1
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Naseri A, Zhi D, Zhang S. Discovery of runs-of-homozygosity diplotype clusters and their associations with diseases in UK Biobank. eLife 2024; 13:e81698. [PMID: 38905121 PMCID: PMC11249732 DOI: 10.7554/elife.81698] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 06/20/2024] [Indexed: 06/23/2024] Open
Abstract
Runs-of-homozygosity (ROH) segments, contiguous homozygous regions in a genome were traditionally linked to families and inbred populations. However, a growing literature suggests that ROHs are ubiquitous in outbred populations. Still, most existing genetic studies of ROH in populations are limited to aggregated ROH content across the genome, which does not offer the resolution for mapping causal loci. This limitation is mainly due to a lack of methods for the efficient identification of shared ROH diplotypes. Here, we present a new method, ROH-DICE (runs-of-homozygous diplotype cluster enumerator), to find large ROH diplotype clusters, sufficiently long ROHs shared by a sufficient number of individuals, in large cohorts. ROH-DICE identified over 1 million ROH diplotypes that span over 100 single nucleotide polymorphisms (SNPs) and are shared by more than 100 UK Biobank participants. Moreover, we found significant associations of clustered ROH diplotypes across the genome with various self-reported diseases, with the strongest associations found between the extended human leukocyte antigen (HLA) region and autoimmune disorders. We found an association between a diplotype covering the homeostatic iron regulator (HFE) gene and hemochromatosis, even though the well-known causal SNP was not directly genotyped or imputed. Using a genome-wide scan, we identified a putative association between carriers of an ROH diplotype in chromosome 4 and an increase in mortality among COVID-19 patients (p-value = 1.82 × 10-11). In summary, our ROH-DICE method, by calling out large ROH diplotypes in a large outbred population, enables further population genetics into the demographic history of large populations. More importantly, our method enables a new genome-wide mapping approach for finding disease-causing loci with multi-marker recessive effects at a population scale.
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Affiliation(s)
- Ardalan Naseri
- Department of Computer Science, University of Central FloridaOrlandoUnited States
| | - Degui Zhi
- Center for Precision Health, School of Biomedical Informatics, The University of Texas Health Science Center at HoustonHoustonUnited States
| | - Shaojie Zhang
- Department of Computer Science, University of Central FloridaOrlandoUnited States
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2
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Graham S, Peterson DC, James C. Alcohol-Induced Sudden Cardiac Death in a Teenager With PPA2 Gene Mutations. Am J Forensic Med Pathol 2023; 44:332-335. [PMID: 37249496 DOI: 10.1097/paf.0000000000000841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
ABSTRACT The PPA2 gene encodes a mitochondrial pyrophosphatase protein. Mutations in the gene are inherited in an autosomal recessive fashion and, when mutated, function to induce mitochondrial ATP production failure resulting in increased stress on the heart and sudden cardiac death, especially when combined with alcohol. Herein, we describe a case of a 19-year-old female patient with a history of "alcohol intolerance" who was found unexpectedly deceased after consuming a minimal amount of alcohol. Histological examination of her heart revealed widespread fibrosis of the left ventricle and the interventricular septum. Other findings include hypertrophied myocytes, including some with pleomorphic nuclei. Genetic studies were performed on postmortem blood, revealing heterozygous PPA2 gene mutations, the pathogenic variant c.683C>T (p.Pro228Leu), and the other variant c.814C>T (p.His272Tyr), a novel variant of undetermined significance. We propose that the variant of undetermined significance is likely a pathogenic mutation due to the decedent's phenotype.
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Affiliation(s)
- Sydney Graham
- From the Arkansas College of Osteopathic Medicine, Fort Smith, AR
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3
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Zhao A, Shen J, Ding Y, Sheng M, Zuo M, Lv H, Wang J, Shen Y, Wang H, Sun L. Long-read sequencing identified a novel nonsense and a de novo missense of PPA2 in trans in a Chinese patient with autosomal recessive infantile sudden cardiac failure. Clin Chim Acta 2021; 519:163-171. [PMID: 33826954 DOI: 10.1016/j.cca.2021.03.029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2021] [Revised: 03/30/2021] [Accepted: 03/31/2021] [Indexed: 10/21/2022]
Abstract
BACKGROUND AND AIMS Biallelic missense variants in PPA2 gene cause infantile sudden cardiac failure (SCFI; OMIM #617222) characterized by sudden cardiac failure, sudden cardiac death in infants. Here, we present an unusual survivor with one inherited plus one de novo variant in PPA2. Since next-generation sequencing (NGS) fails to resolve variant phasing, which require long-read sequencing to clarify the diagnosis. MATERIALS AND METHODS Whole exome and Sanger sequencing were initially performed to identify the causative variants. PCR-based short tandem repeats (STRs) analysis and long-read single molecule real-time (SMRT) sequencing were further implemented for paternity testing and variant phasing. Pathogenicity evaluation of the biallelic variants in PPA2 was conducted according to the American College of Medical Genetics and Genomics (ACMG) and the Association for Molecular Pathology (AMP) guidelines based on VarSome. RESULTS Whole exome and Sanger sequencing revealed two variants in PPA2, with one novel nonsense variant (c.524C > G; p.Ser175*) inherited from the mother and one de novo missense variant (c.379C > T; p.Arg127Cys). PCR-based STRs analysis verified the paternity. And long-read SMRT sequencing phased the two variants in trans and identified the paternal origin of the de novo variant. The genetic diagnosis clarified the genetic etiology of the proband and assisted in patient management and counseling. CONCLUSION We identified a rare combination of one inherited plus one de novo variant of PPA2 in a patient with autosomal recessive SCFI, which expanded the mutation spectrum of PPA2 and demonstrated the power of target long-read sequencing to make up the diagnostic gap of prevailing NGS.
