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https://www.readbyqxmd.com/read/27906631/mitochondrial-purine-and-pyrimidine-metabolism-and-beyond
#1
Liya Wang
Carefully balanced deoxynucleoside triphosphate (dNTP) pools are essential for both nuclear and mitochondrial genome replication and repair. Two synthetic pathways operate in cells to produce dNTPs, e.g., the de novo and the salvage pathways. The key regulatory enzymes for de novo synthesis are ribonucleotide reductase (RNR) and thymidylate synthase (TS), and this process is considered to be cytosolic. The salvage pathway operates both in the cytosol (TK1 and dCK) and the mitochondria (TK2 and dGK). Mitochondrial dNTP pools are separated from the cytosolic ones owing to the double membrane structure of the mitochondria, and are formed by the salvage enzymes TK2 and dGK together with NMPKs and NDPK in postmitotic tissues, while in proliferating cells the mitochondrial dNTPs are mainly imported from the cytosol produced by the cytosolic pathways...
December 2016: Nucleosides, Nucleotides & Nucleic Acids
https://www.readbyqxmd.com/read/27853460/pre-sowing-seed-treatment-with-24-epibrassinolide-ameliorates-pesticide-stress-in-brassica-juncea-l-through-the-modulation-of-stress-markers
#2
Anket Sharma, Sharad Thakur, Vinod Kumar, Mukesh K Kanwar, Anup K Kesavan, Ashwani K Thukral, Renu Bhardwaj, Pravej Alam, Parvaiz Ahmad
The present experiment was designed to assess the effects of seed soaking with 24-epibrassinolide (EBR) on the physiology of Brassica juncea L. seedlings grown under imidacloprid (IMI) toxicity. Application of EBR increased the length of seedlings, dry weight, and pigment contents, polyphenols, total phenols, and organic acids under IMI toxicity. The expression of genes coding key enzymes of pigment, phenols, polyphenols, and organic acid biosynthetic pathways was also studied including CHLASE (chlorophyllase), PSY (phytoene synthase), CHS (chalcone synthase) and PAL (phenylalanine ammonialyase), CS (citrate synthase), SUCLG1 (succinyl Co-A ligase,), SDH (succinate dehydrogenase), FH (fumarate hydratase), MS (malate synthase)...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27496549/two-transgenic-mouse-models-for-%C3%AE-subunit-components-of-succinate-coa-ligase-yielding-pleiotropic-metabolic-alterations
#3
Gergely Kacso, Dora Ravasz, Judit Doczi, Beáta Németh, Ory Madgar, Ann Saada, Polina Ilin, Chaya Miller, Elsebet Ostergaard, Iordan Iordanov, Daniel Adams, Zsuzsanna Vargedo, Masatake Araki, Kimi Araki, Mai Nakahara, Haruka Ito, Aniko Gál, Mária J Molnár, Zsolt Nagy, Attila Patocs, Vera Adam-Vizi, Christos Chinopoulos
Succinate-CoA ligase (SUCL) is a heterodimer enzyme composed of Suclg1 α-subunit and a substrate-specific Sucla2 or Suclg2 β-subunit yielding ATP or GTP, respectively. In humans, the deficiency of this enzyme leads to encephalomyopathy with or without methylmalonyl aciduria, in addition to resulting in mitochondrial DNA depletion. We generated mice lacking either one Sucla2 or Suclg2 allele. Sucla2 heterozygote mice exhibited tissue- and age-dependent decreases in Sucla2 expression associated with decreases in ATP-forming activity, but rebound increases in cardiac Suclg2 expression and GTP-forming activity...
October 15, 2016: Biochemical Journal
https://www.readbyqxmd.com/read/27484306/expanding-the-phenotypic-spectrum-of-succinyl-coa-ligase-deficiency-through-functional-validation-of-a-new-suclg1-variant
#4
Taraka R Donti, Ruchi Masand, Daryl A Scott, William J Craigen, Brett H Graham
Deficiency of the TCA cycle enzyme Succinyl-CoA Synthetase/Ligase (SCS), due to pathogenic variants in subunits encoded by SUCLG1 and SUCLA2, causes mitochondrial encephalomyopathy, methylmalonic acidemia, and mitochondrial DNA (mtDNA) depletion. In this study, we report an 11year old patient who presented with truncal ataxia, chorea, hypotonia, bilateral sensorineural hearing loss and preserved cognition. Whole exome sequencing identified a heterozygous known pathogenic variant and a heterozygous novel missense variant of uncertain clinical significance (VUS) in SUCLG1...
