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Misumi Y, Yamashita T, Kuratomi A, Murakami Y, Fujita A, Matsumoto N, Ueda M. Long-term course of a case with a novel homozygous kyphoscoliosis peptidase variant. J Hum Genet 2024; 69:345-348. [PMID: 38589508 DOI: 10.1038/s10038-024-01250-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Revised: 03/16/2024] [Accepted: 03/27/2024] [Indexed: 04/10/2024]
Abstract
We herein report a case with a novel homozygous variant in the kyphoscoliosis peptidase (KY) gene. A 58-year-old Japanese female was referred to our hospital with a gait disturbance that gradually worsened after the age of 50. She had bilateral equinus foot deformity since early childhood. Neurological examination revealed moderate weakness of the neck, trunk, femoral, and brachial muscles, mild respiratory failure, and areflexia. Whole-exome sequencing revealed a novel homozygous frameshift variant of the KY gene, NM_178554.6:c.824del p.(Glu275Glyfs*53). Our case demonstrated that KY-associated neuromuscular disease can present with extremely slow progressive muscle weakness and respiratory failure over a long natural course.
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Affiliation(s)
- Yohei Misumi
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan.
| | - Taro Yamashita
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Aki Kuratomi
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yoshitaka Murakami
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Atsushi Fujita
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Naomichi Matsumoto
- Department of Human Genetics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Mitsuharu Ueda
- Department of Neurology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
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Uhrova-Meszarosova A, Vlckova M, Rennerova L, Haberlova J, Zamecnik J, Seeman P, Safka-Brozkova D. A progressive KY myopathy could be caused by a missense pathogenic variant. Clin Genet 2023; 103:723-725. [PMID: 36683559 DOI: 10.1111/cge.14302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/24/2023]
Affiliation(s)
- Anna Uhrova-Meszarosova
- Neurogenetic Laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Marketa Vlckova
- Department of Medical Genetics, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | | | - Jana Haberlova
- Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Josef Zamecnik
- Department of Pathology and Molecular Medicine 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Pavel Seeman
- Neurogenetic Laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic.,Department of Medical Genetics, Masaryk Hospital, Ústí nad Labem, Czech Republic
| | - Dana Safka-Brozkova
- Neurogenetic Laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
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Ehsani E, Khamirani HJ, Abbasi Z, Kamal N, Zoghi S, Mohammadi S, Dianatpour M, Tabei SMB, Mohamadjani O, Dastgheib SA. Genotypic and phenotypic spectrum of Myofibrillar Myopathy 7 as a result of Kyphoscoliosis Peptidase deficiency: The first description of a missense mutation in KY and literature review. Eur J Med Genet 2022; 65:104552. [PMID: 35752288 DOI: 10.1016/j.ejmg.2022.104552] [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: 11/16/2021] [Revised: 04/25/2022] [Accepted: 06/19/2022] [Indexed: 11/03/2022]
Abstract
KY is located on chromosome 3 and encodes a transglutaminase-like protein in the skeletal muscles, namely Kyphoscoliosis Peptidase. KY is primarily involved in the formation and stabilization of neuromuscular intersections making it essential for the development of the musculoskeletal system. Mutations in KY cause Myofibrillar Myopathy-7 (MFM-7) and Hereditary Spastic Paraplegia (HSP). MFM-7 is an early onset muscle disorder with an autosomal recessive inheritance marked by progressive muscle weakness and joint contractures. Herein, we describe an Iranian family with MFM-7 caused by a homozygous novel variant in KY. We identified a homozygous variant (NM_178554.6:c.1247T > A, p. Ile416Asn) in KY in two patients born to consanguineous parents and the same heterozygous mutation in their parent by Whole-Exome Sequencing. The patients manifest muscle weakness, muscle atrophy, mobility restriction, and hyporeflexia. Lastly, we reviewed the phenotype and corresponding genotype of the previously reported cases with pathogenic variants in KY.
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Affiliation(s)
- Elham Ehsani
- Comprehensive Medical Genetic Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Hossein Jafari Khamirani
- Department of Medical Genetics, Shiraz University of Medical Sciences, Shiraz, Iran; Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Zahra Abbasi
- Department of Medical Genetics, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Neda Kamal
- Department of Medical Genetics, Shiraz University of Medical Sciences, Shiraz, Iran; Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sina Zoghi
- Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Sanaz Mohammadi
- Comprehensive Medical Genetic Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mehdi Dianatpour
- Department of Medical Genetics, Shiraz University of Medical Sciences, Shiraz, Iran; Stem Cells Technology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Seyed Mohammad Bagher Tabei
- Department of Medical Genetics, Shiraz University of Medical Sciences, Shiraz, Iran; Maternal-fetal Medicine Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Omid Mohamadjani
- Student Research Committee, Shiraz University of Medical Sciences, Shiraz, Iran
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Arif B, Rasheed A, Kumar KR, Fatima A, Abbas G, Wohler E, Sobriera N, Lohmann K, Naz S. A novel homozygous KY variant causing a complex neurological disorder. Eur J Med Genet 2020; 63:104031. [PMID: 32818658 DOI: 10.1016/j.ejmg.2020.104031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 07/17/2020] [Accepted: 07/31/2020] [Indexed: 01/06/2023]
Abstract
Mutations in the gene kyphoscoliosis peptidase (KY) are known to cause myofibrillar myopathy-7 and hereditary spastic paraplegia. We investigated the genetic cause of a complex neurological phenotype in a consanguineous Pakistani family with four affected members, manifesting lower limb spasticity and weakness, toe walking, pes equinovarus, and a speech disorder. Genome-wide linkage analysis with microsatellite markers delineated chromosome 3q22.2-q24 harboring the disease gene. Whole exome sequencing was performed for two subjects, identifying a homozygous 14-bp frameshift deletion NM_178554.6:c.842_855del; p(Val281GlyfsTer18) in KY. The variant segregated with the phenotype and was absent from public databases and 100 ethnically matched controls. We confirm a novel homozygous KY variant causing a complex neurological phenotype in this family. A review of previously reported KY variants suggests that variants in this gene can cause a spectrum of neurological phenotypes.