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Affiliation(s)
- Arman Zhao
- Department of Clinical Laboratory, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Jie Shen
- Department of Cardiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Yueyue Ding
- Department of Cardiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Mao Sheng
- Department of Radiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Mengying Zuo
- Department of Cardiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Haitao Lv
- Department of Cardiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Jian Wang
- Department of Pediatric Surgery, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
| | - Yiping Shen
- Department of Genetics and Metabolism, Maternal and Child Health Hospital of Guangxi Zhuang Autonomous Region, Nanning 530003, Guangxi, China; Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China; Division of Genetics and Genomics, Boston Children's Hospital, Boston, MA, United States; Department of Neurology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, United States.
| | - Hongying Wang
- Department of Clinical Laboratory, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China; Department of Clinical Laboratory, Children's Hospital of Wujiang District, Suzhou, 169 Park Road, Wujiang District, Suzhou 215234, Jiangsu, China.
| | - Ling Sun
- Department of Cardiology, Children's Hospital of Soochow University, 92 Zhongnan Street, Suzhou Industrial Park, Suzhou 215025, Jiangsu, China.
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4
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Lei Z, Zhou J, Liang M, Xiao Y, Liu Z. Aggregation-Induced Emission of Au/Ag Alloy Nanoclusters for Fluorescence Detection of Inorganic Pyrophosphate and Pyrophosphatase Activity. Front Bioeng Biotechnol 2021; 8:628181. [PMID: 33520975 PMCID: PMC7844307 DOI: 10.3389/fbioe.2020.628181] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 12/15/2020] [Indexed: 12/18/2022] Open
Abstract
The development of sensitive and accurate detection of inorganic pyrophosphate (PPi) and pyrophosphatase activity (PPase) is important as they play vital roles in biological systems. However, it is still not satisfactory for most of the analytical methods for PPi and PPase because of their Cu2+-dependence and poor accuracy. Although the metal ion triggered aggregation-induced emission (AIE) of metal nanoclusters (NCs) offers a new approach to design a Cu2+-free strategy for the accurate determination of PPi and PPase recently, current methods are all focused on utilizing pure metal NCs. Alloy NCs incorporating the advantages of diverse metal usually can achieve improved behaviors in the application, such as enhanced sensitivity and stability. In this work, glutathione stabilized alloy Au/Ag NCs were synthesized via a simple method and used for the fluorescence detection of PPi and PPase based on a Zn2+-regulated AIE strategy. The controlled release of Zn2+ by PPi and PPase could regulate the AIE of Au/Ag NCs and be employed to response PPi concentration and PPase activity. This method processes simple procedure, high sensitivity and stability, and low toxicity. In addition, we also studied the AIE behaviors of this Au/Ag NCs and offer some fundamental understanding of the AIE properties of water-soluble alloy NCs. This study not only provides a straightforward and new approach for PPi and PPase determination but a basis for further study on the AIE properties of alloy NCs and their application.
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Affiliation(s)
- Zhongli Lei
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China
| | - Jie Zhou
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China
| | - Miao Liang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China
| | - Yan Xiao
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China
| | - Zhihong Liu
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules & College of Chemistry and Chemical Engineering, Hubei University, Wuhan, China
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5
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Naseri A, Zhi D, Zhang S. Discovery of runs-of-homozygosity diplotype clusters and their associations with diseases in UK Biobank. MEDRXIV : THE PREPRINT SERVER FOR HEALTH SCIENCES 2020:2020.10.26.20220004. [PMID: 33140058 PMCID: PMC7605569 DOI: 10.1101/2020.10.26.20220004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Runs of homozygosity (ROH) segments, contiguous homozygous regions in a genome were traditionally linked to families and inbred populations. However, a growing literature suggests that ROHs are ubiquitous in outbred populations. Still, most existing genetic studies of ROH in populations are limited to aggregated ROH content across the genome, which does not offer the resolution for mapping causal loci. This limitation is mainly due to a lack of methods for efficient identification of shared ROH diplotypes. Here, we present a new method, ROH-DICE, to find large ROH diplotype clusters, sufficiently long ROHs shared by a sufficient number of individuals, in large cohorts. ROH-DICE identified over 1 million ROH diplotypes that span over 100 SNPs and shared by more than 100 UK Biobank participants. Moreover, we found significant associations of clustered ROH diplotypes across the genome with various self-reported diseases, with the strongest associations found between the extended HLA region and autoimmune disorders. We found an association between a diplotype covering the HFE gene and haemochromatosis, even though the well-known causal SNP was not directly genotyped nor imputed. Using genome-wide scan, we identified a putative association between carriers of an ROH diplotype in chromosome 4 and an increase of mortality among COVID-19 patients. In summary, our ROH-DICE method, by calling out large ROH diplotypes in a large outbred population, enables further population genetics into the demographic history of large populations. More importantly, our method enables a new genome-wide mapping approach for finding disease-causing loci with multi-marker recessive effects at population scale.
