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Georgiou T, Drousiotou A, Campos Y, Caciotti A, Sztriha L, Gururaj A, Ozand P, Zammarchi E, Morrone A, D'Azzo A. Erratum: Four novel mutations in patients from the Middle East with the infantile form of GM1-gangliosidosis. Hum Mutat 2004. [DOI: 10.1002/humu.9296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Cruz-Martínez A, Arpa J, Santiago S, Pérez-Conde C, Gutiérrez-Molina M, Campos Y. Single fiber electromyography (SFEMG) in mitochondrial diseases (MD). ELECTROMYOGRAPHY AND CLINICAL NEUROPHYSIOLOGY 2004; 44:35-8. [PMID: 15008023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/29/2023]
Abstract
Conventional EMG, nerve conduction studies and SFEMG were performed in 18 patients with various phenotypes of MD. 14 cases showed findings consistent with mild myopathy, 2 patients signs of sensory-motor axonal neuropathy and 2 cases a mixture of myopathy and axonal neuropathy. Motor unit fiber density was mild increased in 8 out of 13 tested cases. Jitter was abnormal in 10 out of 18 tested patients. Jitter abnormalities were not related to myopathic or neurogenic features in the EMG study, and may be observed in muscles without clinical weakness. The results suggest the existence of neuromuscular transmission disturbances in patients with MD.
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Georgiou T, Drousiotou A, Campos Y, Caciotti A, Sztriha L, Gururaj A, Ozand P, Zammarchi E, Morrone A, D'Azzo A. Four novel mutations in patients from the Middle East with the infantile form of GM1-gangliosidosis. Hum Mutat 2004; 24:352. [PMID: 15365997 DOI: 10.1002/humu.9279] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
GM1-gangliosidosis is a lysosomal storage disorder caused by a deficiency of beta-galactosidase. It is mainly characterized by progressive neurodegeneration and in its most severe infantile form it leads to death before the age of four. We have performed molecular analysis of five patients with the infantile form of GM1-gangliosidosis originating from the Middle East (two from Saudi Arabia and three from the United Arab Emirates). We have identified four novel mutations and one previously reported mutation in the GLB1 gene. The first novel mutation found in the homoallelic state in a patient from Saudi Arabia, is a c.171C>G transversion in exon 2 which creates a premature stop codon. Northern blot analysis in fibroblasts from the patient showed no mRNA and expression studies in COS-1 cells showed complete absence of the 85kDa precursor protein and no catalytic activity. The second novel mutation is a splicing error in intron 2, c.245+1G>A. This mutation was found in the heteroallelic state in a patient from Saudi Arabia, the second mutation being the previously described c.145C>T mutation. The third novel mutation is a missense mutation in exon 4, c.451G>T, found in the homoallelic state in a patient from the United Arab Emirates. Expression studies of this mutation in COS-1 cells showed complete absence of the 85kDa precursor protein and no catalytic activity. The fourth novel mutation is a splicing mutation in intron 8, c.914+4A>G, found in the homoallelic state in two siblings from the United Arab Emirates. This study has revealed genetic heterogeneity of the beta-galactosidase deficiency in the Arabic population [corrected]
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Arpa J, Cruz-Martínez A, Campos Y, Gutiérrez-Molina M, García-Rio F, Pérez-Conde C, Martín MA, Rubio JC, Del Hoyo P, Arpa-Fernández A, Arenas J. Prevalence and progression of mitochondrial diseases: a study of 50 patients. Muscle Nerve 2003; 28:690-5. [PMID: 14639582 DOI: 10.1002/mus.10507] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
We report 50 patients with various clinical phenotypes of mitochondrial disease studied over the past 10 years in a large urban area (Madrid Health Area 5). The clinical phenotypes showed a large variety of abnormalities in molecular biology and biochemistry. The prevalence of mitochondrial diseases was found to be 5.7 per 100,000 in the population over 14 years of age. Clinical and electrophysiological assessment reveal signs of neuropathy in 10 patients. Electromyographic findings consistent with myopathy were obtained in 37 cases. Six patients died of medical complications. Disease phenotype influenced survival to some degree (P < 0.01). Age of onset and gender were not associated with differences in survival. Mitochondrial disease is thus far more common than expected and a common cause of chronic morbidity.