September 2016: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/27233228/next-generation-sequencing-of-patients-with-mut-methylmalonic-aciduria-validation-of-somatic-cell-studies-and-identification-of-16-novel-mutations
#5
Jordan Chu, Mihaela Pupavac, David Watkins, Xia Tian, Yanming Feng, Stella Chen, Remington Fenter, Victor W Zhang, Jing Wang, Lee-Jun Wong, David S Rosenblatt
Mutations in the MUT gene, which encodes the mitochondrial enzyme methylmalonyl-CoA mutase, are responsible for the mut form of methylmalonic aciduria (MMA). In this study, a next generation sequencing (NGS) based gene panel was used to analyze 53 patients that had been diagnosed with mut MMA by somatic cell complementation analysis. A total of 54 different mutations in MUT were identified in 48 patients; 16 novel mutations were identified, including 1 initiation site mutation (c.2T>C [p.M1?]), 1 missense mutation (c...
August 2016: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/27143079/-clinical-and-laboratory-studies-on-four-chinese-patients-with-succinate-coa-ligase-deficiency-noticed-by-mild-methylmalonic-aciduria
#6
Y P Liu, X Y Li, Y Ding, Q Wang, J Q Song, Y Zhang, D X Li, Y P Qin, Y L Yang
OBJECTIVE: To study the clinical and genetic features of the patients with secondary methylmalonic aciduria due to succinate-CoA ligase deficiency. METHOD: From February 2011 to April 2014, 4 Chinese patients with succinate-CoA ligase deficiency and mild methylmalonic aciduria were enrolled in this study. The clinical course, biochemical features, brain MRI findings, and mutations were analyzed. RESULT: Four patients presented with severe psychomotor retardation, hypotonia, seizures, feeding problems and failure to thrive from the age of one day to 6 months...
May 2016: Zhonghua Er Ke za Zhi. Chinese Journal of Pediatrics
https://www.readbyqxmd.com/read/26859764/first-identification-of-the-toxicity-of-microcystins-on-pancreatic-islet-function-in-humans-and-the-involved-potential-biomarkers
#7
Yanyan Zhao, Qingju Xue, Xiaomei Su, Liqiang Xie, Yunjun Yan, Lixiao Wang, Alan D Steinman
Microcystins (MCs) produced by cyanobacteria have been recognized as a major public health threat. However, the toxicity of MCs to humans is still largely unknown. In this study, we examined the changes in pancreatic islet function in fishers exposed to ambient levels of MCs at Lake Taihu and, using a mouse model, explored the molecular mechanisms involved in toxicity. MCs content in the serum of fishers tested positive, with a range from 0.10 to 0.64 μg/L. Both lower blood insulin levels (2.26 ± 0.96 μIU/mL) and impaired fasting glucose were found in participants from the Meiliang Bay area in Lake Taihu, where MC-LR levels were substantially greater than the MC threshold established by WHO for drinking water...
March 15, 2016: Environmental Science & Technology
https://www.readbyqxmd.com/read/26827111/added-value-of-next-generation-gene-panel-analysis-for-patients-with-elevated-methylmalonic-acid-and-no-clinical-diagnosis-following-functional-studies-of-vitamin-b12-metabolism
#8
Mihaela Pupavac, Xia Tian, Jordan Chu, Guoli Wang, Yanming Feng, Stella Chen, Remington Fenter, Victor W Zhang, Jing Wang, David Watkins, Lee-Jun Wong, David S Rosenblatt
Next generation sequencing (NGS) based gene panel testing is increasingly available as a molecular diagnostic approach for inborn errors of metabolism. Over the past 40 years patients have been referred to the Vitamin B12 Clinical Research Laboratory at McGill University for diagnosis of inborn errors of cobalamin metabolism by functional studies in cultured fibroblasts. DNA samples from patients in which no diagnosis was made by these studies were tested by a NGS gene panel to determine whether any molecular diagnoses could be made...
