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DBT Gene Dihydrolipoamide Branched Chain Transacylase E2
DBT gene dihydrolipoamide branched chain transacylase E2 Normal Function The DBT gene provides instructions for making part of a group of enzymes called the branched-chain alpha-keto acid dehydrogenase (BCKD) enzyme complex. Specifically, the protein produced from the DBT gene forms a critical piece of the enzyme complex called the E2 component. The BCKD enzyme complex is responsible for one step in the normal breakdown of three protein building blocks (amino acids). These amino acids—leucine, isoleucine, and valine—are obtained from the diet. They are present in many kinds of food, particularly protein-rich foods such as milk, meat, and eggs. The BCKD enzyme complex is active in mitochondria, which are specialized structures inside cells that serve as energy-producing centers. The breakdown of leucine, isoleucine, and valine produces molecules that can be used for energy. Health Conditions Related to Genetic Changes Maple syrup urine disease More than 70 mutations in the DBT gene have been identified in people with maple syrup urine disease, most often in individuals with mild variants of the disorder. These variant forms become apparent later in infancy or childhood, and they lead to delayed development and other health problems if not treated. Mutations in the DBT gene include changes in single DNA building blocks (base pairs) and insertions or deletions of a small amount of DNA in the DBT gene. These changes disrupt the normal function of the E2 component, preventing the BCKD enzyme complex from effectively breaking down leucine, isoleucine, and valine. As a result, these amino acids and their byproducts build up in the body. -
Thiamine Dependency and Related Gene Mutations: Recent Aspects
Int J Anal Bio-Sci Vol. 3, No 4 (2015) 〈Review Article〉 Thiamine dependency and related gene mutations: recent aspects Sachiko Kiuchi1, Hiroshi Ihara1, Yoshikazu Nishiguchi2, Nobue Ito3, Hiromitsu Yokota3 and Naotaka Hashizume4 Summary Thiamine dependency is an inherited metabolic disorder from which patients exhibit severe symptoms of deficiency, although they are fed more than the normal requirement of this vitamin. Deficiency symptoms can be treated with pharmacologic doses of thiamine as high as 100 to 1,000 times the Dietary Reference Values. Thiamine dependency is nowadays classified as a disorder caused by genetic mutations affecting thiamine-dependent enzymes or thiamine transporter, which transports thiamine to cells. The former mutation on enzyme is known as a pyruvate dehydrogenase complex deficiency (i.e., congenital lactic acidemia and Leigh syndrome) and a deficiency in branched- chain α-ketoacid dehydrogenase complex (i.e., maple syrup urine disease). The latter are known as mutations in thiamine transporter gene that makes protein transporting thiamine into cells (encoded by SLC19A2 and SLC19A3 genes) and protein transporting thiamine diphosphate into the mitochon- dria (encoded by SLC25A19 gene). Thiamine-responsive megaloblastic anemia (TRMA), an autosomal recessive disease, is caused by loss of functional mutation in the SLC19A2 (ThTr-1). Key words: Vitamin B1 dependency, Thiamine deficiency, Maple syrup urine disease, Megaloblastic anemia, Thiamine transporter 1. Introduction the normal daily requirement from diets, dietary supplements, or intravenous dosage. The deficiency To maintain normal carbohydrate metabolism in symptoms were better treated by taking amounts of the body, we have to ingest thiamine from our diet. thiamine 100-fold greater or more than that of the The daily required amounts are 1.4 mg (4.2 µmol) for daily requirement, but the symptoms would reappear men and 1.1 mg (3.3 µmol) for women for Japanese if the treatment was stopped4. -
