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Aksu-Menges E, Eylem CC, Nemutlu E, Gizer M, Korkusuz P, Topaloglu H, Talim B, Balci-Hayta B. Reduced mitochondrial fission and impaired energy metabolism in human primary skeletal muscle cells of Megaconial Congenital Muscular Dystrophy. Sci Rep 2021; 11:18161. [PMID: 34518586 PMCID: PMC8438035 DOI: 10.1038/s41598-021-97294-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2021] [Accepted: 08/13/2021] [Indexed: 11/09/2022] Open
Abstract
Megaconial Congenital Muscular Dystrophy (CMD) is a rare autosomal recessive disorder characterized by enlarged mitochondria located mainly at the periphery of muscle fibers and caused by mutations in the Choline Kinase Beta (CHKB) gene. Although the pathogenesis of this disease is not well understood, there is accumulating evidence for the presence of mitochondrial dysfunction. In this study, we aimed to investigate whether imbalanced mitochondrial dynamics affects mitochondrial function and bioenergetic efficiency in skeletal muscle cells of Megaconial CMD. Immunofluorescence, confocal and transmission electron microscopy studies revealed impaired mitochondrial network, morphology, and localization in primary skeletal muscle cells of Megaconial CMD. The organelle disruption was specific only to skeletal muscle cells grown in culture. The expression levels of mitochondrial fission proteins (DRP1, MFF, FIS1) were found to be decreased significantly in both primary skeletal muscle cells and tissue sections of Megaconial CMD by Western blotting and/or immunofluorescence analysis. The metabolomic and fluxomic analysis, which were performed in Megaconial CMD for the first time, revealed decreased levels of phosphonucleotides, Krebs cycle intermediates, ATP, and altered energy metabolism pathways. Our results indicate that reduced mitochondrial fission and altered mitochondrial energy metabolism contribute to mitochondrial dysmorphology and dysfunction in the pathogenesis of Megaconial CMD.
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Affiliation(s)
- Evrim Aksu-Menges
- Department of Medical Biology, Faculty of Medicine, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Cemil Can Eylem
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Emirhan Nemutlu
- Department of Analytical Chemistry, Faculty of Pharmacy, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Merve Gizer
- Department of Stem Cell Sciences, Graduate School of Health Sciences, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Petek Korkusuz
- Department of Histology and Embryology, Faculty of Medicine, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Haluk Topaloglu
- Department of Pediatrics, Division of Child Neurology, Faculty of Medicine, Hacettepe University, 06100, Sihhiye, Ankara, Turkey.,Department of Pediatrics, Yeditepe University, Istanbul, Turkey
| | - Beril Talim
- Department of Pediatrics, Pathology Unit, Faculty of Medicine, Hacettepe University, 06100, Sihhiye, Ankara, Turkey
| | - Burcu Balci-Hayta
- Department of Medical Biology, Faculty of Medicine, Hacettepe University, 06100, Sihhiye, Ankara, Turkey.
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Kutluk G, Kadem N, Bektas O, Eroglu HN. A Rare Cause of Autism Spectrum Disorder: Megaconial Muscular Dystrophy. Ann Indian Acad Neurol 2020; 23:694-696. [PMID: 33623274 PMCID: PMC7887486 DOI: 10.4103/aian.aian_98_19] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 03/14/2019] [Indexed: 12/27/2022] Open
Abstract
Megaconial congenital muscular dystrophy (OMIM 602541) is defined by early-onset hypotonia, mildly elevated serum creatine kinase (CK) levels, muscle wasting, cardiomyopathy, psychomotor developmental delay and intellectual disability. The disease is caused by loss-of-function mutations in Choline kinase beta gene (CHKB) and has specific muscle biopsy findings. Here we investigate two patients with weakness of proximal muscles and generalized muscle atrophy, skin changes, agressiveness, social communication and empathy difficulties. Both patients had mildly elevated serum CK levels. Whole exome sequencing (WES) performed for both patients and homozygous c.818+1G>A and homozygous c.1031+1G>A variants were detected in patient 1 and patient 2, respectively. We would like to draw the attention of autism spectrum disorder in early diagnosis of congenital muscular dystrophies.