March 2016: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/26475597/succinate-coa-ligase-deficiency-due-to-mutations-in-sucla2-and-suclg1-phenotype-and-genotype-correlations-in-71-patients
#9
Rosalba Carrozzo, Daniela Verrigni, Magnhild Rasmussen, Rene de Coo, Hernan Amartino, Marzia Bianchi, Daniela Buhas, Samir Mesli, Karin Naess, Alfred Peter Born, Berit Woldseth, Paolo Prontera, Mustafa Batbayli, Kirstine Ravn, Fróði Joensen, Duccio M Cordelli, Filippo Maria Santorelli, Mar Tulinius, Niklas Darin, Morten Duno, Philippe Jouvencel, Alberto Burlina, Gabriela Stangoni, Enrico Bertini, Isabelle Redonnet-Vernhet, Flemming Wibrand, Carlo Dionisi-Vici, Johanna Uusimaa, Paivi Vieira, Andrés Nascimento Osorio, Robert McFarland, Robert W Taylor, Elisabeth Holme, Elsebet Ostergaard
BACKGROUND: The encephalomyopathic mtDNA depletion syndrome with methylmalonic aciduria is associated with deficiency of succinate-CoA ligase, caused by mutations in SUCLA2 or SUCLG1. We report here 25 new patients with succinate-CoA ligase deficiency, and review the clinical and molecular findings in these and 46 previously reported patients. PATIENTS AND RESULTS: Of the 71 patients, 50 had SUCLA2 mutations and 21 had SUCLG1 mutations. In the newly-reported 20 SUCLA2 patients we found 16 different mutations, of which nine were novel: two large gene deletions, a 1 bp duplication, two 1 bp deletions, a 3 bp insertion, a nonsense mutation and two missense mutations...
March 2016: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/26435418/silac-based-proteomic-analysis-reveals-that-salidroside-antagonizes-cobalt-chloride-induced-hypoxic-effects-by-restoring-the-tricarboxylic-acid-cycle-in-cardiomyocytes
#10
Zhong-Wei Xu, Xi Chen, Xiao-Han Jin, Xiang-Yan Meng, Xin Zhou, Feng-Xu Fan, Shi-Yun Mao, Yue Wang, Wen-Cheng Zhang, Na-Na Shan, Yu-Ming Li, Rui-Cheng Xu
Hypoxic status alters the energy metabolism and induces cell injury in cardiomyocytes, and it further triggers the occurrence and development of cardiovascular diseases. Our previous studies have shown that salidroside (SAL) exhibits anti-hypoxic activity. However, the mechanisms remain obscure. In the present study, we successfully screened 92 different expression proteins in CoCl2-induced hypoxic conditions, 106 different expression proteins in the SAL-mediated anti-hypoxic group were compared with the hypoxic group using quantitative proteomics strategy, respectively...
January 1, 2016: Journal of Proteomics
https://www.readbyqxmd.com/read/26028457/five-novel-suclg1-mutations-in-three-chinese-patients-with-succinate-coa-ligase-deficiency-noticed-by-mild-methylmalonic-aciduria
#11
Yupeng Liu, Xiyuan Li, Qiao Wang, Yuan Ding, Jinqing Song, Yanling Yang
OBJECTIVE: Methylmalonic aciduria is the most common organic aciduria in mainland China. Succinate-CoA ligase deficiency causes encephalomyopathy with mitochondrial DNA depletion and mild methylmalonic aciduria. Patients usually present with severe encephalomyopathy, infantile lactic acidosis, which can be fatal, and mild methylmalonic aciduria. PATIENTS AND METHODS: Three Chinese patients (two boys and one girl) were hospitalized because of severe encephalomyopathy between 7 and 9 months...
January 2016: Brain & Development
https://www.readbyqxmd.com/read/25859558/analysis-and-interpretation-of-transcriptomic-data-obtained-from-extended-warburg-effect-genes-in-patients-with-clear-cell-renal-cell-carcinoma
#12
Edward Sanders, Svenja Diehl
BACKGROUND: Many cancers adopt a metabolism that is characterized by the well-known Warburg effect (aerobic glycolysis). Recently, numerous attempts have been made to treat cancer by targeting one or more gene products involved in this pathway without notable success. This work outlines a transcriptomic approach to identify genes that are highly perturbed in clear cell renal cell carcinoma (CCRCC). METHODS: We developed a model of the extended Warburg effect and outlined the model using Cytoscape...
