelopmental delay and hypotonia were the commonest clinical signs of PDC deficiency. Structural brain abnormalities frequently included ventriculomegaly, dysgenesis of the corpus callosum and neuroimaging findings typical of Leigh syndrome. Neither gender nor any clinical or neuroimaging feature differentiated the various biochemical etiologies of the disease. Patients who died were younger, presented clinically earlier and had higher blood lactate levels and lower residual enzyme activities than subjects who were still alive at the time of reporting. Survival bore no relationship to the underlying biochemical or genetic abnormality or to gender. CONCLUSIONS Although the clinical spectrum of PDC deficiency is broad, the dominant clinical phenotype includes presentation during the first year of life; neurological and neuromuscular degeneration; structural lesions revealed by neuroimaging; lactic acidosis and a blood lactate:pyruvate ratio ≤20.
Collapse
Affiliation(s)
- Kavi P. Patel
- Department of Medicine (Division of Endocrinology and Metabolism), College of Medicine, University of Florida, Gainesville, FL, 32611, USA
| | - Thomas W. O'Brien
- Department of Biochemistry and Molecular Biology College of Medicine, University of Florida, Gainesville, FL, 32611, USA
| | | | - Jonathan Shuster
- Epidemiology and Health Policy Research College of Medicine, University of Florida, Gainesville, FL, 32611, USA
| | - Peter W. Stacpoole
- Department of Medicine (Division of Endocrinology and Metabolism), College of Medicine, University of Florida, Gainesville, FL, 32611, USA
- Department of Biochemistry and Molecular Biology College of Medicine, University of Florida, Gainesville, FL, 32611, USA
| |
Collapse
|
3
|
Patel MS, Hong YS, Kerr DS. Genetic defects in E3 component of alpha-keto acid dehydrogenase complexes. Methods Enzymol 2001; 324:453-64. [PMID: 10989452 DOI: 10.1016/s0076-6879(00)24253-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- M S Patel
- Department of Biochemistry, School of Medicine and Biomedical Sciences, State University of New York, Buffalo 14214, USA
| | | | | |
Collapse
|
4
|
Hong YS, Kerr DS, Liu TC, Lusk M, Powell BR, Patel MS. Deficiency of dihydrolipoamide dehydrogenase due to two mutant alleles (E340K and G101del). Analysis of a family and prenatal testing. BIOCHIMICA ET BIOPHYSICA ACTA 1997; 1362:160-8. [PMID: 9540846 DOI: 10.1016/s0925-4439(97)00073-2] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A male child with metabolic acidosis was diagnosed as having dihydrolipoamide dehydrogenase (E3) deficiency. E3 activity of the proband's cultured fibroblasts and blood lymphocytes was 3-9% of normal, while in the parent's lymphocytes it was about 60% of normal. The proband's pyruvate dehydrogenase complex (PDC) and the alpha-ketoglutarate dehydrogenase complex activities from cultured skin fibroblasts were 12% and 6% of normal, respectively. PDC activity in the parents cultured fibroblasts was 25-31% of normal. Western and Northern blot analyses showed similar quantities of E3 protein and mRNA in cultured fibroblasts from the proband and his parents. DNA sequencing of cloned full-length E3 cDNAs, from the proband and the parents, showed two mutations on different alleles of proband were inherited from the parents. One mutation is a three nucleotide (AGG) deletion, from the mother, resulting in deletion of Gly101 in the FAD binding domain. The other mutation is a nucleotide substitution (G to A), from the father, leading to substitution of Lys for Glu340 in the central domain. The same deletion mutation was found in E3 cDNA from a chorionic villus sample and cultured fibroblasts obtained from the mother's subsequent offspring. This finding illustrates the possibility of successful prenatal diagnosis of E3 deficiency utilizing mutations characterized prior to initiation of pregnancy.
Collapse
Affiliation(s)
- Y S Hong
- Department of Biochemistry, School of Medicine and Biomedical Sciences, State University of New York at Buffalo 14214, USA
| | | | | | | | | | | |
Collapse
|
5
|
Liu TC, Kim H, Arizmendi C, Kitano A, Patel MS. Identification of two missense mutations in a dihydrolipoamide dehydrogenase-deficient patient. Proc Natl Acad Sci U S A 1993; 90:5186-90. [PMID: 8506365 PMCID: PMC46680 DOI: 10.1073/pnas.90.11.5186] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023] Open
Abstract
The molecular basis of dihydrolipoamide dehydrogenase (E3; dihydrolipoamide:NAD+ oxidoreductase, EC 1.8.1.4) deficiency in an E3-deficient patient was studied. Fibroblasts cultured from the patient contained only approximately 6% of the E3 activity of cells from a normal subject. Western and Northern blot analyses indicated that, compared to control cells, the patient's cells had a reduced amount of protein but normal amounts of E3 mRNA. Direct sequencing of E3 cDNA derived from the patient's RNA as well as each of the subclones of the cDNA revealed that the patient had two substitution mutations in the E3 coding region. One mutation changed a single nucleotide from A to G, resulting in substitution of Glu (GAA) for Lys-37 (AAA). The other point mutation was a nucleotide change from C to T, resulting in the substitution of Leu (CTG) for Pro-453 (CCG). These mutations appear to be significant in that they alter the active site and possibly the binding of FAD.