Maple Syrup Urine Disease with a Novel DBT Gene Mutation Wei Feng1, Jinfu Jia1, Heyang Guan2 and Qing Tian3*
Feng et al. BMC Pediatrics (2019) 19:494 https://doi.org/10.1186/s12887-019-1880-1 CASE REPORT Open Access Case report: maple syrup urine disease with a novel DBT gene mutation Wei Feng1, Jinfu Jia1, Heyang Guan2 and Qing Tian3* Abstract Background: Maple syrup urine disease (MSUD) is a potentially life-threatening metabolic disorder caused by decreased activity of the branched-chain α-ketoacid dehydrogenase (BCKD) complex. Mutations in four genes (BCKDHA, BCKDHB, DLD and DBT) are associated with MSUD. Here, the presenting symptoms and clinical course of a case of MSUD with a novel DBT gene mutation are described. Case presentation: We describe an infant with MSUD with the DBT gene mutation who had drowsiness and poor appetite as well as abnormal findings upon head magnetic resonance imaging (MRI), plasma amino acid analysis and urine organic acid analysis. Genetic testing revealed that both parents had the heterozygous mutation c.1132C > T (p.378X) in chr1:100672078, and the patient had the homozygous mutations c.1132C > T (p.378X) in chr1:100672078. Once diagnosed with MSUD, the patient’s disease was controlled with a diet of BCAA-free enteral formula and thiamine. Conclusion: The mutation c.1132C > T (p.378X) is a novel DBT gene mutation that is associated with MSUD and always has mild clinical manifestations. After timely BCAA-free nutrition and supplementation with thiamine for the patient, the plasma levels of BCAAs reached a safe level, the abnormal range of the multiple intracranial abnormalities was significantly smaller than before, and the symptoms of drowsiness and poor appetite disappeared. -
Genes Investigated
BabyNEXTTM EXTENDED Investigated genes and associated diseases Gene Disease OMIM OMIM Condition RUSP gene Disease ABCC8 Familial hyperinsulinism 600509 256450 Metabolic disorder - ABCC8-related Inborn error of amino acid metabolism ABCD1 Adrenoleukodystrophy 300371 300100 Miscellaneous RUSP multisystem (C) * diseases ABCD4 Methylmalonic aciduria and 603214 614857 Metabolic disorder - homocystinuria, cblJ type Inborn error of amino acid metabolism ACAD8 Isobutyryl-CoA 604773 611283 Metabolic Disorder - RUSP dehydrogenase deficiency Inborn error of (S) ** organic acid metabolism ACAD9 acyl-CoA dehydrogenase-9 611103 611126 Metabolic Disorder - (ACAD9) deficiency Inborn error of fatty acid metabolism ACADM Acyl-CoA dehydrogenase, 607008 201450 Metabolic Disorder - RUSP medium chain, deficiency of Inborn error of fatty (C) acid metabolism ACADS Acyl-CoA dehydrogenase, 606885 201470 Metabolic Disorder - RUSP short-chain, deficiency of Inborn error of fatty (S) acid metabolism ACADSB 2-methylbutyrylglycinuria 600301 610006 Metabolic Disorder - RUSP Inborn error of (S) organic acid metabolism ACADVL very long-chain acyl-CoA 609575 201475 Metabolic Disorder - RUSP dehydrogenase deficiency Inborn error of fatty (C) acid metabolism ACAT1 Alpha-methylacetoacetic 607809 203750 Metabolic Disorder - RUSP aciduria Inborn error of (C) organic acid metabolism ACSF3 Combined malonic and 614245 614265 Metabolic Disorder - methylmalonic aciduria Inborn error of organic acid metabolism 1 ADA Severe combined 608958 102700 Primary RUSP immunodeficiency due -