2015: Oncoscience
https://www.readbyqxmd.com/read/25287014/integrative-analysis-of-transcriptomics-proteomics-and-metabolomics-data-of-white-adipose-and-liver-tissue-of-high-fat-diet-and-rosiglitazone-treated-insulin-resistant-mice-identified-pathway-alterations-and-molecular-hubs
#13
David Meierhofer, Christopher Weidner, Sascha Sauer
The incidences of obesity and type 2 diabetes are rapidly increasing and have evolved into a global epidemic. In this study, we analyzed the molecular effects of high-fat diet (HFD)-induced insulin-resistance on mice in two metabolic target tissues, the white adipose tissue (WAT) and the liver. Additionally, we analyzed the effects of drug treatment using the specific PPARγ ligand rosiglitazone. We integrated transcriptome, proteome, and metabolome data sets for a combined holistic view of molecular mechanisms in type 2 diabetes...
December 5, 2014: Journal of Proteome Research
https://www.readbyqxmd.com/read/24659738/a-novel-sucla2-mutation-in-a-portuguese-child-associated-with-mild-methylmalonic-aciduria
#14
Célia Nogueira, Maria Chiara Meschini, Claudia Nesti, Paula Garcia, Luisa Diogo, Carla Valongo, Ricardo Costa, Arnaldo Videira, Laura Vilarinho, Filippo M Santorelli
Succinyl-coenzyme A synthase is a mitochondrial matrix enzyme that catalyzes the reversible synthesis of succinate and adenosine triphosphate (ATP) from succinyl-coenzyme A and adenosine diphosphate (ADP) in the tricarboxylic acid cycle. This enzyme is made up of α and β subunits encoded by SUCLG1 and SUCLA2, respectively. We present a child with severe muscular hypotonia, dystonia, failure to thrive, sensorineural deafness, and dysmorphism. Metabolic investigations disclosed hyperlactacidemia, moderate urinary excretion of methylmalonic acid, and elevated levels of C4-dicarboxylic carnitine in blood...
February 2015: Journal of Child Neurology
https://www.readbyqxmd.com/read/24269713/measurement-of-succinyl-carnitine-and-methylmalonyl-carnitine-on-dried-blood-spot-by-liquid-chromatography-tandem-mass-spectrometry
#15
Cristiano Rizzo, Sara Boenzi, Rita Inglese, Giancarlo la Marca, Maurizio Muraca, Tegra Barreiro Martinez, David W Johnson, Eleonora Zelli, Carlo Dionisi-Vici
Methylmalonic aciduria (MMA) is one of the most frequent organic acidurias, a class of diseases caused by enzymatic defects mainly involved in the catabolism of branched-chain amino acids. Recently, mild MMA and C4-dicarboxylyl-carnitine (C4DC-C) accumulation have been reported in patients carrying mutation in genes encoding the α-subunit (SUCLG1) and the β-subunit (SUCLA2) of the ADP-forming succinyl-CoA synthetase (SCS). We developed a liquid chromatography-tandem mass spectrometry (LC-MS/MS) method to quantify in dried blood spot the two isobaric compounds of C4DC-C, succinyl-carnitine and methylmalonyl-carnitine, to allow the differential diagnosis between classical MMA and SCS-related defects...
February 15, 2014: Clinica Chimica Acta; International Journal of Clinical Chemistry
https://www.readbyqxmd.com/read/23385875/mitochondrial-dna-depletion-syndromes-review-and-updates-of-genetic-basis-manifestations-and-therapeutic-options
#16
REVIEW
Ayman W El-Hattab, Fernando Scaglia
Mitochondrial DNA (mtDNA) depletion syndromes (MDS) are a genetically and clinically heterogeneous group of autosomal recessive disorders that are characterized by a severe reduction in mtDNA content leading to impaired energy production in affected tissues and organs. MDS are due to defects in mtDNA maintenance caused by mutations in nuclear genes that function in either mitochondrial nucleotide synthesis (TK2, SUCLA2, SUCLG1, RRM2B, DGUOK, and TYMP) or mtDNA replication (POLG and C10orf2). MDS are phenotypically heterogeneous and usually classified as myopathic, encephalomyopathic, hepatocerebral or neurogastrointestinal...