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Affiliation(s)
- Ardalan Naseri
- Department of Computer Science, University of Central Florida, Orlando, Florida 32816, USA
| | - Degui Zhi
- Center for Precision Health, School of Biomedical Informatics, University of Texas Health Science Center at Houston, Houston, Texas 77030, USA
| | - Shaojie Zhang
- Department of Computer Science, University of Central Florida, Orlando, Florida 32816, USA
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6
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Valueva A, Romanov RS, Vorobyeva NN, Kurilova SA, Rodina EV. Synthesis of Inorganic Pyrophosphatase-Nanodiamond Conjugates Resistant to Calcium and Fluoride. ACS OMEGA 2020; 5:6641-6650. [PMID: 32258899 PMCID: PMC7114608 DOI: 10.1021/acsomega.9b04428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Accepted: 03/04/2020] [Indexed: 05/15/2023]
Abstract
Pyrophosphate arthropathy is the mineralization defect in humans caused by the deposition of microcrystals of calcium pyrophosphate dihydrate in joint tissues. As a potential therapeutic strategy for the treatment of pyrophosphate arthropathy, delivery of exogenous pyrophosphate-hydrolyzing enzymes, inorganic pyrophosphatases (PPases), to the synovial fluid has been suggested. Previously, we synthesized the conjugates of Escherichia coli PPase (Ec-PPase) with detonation synthesis nanodiamonds (NDs) as a delivery platform, obtaining the hybrid biomaterial retaining high pyrophosphate-hydrolyzing activity in vitro. However, most known PPases including Ec-PPase in the soluble form are strongly inhibited by Ca2+ ions. Because synovial fluid contains up to millimolar concentrations of soluble calcium, this inhibition might limit the in vivo application of Ec-PPase-based material in joint tissues. In this work, we proposed other bacterial PPases from Mycobacterium tuberculosis (Mt-PPase), which are resistant to the inhibition by Ca2+ ions, as an active PPi-hydrolyzing agent. We synthesized conjugates of Mt-PPase with NDs and tested their activity under various conditions. Unexpectedly, conjugates of both Ec-PPase and Mt-PPase with aminated NDs retained significant hydrolytic activity in the presence of well-known mechanism-based PPase inhibitors, fluoride or calcium. The incomplete inhibition of PPases by fluoride or calcium was found for the first time.
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Affiliation(s)
- Anastasiya
V. Valueva
- Pharmaceutical
Department, Pavlov Ryazan State Medical
University, 9 Vysokovol’tnaya
Street, Ryazan 390026, Russia
| | - Roman S. Romanov
- Department
of Fundamental Medicine, Lomonosov Moscow
State University, 31, Build. 5, Lomonosovsky Prospect, Moscow 119991, Russia
| | - Nataliya N. Vorobyeva
- Chemistry
Department, Lomonosov Moscow State University, 1, Build. 3, Leninskie Gory, Moscow 119992, Russia
| | - Svetlana A. Kurilova
- A.N.
Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 1, Build. 40, Leninskie Gory, Moscow 119992, Russia
| | - Elena V. Rodina
- Chemistry
Department, Lomonosov Moscow State University, 1, Build. 3, Leninskie Gory, Moscow 119992, Russia
- E-mail:
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7
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Phoon CKL, Halvorsen M, Goldstein DB, Rabin R, Cecchin F, Crandall L, Devinsky O. Sudden unexpected death in asymptomatic infants due to PPA2 variants. Mol Genet Genomic Med 2019; 8:e1008. [PMID: 31705601 PMCID: PMC6978244 DOI: 10.1002/mgg3.1008] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2019] [Revised: 09/04/2019] [Accepted: 09/05/2019] [Indexed: 01/31/2023] Open
Abstract
Background Sudden death in children is a tragic event that often remains unexplained after comprehensive investigation. We report two asymptomatic siblings who died unexpectedly at approximately 1 year of age found to have biallelic (compound heterozygous) variants in PPA2. Methods The index case, parents, and sister were enrolled in the Sudden Unexplained Death in Childhood Registry and Research Collaborative, which included next‐generation genetic screening. Prior published cases of PPA2 variants, along with the known biology of PPA2, were also summarized. Results Whole exome sequencing in both siblings revealed biallelic rare missense variants in PPA2: c.182C > T (p.Ser61Phe) and c.380G > T (p.Arg127Leu). PPA2 encodes a mitochondrially located inorganic pyrophosphatase implicated in progressive and lethal cardiomyopathies. As a regulator and supplier of inorganic phosphate, PPA2 is central to phosphate metabolism. Biological roles include the following: mtDNA maintenance; oxidative phosphorylation and generation of ATP; reactive oxygen species homeostasis; mitochondrial membrane potential regulation; and possibly, retrograde signaling between mitochondria and nucleus. Conclusions Two healthy and asymptomatic sisters died unexpectedly at ages 12 and 10 months, and were diagnosed by molecular autopsy to carry biallelic variants in PPA2. Our cases add additional details to those reported thus far, and broaden the spectrum of clinical and molecular features of PPA2 variants.