Low-Temperature Effects on Docosahexaenoic Acid Biosynthesis
Hu et al. Biotechnol Biofuels (2020) 13:172 https://doi.org/10.1186/s13068-020-01811-y Biotechnology for Biofuels RESEARCH Open Access Low-temperature efects on docosahexaenoic acid biosynthesis in Schizochytrium sp. TIO01 and its proposed underlying mechanism Fan Hu1 , April L. Clevenger2, Peng Zheng3, Qiongye Huang1 and Zhaokai Wang1* Abstract Background: Schizochytrium species are known for their abundant production of docosahexaenoic acid (DHA). Low temperatures can promote the biosynthesis of polyunsaturated fatty acids (PUFAs) in many species. This study investi- gates low-temperature efects on DHA biosynthesis in Schizochytrium sp. TIO01 and its underlying mechanism. Results: The Schizochytrium fatty acid biosynthesis pathway was evaluated based on de novo genome assembly (contig N50 2.86 Mb) and iTRAQ-based protein identifcation. Our fndings revealed that desaturases, involved in DHA synthesis= via the fatty acid synthase (FAS) pathway, were completely absent. The polyketide synthase (PKS) path- way and the FAS pathway are, respectively, responsible for DHA and saturated fatty acid synthesis in Schizochytrium. Analysis of fatty acid composition profles indicates that low temperature has a signifcant impact on the production of DHA in Schizochytrium, increasing the DHA content from 43 to 65% of total fatty acids. However, the expression levels of PKS pathway genes were not signifcantly regulated as the DHA content increased. Further, gene expression analysis showed that pathways related to the production of substrates (acetyl-CoA and NADPH) for fatty acid synthe- sis (the branched-chain amino acid degradation pathway and the pentose phosphate pathway) and genes related to saturated fatty acid biosynthesis (the FAS pathway genes and malic enzyme) were, respectively, upregulated and downregulated. -
CDH12 Cadherin 12, Type 2 N-Cadherin 2 RPL5 Ribosomal
5 6 6 5 . 4 2 1 1 1 2 4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 A A A A A A A A A A A A A A A A A A A A C C C C C C C C C C C C C C C C C C C C R R R R R R R R R R R R R R R R R R R R B , B B B B B B B B B B B B B B B B B B B , 9 , , , , 4 , , 3 0 , , , , , , , , 6 2 , , 5 , 0 8 6 4 , 7 5 7 0 2 8 9 1 3 3 3 1 1 7 5 0 4 1 4 0 7 1 0 2 0 6 7 8 0 2 5 7 8 0 3 8 5 4 9 0 1 0 8 8 3 5 6 7 4 7 9 5 2 1 1 8 2 2 1 7 9 6 2 1 7 1 1 0 4 5 3 5 8 9 1 0 0 4 2 5 0 8 1 4 1 6 9 0 0 6 3 6 9 1 0 9 0 3 8 1 3 5 6 3 6 0 4 2 6 1 0 1 2 1 9 9 7 9 5 7 1 5 8 9 8 8 2 1 9 9 1 1 1 9 6 9 8 9 7 8 4 5 8 8 6 4 8 1 1 2 8 6 2 7 9 8 3 5 4 3 2 1 7 9 5 3 1 3 2 1 2 9 5 1 1 1 1 1 1 5 9 5 3 2 6 3 4 1 3 1 1 4 1 4 1 7 1 3 4 3 2 7 6 4 2 7 2 1 2 1 5 1 6 3 5 6 1 3 6 4 7 1 6 5 1 1 4 1 6 1 7 6 4 7 e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e e l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p p m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m m -
Dietary Amylose:Amylopectin Ratio Influences the Expression of Amino Acid Transporters and Enzyme Activities for Amino Acid Meta