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Campos Y, García A, del Hoyo P, Jara P, Martín MA, Rubio JC, Berbel A, Barberá JR, Ribacoba R, Astudillo A, Cabello A, Ricoy JR, Arenas J. Two pathogenic mutations in the mitochondrial DNA tRNA Leu(UUR) gene (T3258C and A3280G) resulting in variable clinical phenotypes. Neuromuscul Disord 2003; 13:416-20. [PMID: 12798797 DOI: 10.1016/s0960-8966(03)00039-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
We studied two patients with ragged-red fibers and combined defects of the mitochondrial respiratory chain in their muscle biopsy. One had mitochondrial encephalomyopathy, lactic acidosis, and stroke-like episodes, and harbored a T3258C transition in the tRNA(Leu(UUR)) gene. The other showed myopathy plus cardiomyopathy and had an A3280G mutation in the same gene. Both mutations were heteroplasmic, abundant in muscle of the patients, less abundant in blood, and still less abundant in blood from their maternal relatives. In both patients, single muscle fiber analysis revealed greater abundance of mutant genomes in ragged-red fibers than in normal fibers, supporting the pathogenicity of both mutations.
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Castro-Gago M, Alonso A, Pintos-Martínez E, Novo-Rodríguez MI, Blanco-Barca MO, Campos Y, Arenas J, Eirís-Puñal J. [Multiple symmetric lipomatosis associated to polyneuropathology, atrophy of the cerebellum and mitochondrial cytopathy]. Rev Neurol 2003; 36:1026-9. [PMID: 12808497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
INTRODUCTION Multiple symmetric lipomatosis (MSL), which is predominantly found in middle aged males, is characterised by accumulations of fat in the neck, shoulders and other parts of the trunk, and sometimes associated with different neurological manifestations, both central and peripheral. Although its aetiology is unknown, it has been described as associated with mitochondrial cytopathies. AIMS. To describe the case of a young female with MSL associated with mitochondrial encephalomyopathy. CASE REPORT Girl aged 14 with MSL, ataxia, patellar hyperreflexia, bilateral Babinski sign, pes cavus, axonal peripheral neuropathy, involvement of the optic pathway, atrophy of the cerebellum, subsarcolemmal mitochondrial accumulations in the untrastructural examination of the vastus lateralis muscle and partial deficit of complex I in the mitochondrial respiratory chain. As regards molecular genetic aspects, the most frequent mutations of the ATPase 6 gene in lymphocytes, and mtDNA deletions and tRNALys and tRNALeu(UUR) mutations in muscles were excluded. CONCLUSIONS Despite the fact that MSL is an entity normally found in adults, the possibility of its being diagnosed in the paediatric age must be taken into account. This case is probably the second time MSL has been observed associated with mitochondrial cytopathy in this age bracket.
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Seijo-Martínez M, Castro del Río M, Campos Y, Palau F, Arenas J, Teijeira S, Fernández Hojas R, Navarro C. Unusual clinical findings and Complex III deficiency in a family with myotonic dystrophy. J Neurol Sci 2003; 208:87-91. [PMID: 12639730 DOI: 10.1016/s0022-510x(02)00442-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Myotonic dystrophy type 1 (DM1), an autosomal dominant disease characterized by a CTG expansion in the 3' region of the DMPK gene in chromosome 19, is a highly heterogeneous disease. In this study, we present a family with early onset-classical type DM, and a homogeneous phenotype highlighted by severe neuromuscular symptoms and mental dysfunction with subcortical-type dementia. Neuroradiological abnormalities included brain atrophy, white matter lesions, and basal ganglia calcifications. A very large CTG triplet expansion was present in the DMPK locus in leukocytes in the three patients. One patient showed ragged-red fibers (RRF) and a defect complex III of the respiratory chain, but no mutations were found in the cytochrome b gene of mtDNA.