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Affiliation(s)
- Colin K L Phoon
- Division of Pediatric Cardiology, New York University School of Medicine, Hassenfeld Children's Hospital at NYU Langone, New York, NY, USA.,Department of Pediatrics, New York University School of Medicine, Hassenfeld Children's Hospital at NYU Langone, New York, NY, USA
| | - Matthew Halvorsen
- Department of Genetics, University of North Carolina, Chapel Hill, NC, USA
| | - David B Goldstein
- Institute for Genomic Medicine, Columbia University Medical Center, New York, NY, USA
| | - Rachel Rabin
- Department of Pediatrics, New York University School of Medicine, Hassenfeld Children's Hospital at NYU Langone, New York, NY, USA
| | - Frank Cecchin
- Division of Pediatric Cardiology, New York University School of Medicine, Hassenfeld Children's Hospital at NYU Langone, New York, NY, USA.,Department of Pediatrics, New York University School of Medicine, Hassenfeld Children's Hospital at NYU Langone, New York, NY, USA
| | - Laura Crandall
- Department of Neurology, New York University School of Medicine, New York, NY, USA
| | - Orrin Devinsky
- Department of Neurology, New York University School of Medicine, New York, NY, USA
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8
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Li L, Aruna, Luo D, Jin A. Clinical significance and functional validation of inorganic pyrophosphatase in diffuse large B cell lymphoma in humans. Cytotechnology 2017; 70:641-649. [PMID: 29234945 DOI: 10.1007/s10616-017-0165-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2017] [Accepted: 11/01/2017] [Indexed: 01/24/2023] Open
Abstract
Diffuse large B-cell lymphoma (DLBCL), the most common type of non-Hodgkin's lymphoma, displays marked heterogeneity. Although it is usually curable, 30-40% of patients die within 1-2 years due to refractory treatment or cancer relapse. In different types of cancer in humans, inorganic pyrophosphatase (PPA1) is deregulated, thereby contributing to tumorigenesis by supplying the tumor with an enormous energy source. However, the role of PPA1 in DLBCL is still unclear. Here, we analized PPA1 in 65 patients with DLBCL and 20 patients with reactive hyperplasia of the lymph nodes (control). The PPA1 level was significantly higher in patients with DLBCL than in control subjects (p < 0.05), and it is closely associated with B symptoms (i.e., fever, night sweats, and weight loss) and the IPI score (p < 0.05). Furthermore, PPA1 mRNA and protein levels were higher in most DLBCL cell lines than in the control HMy2.CIR cell line. Lastly, we investigated the effects of PPA1 knockdown on the proliferation and survival of the DLBCL cell line. We found that p53 and p21 expression decreased in PPA1-silenced DLBCL cells. In addition, cell proliferation decreased and cell apoptosis increased. In conclusion, PPA1 is a novel molecule that may be useful in the development and prognosis of DLBCL in the future.
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Affiliation(s)
- Limei Li
- The First Affiliated Hospital of Chongqing Medical University, 1Youyi Road, Chongqing, 400016, China. .,Inner Mongolia People's Hospital, Hohhot, 010020, China.
| | - Aruna
- The First Affiliated Hospital of Chongqing Medical University, 1Youyi Road, Chongqing, 400016, China.,Inner Mongolia People's Hospital, Hohhot, 010020, China
| | - Dehong Luo
- The First People's Hospital of Zunyi, Zunyi, 563002, China
| | - Arong Jin
- Inner Mongolia People's Hospital, Hohhot, 010020, China
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9
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PPA1 regulates tumor malignant potential and clinical outcome of colon adenocarcinoma through JNK pathways. Oncotarget 2017; 8:58611-58624. [PMID: 28938583 PMCID: PMC5601679 DOI: 10.18632/oncotarget.17381] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 03/27/2017] [Indexed: 11/25/2022] Open
Abstract
Colorectal cancer (CRC) represents one of the most prevalent malignancies and the third leading cause of cancer death worldwide. Inorganic pyrophosphatase (PPA1) is an enzyme that catalyzes the hydrolysis of pyrophosphate to inorganic phosphate, therefore participates in the energy metabolism. Proteomic studies have demonstrated the up-regulated expression of PPA1 in various tumors, however, its expression pattern in CRC hasn't been reported. In the current study, we used RT-qCR, Western Blot and immunohistochemical (IHC) staining to explore the expression of PPA1 in 113 paired colon cancer tissues and adjacent normal tissues, which revealed that PPA1 was correlated with lymph node metastasis. The prognostic value of PPA1 was confirmed by Kaplan-Meier survival analysis and Cox regression analysis. We further purified PPA1 and obtained the phosphor-JNK1 protein and performed enzymatic studies, which identified that PPA1 can directly dephosphorylate pJNK1, while showed no catalytic activity towards pERK or p-p38 proteins. Moreover, overexpression of PPA1 enhanced cell viability through JNK-p53 signaling pathways, and it may also prevent cell apoptosis by inhibiting Bcl-2 and Caspase-3 cleavage. To our knowledge, this is the first study demonstrated the expression and clinical significance of PPA1 in colon cancer, which also provided evidence that figuring out PPA1 specific inhibitors can be invaluable in the future chemotherapy development towards colon cancer.
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10
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Jiang TT, Wei LL, Shi LY, Chen ZL, Wang C, Liu CM, Li ZJ, Li JC. Microarray expression profile analysis of mRNAs and long non-coding RNAs in pulmonary tuberculosis with different traditional Chinese medicine syndromes. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2016; 16:472. [PMID: 27855662 PMCID: PMC5114807 DOI: 10.1186/s12906-016-1436-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Accepted: 10/27/2016] [Indexed: 02/04/2023]
Abstract
Background Combination chemotherapy with Western anti-tuberculosis (TB) drugs is the mainstay of TB treatment. Chinese herbal medicines with either heat clearing and detoxifying effects or nourishing Yin and reducing fire effects have been used to treat TB based on the Traditional Chinese Medicine (TCM) syndromes of TB patients. This study analyzed the expression profiles of long non-coding RNAs (lncRNAs) and mRNAs in TB patients with different TCM syndromes. Methods TB patients were classified as pulmonary Yin deficiency (PYD) syndrome, hyperactivity of fire due to Yin deficiency (HFYD) syndrome, and deficiency of Qi and Yin (DQY) syndrome. Total RNA from 44 TB patients and healthy controls was extracted and hybridized with a human lncRNA microarray containing 30586 lncRNAs and 26109 mRNAs probes. Bioinformatics analyses, including gene ontology (GO) and pathways, were performed. Related clinical data were also analyzed. Results Differentially expressed mRNAs and lncRNAs were identified (fold change >2, and P < 0.05) in PYD (634 mRNAs and 566 lncRNAs), HFYD (47 mRNAs and 55 lncRNAs), and DQY (63 mRNAs and 60 lncRNAs) patients. The most enriched pathways were the hippo signaling pathway (P = 0.000164) and the protein digestion and absorption pathway (P = 5.89017E-05). Clinical analyses revealed that the lipid indexes of TB patients were abnormal and that the triglyceride concentration was significantly higher in DQY patients (P = 0.0252). Our study is the first to acquire the microarray expression profiles of lncRNAs and mRNAs and analyze pathway enrichment in PYD, HFYD, and DQY patients with TB. Conclusions Our analyses of the expression profiles of lncRNAs and mRNAs may represent a novel method to explore the biological essence of TCM syndromes of TB. Electronic supplementary material The online version of this article (doi:10.1186/s12906-016-1436-y) contains supplementary material, which is available to authorized users.