Collapse
Affiliation(s)
- T C Liu
- Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, OH 44106
| | | | | | | | | |
Collapse
|
6
|
Abstract
The nature of PDC deficiency has been characterized at the levels of total and component catalytic activities as well as at the levels of component proteins and specific mRNAs. Defects in 14 cases were shown to involve the E1 component, and there was one case each of an apparent E2 and E3 deficiency. Defects involving the E1 component exhibit heterogeneous expression of E1 proteins and mRNAs, indicating that different types of mutations cause E1 deficiency. E1 deficiencies can occur either in the presence or absence of E1 proteins, representing catalytic mutations or mutations affecting the expression of E1 proteins, respectively. In every case where the content of E1 proteins is reduced, both the E1 alpha and the E1 beta peptides are simultaneously affected. This is likely to be due to rapid degradation of any E1 peptide that is not complexed into the alpha 2 beta 2 conformation. Among subjects with reduced levels of both E1 peptides, some had normal amounts of specific E1 alpha and E1 beta mRNAs. In these subjects, the primary mutations affect either translational or post-translational processes leading to the formation of mature E1 proteins in the mitochondria. In contrast, two cases of simultaneous reduction of both E1 alpha and E1 beta proteins had decreases in the amounts of E1 alpha mRNA only. Mutations in these cases may impair the transcription, nuclear processing, or stability of E1 alpha mRNA. E1 deficiency may manifest in a variable manner. Further characterization of this phenomenon might provide insight into the discrepancy between the clinical severity of the defect and the residual level of PDC catalytic activity. Available information indicates that the E1 alpha gene is located on the X chromosome, but sex distribution of E1 alpha defects suggests that the mode of inheritance may not follow a simple X-linked pattern. The availability of specific PDC antibodies and cDNA clones, as well as the application of molecular biological techniques, should facilitate the characterization of the molecular basis of various PDC deficiencies. This information should provide better understanding of the function of PDC, pathophysiology of PDC deficiency, and mechanisms of inheritance and expression of these genes.
Collapse
Affiliation(s)
- L Ho
- Department of Biochemistry, Case Western Reserve University School of Medicine, Cleveland, Ohio 44106
| | | | | | | |
Collapse
|
7
|
Robinson BH, Chun K, Mackay N, Otulakowski G, Petrova-Benedict R, Willard H. Isolated and combined deficiencies of the alpha-keto acid dehydrogenase complexes. Ann N Y Acad Sci 1989; 573:337-46. [PMID: 2634350 DOI: 10.1111/j.1749-6632.1989.tb15009.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- B H Robinson
- Department of Genetics, University of Toronto, Canada
| | | | | | | | | | | |
Collapse
|
8
|
Otulakowski G, Robinson BH, Willard HF. Gene for lipoamide dehydrogenase maps to human chromosome 7. SOMATIC CELL AND MOLECULAR GENETICS 1988; 14:411-4. [PMID: 3399966 DOI: 10.1007/bf01534650] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The gene for lipoamide dehydrogenase (LD) has been assigned to human chromosome 7 based on filter hybridization analysis of genomic DNA from rodent-human somatic cell hybrids using a cDNA probe for human LD. No indication of multiple copies of the gene was found, in accordance with previous evidence that LD in the pyruvate, alpha-ketoglutarate, and branched chain alpha-ketoacid dehydrogenase complexes is genetically as well as biochemically identical.
Collapse
Affiliation(s)
- G Otulakowski
- Research Institute, Hospital for Sick Children, Toronto, Ontario, Canada
| | | | | |
Collapse
|
9
|
van Laack HL, Ruitenbeek W, Trijbels JM, Sengers RC, Gabreëls FJ, Janssen AJ, Kerkhof CM. Estimation of pyruvate dehydrogenase (E1) activity in human skeletal muscle; three cases with E1 deficiency. Clin Chim Acta 1988; 171:109-18. [PMID: 3127087 DOI: 10.1016/0009-8981(88)90296-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Pyruvate dehydrogenase (E1) catalyzes the rate-limiting step of the pyruvate dehydrogenase complex. Since E1 activity of human muscle tissue is low, a sensitive method is needed for diagnostic purposes. Measurement of 14CO2 production from [1-14C]pyruvate provides a specific and sensitive assay for measuring E1 activity. We use as artificial electron acceptor dichlorophenolindophenol (DCPIP) instead of the often applied ferricyanide. The method can be applied to small muscle samples obtained by needle or open biopsy. We prefer to use total homogenate because E1 activities in homogenate are higher than in the corresponding 600-g supernatant of skeletal muscle tissue. Control values in homogenate are higher or of the same order as those reported by others.