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Torroni A, Campos Y, Rengo C, Sellitto D, Achilli A, Magri C, Semino O, García A, Jara P, Arenas J, Scozzari R. Mitochondrial DNA haplogroups do not play a role in the variable phenotypic presentation of the A3243G mutation. Am J Hum Genet 2003; 72:1005-12. [PMID: 12612863 PMCID: PMC1180329 DOI: 10.1086/373936] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2002] [Accepted: 12/26/2002] [Indexed: 11/03/2022] Open
Abstract
Thirty-five mitochondrial (mt) DNAs from Spain that harbor the mutation A3243G in association with either MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis, and strokelike episodes) syndrome or a wide array of disease phenotypes (ranging from diabetes and deafness to a mixture of chronic progressive external ophthalmoplegic symptoms and strokelike episodes) were studied by use of high-resolution restriction fragment length polymorphism analysis and control-region sequencing. A total of 34 different haplotypes were found, indicating that all instances of the A3243G mutation are probably due to independent mutational events. Haplotypes were distributed into 13 haplogroups whose frequencies were close to those of the general Spanish population. Moreover, there was no statistically significant difference in haplogroup distribution between patients with MELAS and those with disease phenotypes other than MELAS. Overall, these data indicate that the A3243G mutation harbors all the evolutionary features expected from a severely deleterious mtDNA mutation under strong negative selection, and they reveal that European mtDNA backgrounds do not play a substantial role in modulating the mutation's phenotypic expression.
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Carrozzo R, Bornstein B, Lucioli S, Campos Y, de la Pena P, Petit N, Dionisi-Vici C, Vilarinho L, Rizza T, Bertini E, Garesse R, Santorelli FM, Arenas J. Mutation analysis in 16 patients with mtDNA depletion. Hum Mutat 2003; 21:453-4. [PMID: 12655576 DOI: 10.1002/humu.9135] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Sixteen unrelated Southern European patients with the mitochondrial depletion syndrome (MDS) were analyzed for mutations in the TK2 and DGUOK genes. Three novel mutations were identified in TK2 (R183G, R254X, and 142insG). When we analyzed additional genes involved in the dNTPs pool, such as SLC25A19 (DNC) and NT5M (d-NT2), we did not detect mutations. The current study suggest that scanning the TK2, DGUOK, SLC25A19, and NT5M genes is likely to help about 10% of MDS families in terms of genetic counseling. Also, our findings indicate that genotype-phenotype correlations are not straightforward in MDS.
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Groener J, Maaswinkel-Mooy P, Smit V, van der Hoeven M, Bakker J, Campos Y, d'Azzo A. New mutations in two Dutch patients with early infantile galactosialidosis. Mol Genet Metab 2003; 78:222-8. [PMID: 12649068 DOI: 10.1016/s1096-7192(03)00005-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Galactosialidosis is an autosomal recessive lysosomal storage disease caused by a combined deficiency of lysosomal beta-galactosidase and neuraminidase as a result of a primary defect in the protective protein/cathepsin A (PPCA). We report the first 2 Dutch cases of early infantile galactosialidosis, both presenting with neonatal ascites. The defect was identified in urine, leukocytes, and fibroblasts. Residual activity was determined with a modified assay for cathepsin A and was <5% in leukocytes and <1% in fibroblasts. Histological examination of the placenta in case 1 showed extensive vacuolization in all cell types. Northern blot analysis of RNA isolated from the patients' cultured fibroblasts showed substantially decreased levels of the PPCA transcript, which nevertheless had the correct size of 2 kb. Mutation analysis of both mRNA and genomic DNA from the patients identified two novel mutations in the PPCA locus. Case 1 was a compound heterozygote, with a single missense mutation in one allele, which resulted in Gly57Ser amino acid substitution, and a single C insertion at nucleotide position 899 in the second allele, which gave rise to a frame shift and premature termination codon. Case 2 was homozygous for the same C899 insertion found in case 1.