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Biallelic PPA2 Mutations Cause Sudden Unexpected Cardiac Arrest in Infancy. Am J Hum Genet 2016; 99:666-673. [PMID: 27523598 DOI: 10.1016/j.ajhg.2016.06.021] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Accepted: 06/22/2016] [Indexed: 11/21/2022] Open
Abstract
Sudden unexpected death in infancy occurs in apparently healthy infants and remains largely unexplained despite thorough investigation. The vast majority of cases are sporadic. Here we report seven individuals from three families affected by sudden and unexpected cardiac arrest between 4 and 20 months of age. Whole-exome sequencing revealed compound heterozygous missense mutations in PPA2 in affected infants of each family. PPA2 encodes the mitochondrial pyrophosphatase, which hydrolyzes inorganic pyrophosphate into two phosphates. This is an essential activity for many biosynthetic reactions and for energy metabolism of the cell. We show that deletion of the orthologous gene in yeast (ppa2Δ) compromises cell viability due to the loss of mitochondria. Expression of wild-type human PPA2, but not PPA2 containing the mutations identified in affected individuals, preserves mitochondrial function in ppa2Δ yeast. Using a regulatable (doxycycline-repressible) gene expression system, we found that the pathogenic PPA2 mutations rapidly inactivate the mitochondrial energy transducing system and prevent the maintenance of a sufficient electrical potential across the inner membrane, which explains the subsequent disappearance of mitochondria from the mutant yeast cells. Altogether these data demonstrate that PPA2 is an essential gene in yeast and that biallelic mutations in PPA2 cause a mitochondrial disease leading to sudden cardiac arrest in infants.
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12
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Kennedy H, Haack T, Hartill V, Mataković L, Baumgartner E, Potter H, Mackay R, Alston C, O’Sullivan S, McFarland R, Connolly G, Gannon C, King R, Mead S, Crozier I, Chan W, Florkowski C, Sage M, Höfken T, Alhaddad B, Kremer L, Kopajtich R, Feichtinger R, Sperl W, Rodenburg R, Minet J, Dobbie A, Strom T, Meitinger T, George P, Johnson C, Taylor R, Prokisch H, Doudney K, Mayr J. Sudden Cardiac Death Due to Deficiency of the Mitochondrial Inorganic Pyrophosphatase PPA2. Am J Hum Genet 2016; 99:674-682. [PMID: 27523597 PMCID: PMC5011043 DOI: 10.1016/j.ajhg.2016.06.027] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 06/27/2016] [Indexed: 11/28/2022] Open
Abstract
We have used whole-exome sequencing in ten individuals from four unrelated pedigrees to identify biallelic missense mutations in the nuclear-encoded mitochondrial inorganic pyrophosphatase (PPA2) that are associated with mitochondrial disease. These individuals show a range of severity, indicating that PPA2 mutations may cause a spectrum of mitochondrial disease phenotypes. Severe symptoms include seizures, lactic acidosis, cardiac arrhythmia, and death within days of birth. In the index family, presentation was milder and manifested as cardiac fibrosis and an exquisite sensitivity to alcohol, leading to sudden arrhythmic cardiac death in the second decade of life. Comparison of normal and mutant PPA2-containing mitochondria from fibroblasts showed that the activity of inorganic pyrophosphatase was significantly reduced in affected individuals. Recombinant PPA2 enzymes modeling hypomorphic missense mutations had decreased activity that correlated with disease severity. These findings confirm the pathogenicity of PPA2 mutations and suggest that PPA2 is a cardiomyopathy-associated protein, which has a greater physiological importance in mitochondrial function than previously recognized.
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Tezuka Y, Herai N, Inomata Y, Kagami K, Yamauchi J, Nishigori H, Sanbe A. Upregulation of inorganic pyrophosphatase 1 as a JNK phosphatase in hypothyroid embryonic chick cerebellum. Life Sci 2015; 128:94-100. [PMID: 25748422 DOI: 10.1016/j.lfs.2015.02.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2014] [Revised: 02/02/2015] [Accepted: 02/20/2015] [Indexed: 10/23/2022]
Abstract
AIM Thyroid hormones play important roles in vertebrate neuronal development and differentiation. In our previous study, we showed that fetal thyroid dysfunction led to impaired social behaviors of hatchlings on post-hatch day 3, as well as to impaired learning and memory determined by the imprinting preference. However, little is known about the mechanisms underlying the direct adverse effects of fetal thyroid dysfunction on neuronal development. MATERIALS AND METHODS We used a chick embryo as a fetal model to investigate the effects of prenatal exposure to antithyroid drugs on neuronal development in the chick cerebellum. Methimazole (MMI) at a dose of 20μmol/egg was administered to eggs on day 14, while the control was given only a vehicle. In order to address the underlying mechanisms of the impaired behavior, proteomic approaches were employed in the chick cerebellum two days after MMI treatment. KEY FINDINGS In this experiment, we found that inorganic pyrophosphatase 1 (PPA1) was upregulated in the chick cerebellum treated with MMI, and we confirmed this upregulation of PPA1 by Western blot analysis as well as by RT-PCR analysis. Concomitant with the upregulation of PPA1, a marked reduction in JNK activity, as well as of phospho-JNK level, was detected in the MMI-treated chick cerebellum. SIGNIFICANCE Since PPA1 can dephosphorylate JNK, these results suggest that the upregulation of PPA1 during neuronal development in the hypothyroid chick cerebellum may lead to impaired social behaviors as well as to impaired learning and memory via JNK dephosphorylation and inactivation in the chick cerebellum.