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Affiliation(s)
- Beenish Arif
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Arisha Rasheed
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Kishore R Kumar
- Molecular Medicine Laboratory, Concord Repatriation General Hospital, Sydney, Australia; Kinghorn Centre for Clinical Genomics, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia; Sydney Medical School, University of Sydney, Sydney, Australia
| | - Amara Fatima
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Ghazanfar Abbas
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan
| | - Elizabeth Wohler
- McKusick-Nathans Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Nara Sobriera
- McKusick-Nathans Department of Genetic Medicine, Johns Hopkins University School of Medicine, Baltimore, MD, USA
| | - Katja Lohmann
- Institute of Neurogenetics, University of Lubeck, Lubeck, Germany
| | - Sadaf Naz
- School of Biological Sciences, University of the Punjab, Lahore, Pakistan.
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Cracknell T, Mannsverk S, Nichols A, Dowle A, Blanco G. Proteomic resolution of IGFN1 complexes reveals a functional interaction with the actin nucleating protein COBL. Exp Cell Res 2020; 395:112179. [PMID: 32768501 PMCID: PMC7584501 DOI: 10.1016/j.yexcr.2020.112179] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Revised: 07/06/2020] [Accepted: 07/11/2020] [Indexed: 01/09/2023]
Abstract
The Igfn1 gene produces multiple proteins by alternative splicing predominantly expressed in skeletal muscle. Igfn1 deficient clones derived from C2C12 myoblasts show reduced fusion index and morphological differences compared to control myotubes. Here, we first show that G:F actin ratios are significantly higher in differentiating IGFN1-deficient C2C12 myoblasts, suggesting that fusion and differentiation defects are underpinned by deficient actin remodelling. We obtained pull-downs from skeletal muscle with IGFN1 fragments and applied a proteomics approach. The proteomic composition of IGFN1 complexes identified the cytoskeleton and an association with the proteasome as the main networks. The actin nucleating protein COBL was selected for further validation. COBL is expressed in C2C12 myoblasts from the first stages of myoblast fusion but not in proliferating cells. COBL is also expressed in adult muscle and, as IGFN1, localizes to the Z-disc. We show that IGFN1 interacts, stabilizes and colocalizes with COBL and prevents the ability of COBL to form actin ruffles in COS7 cells. COBL loss of function C2C12-derived clones are able to fuse, therefore indicating that COBL or the IGFN1/COBL interaction are not essential for myoblast fusion.
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Affiliation(s)
| | - Steinar Mannsverk
- Department of Medical Biochemistry and Microbiology, Uppsala University, Uppsala, Sweden
| | - Angus Nichols
- Department of Biology, University of York, York, YO32 5UQ, UK
| | - Adam Dowle
- Technology Facility, Department of Biology, University of York, York, YO32 5UQ, UK
| | - Gonzalo Blanco
- Department of Biology, University of York, York, YO32 5UQ, UK.
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Multisystem Myotilinopathy, including Myopathy and Left Ventricular Noncompaction, due to the MYOT Variant c.179C>T. Case Rep Cardiol 2020; 2020:5128069. [PMID: 32509353 PMCID: PMC7244945 DOI: 10.1155/2020/5128069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 04/18/2020] [Accepted: 05/05/2020] [Indexed: 11/20/2022] Open
Abstract
Left ventricular hypertrabeculation/noncompaction is a myocardial abnormality of unknown etiology/pathogenesis, which is frequently associated with neuromuscular disorders or chromosomal defects. LVHT in association with a MYOT mutation has not been reported. The patient is a 72-year-old male with a history of strabismus in childhood, asymptomatic creatine-kinase elevation since age 42 years, slowly progressive lower limb weakness since age 60 years, slowly progressive dysarthria and dysphagia since age 62 years, and recurrent episodes of arthralgias and myalgias since age 71 years. He also had arterial hypertension, diverticulosis, hyperlipidemia, coronary heart disease, and a hiatal hernia with reflux esophagitis. Clinical exam revealed mild quadruparesis and proximal wasting of the legs. Whole exome sequencing revealed a known variant in the MYOT gene. Muscle biopsy, previously assessed as inclusion body myopathy, was compatible with the genotype after revision. Cardiologic work-up revealed a left anterior hemiblock, mild myocardial thickening, and noncompaction. This case shows that myotilinopathy may manifest as a multisystem disease, including noncompaction.
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