Downloaded from British Journal of Nutrition, page 1 of 11 doi:10.1017/S0007114521002087 https://www.cambridge.org/core © The Author(s), 2021. Published by Cambridge University Press on behalf of The Nutrition Society. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited. Dietary amylose:amylopectin ratio influences the expression of amino acid transporters and enzyme activities for amino acid metabolism in the gastrointestinal tract of goats . IP address: 170.106.202.226 Xiaokang Lv1,2, Chuanshe Zhou1,2*, Tao Ran3, Jinzhen Jiao1, Yong Liu1, Zhiliang Tan1, Shaoxun Tang1, Jinhe Kang1, Jingjing Xie1, Liang Chen1, Ao Ren4, Qixiang Xv1,2 and Zhiwei Kong1 1CAS Key Laboratory of Agro-ecological Processes in Subtropical Region, National Engineering Laboratory for Pollution Control and Waste Utilization in Livestock and Poultry Production, Hunan Provincial Key Laboratory of Animal Nutrition & Physiology , on and Metabolism, Institute of Subtropical Agriculture, the Chinese Academy of Sciences, Changsha 410125, People’s Republic of 28 Sep 2021 at 13:00:40 China 2University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China 3College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, People’s Republic of China 4Department of Animal Science and Technology, University of Hunan Agricultural University, Changsha 410128, People’s Republic of China , subject to the Cambridge Core terms of use, available at (Submitted 12 March 2021 – Final revision received 25 May 2021 – Accepted 8 June 2021) Abstract This study was designed to investigate the effects of dietary starch structure on muscle protein synthesis and gastrointestinal amino acid (AA) transport and metabolism of goats. -
Maple Syrup Urine Disease Mutation Spectrum in a Cohort of 40 Consanguineous Patients and Insilico Analysis of Novel Mutations
Metabolic Brain Disease (2019) 34:1145–1156 https://doi.org/10.1007/s11011-019-00435-y ORIGINAL ARTICLE Maple syrup urine disease mutation spectrum in a cohort of 40 consanguineous patients and insilico analysis of novel mutations Maryam Abiri1 & Hassan Saei1,2 & Maryam Eghbali3 & Razieh Karamzadeh4 & Tina Shirzadeh5,6 & Zohreh Sharifi5,6 & Sirous Zeinali5,7 Received: 28 February 2019 /Accepted: 13 May 2019 /Published online: 22 May 2019 # Springer Science+Business Media, LLC, part of Springer Nature 2019 Abstract Maple syrup urine disease is the primary aminoacidopathy affecting branched-chain amino acid (BCAA) metabolism. The disease is mainly caused by the deficiency of an enzyme named branched-chained α-keto acid dehydrogenase (BCKD), which consist of four subunits (E1α,E1β, E2, and E3), and encoded by BCKDHA, BCKDHB, DBT,andDLD gene respectively. BCKD is the main enzyme in the catabolism pathway of BCAAs. Hight rate of autosomal recessive disorders is expected from consanguineous populations like Iran. In this study, we selected two sets of STR markers linked to the four genes, that mutation in which can result in MSUD disease. The patients who had a homozygous haplotype for selected markers of the genes were sequenced. In current survey, we summarized our recent molecular genetic findings to illustrate the mutation spectrum of MSUD in our country. Ten novel mutations including c.484 A > G, c.834_836dup CAC, c.357del T, and c. (343 + 1_344–1) _ (742 + 1_743–1)del in BCKDHB,c.355–356 ins 7 nt ACAAGGA, and c.703del T in BCKDHA, and c.363delCT/c.1238 T > C, c. -
Supplementary Materials