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Affiliation(s)
- Yu Tezuka
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Natsumi Herai
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Yui Inomata
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Keisuke Kagami
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Tokyo 157-8535, Japan
| | - Hideo Nishigori
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan
| | - Atsushi Sanbe
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate 028-3694, Japan.
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Alterations in energy metabolism, neuroprotection and visual signal transduction in the retina of Parkinsonian, MPTP-treated monkeys. PLoS One 2013; 8:e74439. [PMID: 24040246 PMCID: PMC3764107 DOI: 10.1371/journal.pone.0074439] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Accepted: 08/01/2013] [Indexed: 11/27/2022] Open
Abstract
Parkinson disease is mainly characterized by the degeneration of dopaminergic neurons in the central nervous system, including the retina. Different interrelated molecular mechanisms underlying Parkinson disease-associated neuronal death have been put forward in the brain, including oxidative stress and mitochondrial dysfunction. Systemic injection of the proneurotoxin 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) to monkeys elicits the appearance of a parkinsonian syndrome, including morphological and functional impairments in the retina. However, the intracellular events leading to derangement of dopaminergic and other retinal neurons in MPTP-treated animal models have not been so far investigated. Here we have used a comparative proteomics approach to identify proteins differentially expressed in the retina of MPTP-treated monkeys. Proteins were solubilized from the neural retinas of control and MPTP-treated animals, labelled separately with two different cyanine fluorophores and run pairwise on 2D DIGE gels. Out of >700 protein spots resolved and quantified, 36 were found to exhibit statistically significant differences in their expression levels, of at least ±1.4-fold, in the parkinsonian monkey retina compared with controls. Most of these spots were excised from preparative 2D gels, trypsinized and subjected to MALDI-TOF MS and LC-MS/MS analyses. Data obtained were used for protein sequence database interrogation, and 15 different proteins were successfully identified, of which 13 were underexpressed and 2 overexpressed. These proteins were involved in key cellular functional pathways such as glycolysis and mitochondrial electron transport, neuronal protection against stress and survival, and phototransduction processes. These functional categories underscore that alterations in energy metabolism, neuroprotective mechanisms and signal transduction are involved in MPTP-induced neuronal degeneration in the retina, in similarity to mechanisms thought to underlie neuronal death in the Parkinson’s diseased brain and neurodegenerative diseases of the retina proper.
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Do DN, Strathe AB, Ostersen T, Jensen J, Mark T, Kadarmideen HN. Genome-wide association study reveals genetic architecture of eating behavior in pigs and its implications for humans obesity by comparative mapping. PLoS One 2013; 8:e71509. [PMID: 23977060 PMCID: PMC3747221 DOI: 10.1371/journal.pone.0071509] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Accepted: 07/01/2013] [Indexed: 01/07/2023] Open
Abstract
This study was aimed at identifying genomic regions controlling feeding behavior in Danish Duroc boars and its potential implications for eating behavior in humans. Data regarding individual daily feed intake (DFI), total daily time spent in feeder (TPD), number of daily visits to feeder (NVD), average duration of each visit (TPV), mean feed intake per visit (FPV) and mean feed intake rate (FR) were available for 1130 boars. All boars were genotyped using the Illumina Porcine SNP60 BeadChip. The association analyses were performed using the GenABEL package in the R program. Sixteen SNPs were found to have moderate genome-wide significance (p<5E-05) and 76 SNPs had suggestive (p<5E-04) association with feeding behavior traits. MSI2 gene on chromosome (SSC) 14 was very strongly associated with NVD. Thirty-six SNPs were located in genome regions where QTLs have previously been reported for behavior and/or feed intake traits in pigs. The regions: 64–65 Mb on SSC 1, 124–130 Mb on SSC 8, 63–68 Mb on SSC 11, 32–39 Mb and 59–60 Mb on SSC 12 harbored several signifcant SNPs. Synapse genes (GABRR2, PPP1R9B, SYT1, GABRR1, CADPS2, DLGAP2 and GOPC), dephosphorylation genes (PPM1E, DAPP1, PTPN18, PTPRZ1, PTPN4, MTMR4 and RNGTT) and positive regulation of peptide secretion genes (GHRH, NNAT and TCF7L2) were highly significantly associated with feeding behavior traits. This is the first GWAS to identify genetic variants and biological mechanisms for eating behavior in pigs and these results are important for genetic improvement of pig feed efficiency. We have also conducted pig-human comparative gene mapping to reveal key genomic regions and/or genes on the human genome that may influence eating behavior in human beings and consequently affect the development of obesity and metabolic syndrome. This is the first translational genomics study of its kind to report potential candidate genes for eating behavior in humans.