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García-Velasco A, Gómez-Escalonilla C, Guerra-Vales JM, Cabello A, Campos Y, Arenas J. Intestinal pseudo-obstruction and urinary retention: cardinal features of a mitochondrial DNA-related disease. J Intern Med 2003; 253:381-5. [PMID: 12603507 DOI: 10.1046/j.1365-2796.2003.01095.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The syndrome of mitochondrial myopathy, encephalopathy, lactic acidosis and stroke-like episodes (MELAS) is a multisystemic disorder associated in most of the patients with an A to G transition at nucleotide position 3243 in the transfer RNA (tRNA)Leu(UUR) (A3243G) of the mitochondrial DNA. This syndrome is characterized by the preponderant involvement of skeletal muscle and central nervous system, but urinary or gastrointestinal symptoms are seldom documented. Here we report an unusual case of a 52-year-old woman with a clinical phenotype characterized by encephalopathy, left hemiparesis, urinary retention and gastrointestinal pseudo-obstruction. She had the classical A3243G mitochondrial DNA point mutation of MELAS syndrome. We also present a clinically heterogeneous multigenerational pedigree with several affected members in the maternal lineage.
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Arenas J, Fernández-Moreno MA, Molina JA, Fernández V, del Hoyo P, Campos Y, Calvo P, Martín MA, García A, Moreno T, Martínez-Salio A, Börnstein B, Bermejo F, Cabello A, Garesse R. Myoglobinuria and COX deficiency in a patient taking cerivastatin and gemfibrozil. Neurology 2003; 60:124-6. [PMID: 12525734 DOI: 10.1212/01.wnl.0000042050.85041.fb] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The authors describe a patient who presented with myoglobinuria after starting cerivastatin-gemfibrozil therapy. Muscle histochemistry revealed ragged-red fibers and cytochrome c oxidase negative (COX) fibers, and biochemistry showed a defect of COX activity. Immunoblot analysis showed a 60% reduction of COX I and COX II polypeptides. Cerivastatin myotoxicity might be related to a depletion of essential metabolites needed to anchor COX subunit I to mitochondrial membrane.
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Castro Gago M, Alonso Martín A, Pintos Martínez E, Novo Rodríguez MI, Blanco Barca MO, Campos Y, Arenas J, Eirís Puñal JM. Lipomatosis simétrica múltiple asociada a polineuropatía, atrofia de cerebelo y citopatía mitocondrial. Rev Neurol 2003. [DOI: 10.33588/rn.3611.2002519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Gómez L, Hernández R, Ibarra N, Valdés R, Campos Y, Tamayo A, Fernández D, Figueroa A, Alvarez T, Montero JA. Comparison of different ligand densities for the manufacture of CB Hep-1 immunosorbents. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 2002; 52:151-9. [PMID: 12376018 DOI: 10.1016/s0165-022x(02)00013-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Different ligand densities of monoclonal antibody (Mab) CB.Hep-1 were studied during covalent coupling on Sepharose CL-4B for recombinant hepatitis B surface antigen (rHBsAg) immunoaffinity purification. Ligand densities of 2.2, 3.2, 4.2 and 5.2 mg Mab/ml immunosorbents, respectively, were assayed during five cycles of immunoaffinity chromatography (IAC). Adsorption capacities averaged either 3.2 mg/ml (0.57 mg rHBsAg/ml immunosorbent/5.42 mg of total purified protein) or 5.2 mg/ml (0.56 mg rHBsAg/ml immunosorbent/5.05 mg total purified protein). Immunosorbents showed ligand leakage levels below 3 ng Mab/microg rHBsAg. Antigen purity was higher than 95% in all cases. The results suggest that a ligand density (LD) of 3.2 mg Mab/ml immunosorbent should be used for immunoaffinity chromatography because no significant differences were found in the ligand densities studied (P-value=0.012), which saves 40% of CB.Hep-1 immunosorbent manufacturing cost in comparison with 5 mg Mab/ml immunosorbent, which is currently used in large-scale production.
