Immunohistochemical localization and distribution of torsinA in normal human and rat brain

Brain Res. 2000 Jan 24;853(2):197-206. doi: 10.1016/s0006-8993(99)02232-5.

Abstract

Dystonia is a disease of basal ganglia function, the pathophysiology of which is poorly understood. Primary torsion dystonia is one of the most severe types of inherited dystonia and can be transmitted in an autosomal dominant manner. Recently, one mutation causing this disorder was localized to a gene on chromosome 9q34, designated DYT1, which encodes for a novel protein termed torsinA. The role of this protein in cellular function, in either normal or dystonic individuals is not known. We have developed a polyclonal antibody to torsinA and report its localization and distribution in normal human and rat brain. We demonstrate that torsinA is widely expressed in brain and peripheral tissues. Immunohistochemical studies of normal human and rat brain reveal the presence of torsinA in the dopaminergic neurons of the substantia nigra pars compacta (SNc), in addition to many other regions, including neocortex, hippocampus, and cerebellum. Labeling is restricted to neurons, as shown by double-immunofluorescence microscopy, and is present in both nuclei and cytoplasm. An ATP-binding property for torsinA has been suggested by its homology to ATP-binding proteins; this was confirmed by enrichment of torsinA in ATP-agarose affinity-purified fractions from tissue homogenates. An understanding of the role of torsinA in cellular function and the impact of the mutation (deletion of a glutamic acid at residue 303) is likely to provide insights into the etiopathogenesis of primary dystonia.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism
  • Adult
  • Animals
  • Antibodies / isolation & purification
  • Antibodies / metabolism
  • Antibody Specificity
  • Blotting, Western
  • Brain / cytology
  • Brain / metabolism*
  • Brain Stem / cytology
  • Brain Stem / metabolism
  • COS Cells
  • Carrier Proteins / biosynthesis*
  • Carrier Proteins / genetics
  • Carrier Proteins / immunology
  • Cerebellum / cytology
  • Cerebellum / metabolism
  • Dystonia Musculorum Deformans / genetics
  • Humans
  • Immunohistochemistry
  • Molecular Chaperones*
  • Neurons / cytology
  • Neurons / metabolism
  • Organ Specificity
  • Rats
  • Reference Values
  • Spinal Cord / cytology
  • Spinal Cord / metabolism
  • Transfection

Substances

  • Antibodies
  • Carrier Proteins
  • Molecular Chaperones
  • TOR1A protein, human
  • Tor1a protein, rat
  • Adenosine Triphosphate