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Affiliation(s)
- Duy Ngoc Do
- Department of Veterinary Clinical and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
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Genome-wide association study of patient-rated and clinician-rated global impression of severity during antipsychotic treatment. Pharmacogenet Genomics 2013; 23:69-77. [PMID: 23241943 DOI: 10.1097/fpc.0b013e32835ca260] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
OBJECTIVE To examine the unique and congruent findings between multiple raters in a genome-wide association study (GWAS) in the context of understanding individual differences in treatment response during antipsychotic therapy for schizophrenia. MATERIALS AND METHODS We performed GWAS to search for genetic variation affecting treatment response. The analysis sample included 738 patients with schizophrenia, successfully genotyped for ∼492k single nucleotide polymorphisms (SNPs) from the Clinical Antipsychotic Trial of Intervention Effectiveness. Outcomes included both clinician and patient report of illness severity on global impression scales, the clinical global impression severity scale and patient global impression, respectively. Our criterion for genome-wide significance was a prespecified threshold ensuring that, on average, only 10% of the significant findings are false discoveries. RESULTS Thirteen SNPs reached genome-wide significance. The top findings indicated three SNPs in PDE4D, 5q12.1 (P=4.2×10, 1.6×10, 1.8×10), mediating the effects of quetiapine on patient-reported severity and an additional three SNPs in TJP1, 15q13.1 (P=2.25×10, 4.86×10, 4.91×10), mediating the effects of risperidone on patient-reported severity. For clinician-reported severity, two SNPs in PPA2, 4q24 (P=3.68×10, 5.05×10), were found to reach genome-wide significance. CONCLUSION We found evidence of both a novel and a consistent association when examining the results from the patient and clinician ratings, suggesting that different raters may capture unique facets of schizophrenia. Although our findings require replication and functional validation, this study shows the potential of GWAS to discover genes that potentially mediate treatment response of antipsychotic medication.
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Diagnostic yield of array comparative genomic hybridization in adults with autism spectrum disorders. Genet Med 2013; 16:70-7. [PMID: 23765050 DOI: 10.1038/gim.2013.78] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 04/18/2013] [Indexed: 11/08/2022] Open
Abstract
PURPOSE Array comparative genomic hybridization is available for the evaluation of autism spectrum disorders. The diagnostic yield of testing is 5-18% in children with developmental disabilities, including autism spectrum disorders and multiple congenital anomalies. The yield of array comparative genomic hybridization in the adult autism spectrum disorder population is unknown. METHODS We performed a retrospective chart review for 40 consecutive patients referred for genetic evaluation of autism from July 2009 through April 2012. Four pediatric patients were excluded. Medical history and prior testing were reviewed. Clinical genetic evaluation and testing were offered to all patients. RESULTS The study population comprised 36 patients (age range 18-45, mean 25.3 years). An autism spectrum disorder diagnosis was confirmed in 34 of 36 patients by medical record review. One patient had had an abnormal karyotype; none had prior array comparative genomic hybridization testing. Of the 23 patients with autism who underwent array comparative genomic hybridization, 2 of 23 (8.7%) had pathogenic or presumed pathogenic abnormalities and 2 of 23 (8.7%) had likely pathogenic copy-number variants. An additional 5 of 23 (22%) of autism patients had variants of uncertain significance without subclassification. CONCLUSION Including one patient newly diagnosed with fragile X syndrome, our data showed abnormal or likely pathogenic findings in 5 of 24 (21%) adult autism patients. Genetic reevaluation in adult autism patients is warranted.
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Tezuka Y, Okada M, Tada Y, Yamauchi J, Nishigori H, Sanbe A. Regulation of neurite growth by inorganic pyrophosphatase 1 via JNK dephosphorylation. PLoS One 2013; 8:e61649. [PMID: 23626709 PMCID: PMC3633968 DOI: 10.1371/journal.pone.0061649] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Accepted: 03/12/2013] [Indexed: 02/07/2023] Open
Abstract
Neural cell differentiation during development is controlled by multiple signaling pathways, in which protein phosphorylation and dephosphorylation play an important role. In this study, we examined the role of pyrophosphatase1 (PPA1) in neuronal differentiation using the loss and gain of function analysis. Neuronal differentiation induced by external factors was studied using a mouse neuroblastoma cell line (N1E115). The neuronal like differentiation in N1E115 cells was determined by morphological analysis based on neurite growth length. In order to analyze the loss of the PPA1 function in N1E115, si-RNA specifically targeting PPA1 was generated. To study the effect of PPA1 overexpression, an adenoviral gene vector containing the PPA1 gene was utilized to infect N1E115 cells. To address the need for pyrophosphatase activity in PPA1, D117A PPA1, which has inactive pyrophosphatase, was overexpressed in N1E115 cells. We used valproic acid (VPA) as a neuronal differentiator to examine the effect of PPA1 in actively differentiated N1E115 cells. Si-PPA1 treatment reduced the PPA1 protein level and led to enhanced neurite growth in N1E115 cells. In contrast, PPA1 overexpression suppressed neurite growth in N1E115 cells treated with VPA, whereas this effect was abolished in D117A PPA1. PPA1 knockdown enhanced the JNK phosphorylation level, and PPA1 overexpression suppressed it in N1E115 cells. It seems that recombinant PPA1 can dephosphorylate JNK while no alteration of JNK phosphorylation level was seen after treatment with recombinant PPA1 D117A. Enhanced neurite growth by PPA1 knockdown was also observed in rat cortical neurons. Thus, PPA1 may play a role in neuronal differentiation via JNK dephosphorylation.