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García-Redondo A, Bustos F, Juan Y Seva B, Del Hoyo P, Jiménez S, Campos Y, Martín MA, Rubio JC, Cañadillas F, Arenas J, Esteban J. Molecular analysis of the superoxide dismutase 1 gene in Spanish patients with sporadic or familial amyotrophic lateral sclerosis. Muscle Nerve 2002; 26:274-8. [PMID: 12210393 DOI: 10.1002/mus.10193] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We performed a genetic analysis of the Cu/Zn superoxide dismutase gene (SOD1) in Spanish patients with sporadic or familial amyotrophic lateral sclerosis (ALS). We found mutations in 2 of 11 families (18%) with ALS. In addition, 1 of the 87 sporadic ALS patients studied harbored a mutation in the same gene. We identified G37R in exon 2 of the SOD1 gene in 1 family. Another patient, with sporadic ALS, showed a novel N65S in exon 3. In addition, we found a novel I112M in exon 4 in another family. Our data highlight the genetic heterogeneity of patients with ALS harboring mutations in the SOD1 gene and confirm that families with autosomal dominant inheritance of the trait, regardless of their ethnic background, are more likely to carry mutations in such a gene.
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Campos Y, Martín MA, Arenas J. [Molecular genetics of disorders of the mitochondrial respiratory chain]. Rev Neurol 2002; 35:153-8. [PMID: 12221629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Mitochondria have a key role in cell metabolism, being the major site of ATP production via oxidative phosphorylation. This system consists of five multiprotein complexes, whose individuals subunits are encoded either by the mitochondrial or by the nuclear genome. Respiratory chain enzyme deficiencies result in devastating, usually multisystem, disorders. Recently, many underlying mutations in mitochondrial and nuclear genes have been described at a brisk pace as a result of the advances in the knowledge of molecular genetics.
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Bornstein B, Mas JA, Fernández-Moreno MA, Campos Y, Martín MA, del Hoyo P, Rubio JC, Arenas J, Garesse R. The A8296G mtDNA mutation associated with several mitochondrial diseases does not cause mitochondrial dysfunction in cybrid cell lines. Hum Mutat 2002; 19:234-9. [PMID: 11857739 DOI: 10.1002/humu.10050] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Transmitochondrial cybrid cell lines homoplasmic for the A8296G mtDNA transition, a mutation associated with several mitochondrial diseases, have a normal oxidative phosphorylation function, as shown by oxygen consumption, lactate production, respiratory enzyme activities, and growth using galactose as the only source of energy. The synthesis of mitochondrial proteins is also similar in mutant and wild-type cybrids. Our results suggest that the A8296G mutation is a polymorphism and reinforce the necessity of performing functional studies to assess the pathogenicity of mtDNA mutations.
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Campos Y, García A, López A, Jiménez S, Rubio JC, Del Hoyo P, Bustos F, Martín MA, Cabello A, Ricoy JR, Arenas J. Cosegregation of the mitochondrial DNA A1555G and G4309A mutations results in deafness and mitochondrial myopathy. Muscle Nerve 2002; 25:185-8. [PMID: 11870684 DOI: 10.1002/mus.10012] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We report a patient with progressive external ophthalmoplegia (PEO), exercise intolerance, and deafness after aminoglycoside exposure, harboring two pathogenic mutations in her mtDNA: an A1555G in the 12S rRNA gene and a G4309A in the tRNA(Ile) gene. Muscle histochemistry showed abundant ragged-red fibers, and biochemistry revealed normal respiratory chain function. The A1555G mutation was homoplasmic in blood from the proband and from all maternal relatives. The G4309A mutation was abundant in the proband's muscle, less abundant in her blood, still less abundant in the mother's blood, and absent in blood from other maternal relatives. Family members were asymptomatic. Our data suggest that the former mutation resulted in aminoglycoside-induced deafness and the latter caused PEO plus exercise intolerance.