Supplementary Materials COMPARATIVE ANALYSIS OF THE TRANSCRIPTOME, PROTEOME AND miRNA PROFILE OF KUPFFER CELLS AND MONOCYTES Andrey Elchaninov1,3*, Anastasiya Lokhonina1,3, Maria Nikitina2, Polina Vishnyakova1,3, Andrey Makarov1, Irina Arutyunyan1, Anastasiya Poltavets1, Evgeniya Kananykhina2, Sergey Kovalchuk4, Evgeny Karpulevich5,6, Galina Bolshakova2, Gennady Sukhikh1, Timur Fatkhudinov2,3 1 Laboratory of Regenerative Medicine, National Medical Research Center for Obstetrics, Gynecology and Perinatology Named after Academician V.I. Kulakov of Ministry of Healthcare of Russian Federation, Moscow, Russia 2 Laboratory of Growth and Development, Scientific Research Institute of Human Morphology, Moscow, Russia 3 Histology Department, Medical Institute, Peoples' Friendship University of Russia, Moscow, Russia 4 Laboratory of Bioinformatic methods for Combinatorial Chemistry and Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences, Moscow, Russia 5 Information Systems Department, Ivannikov Institute for System Programming of the Russian Academy of Sciences, Moscow, Russia 6 Genome Engineering Laboratory, Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, Russia Figure S1. Flow cytometry analysis of unsorted blood sample. Representative forward, side scattering and histogram are shown. The proportions of negative cells were determined in relation to the isotype controls. The percentages of positive cells are indicated. The blue curve corresponds to the isotype control. Figure S2. Flow cytometry analysis of unsorted liver stromal cells. Representative forward, side scattering and histogram are shown. The proportions of negative cells were determined in relation to the isotype controls. The percentages of positive cells are indicated. The blue curve corresponds to the isotype control. Figure S3. MiRNAs expression analysis in monocytes and Kupffer cells. Full-length of heatmaps are presented. -
Term Description FDR Matching Proteins in the Network Metabolic Pathways 2.40E-81 AADAT,AASS,ABAT,ACAA2, ACADL, ACADM, ACADS, AC
Term description FDR Matching proteins in the network Metabolic pathways 2.40e-81 AADAT,AASS,ABAT,ACAA2, ACADL, ACADM, ACADS, ACADSB, ACADVL, ACAT1, ACO2, ACOT1, ACOT2, ACOX1, ACSL5, ACSL6, ACSM1, ACSM3, ACSM5, ACSS2, ACSS3, AGMAT, AGXT2, AK4, ALAS1, ALDH1B1, ALDH2, ALDH4A1, ALDH5A1, ALDH6A1, ALDOB, AMACR, AMT, APRT, ARG1, ATP5A1, ATP5B, ATP5C1, ATP5E, ATP5F1, ATP5H, ATP5J, ATP5L, ATP5O, AUH, BCKDHA, BDH1, CHDH, COX4I1, COX7C, CPS1, CS, CYCS, CYP1A2, CYP27A1, DBT, DHRS4, DLAT, DLD, DLST, DMGDH, ECHS1, EHHADH, ENO1, EPHX2, FAHD1, FASN, FDPS, FECH, FH, GBE1, GCDH, GLDC, GLS, GLS2, GLUD1, GOT2, GPAM, GPI, GPT2, H6PD, HADH, HADHA, HADHB, HIBADH, HIBCH, HMGCL, HMGCS2, HSD17B10, HSD17B12, IDH1, IDH2, IDH3A, IDH3G, IVD, MCCC1, MCCC2, MCEE, MDH2, ME1, ME3, MECR, MLYCD, MMAB, MPST, MT-ATP8, MTHFD1L, MUT, NDUFA10, NDUFA12, NDUFA13, NDUFA2, NDUFA5, NDUFA7, NDUFA9, NDUFAB1, NDUFB11, NDUFB3, NDUFS1, NDUFS2, NDUFS3, NDUFS6, NDUFS7, NDUFS8, NDUFV1, NDUFV2, NDUFV3, NNT, OAT, OGDH, OTC, OXSM, PC, PCCA, PCCB, PDHA1, PDHB, PDHX, PRODH2, PYCR2, PYGL, SARDH, SDHA, SDHB, SHMT2, SLC27A5, SUCLA2, SUCLG1, SUCLG2, TST, UGP2, UQCRC2, UQCRFS1, UQCRQ Carbon metabolism 4.12e-43 ACADM, ACADS, ACAT1, ACO2, ACSS2, ALDH6A1, ALDOB, AMT, CAT, CPS1, CS, DLAT, DLD, DLST, ECHS1, EHHADH, ENO1, FH, GLDC, GLUD1, GOT2, GPI, GPT2, H6PD, HADHA, HIBCH, IDH1, IDH2, IDH3A, IDH3G, MCEE, MDH2, ME1, ME2, ME3, MUT, OGDH, PC, PCCA, PCCB, PDHA1, PDHB, SDHA, SDHB, SHMT2, SUCLA2, SUCLG1, SUCLG2 Valine, leucine, and isoleucine degradation 1.44e-33 ABAT, ACAA2, ACADM, ACADS, ACADSB, ACAT1, ACSF3, -
A Novel Whole Gene Deletion of BCKDHB by Alu-Mediated Non-Allelic Recombination in a Chinese Patient with Maple Syrup Urine Disease
