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Changes in protein function underlie the disease spectrum in patients with CHIP mutations.

Publication ,  Journal Article
Madrigal, SC; McNeil, Z; Sanchez-Hodge, R; Shi, C-H; Patterson, C; Scaglione, KM; Schisler, JC
Published in: J Biol Chem
December 13, 2019

Monogenetic disorders that cause cerebellar ataxia are characterized by defects in gait and atrophy of the cerebellum; however, patients often suffer from a spectrum of disease, complicating treatment options. Spinocerebellar ataxia autosomal recessive 16 (SCAR16) is caused by coding mutations in STUB1, a gene that encodes the multifunctional enzyme CHIP (C terminus of HSC70-interacting protein). The disease spectrum of SCAR16 includes a varying age of disease onset, cognitive dysfunction, increased tendon reflex, and hypogonadism. Although SCAR16 mutations span the multiple functional domains of CHIP, it is unclear whether the location of the mutation and the change in the biochemical properties of CHIP contributes to the clinical spectrum of SCAR16. In this study, we examined relationships between the clinical phenotypes of SCAR16 patients and the changes in biophysical, biochemical, and functional properties of the corresponding mutated protein. We found that the severity of ataxia did not correlate with age of onset; however, cognitive dysfunction, increased tendon reflex, and ancestry were able to predict 54% of the variation in ataxia severity. We further identified domain-specific relationships between biochemical changes in CHIP and clinical phenotypes and specific biochemical activities that associate selectively with either increased tendon reflex or cognitive dysfunction, suggesting that specific changes to CHIP-HSC70 dynamics contribute to the clinical spectrum of SCAR16. Finally, linear models of SCAR16 as a function of the biochemical properties of CHIP support the concept that further inhibiting mutant CHIP activity lessens disease severity and may be useful in the design of patient-specific targeted approaches to treat SCAR16.

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Published In

J Biol Chem

DOI

EISSN

1083-351X

Publication Date

December 13, 2019

Volume

294

Issue

50

Start / End Page

19236 / 19245

Location

United States

Related Subject Headings

  • Spinocerebellar Ataxias
  • Phenotype
  • Neurodevelopmental Disorders
  • Mutation
  • Multivariate Analysis
  • Monte Carlo Method
  • Humans
  • HSC70 Heat-Shock Proteins
  • Biochemistry & Molecular Biology
  • 34 Chemical sciences
 

Citation

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Madrigal, S. C., McNeil, Z., Sanchez-Hodge, R., Shi, C.-H., Patterson, C., Scaglione, K. M., & Schisler, J. C. (2019). Changes in protein function underlie the disease spectrum in patients with CHIP mutations. J Biol Chem, 294(50), 19236–19245. https://doi.org/10.1074/jbc.RA119.011173
Madrigal, Sabrina C., Zipporah McNeil, Rebekah Sanchez-Hodge, Chang-He Shi, Cam Patterson, Kenneth Matthew Scaglione, and Jonathan C. Schisler. “Changes in protein function underlie the disease spectrum in patients with CHIP mutations.J Biol Chem 294, no. 50 (December 13, 2019): 19236–45. https://doi.org/10.1074/jbc.RA119.011173.
Madrigal SC, McNeil Z, Sanchez-Hodge R, Shi C-H, Patterson C, Scaglione KM, et al. Changes in protein function underlie the disease spectrum in patients with CHIP mutations. J Biol Chem. 2019 Dec 13;294(50):19236–45.
Madrigal, Sabrina C., et al. “Changes in protein function underlie the disease spectrum in patients with CHIP mutations.J Biol Chem, vol. 294, no. 50, Dec. 2019, pp. 19236–45. Pubmed, doi:10.1074/jbc.RA119.011173.
Madrigal SC, McNeil Z, Sanchez-Hodge R, Shi C-H, Patterson C, Scaglione KM, Schisler JC. Changes in protein function underlie the disease spectrum in patients with CHIP mutations. J Biol Chem. 2019 Dec 13;294(50):19236–19245.

Published In

J Biol Chem

DOI

EISSN

1083-351X

Publication Date

December 13, 2019

Volume

294

Issue

50

Start / End Page

19236 / 19245

Location

United States

Related Subject Headings

  • Spinocerebellar Ataxias
  • Phenotype
  • Neurodevelopmental Disorders
  • Mutation
  • Multivariate Analysis
  • Monte Carlo Method
  • Humans
  • HSC70 Heat-Shock Proteins
  • Biochemistry & Molecular Biology
  • 34 Chemical sciences