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Affiliation(s)
- Yu Tezuka
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate, Japan
| | - Mizuki Okada
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate, Japan
| | - Yuka Tada
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate, Japan
| | - Junji Yamauchi
- Department of Pharmacology, National Research Institute for Child Health and Development, Tokyo, Japan
| | - Hideo Nishigori
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate, Japan
| | - Atsushi Sanbe
- Department of Pharmacotherapeutics, School of Pharmacy, Iwate Medical University, Iwate, Japan
- * E-mail:
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Ducloux C, Mougel M, Goldschmidt V, Didierlaurent L, Marquet R, Isel C. A pyrophosphatase activity associated with purified HIV-1 particles. Biochimie 2012; 94:2498-507. [PMID: 22766015 DOI: 10.1016/j.biochi.2012.06.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Accepted: 06/22/2012] [Indexed: 01/17/2023]
Abstract
Treatment of HIV-1 with nucleoside reverse transcription inhibitors leads to the emergence of resistance mutations in the reverse transcriptase (RT) gene. Resistance to 3'-azido-3'-deoxythymidine (AZT) and to a lesser extent to 2'-3'-didehydro-2'-3'-dideoxythymidine is mediated by phosphorolytic excision of the chain terminator. Wild-type RT excises AZT by pyrophosphorolysis, while thymidine-associated resistance mutations in RT (TAMs) favour ATP as the donor substrate. However, in vitro, resistant RT still uses pyrophosphate more efficiently than ATP. We performed in vitro (-) strong-stop DNA synthesis experiments, with wild-type and AZT-resistant HIV-1 RTs, in the presence of physiologically relevant pyrophosphate and/or ATP concentrations and found that in the presence of pyrophosphate, ATP and AZTTP, TAMs do not enhance in vitro (-) strong-stop DNA synthesis. We hypothesized that utilisation of ATP in vivo is driven by intrinsic low pyrophosphate concentrations within the reverse transcription complex, which could be explained by the packaging of a cellular pyrophosphatase. We showed that over-expressed flagged-pyrophosphatase was associated with HIV-1 viral-like particles. In addition, we demonstrated that when HIV-1 particles were purified in order to avoid cellular microvesicle contamination, a pyrophosphatase activity was specifically associated to them. The presence of a pyrophosphatase activity in close proximity to the reverse transcription complex is most likely advantageous to the virus, even in the absence of any drug pressure.
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Affiliation(s)
- Céline Ducloux
- Architecture et Réactivité de l'ARN, Université de Strasbourg, CNRS, IBMC, 15 Rue René Descartes, 67084 Strasbourg, France.
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Kim Y, Nandakumar MP, Marten MR. Proteome map of Aspergillus nidulans during osmoadaptation. Fungal Genet Biol 2007; 44:886-95. [PMID: 17258477 DOI: 10.1016/j.fgb.2006.12.001] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2006] [Revised: 11/29/2006] [Accepted: 12/03/2006] [Indexed: 02/02/2023]
Abstract
The model filamentous fungus Aspergillus nidulans, when grown in a moderate level of osmolyte (+0.6M KCl), was previously found to have a significantly reduced cell wall elasticity (Biotech Prog, 21:292, 2005). In this study, comparative proteomic analysis via two-dimensional gel electrophoresis (2de) and matrix-assisted laser desorption ionization/time-of-flight (MALDI-TOF) mass spectrometry was used to assess molecular level events associated with this phenomenon. Thirty of 90 differentially expressed proteins were identified. Sequence homology and conserved domains were used to assign probable function to twenty-one proteins currently annotated as "hypothetical." In osmoadapted cells, there was an increased expression of glyceraldehyde-3-phosphate dehydrogenase and aldehyde dehydrogenase, as well as a decreased expression of enolase, suggesting an increased glycerol biosynthesis and decreased use of the TCA cycle. There also was an increased expression of heat shock proteins and Shp1-like protein degradation protein, implicating increased protein turnover. Five novel osmoadaptation proteins of unknown functions were also identified.
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Affiliation(s)
- Yonghyun Kim
- Department of Chemical and Biochemical Engineering, University of Maryland Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, MD 21250, USA
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Abstract
PURPOSE OF REVIEW Our understanding of mitochondrial diseases (defined restrictively as defects of the mitochondrial respiratory chain) is expanding rapidly. In this review, I will give the latest information on disorders affecting predominantly or exclusively skeletal muscle. RECENT FINDINGS The most recently described mitochondrial myopathies are due to defects in nuclear DNA, including coenzyme Q10 deficiency and mutations in genes controlling mitochondrial DNA abundance and structure, such as POLG, TK2, and MPV17. Barth syndrome, an X-linked recessive mitochondrial myopathy/cardiopathy, is associated with decreased amount and altered structure of cardiolipin, the main phospholipid of the inner mitochondrial membrane, but a secondary impairment of respiratory chain function is plausible. The role of mutations in protein-coding genes of mitochondrial DNA in causing isolated myopathies has been confirmed. Mutations in tRNA genes of mitochondrial DNA can also cause predominantly myopathic syndromes and--contrary to conventional wisdom--these mutations can be homoplasmic. SUMMARY Defects in the mitochondrial respiratory chain impair energy production and almost invariably involve skeletal muscle, causing exercise intolerance, cramps, recurrent myoglobinuria, or fixed weakness, which often affects extraocular muscles and results in droopy eyelids (ptosis) and progressive external ophthalmoplegia.
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Affiliation(s)
- Salvatore DiMauro
- Department of Neurology, Columbia University Medical Center, New York, NY 10032, USA.
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