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Aguilera I, García-Lozano JR, Muñoz A, Arenas J, Campos Y, Chinchón I, Roldán AN, Bautista J. Mitochondrial DNA point mutation in the COI gene in a patient with McArdle's disease. J Neurol Sci 2001; 192:81-4. [PMID: 11701156 DOI: 10.1016/s0022-510x(01)00634-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We studied a 57-year-old female patient with clinical and biochemical evidences of McArdle's disease. Her muscle biopsy also revealed signs of mitochondrial proliferation, scattered RRF, and a deficit in complex I of the respiratory chain. Molecular genetic analysis showed that the patient was heterozygous for the most common mutation at codon 49 in the myophosphorylase gene. Mitochondrial DNA analysis of muscle tissue revealed an additional G-to-A transition at nucleotide position 7444 in the cytochrome c oxidase subunit I (COI) gene.
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MESH Headings
- Codon/genetics
- DNA Mutational Analysis
- DNA, Mitochondrial/genetics
- Electron Transport Complex I
- Electron Transport Complex IV/genetics
- Energy Metabolism/genetics
- Exons/genetics
- Female
- Glycogen/genetics
- Glycogen/metabolism
- Glycogen Phosphorylase, Muscle Form/deficiency
- Glycogen Phosphorylase, Muscle Form/genetics
- Glycogen Storage Disease Type V/genetics
- Glycogen Storage Disease Type V/metabolism
- Glycogen Storage Disease Type V/physiopathology
- Humans
- Middle Aged
- Mitochondria, Muscle/genetics
- Mitochondria, Muscle/metabolism
- Mitochondria, Muscle/pathology
- Muscle Fibers, Skeletal/metabolism
- Muscle Fibers, Skeletal/pathology
- Muscle, Skeletal/metabolism
- Muscle, Skeletal/pathology
- Muscle, Skeletal/physiopathology
- NADH, NADPH Oxidoreductases/deficiency
- NADH, NADPH Oxidoreductases/genetics
- Point Mutation/genetics
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Campos Y, García A, Eiris J, Fuster M, Rubio JC, Martín MA, del Hoyo P, Pintos E, Castro-Gago M, Arenas J. Mitochondrial myopathy, cardiomyopathy and psychiatric illness in a Spanish family harbouring the mtDNA 3303C > T mutation. J Inherit Metab Dis 2001; 24:685-7. [PMID: 11768589 DOI: 10.1023/a:1012719211505] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Martínez-Fernández E, Gil-Peralta A, García-Lozano R, Chinchón I, Aguilera I, Fernández-López O, Arenas J, Campos Y, Bautista J. Mitochondrial disease and stroke. Stroke 2001; 32:2507-10. [PMID: 11692008 DOI: 10.1161/hs1101.098328] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND AND PURPOSE It is well known that some mitochondrial disorders are responsible for ischemic cerebral infarction in young patients. Our purpose was to determine, in this prospective ongoing study, whether ischemic stroke is the only manifestation of a mitochondrial disorder in young patients. METHODS Patients aged </=50 years, admitted to the Stroke Unit from January 1999 to May 2000 with a diagnosis of ischemic stroke of unknown origin, were included in the study. All of them had full biochemical and hematologic tests, neuroimaging studies, transesophageal echocardiography, and extracranial and transcranial Doppler sonography. Patent foramen ovale was ruled out. Lactic acid concentrations were measured after anaerobic exercise of the forearm, and a morphological, biochemical, and molecular study after biceps muscle biopsy was performed. RESULTS Of the 18 patients so far included, 3 (17%) presented lactic acid hyperproduction after physical exercise, and 6 (33%) showed deficit of the mitochondrial respiratory chain complexes. The molecular analyses have confirmed mitochondrial mutations at base pairs 3243 (characteristic of mitochondrial encephalomyopathy, lactic acidosis, and strokelike episodes [MELAS]), 4216, and 15 928. CONCLUSIONS These results suggest that ischemic stroke may be the only manifestation or the initial manifestation of a mitochondrial disorder.
