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Open AccessArticle

A Novel CCT5 Missense Variant Associated with Early Onset Motor Neuropathy

Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties, University of Palermo, 90127 Palermo, Italy
Department of Biomedicine, Neuroscience and Advanced Diagnostics (BIND), University of Palermo, 90127 Palermo, Italy
Department of Biomolecular Strategies, Genetics and Advanced Therapies, Euro-Mediterranean Institute of Science and Technology (IEMEST), 90139 Palermo, Italy
Department of Medical Sciences, University of Torino, 10126 Torino, Italy
Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù IRCSS, 00146 Rome, Italy
Department of Psychological, Pedagogical and Educational Sciences, University of Palermo, 90128 Palermo, Italy
Department of Physics and Chemistry—Emilio Segrè, University of Palermo, 90128 Palermo, Italy
Ionic Liquids Laboratory, Institute of Structure of Matter, Italian National Research Council (ISM-CNR), 00133 Rome, Italy
Department of Microbiology and Immunology, School of Medicine, University of Maryland at Baltimore-Institute of Marine and Environmental Technology (IMET), Baltimore, MD 21202, USA
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Int. J. Mol. Sci. 2020, 21(20), 7631;
Received: 16 September 2020 / Revised: 5 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
Diseases associated with acquired or genetic defects in members of the chaperoning system (CS) are increasingly found and have been collectively termed chaperonopathies. Illustrative instances of genetic chaperonopathies involve the genes for chaperonins of Groups I (e.g., Heat shock protein 60, Hsp60) and II (e.g., Chaperonin Containing T-Complex polypeptide 1, CCT). Examples of the former are hypomyelinating leukodystrophy 4 (HLD4 or MitCHAP60) and hereditary spastic paraplegia (SPG13). A distal sensory mutilating neuropathy has been linked to a mutation [p.(His147Arg)] in subunit 5 of the CCT5 gene. Here, we describe a new possibly pathogenic variant [p.(Leu224Val)] of the same subunit but with a different phenotype. This yet undescribed disease affects a girl with early onset demyelinating neuropathy and a severe motor disability. By whole exome sequencing (WES), we identified a homozygous CCT5 c.670C>G p.(Leu224Val) variant in the CCT5 gene. In silico 3D-structure analysis and bioinformatics indicated that this variant could undergo abnormal conformation and could be pathogenic. We compared the patient’s clinical, neurophysiological and laboratory data with those from patients carrying p.(His147Arg) in the equatorial domain. Our patient presented signs and symptoms absent in the p.(His147Arg) cases. Molecular dynamics simulation and modelling showed that the Leu224Val mutation that occurs in the CCT5 intermediate domain near the apical domain induces a conformational change in the latter. Noteworthy is the striking difference between the phenotypes putatively linked to mutations in the same CCT subunit but located in different structural domains, offering a unique opportunity for elucidating their distinctive roles in health and disease View Full-Text
Keywords: CCT5; chaperonins; chaperoning system; genetic variants; mutation; genetic chaperonopathies; motor neuropathy CCT5; chaperonins; chaperoning system; genetic variants; mutation; genetic chaperonopathies; motor neuropathy
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MDPI and ACS Style

Antona, V.; Scalia, F.; Giorgio, E.; Radio, F.C.; Brusco, A.; Oliveri, M.; Corsello, G.; Lo Celso, F.; Vadalà, M.; Conway de Macario, E.; Macario, A.J.L.; Cappello, F.; Giuffrè, M. A Novel CCT5 Missense Variant Associated with Early Onset Motor Neuropathy. Int. J. Mol. Sci. 2020, 21, 7631.

AMA Style

Antona V, Scalia F, Giorgio E, Radio FC, Brusco A, Oliveri M, Corsello G, Lo Celso F, Vadalà M, Conway de Macario E, Macario AJL, Cappello F, Giuffrè M. A Novel CCT5 Missense Variant Associated with Early Onset Motor Neuropathy. International Journal of Molecular Sciences. 2020; 21(20):7631.

Chicago/Turabian Style

Antona, Vincenzo; Scalia, Federica; Giorgio, Elisa; Radio, Francesca C.; Brusco, Alfredo; Oliveri, Massimiliano; Corsello, Giovanni; Lo Celso, Fabrizio; Vadalà, Maria; Conway de Macario, Everly; Macario, Alberto J.L.; Cappello, Francesco; Giuffrè, Mario. 2020. "A Novel CCT5 Missense Variant Associated with Early Onset Motor Neuropathy" Int. J. Mol. Sci. 21, no. 20: 7631.

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