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Affiliation(s)
- Gultekin Kutluk
- Antalya Training and Research Hospital, Pediatric Neurology Clinic, Ankara, Turkey
| | - Naz Kadem
- Antalya Training and Research Hospital, Pediatrics Clinic, Ankara, Turkey
| | - Omer Bektas
- Ankara University Faculty of Medicine, Department of Pediatric Neurology, Ankara, Turkey
| | - Hatice Nur Eroglu
- Antalya Training and Research Hospital, Pediatrics Clinic, Ankara, Turkey
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3
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Kutluk MG, Kadem N, Bektas O, Randa NC, Tuncer GO, Albayrak P, Eminoglu T, Teber ST. A Novel Variant of COL6A2 Gene Causing Bethlem Myopathy and Evaluation of Essential Hypertension. Ann Indian Acad Neurol 2020; 24:280-282. [PMID: 34220088 PMCID: PMC8232516 DOI: 10.4103/aian.aian_247_20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/06/2020] [Accepted: 05/27/2020] [Indexed: 01/08/2023] Open
Affiliation(s)
- M Gultekin Kutluk
- Department of Paediatric Neurology, Antalya Research and Training Hospital, Antalya, Turkey
| | - Naz Kadem
- Department of Paediatrics, Antalya Research and Training Hospital, Antalya, Turkey
| | - Omer Bektas
- Department of Paediatric Neurology, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Nadide Cemre Randa
- Department of Medical Genetics, Antalya Research and Training Hospital, Antalya, Turkey
| | - Gökcen Oz Tuncer
- Department of Paediatric Neurology, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Pelin Albayrak
- Department of Paediatric Neurology, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Tuba Eminoglu
- Department of Paediatric Metabolism, Ankara University Faculty of Medicine, Ankara, Turkey
| | - Serap Tiras Teber
- Department of Paediatric Neurology, Ankara University Faculty of Medicine, Ankara, Turkey
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4
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Alteration of mitochondrial membrane inner potential in three Italian patients with megaconial congenital muscular dystrophy carrying new mutations in CHKB gene. Mitochondrion 2019; 47:24-29. [PMID: 30986505 DOI: 10.1016/j.mito.2019.04.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 02/09/2019] [Accepted: 04/10/2019] [Indexed: 11/20/2022]
Abstract
Congenital Muscular Dystrophies (CMDs) are a heterogeneous group of autosomal recessive disorders presenting at birth with psychomotor delay, cognitive impairment, muscle weakness and hypotonia. Here we described an alteration of mitochondrial inner membrane potential and mitochondrial network in cells derived from Italian patients carrying three novel mutations in CHKB gene, recently associated with "megaconial CMD". On the bases of our findings, we hypothesize that the mitochondrial membrane potential alteration, presumably as a consequence of the altered biosynthesis of phosphatidylcholine, could be responsible for the peculiar morphological aspect of mitochondria in this disease and might be involved in the disease pathogenesis.
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YİŞ ULUÇ, DİNİZ GÜLDEN, HAZAN FILIZ, DAİMAGÜLER HÜLYASEVCAN, BAYSAL BAHARTOKLU, BAYDAN FIGEN, AKINCI GÜLÇIN, ÜNALP AYCAN, AKTAN GÜL, BAYRAM ERHAN, HIZ SEMRA, PAKETÇİ CEM, OKUR DERYA, ÖZER ERDENER, DANYELİ AYÇAERSEN, POLAT MUZAFFER, UYANIK GÖKHAN, ÇIRAK SEBAHATTIN. Childhood onset limb-girdle muscular dystrophies in the Aegean part of Turkey. ACTA MYOLOGICA : MYOPATHIES AND CARDIOMYOPATHIES : OFFICIAL JOURNAL OF THE MEDITERRANEAN SOCIETY OF MYOLOGY 2018; 37:210-220. [PMID: 30838351 PMCID: PMC6390111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The aim of this study is to analyze the epidemiology of the clinical and genetic features of childhood-onset limb-girdle muscular dystrophies (LGMD) in the Aegean part of Turkey. In total fifty-six pediatric cases with LGMD followed in four different pediatric neurology departments in the Aegean region of Turkey were evaluated. Among them, LGMD2C was the most common followed by LGMD2A, LGMD2D, and LGMD2F with equal frequencies. In twenty-eight patients (50%) the diagnosis could be confirmed by genetic analysis, where SGCG proved to be disease-causing in most of the cases. About half of the patients were diagnosed with whole exome or targeted gene sequencing. A positive correlation between muscle biopsy and genetic findings were observed in 11% of the patients. We report one novel frameshifting mutation in TTN. Knowledge on frequencies of childhood-onset limb-girdle muscular dystrophies and related genes in Turkey will lead to a prompt diagnosis of these neuromuscular disorders.
