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Keyfi F, Abbaszadegan MR, Sankian M, Rolfs A, Orolicki S, Pournasrollah M, Alijanpour M, Varasteh A. Mutation analysis of genes related to methylmalonic acidemia: identification of eight novel mutations. Mol Biol Rep 2019; 46:271-285. [PMID: 30712249 DOI: 10.1007/s11033-018-4469-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 11/02/2018] [Indexed: 11/28/2022]
Abstract
Methylmalonic acidemia (MMA), an inherited metabolic disease, results from genetic defects in methylmalonyl-CoA mutase or any of the proteins involved in adenosylcobalamin synthesis. This enzyme is classified into several complementation groups and genotypic classes. In this work we explain the biochemical, structural and genetic analysis of 25 MMA patients, from Iran. The diagnosis was established by the measurement of propionylcarnitine in blood using tandem mass spectrometry and confirmed using a gas chromatography-flame ionization detector. Using clinical, biochemical, structural and molecular analyses we identified 15 mut MMA, three cblA, one cblB, and four cblC-deficient patients. Among mutations identified in the MUT gene (MUT) only one, the c.1874A>C (p.D625A) variant, is likely a mut- mutation. The remaining mutations are probably mut0. Here, we present the first molecular analysis of MMA in Iranian patients and have identified eight novel mutations. Four novel mutations (p.D625A, p.R326G, p.V157F, p.F379L) were seen exclusively in patients from northern Iran. One novel splice site mutation (c.2125-3C>G) in MUT and two novel mutation (p.N225M and p.A99P) in the MMAA gene were associated with patients from eastern Iran. The rs184829210 SNP was recognized only in patients with the novel c.958G>A (p.A320T) mutation. This study confirms pathogenesis of deficient enzyme activity in MUT, MMAA, MMAB, and MMACHC as previous observations. These results could act as a basis for the performance of pharmacological therapies for increasing the activity of proteins derived from these mutations.
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Affiliation(s)
- Fatemeh Keyfi
- Department of Medical Laboratory Sciences, Varastegan Institute for Medical Sciences, Mashhad, Iran.,Division of Metabolic disorders, Pardis Clinical and Genetic Laboratory, Mashhad, Iran.,Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad R Abbaszadegan
- Division of Human Genetics, Immunology Research Center, Avicenna Research Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mojtaba Sankian
- Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Arndt Rolfs
- Albrecht Kossel Institute for Neuroregeneration, University of Rostock, Rostock, Germany.,Chief Medical Director, Centogene AG, Rostock, Germany
| | | | - Mohammad Pournasrollah
- Non-contagious pediatric disease Research Center, Babol University of Medical Sciences, Babol, Iran
| | - Morteza Alijanpour
- Non-contagious pediatric disease Research Center, Babol University of Medical Sciences, Babol, Iran
| | - Abdolreza Varasteh
- Department of Medical Laboratory Sciences, Varastegan Institute for Medical Sciences, Mashhad, Iran. .,Division of Metabolic disorders, Pardis Clinical and Genetic Laboratory, Mashhad, Iran. .,Allergy Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
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Kumari C, Kapoor S, Varughese B, Pollipali SK, Ramji S. Mutation Analyses in Selected Exons of the MUT Gene in Indian Patients with Methylmalonic Acidemia. Indian J Clin Biochem 2016; 32:266-274. [PMID: 28811685 DOI: 10.1007/s12291-016-0600-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Accepted: 07/29/2016] [Indexed: 01/27/2023]
Abstract
Deficiency or diminished activity of a cobalamin dependent enzyme methylmalonyl-CoA mutase causes inborn error of metabolism called methylmalonic acidemia (MMA). In this study we elucidated the spectrum of mutations in 21 Indian mut MMA patients by direct sequencing. Sequence analysis identified a total of 70 mutations in exon 2, 9, 11 and 12 of MUT gene. Out of which 26 mutations were predicted to be deleterious and rest were benign. The 23 novel mutations consist of four nonsense mutations (p.N6*, p.G539*, p.E609* and p.I671*), twelve missense mutations (p.K128I, p.N547T, p.D554Y, p.A558T, p.R559P, p.A631T, p.I647T, p.E656D, p.V657E, p.Q660H, p.K679N, and p.G696Y) and seven frame shift mutations (c.375_376insA, c.1642delA, c.1655delC, c.1825_1826insT, c.1957delGA, c.2014delA and c.2062_2063insGA). All of them are point mutations or micro rearrangements. Three of these mutations (p.K621N, p.G648D, p.G630E) have been previously reported; all of them are missense mutations. The mutations are distributed throughout the exon 2, 9, 11 and 12, 38.4 % mutation are located in exon 12.