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Castro-Gago M, Pintos-Martínez E, Forteza-Vila J, Iglesias-Diz M, Ucieda-Somoza R, Silva-Villar I, Codesido-López J, Viso-Lorenzo A, Campos Y, Arenas J, Eirís-Puñal J. Congenital hydranencephalic-hydrocephalic syndrome with proliferative vasculopathy: a possible relation with mitochondrial dysfunction. J Child Neurol 2001; 16:858-62. [PMID: 11732774 DOI: 10.1177/08830738010160111401] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We report the case of a fetus aborted at gestation week 20 because of hydranencephalic-hydrocephalic syndrome. The fetus was the third pregnancy of a nonconsanguineous couple whose first child exhibited congenital hydranencephalic-hydrocephalic syndrome associated with muscle histology findings consistent with mitochondrial cytopathy and deficiency of complexes III and IV of the respiratory chain and whose second pregnancy had terminated in an elective abortion on detection of progressive hydrocephalus at gestation week 19. The third pregnancy had a normal course according to obstetric and ultrasonography examinations performed at gestation weeks 5, 10, and 15, and negative results were obtained in standard serologic and polymerase chain reaction (PCR) tests for prenatal infections of the mother. However, the ultrasonography examination at gestation week 18 revealed hydrocephalus, in response to which the parents requested an abortion, which was performed at gestation week 20; the fetus was male and with no evident external malformations. Histopathologic studies of the brain and medulla oblongata revealed proliferative vasculopathy (glomeruloid vessels, intracytoplasmic inclusions, and microcalcifications) and intracytoplasmic inclusions in the voluntary muscle. Microbiologic and PCR tests of hepatic and spleen tissue were negative for prenatal infections. In view of the precedent of a sister with mitochondrial dysfunction, these findings raise the pos sibility that at least some cases of familial syndrome of congenital hydranencephalic-hydrocephalic syndrome with proliferative vasculopathy can be attributed to alterations in the mitochondrial respiratory chain.
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Martín MA, Rubio JC, Buchbinder J, Fernández-Hojas R, del Hoyo P, Teijeira S, Gámez J, Navarro C, Fernández JM, Cabello A, Campos Y, Cervera C, Culebras JM, Andreu AL, Fletterick R, Arenas J. Molecular heterogeneity of myophosphorylase deficiency (McArdle's disease): a genotype-phenotype correlation study. Ann Neurol 2001; 50:574-81. [PMID: 11706962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
We report on 54 Spanish patients with McArdle's disease from 40 unrelated families. Molecular analysis revealed that the most common R49X mutation was present in 70% of patients and 55% of alleles. The G204S mutation was less frequent and found in 14.8% of patients and 9% of mutant alleles. The W797R mutation was observed in 16.5% of patients, accounting for 13.7% of mutant alleles. Moreover, 78% of mutant alleles among Spanish patients can be identified by using polymerase chain reaction-restriction fragment length polymorphism analysis for the R49X, G204S, and W797R mutations, which makes noninvasive diagnosis possible through molecular genetic analysis of blood DNA. Six novel mutations were found. Three were missense mutations, E348K, R601W, and A703V; two nonsense mutations, E124X and Q754X; and one single base pair deletion, 533 delA. No clear genotype-phenotype correlation emerges from our study. Most of the mutations of uncharged and solvent inaccessible residues and the truncations must disrupt the basic structure of the protein. The mutations of charged residues would be expected to interfere with internal hydrogen bonding networks, introducing severe incompatible partnering that is caused by poor packing or electrostatic repulsions.