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Affiliation(s)
- ULUÇ YİŞ
- Dokuz Eylül University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, İzmir, Turkey,Address for correspondence: Uluç Yiş, Dokuz Eylül
University School of Medicine Department of Pediatrics Division of
Child Neurology, 35340/Balçova/İzmir. Tel. +90 232
4126216. E-mail:
| | - GÜLDEN DİNİZ
- Neuromuscular Disease
Center, Tepecik Research Hospital, İzmir,
Turkey
| | - FILIZ HAZAN
- Dr Behçet Uz Children’s
Research Hospital, Department of Medical Genetics,
İzmir, Turkey
| | - HÜLYA SEVCAN DAİMAGÜLER
- University Hospital
Cologne, Department of Pediatrics, Cologne,
Germany, Center for Molecular Medicine Cologne
(CMMC), University of Cologne,
Cologne, Germany
| | - BAHAR TOKLU BAYSAL
- Dr Behçet Uz Children’s
Research Hospital, Department of Pediatric Neurology,
İzmir, Turkey
| | - FIGEN BAYDAN
- Neuromuscular Disease
Center, Tepecik Research Hospital, İzmir,
Turkey
| | - GÜLÇIN AKINCI
- Dr Behçet Uz Children’s
Research Hospital, Department of Pediatric Neurology,
İzmir, Turkey
| | - AYCAN ÜNALP
- Dr Behçet Uz Children’s
Research Hospital, Department of Pediatric Neurology,
İzmir, Turkey
| | - GÜL AKTAN
- Ege University, School of
Medicine, Department of Pediatrics, Division of Child
Neurology, İzmir, Turkey
| | - ERHAN BAYRAM
- Dokuz Eylül University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, İzmir, Turkey
| | - SEMRA HIZ
- Dokuz Eylül University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, İzmir, Turkey
| | - CEM PAKETÇİ
- Dokuz Eylül University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, İzmir, Turkey
| | - DERYA OKUR
- Dokuz Eylül University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, İzmir, Turkey
| | - ERDENER ÖZER
- Dokuz Eylül University,
School of Medicine, Department of Pathology,
İzmir, Turkey
| | - AYÇA ERSEN DANYELİ
- Dokuz Eylül University,
School of Medicine, Department of Pathology,
İzmir, Turkey
| | - MUZAFFER POLAT
- Celal Bayar University,
School of Medicine, Department of Pediatrics, Division of
Child Neurology, Manisa, Turkey
| | - GÖKHAN UYANIK
- Center for Medical Genetics,
Hanusch Hospital, Vienna,
Austria, Medical Faculty, Sigmund
Freud Private University, Vienna,
Austria
| | - SEBAHATTIN ÇIRAK
- University Hospital
Cologne, Department of Pediatrics, Cologne,
Germany, Center for Molecular Medicine Cologne
(CMMC), University of Cologne,
Cologne, Germany
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Wang H, Salter CG, Refai O, Hardy H, Barwick KES, Akpulat U, Kvarnung M, Chioza BA, Harlalka G, Taylan F, Sejersen T, Wright J, Zimmerman HH, Karakaya M, Stüve B, Weis J, Schara U, Russell MA, Abdul-Rahman OA, Chilton J, Blakely RD, Baple EL, Cirak S, Crosby AH. Choline transporter mutations in severe congenital myasthenic syndrome disrupt transporter localization. Brain 2017; 140:2838-2850. [PMID: 29088354 DOI: 10.1093/brain/awx249] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 08/05/2017] [Indexed: 11/12/2022] Open
Abstract
The presynaptic, high-affinity choline transporter is a critical determinant of signalling by the neurotransmitter acetylcholine at both central and peripheral cholinergic synapses, including the neuromuscular junction. Here we describe an autosomal recessive presynaptic congenital myasthenic syndrome presenting with a broad clinical phenotype due to homozygous choline transporter missense mutations. The clinical phenotype ranges from the classical presentation of a congenital myasthenic syndrome in one patient (p.Pro210Leu), to severe neurodevelopmental delay with brain atrophy (p.Ser94Arg) and extend the clinical outcomes to a more severe spectrum with infantile lethality (p.Val112Glu). Cells transfected with mutant transporter construct revealed a virtually complete loss of transport activity that was paralleled by a reduction in transporter cell surface expression. Consistent with these findings, studies to determine the impact of gene mutations on the trafficking of the Caenorhabditis elegans choline transporter orthologue revealed deficits in transporter export to axons and nerve terminals. These findings contrast with our previous findings in autosomal dominant distal hereditary motor neuropathy of a dominant-negative frameshift mutation at the C-terminus of choline transporter that was associated with significantly reduced, but not completely abrogated choline transporter function. Together our findings define divergent neuropathological outcomes arising from different classes of choline transporter mutation with distinct disease processes and modes of inheritance. These findings underscore the essential role played by the choline transporter in sustaining acetylcholine neurotransmission at both central and neuromuscular synapses, with important implications for treatment and drug selection.