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Affiliation(s)
- Chandrawati Kumari
- Pediatrics Genetic and Research Laboratory, Department of Pediatrics, Maulana Azad Medical College, New Medical Block, Opposite Old Casualty, Lok Nayak Hospital, New Delhi, 110002 India
| | - Seema Kapoor
- Pediatrics Genetic and Research Laboratory, Department of Pediatrics, Maulana Azad Medical College, New Medical Block, Opposite Old Casualty, Lok Nayak Hospital, New Delhi, 110002 India
| | - Bijo Varughese
- Pediatrics Genetic and Research Laboratory, Department of Pediatrics, Maulana Azad Medical College, New Medical Block, Opposite Old Casualty, Lok Nayak Hospital, New Delhi, 110002 India
| | - Sunil Kumar Pollipali
- Pediatrics Genetic and Research Laboratory, Department of Pediatrics, Maulana Azad Medical College, New Medical Block, Opposite Old Casualty, Lok Nayak Hospital, New Delhi, 110002 India
| | - Siddarth Ramji
- Department of Neonatology, Maulana Azad Medical College, New Delhi, 110002 India
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Abstract
Vitamin B12 (cobalamin, Cbl) is an essential nutrient in human metabolism. Genetic diseases of vitamin B12 utilisation constitute an important fraction of inherited newborn disease. Functionally, B12 is the cofactor for methionine synthase and methylmalonyl CoA mutase. To function as a cofactor, B12 must be metabolised through a complex pathway that modifies its structure and takes it through subcellular compartments of the cell. Through the study of inherited disorders of vitamin B12 utilisation, the genes for eight complementation groups have been identified, leading to the determination of the general structure of vitamin B12 processing and providing methods for carrier testing, prenatal diagnosis and approaches to treatment.
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Cosson MA, Touati G, Lacaille F, Valayannnopoulos V, Guyot C, Guest G, Verkarre V, Chrétien D, Rabier D, Munnich A, Benoist JF, de Keyzer Y, Niaudet P, de Lonlay P. Liver hepatoblastoma and multiple OXPHOS deficiency in the follow-up of a patient with methylmalonic aciduria. Mol Genet Metab 2008; 95:107-9. [PMID: 18676166 DOI: 10.1016/j.ymgme.2008.06.007] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2008] [Accepted: 06/13/2008] [Indexed: 10/21/2022]
Abstract
A boy who was diagnosed with methylmalonic aciduria (MMA) at the age of 10 days developed persistent hepatomegaly and raised transaminases from the age of 4 years. He was subsequently diagnosed with Leigh syndrome and required a kidney transplantation for end-stage renal failure. A massive hepatoblastoma led to his death by the age of 11 years. Methylmalonyl-CoA mutase activity was undetectable on both cultured skin fibroblasts and kidney biopsy and multiple respiratory chain deficiency was demonstrated in the kidney. Mitochondrial dysfunction and/or post-transplant immunosuppressive therapy should be considered as a possible cause of liver cancer in this patient.
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Affiliation(s)
- M A Cosson
- Metabolic unit, Reference Center, Necker-Enfants Malades Hospital, University Paris Descartes, 149 rue de Sèvres, 75009 Paris, France
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Oyama C, Takahashi T, Matsumori M, Shoji Y, Tajima G, Sakura N, Hasegawa Y, Yamaguchi S, Kakinuma H, Takada G. Novel mutation of methylmalonyl-CoA mutase gene causing the mut0 form of methylmalonic acidemia in a Japanese girl. Pediatr Int 2007; 49:232-4. [PMID: 17445044 DOI: 10.1111/j.1442-200x.2007.02325.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Chikako Oyama
- Department of Pediatrics, Akita University School of Medicine, Akita, Japan
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Abstract
BACKGROUND Patients with a defect in methylmalonyl-coenzyme A mutase (MCM) are classified as having methylmalonic acidemia, which is divided into two subclasses: mut(0) and mut(-). Fifty-five disease-causing mutations have been identified. Although most are private mutations, only three (E117X, G717V, and N219Y) are reportedly common in Japanese, Black, and Caucasian populations, respectively. Here we identified mutations in 11 Japanese patients with MCM deficiency. METHODS Mutational analysis was performed in 11 unrelated Japanese patients with MCM deficiency using polymerase chain reaction and direct sequencing. RESULTS Three novel (L494X, R727X, and 449_461del) and six previously reported (R93H, E117X, N219Y, R369H, G648D and IVS2 + 5G>A) mutations were identified. The L494X mutation was found in three unrelated patients, and the R93H, E117X, R369H, G648D, and IVS2 + 5G>A mutations occurred more than once. Two of the patients were classified as mut(-) phenotype because of residual [(14)C]-propionate incorporation in the presence of a high concentration of hydroxocobalamin. The two mut(-) patients were heterozygous for the G648D mutation and presented with lethargy and metabolic acidosis after 2 years of life. Their psychomotor development has been documented as normal. The patients with the R727X or c.374_385del [corrected] mutations clinically exhibited mut(0) phenotype. Two patients with mut(0) phenotype died in infancy. One presented early in the neonatal period; the other was symptomatic in the late infantile period. CONCLUSIONS The L494X, R93H, E117X, R369H, G648D, and IVS2 + 5G>A mutations are found in more than two unrelated families in the Japanese population. The short-term outcome was generally poor in patients with mut(0), and therefore alternative treatments should be considered.