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49
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de la Peña P, Bornstein B, del Hoyo P, Fernández-Moreno MA, Martín MA, Campos Y, Gómez-Escalonilla C, Molina JA, Cabello A, Arenas J, Garesse R. Mitochondrial dysfunction associated with a mutation in the Notch3 gene in a CADASIL family. Neurology 2001; 57:1235-8. [PMID: 11591842 DOI: 10.1212/wnl.57.7.1235] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Cerebral autosomal arteriopathy with subcortical infarcts and leukoencephalopathy (CADASIL) is characterized by recurrent subcortical ischemic strokes and dementia caused by mutations in the Notch3 gene. In Drosophila melanogaster, Notch signaling has a pleiotropic effect, affecting most tissues of the organism during development. OBJECTIVE To characterize a potential mitochondrial dysfunction associated with mutations in the Notch3 gene. METHODS Biochemical, histochemical, molecular, and genetic analyses were performed on muscle biopsy specimens and fibroblasts obtained from patients of a Spanish family with CADASIL. Additional biochemical and molecular analyses of the N(55e11) mutant of D. melanogaster were performed. RESULTS In muscle biopsy specimens, a significant decrease was found in the activity of complex I (NADH [reduced form of nicotinamide adenine dinucleotide] dehydrogenase), and in one patient, histochemical analysis showed the presence of ragged-red fibers with abnormal cytochrome c oxidase staining. Reduced fibroblast activity of complex V (ATP synthase) was found. Supporting data on patients with CADASIL, it was found that the mutation N(55e11) in Drosophila decreases the activity of mitochondrial respiratory complexes I and V. CONCLUSIONS Mitochondrial respiratory chain activity responds, directly or indirectly, to the Notch signaling pathway. Mitochondrial dysfunction in patients with CADASIL may be an epiphenomenon, but results of this study suggest that the pathophysiology of the disease could include a defect in oxidative phosphorylation.
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MESH Headings
- Adult
- Aged
- Dementia, Multi-Infarct/genetics
- Dementia, Multi-Infarct/metabolism
- Dementia, Multi-Infarct/pathology
- Electron Transport/genetics
- Electron Transport Complex I
- Electron Transport Complex IV/analysis
- Family Health
- Female
- Humans
- Male
- Middle Aged
- Mitochondria/enzymology
- Mitochondrial Myopathies/genetics
- Mitochondrial Myopathies/metabolism
- Mitochondrial Myopathies/pathology
- Muscle Fibers, Skeletal/enzymology
- Muscle Fibers, Skeletal/pathology
- Muscle, Skeletal/enzymology
- Muscle, Skeletal/pathology
- Mutation
- NADH, NADPH Oxidoreductases/metabolism
- Pedigree
- Proto-Oncogene Proteins/genetics
- Receptor, Notch3
- Receptors, Cell Surface
- Receptors, Notch
- Succinate Dehydrogenase/metabolism
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Campos Y, García-Redondo A, Fernández-Moreno MA, Martínez-Pardo M, Goda G, Rubio JC, Martín MA, del Hoyo P, Cabello A, Bornstein B, Garesse R, Arenas J. Early-onset multisystem mitochondrial disorder caused by a nonsense mutation in the mitochondrial DNA cytochrome C oxidase II gene. Ann Neurol 2001; 50:409-13. [PMID: 11558799 DOI: 10.1002/ana.1141] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We report the first nonsense mutation (G7896A) in the mtDNA gene for subunit II of cytochrome c oxidase (COX) in a patient with early-onset multisystem disease and COX deficiency in muscle. The mutation was heteroplasmic in muscle, blood, and fibroblasts from the patient and abundantly present in COX-deficient fibers, but less abundant in COX-positive fibers; it was not found in blood samples from the patient's asymptomatic maternal relatives. Immunoblot analysis showed a reduced concentration of both COX II and COX I polypeptides, suggesting impaired assembly of COX holoenzyme.
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