Collapse
Affiliation(s)
- H L van Laack
- Department of Pediatrics, University Hospital, University of Nijmegen, The Netherlands
| | | | | | | | | | | | | |
Collapse
|
10
|
Birch-Machin MA, Shepherd IM, Solomon M, Yeaman SJ, Gardner-Medwin D, Sherratt HS, Lindsay JG, Aynsley-Green A, Turnbull DM. Fatal lactic acidosis due to deficiency of E1 component of the pyruvate dehydrogenase complex. J Inherit Metab Dis 1988; 11:207-17. [PMID: 3139934 DOI: 10.1007/bf01799876] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Pyruvate dehydrogenase complex deficiency is thought to be a common cause of lactic acidosis. We report a patient with lactic acidosis and intermittent weakness. The rate of oxidation of pyruvate by intact skeletal muscle and liver mitochondrial fractions was impaired and pyruvate dehydrogenase complex (PDC) activity was low. The amounts of immunoreactive dihydrolipoyl transacetylase and dihydrolipoyl dehydrogenase in liver and skeletal muscle mitochondrial fractions from the patient were normal. However, there were markedly lower concentrations of both the alpha and beta subunits of the E1 component of PDC.
Collapse
|
11
|
Ho L, Hu CW, Packman S, Patel MS. Deficiency of the pyruvate dehydrogenase component in pyruvate dehydrogenase complex-deficient human fibroblasts. Immunological identification. J Clin Invest 1986; 78:844-7. [PMID: 3091638 PMCID: PMC423686 DOI: 10.1172/jci112651] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
A previously reported deficiency of "total" pyruvate dehydrogenase complex activity is further characterized. Dihydrolipoyl transacetylase (E2) and lipoamide dehydrogenase (E3) activities in the patient's fibroblasts were normal. Pyruvate dehydrogenase activity (E1) was 33% of that in fibroblasts from an age-matched control. The amounts of each of the components of pyruvate dehydrogenase complex were analyzed using an immunoblot technique and specific antibodies. Levels of components E2 and E3 were the same in fibroblasts from the patient and control, confirming the activity measurements. However, the levels of E1 alpha and E1 beta were reduced markedly in fibroblasts from the patient. Thus, impairment in the pyruvate dehydrogenase complex activity was due to a reduction in the amount of the E1 component of the complex.
Collapse
|
12
|
Yoshino M, Koga Y, Yamashita F. A decrease in glycine cleavage activity in the liver of a patient with dihydrolipoyl dehydrogenase deficiency. J Inherit Metab Dis 1986; 9:399-400. [PMID: 3104678 DOI: 10.1007/bf01800493] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
|
13
|
Abstract
Pyruvate dehydrogenase deficiency may be a non-specific consequence of many different neurological degenerative disorders. There are also serious methodological problems in estimating the activity of this enzyme complex.
Collapse
|
14
|
Otulakowski G, Nyhan W, Sweetman L, Robinson BH. Immunoextraction of lipoamide dehydrogenase from cultured skin fibroblasts in patients with combined alpha-ketoacid dehydrogenase deficiency. Clin Chim Acta 1985; 152:27-36. [PMID: 2414042 DOI: 10.1016/0009-8981(85)90172-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Combined deficiency of the pyruvate, alpha-ketoglutarate and branched-chain keto acid dehydrogenase complexes is a rare condition in which activity of lipoamide dehydrogenase is either reduced or grossly deficient. Activities in three cell strains from patients with excretion of branched chain ketoacids and alpha-ketoglutarate and lactic-acidemia showed decreased levels of the three alpha-ketoacid dehydrogenases. Lipoamide dehydrogenase activity was 5% of normal in one cell stain and 50-60% in the other two. Antiserum raised against lipoamide dehydrogenase was used to immunoprecipitate labelled lipoamide dehydrogenase from fibroblasts grown on [35S]methionine. After separation of cell proteins from control fibroblasts by sodium dodecyl sulphate/polyacrylamide gel electrophoresis and fluorography, a prominent 55 kilodalton band was evident in cell extracts treated with the antiserum which corresponded to lipoamide dehydrogenase. In the cell lines from patients with combined alpha-ketoacid dehydrogenase deficiency immunoprecipitation of lipoamide dehydrogenase showed that this protein was present in similar amounts to that seen in control cell lines and was also of the correct molecular weight.
Collapse
|