fgene-09-00145 April 21, 2018 Time: 11:38 # 1 CASE REPORT published: 24 April 2018 doi: 10.3389/fgene.2018.00145 A Novel Whole Gene Deletion of BCKDHB by Alu-Mediated Non-allelic Recombination in a Chinese Patient With Maple Syrup Urine Disease Gang Liu1†, Dingyuan Ma1†, Ping Hu1, Wen Wang2, Chunyu Luo1, Yan Wang1, Yun Sun1, Jingjing Zhang1, Tao Jiang1* and Zhengfeng Xu1* 1 State Key Laboratory of Reproductive Medicine, Department of Prenatal Diagnosis, The Affiliated Obstetrics and Gynecology Hospital of Nanjing Medical University, Nanjing Maternity and Child Health Care Hospital, Nanjing, China, 2 Reproductive Genetic Center, Affiliated Hospital of Xuzhou Medical University, Xuzhou, China Edited by: Musharraf Jelani, Maple syrup urine disease (MSUD) is an autosomal recessive inherited metabolic King Abdulaziz University, disorder caused by mutations in the BCKDHA, BCKDHB, DBT, and DLD genes. Among Saudi Arabia the wide range of disease-causing mutations in BCKDHB, only one large deletion has Reviewed by: Michael L. Raff, been associated with MSUD. Compound heterozygous mutations in BCKDHB were MultiCare Health System, identified in a Chinese patient with typical MSUD using next-generation sequencing, United States quantitative PCR, and array comparative genomic hybridization. One allele presented Bruna De Felice, Università degli Studi della Campania a missense mutation (c.391G > A), while the other allele had a large deletion; both “Luigi Vanvitelli”, Italy were inherited from the patient’s unaffected parents. The deletion breakpoints were *Correspondence: characterized using long-range PCR and sequencing. A novel 383,556 bp deletion Tao Jiang [email protected] (chr6: g.80811266_81194921del) was determined, which encompassed the entire Zhengfeng Xu BCKDHB gene. -
Chain Acyl-Coa Dehydrogenase (Mcad) Deficiency
EXPLORING THERAPEUTIC APPROACHES FOR TREATMENT OF MEDIUM- CHAIN ACYL-COA DEHYDROGENASE (MCAD) DEFICIENCY by Heejung Kang BS, Sungkyunkwan University, South Korea, 2003 MS, Sungkyunkwan University, South Korea, 2005 MS, University of Minnesota, 2008 Submitted to the Graduate Faculty of Graduate School of Public Health in partial fulfillment of the requirements for the degree of Doctor of Philosophy University of Pittsburgh 2014 UNIVERSITY OF PITTSBURGH GRADUATE SCHOOL OF PUBLIC HEALTH This dissertation was presented by Heejung Kang It was defended on April 15, 2014 and approved by Dissertation Advisor: Jerry Vockley, M.D. Ph.D., Professor, Pediatrics, School of Medicine, University of Pittsburgh Committee Chair: Robert Ferrell, Ph.D., Professor, Human Genetics, Graduate School of Public Health, University of Pittsburgh David Finegold, Ph.D., Professor, Pediatrics, School of Medicine, University of Pittsburgh Al-Walid A. Mohsen, Ph.D., Research Associate Professor of Pediatrics School of Medicine, University of Pittsburgh Zsolt Urban, Ph.D., Associate Professor, Human Genetics, Graduate School of Public Health, University of Pittsburgh ii Copyright © by Heejung Kang 2014 iii Jerry Vockley, MD, PhD EXPLORING THERAPEUTIC APPROACHES FOR TREATMENT OF MEDIUM- CHAIN ACYL-COA DEHYDROGENASE (MCAD) DEFICIENCY Heejung Kang, PhD University of Pittsburgh, 2014 ABSTRACT Medium chain acyl-CoA dehydrogenase deficiency (MCADD) is a common biochemical genetic disorder in the US. Nearly 90% of alleles from MCADD patients contain a common mutation in the ACADM (c.985A>G). The change replaces a lysine with a glutamate (K304E), causing improper folding. The K304E protein can fold to a mature form and is then stable and active when expressed in a prokaryotic system with molecular chaperonins.