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Affiliation(s)
- Azusa Kobayashi
- Department of Pediatrics, Kanazawa Medical University, Ishikawa, Japan
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Martínez MA, Rincón A, Desviat LR, Merinero B, Ugarte M, Pérez B. Genetic analysis of three genes causing isolated methylmalonic acidemia: identification of 21 novel allelic variants. Mol Genet Metab 2005; 84:317-25. [PMID: 15781192 DOI: 10.1016/j.ymgme.2004.11.011] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2004] [Revised: 11/23/2004] [Accepted: 11/29/2004] [Indexed: 11/20/2022]
Abstract
Isolated methylmalonic aciduria (MMA) is an inborn error of metabolism due to the impaired isomerization of l-methylmalonyl-CoA to succinyl-CoA. This reaction is catalyzed by the mitochondrial protein methylmalonyl-CoA mutase (MCM, EC 5.4.99.2), an adenosylcobalamin-dependent enzyme. Four different forms of isolated MMA have been described: mut MMA associated with defects in the MCM apoenzyme, and phenotypically divided into two subtypes mut- and mut0 MMA, and three different defects involved in the synthesis of the active form of the cofactor adenosylcobalamin, termed cbl MMA, and classified into three different complementation groups cblA, cblB, and cblH associated with defects in the MMAA and MMAB genes and with an unidentified protein, respectively. In this work we describe the genetic analysis of 25 MMA patients, mainly from Spain. Using biochemical and cellular approaches our patients have been classified, identifying 13 mut MMA, 7 cblA, 2 cblB, and 3 noncblA, noncblB deficient patients. cDNA and genomic DNA sequence analysis of the MUT, MMAA, and MMAB genes have allowed us to identify 27 different changes, 21 novel ones. Among the missense mutations identified in the MUT gene only one, the c.970G>A (p.A324T) variant located in the substrate binding domain is likely a mut- mutation. The remaining missense mutations c.326A>G (p.Q109R), c.983T>C (p.L328P), c.1846C>T (p.R616C), and c.1850T>G (p.L617R) are probably mut0. In the MMAA patients analyzed, frameshift mutations are prevalent. We have explored the genotype-phenotype correlation for this clinically heterogeneous disease.
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Acquaviva C, Benoist JF, Pereira S, Callebaut I, Koskas T, Porquet D, Elion J. Molecular basis of methylmalonyl‐CoA mutase apoenzyme defect in 40 European patients affected by
mut
° and
mut
– forms of methylmalonic acidemia: Identification of 29 novel mutations in the MUT gene. Hum Mutat 2005; 25:167-76. [PMID: 15643616 DOI: 10.1002/humu.20128] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Methylmalonyl-CoA mutase (MCM) apoenzyme deficiency is a rare metabolic disease that may result in distinct biochemical phenotypes of methylmalonic acidemia (MMA), namely mut(o) and mut-. We analyzed a cohort of 40 MCM-deficient patients with MMA affected by either the mut(o) or the mut- form of the disease. By direct sequencing of cDNA and gDNA of the MUT gene, we detected 42 mutations, 29 of which were novel mutations. These included five frameshift mutations (insertion, deletion, or duplication of a single nucleotide), five sequence modifications in consensus splice sites, six nonsense and 12 missense mutations, and a large genomic deletion including exon 12. We explored how the 12 novel missense mutations might cause the observed phenotype by mapping them onto a three-dimensional model of the human MCM generated by homology with the P. shermanii enzyme. In this work we update the spectrum of MCM mutations (n=84), and then discuss their prevalence and distribution throughout the coding sequence in relation to the enzyme structure.