April 2013: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/23050596/extracting-time-dependent-obese-diabetic-specific-networks-in-hepatic-proteome-analysis
#17
Mukul K Midha, Kamiya Tikoo, Neeraj Sinha, Simarjeet Kaur, Hirdya N Verma, Kanury V S Rao, Samrat Chatterjee, Venkatasamy Manivel
Molecular mechanism governing biological processes leading to dietary obesity and diabetes are largely unknown. Here we study the liver proteome differentially expressed in a long-term high-fat and high-sucrose diet (HFHSD)-induced obesity and diabetes mouse model. Changes in mouse liver proteins were identified using iTRAQ, offline 2D LC (SCX and RP) and MALDI-TOF/TOF MS. A total of 1639 proteins was quantified during 3-15 weeks of disease progression and a pronounced proteome change was captured by incorporating the statistical analysis and network analysis...
December 7, 2012: Journal of Proteome Research
https://www.readbyqxmd.com/read/22980518/mitochondrial-dna-depletion-syndrome-new-descriptions-and-the-use-of-citrate-synthase-as-a-helpful-tool-to-better-characterise-the-patients
#18
Aleix Navarro-Sastre, Frederic Tort, Judit Garcia-Villoria, Mónica Ruiz Pons, Andrés Nascimento, Jaume Colomer, Jaume Campistol, Maria Eugenia Yoldi, Ester López-Gallardo, Julio Montoya, Maria Unceta, Maria Jesús Martinez, Paz Briones, Antonia Ribes
Mitochondrial DNA depletion syndrome (MDS) is a clinically heterogeneous group of mitochondrial disorders characterised by a quantitative reduction of the mitochondrial DNA copy number. Three main clinical forms of MDS: myopathic, encephalomyopathic and hepatocerebral have been defined, although patients may present with other MDS associated clinical symptoms and signs that cover a wide spectrum of onset age and disease. We studied 52 paediatric individuals suspected to have MDS. These patients have been divided into three different groups, and the appropriate MDS genes have been screened according to their clinical and biochemical phenotypes...
November 2012: Molecular Genetics and Metabolism
https://www.readbyqxmd.com/read/22231385/neonatal-onset-of-mitochondrial-disorders-in-129-patients-clinical-and-laboratory-characteristics-and-a-new-approach-to-diagnosis
#19
Tomas Honzik, Marketa Tesarova, Martin Magner, Johannes Mayr, Pavel Jesina, Katerina Vesela, Laszlo Wenchich, Karol Szentivanyi, Hana Hansikova, Wolfgang Sperl, Jiri Zeman
INTRODUCTION: Mitochondrial disorders (MD) may manifest in neonates, but early diagnosis is difficult. In this study, clinical and laboratory data were analyzed in 129 patients with neonatal onset of MD to identify any association between specific mitochondrial diseases and their symptoms with the aim of optimizing diagnosis. MATERIALS AND METHODS: Retrospective clinical and laboratory data were evaluated in 461 patients (331 families) with confirmed MD. RESULTS: The neonatal onset of MD was reported in 28% of the patients...
September 2012: Journal of Inherited Metabolic Disease
https://www.readbyqxmd.com/read/22215558/measurement-of-mitochondrial-dna-copy-number
#20
Victor Venegas, Michelle C Halberg
Mitochondrial disorders are complex and heterogeneous diseases that may be caused by molecular defects in either the nuclear or mitochondrial genome. The biosynthesis and maintenance of the integrity of the mitochondrial genome is solely dependent on a number of nuclear proteins. Defects in these nuclear genes can lead to mitochondrial DNA (mtDNA) depletion (Spinazzola et al. Biosci Rep 27:39-51, 2007). The mitochondrial DNA (mtDNA) depletion syndromes (MDDSs) are autosomal recessive disorders characterized by a significant reduction in mtDNA content...
2012: Methods in Molecular Biology
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