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Affiliation(s)
- Haicui Wang
- University Hospital Cologne, Department of Pediatrics, Kerpener Str. 62, 50937 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Robert-Koch-Str. 21, 50931 Cologne, Germany
| | - Claire G Salter
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK.,Human Genetics and Genomic Medicine, Faculty of Medicine, University of Southampton, Southampton, SO16 6YD, UK
| | - Osama Refai
- Department of Biomedical Science, Charles E. Schmidt College of Medicine and Brain Institute, Florida Atlantic University, Jupiter, FL, USA
| | - Holly Hardy
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Katy E S Barwick
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Ugur Akpulat
- University Hospital Cologne, Department of Pediatrics, Kerpener Str. 62, 50937 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Robert-Koch-Str. 21, 50931 Cologne, Germany.,Kastamonu University, 37150 Kastamonu, Turkey
| | - Malin Kvarnung
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 17176 Stockholm, Sweden.,Department of Clinical Genetics, Karolinska University Hospital, 17176 Stockholm, Sweden
| | - Barry A Chioza
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Gaurav Harlalka
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Fulya Taylan
- Department of Molecular Medicine and Surgery, Center for Molecular Medicine, Karolinska Institutet, 17176 Stockholm, Sweden.,Science for Life Laboratory, Karolinska Institutet Science Park, 17121 Stockholm, Sweden
| | - Thomas Sejersen
- Science for Life Laboratory, Karolinska Institutet Science Park, 17121 Stockholm, Sweden.,Department of Women's and Children's Health, Division of Pediatric Neurology, Karolinska Institutet, 17176 Stockholm, Sweden
| | - Jane Wright
- Department of Pharmacology, Vanderbilt University, Nashville, TN, USA
| | - Holly H Zimmerman
- Division of Medical Genetics, University of Mississippi Medical Center, Jackson, Mississippi 39216, USA
| | - Mert Karakaya
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Robert-Koch-Str. 21, 50931 Cologne, Germany
| | - Burkhardt Stüve
- Children's Hospital Social Pediatric Center, 50735 Cologne, Germany
| | - Joachim Weis
- Institute of Neuropathology and Jülich Aachen Research Alliance (JARA) Brain Translational Medicine, RWTH Aachen University, 52074 Aachen, Germany
| | - Ulrike Schara
- University Children's Hospital Essen, Essen, Germany
| | - Mark A Russell
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Omar A Abdul-Rahman
- Department of Pediatrics, University of Mississippi Medical Center, Jackson, Mississippi 39216, USA
| | - John Chilton
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Randy D Blakely
- Department of Biomedical Science, Charles E. Schmidt College of Medicine and Brain Institute, Florida Atlantic University, Jupiter, FL, USA
| | - Emma L Baple
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
| | - Sebahattin Cirak
- University Hospital Cologne, Department of Pediatrics, Kerpener Str. 62, 50937 Cologne, Germany.,Center for Molecular Medicine Cologne (CMMC), University of Cologne, Robert-Koch-Str. 21, 50931 Cologne, Germany
| | - Andrew H Crosby
- RILD Wellcome Wolfson Centre, Royal Devon and Exeter NHS Foundation Trust, Barrack Road, Exeter, EX2 5DW, UK
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Congenital mirror movements in a patient with alpha-dystroglycanopathy due to a novel POMK mutation. Neuromuscul Disord 2017; 27:239-242. [DOI: 10.1016/j.nmd.2016.12.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 12/05/2016] [Accepted: 12/12/2016] [Indexed: 11/21/2022]
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