A novel cct5 missense variant associated with early onset motor neuropathy

Vincenzo Antona, Federica Scalia, Elisa Giorgio, Francesca C. Radio, Alfredo Brusco, Massimiliano Oliveri, Giovanni Corsello, Fabrizio Lo Celso, Maria Vadalà, Everly Conway de Macario, Alberto J.L. Macario, Francesco Cappello, Mario Giuffrè

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number7631
Pages (from-to)1-12
Number of pages12
JournalInternational Journal of Molecular Sciences
Issue number20
Publication statusPublished - Oct 2 2020


  • CCT5
  • Chaperoning system
  • Chaperonins
  • Genetic chaperonopathies
  • Genetic variants
  • Motor neuropathy
  • Mutation

ASJC Scopus subject areas

  • Catalysis
  • Molecular Biology
  • Spectroscopy
  • Computer Science Applications
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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