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Journal of veterinary internal medicine2023; 37(4); 1568-1579; doi: 10.1111/jvim.16784

Cerebellar axonopathy in Shivers horses identified by spatial transcriptomic and proteomic analyses.

Abstract: Shivers in horses is characterized by abnormal hindlimb movement when walking backward and is proposed to be caused by a Purkinje cell (PC) axonopathy based on histopathology. Objective: Define region-specific differences in gene expression within the lateral cerebellar hemisphere and compare cerebellar protein expression between Shivers horses and controls. Methods: Case-control study of 5 Shivers and 4 control geldings ≥16.2 hands in height. Methods: Using spatial transcriptomics, gene expression was compared between Shivers and control horses in PC soma and lateral cerebellar hemisphere white matter, consisting primarily of axons. Tandem-mass-tag (TMT-11) proteomic analysis was performed on lateral cerebellar hemisphere homogenates. Results: Differences in gene expression between Shivers and control horses were evident in principal component analysis of axon-containing white matter but not PC soma. In white matter, there were 455/1846 differentially expressed genes (DEG; 350 ↓DEG, 105 ↑DEG) between Shivers and controls, with significant gene set enrichment of the Toll-Like Receptor 4 (TLR4) cascade, highlighting neuroinflammation. There were 50/936 differentially expressed proteins (DEP). The 27 ↓DEP highlighted loss of axonal proteins including intermediate filaments (5), myelin (3), cytoskeleton (2), neurite outgrowth (2), and Na/K ATPase (1). The 23 ↑DEP were involved in the extracellular matrix (7), cytoskeleton (7), redox balance (2), neurite outgrowth (1), signal transduction (1), and others. Conclusions: Our findings support axonal degeneration as a characteristic feature of Shivers. Combined with histopathology, these findings are consistent with the known distinctive response of PC to injury where axonal changes occur without a substantial impact on PC soma.
Publication Date: 2023-06-08 PubMed ID: 37288990PubMed Central: PMC10365050DOI: 10.1111/jvim.16784Google Scholar: Lookup
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  • Journal Article

Summary

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The research examines the characteristic symptoms of ‘Shivers’, an ailment in horses, and suggests that it might be caused by degeneration of Purkinje cell axons in the brain. Using advanced spatial transcriptomic and proteomic analyses, the researchers compared the gene and protein expressions in the cerebellums of shivering horses to those of healthy horses.

Objective and Methodology

  • The research aimed to discover region-specific differences in gene expression within the lateral cerebellar hemisphere and contrast cerebellar protein expression between Shivers-inflicted horses and healthy horses.
  • The study was conducted on 5 Shivers horses and 4 control horses, all geldings and all ≥16.2 hands in height.
  • Spatial transcriptomics allowed researchers to compare gene expression between sick and healthy horses in the Purkinje cell soma and the white matter of the lateral cerebellar hemisphere that primarily consists of axons.
  • Tandem-mass-tag (TMT-11) proteomic analysis was conducted on the homogenates from the lateral cerebellar hemisphere.

Findings

  • The results showed a discernable difference in gene expression between the shivering and healthy horses, especially in the principal component analysis of the axon-containing white matter.
  • Of the 1846 genes analyzed, 455 were differentially expressed genes (DEGs) including 350 downregulated and 105 upregulated genes. These findings highlighted a significant gene set enrichment of the TLR4 cascade, indicating neuroinflammation in affected horses.
  • Out of 936 proteins analyzed, 50 were differentially expressed proteins (DEPs), out of which 27 were downregulated and mostly associated with axonal proteins. This result suggests a loss of axonal proteins like intermediate filaments, myelin, cytoskeleton, neurite outgrowth, and Na/K ATPase in shivering horses.
  • Among the 23 upregulated proteins, many were involved in the extracellular matrix, signal transduction, and redox balance, indicating additional adaptive or compensatory changes.

Conclusions

  • The findings substantiate that axonal degeneration is a characteristic feature of the ‘Shivers’ ailment in horses – a condition in which horses display abnormal hindlimb movement when walking backward.
  • In combination with histopathological studies, the findings complement the known fact that injury to the Purkinje cell can lead to axonal changes without impacting the Purkinje cell soma substantially, which aligns with the observed condition in Shivers horses.

Cite This Article

APA
Valberg SJ, Williams ZJ, Henry ML, Finno CJ. (2023). Cerebellar axonopathy in Shivers horses identified by spatial transcriptomic and proteomic analyses. J Vet Intern Med, 37(4), 1568-1579. https://doi.org/10.1111/jvim.16784

Publication

ISSN: 1939-1676
NlmUniqueID: 8708660
Country: United States
Language: English
Volume: 37
Issue: 4
Pages: 1568-1579

Researcher Affiliations

Valberg, Stephanie J
  • Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.
Williams, Zoë J
  • C. Wayne McIlwraith Translational Medicine, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins, Colorado, USA.
Henry, Marisa L
  • Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University, East Lansing, Michigan, USA.
Finno, Carrie J
  • Department of Population Health and Reproduction, School of Veterinary Medicine, University of California-Davis, Davis, California, USA.

Grant Funding

  • Mary Anne McPhail Endowment Michigan State University
  • United States Equestrian Foundation

Conflict of Interest Statement

Dr. Valberg runs a commercial muscle biopsy service and receives royalties for genetic tests, but these have no overlap with the neurologic disease presented in this article. No other authors declare a conflict of interest.

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