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Affiliation(s)
- Cécile Acquaviva
- Fédération de Génétique, Assistance Publique-Hôpitaux de Paris, Hôpital Robert Debré, Paris, France
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Kakinuma H, Kobayashi A, Takahashi H. 14C-propionate incorporation assay by rapid filtration in multiwell plates. Clin Chim Acta 2004; 343:209-12. [PMID: 15115697 DOI: 10.1016/j.cccn.2004.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2003] [Revised: 01/21/2004] [Accepted: 01/21/2004] [Indexed: 11/30/2022]
Abstract
BACKGROUND Methylmalonic aciduria (MMA) is divided into two groups according to cobalamin dependency, and this classification is important for treatment. Unfortunately, there has been no rapid and reliable method for the evaluation of cobalamin dependency. METHODS [14C]-propionate incorporation into intact cells in the presence of either media alone or media containing various amounts of cobalamin was measured using a 96-well filtration plate and vacuum manifold. Incorporation of radioactivity was measured by direct microplate scintillation. RESULTS Using peripheral white blood cells from normal individuals, we obtained a linear relationship between the rate of 14C-propionate incorporation and the number of cells over a broad range (10,000 to 100,000 cells/well). 14C-propionate incorporation in cells from eight patients was 1% to 13% of parallel controls. CONCLUSIONS In this report, we describe a rapid, sensitive and reliable method for evaluating the cobalamin dependency of methylmalonic aciduria.
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Affiliation(s)
- Hiroaki Kakinuma
- Department of Pediatrics, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Ishikawa 920-0293, Japan.
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Champattanachai V, Ketudat Cairns JR, Shotelersuk V, Keeratichamroen S, Sawangareetrakul P, Srisomsap C, Kaewpaluek V, Svasti J. Novel mutations in a Thai patient with methylmalonic acidemia. Mol Genet Metab 2003; 79:300-2. [PMID: 12948746 DOI: 10.1016/s1096-7192(03)00106-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Thai patient with methylmalonic acidemia (MMA) and no methylmalonyl-CoA mutase (MCM, EC 5.4.99.2) activity in leukocytes in the presence of deoxyadenosyl cobalamin (mut(0)) was found to be heterozygous for two novel mutations: 1048delT and 1706_1707delGGinsTA (G544X), inherited from her mother and father, respectively. The proband was also heterozygous for the polymorphism, A499T, which did not affect the activity of recombinant MCM.
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Affiliation(s)
- Voraratt Champattanachai
- Laboratory of Biochemistry, Chulabhorn Research Institute, Vipavadee-Rangsit Highway, Bangkok 10210, Thailand
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Acquaviva C, Benoist JF, Callebaut I, Guffon N, Ogier de Baulny H, Touati G, Aydin A, Porquet D, Elion J. N219Y, a new frequent mutation among mut(degree) forms of methylmalonic acidemia in Caucasian patients. Eur J Hum Genet 2001; 9:577-82. [PMID: 11528502 DOI: 10.1038/sj.ejhg.5200675] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2000] [Revised: 03/13/2001] [Accepted: 05/02/2001] [Indexed: 11/09/2022] Open
Abstract
Mutations in the MUT locus encoding for the methylmalonyl-CoA mutase (MCM) apoenzyme are responsible for the mut forms of methylmalonic acidemia (MMA). To date, 49 different mutations have been identified in mut MMA. Only two frequent mutations have been reported in the Japanese population and in African-Americans. Here we report a new missense mutation N219Y (731 A-->T) which we found in five unrelated families of French and Turkish descent. All the patients exhibited a severe mut(degree) phenotype and three of them were homozygotes for N219Y. Direct involvement of the mutation in the loss of enzyme activity was demonstrated by mutagenesis and transient expression study. Mapping of the mutation onto a three-dimensional model of human MCM constructed by homology with the Propionibacterium shermanii enzyme shows that it lies in a highly conserved secondary structure motif and might suggest impaired folding and/or poor stability compatible with the mut(degree) phenotype. Finally, a 1% N219Y carrier frequency was observed in a French anonymous control population. Thus, N219Y is the first frequent mut mutation to be reported in the Caucasian population.
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Affiliation(s)
- C Acquaviva
- Service de Biochimie-Génétique/INSERM U458, Assistance Publique-Hôpitaux de Paris, Hôpital Robert Debré, Paris, France
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