To the Editor.
—Chromatin is the complex structure formed by the specific association of DNA with a variety of proteins, forming nucleosomes that in turn are arranged into a superhelix.1 The biologic activity of chromatin as a template for transcription of DNA into RNA is directly related to its state of condensation.1 Many degenerative diseases of the nervous system are associated with increased condensation of the chromatin, recognizable at the light microscopic level by the presence of shrunken, hyperchromatic nuclei. Bradley and Krasin2 recently suggested the intriguing hypothesis that the chromatin alteration in the anterior horn cells of patients with amyotrophic lateral sclerosis (ALS) may be caused by lesions of the DNA that are not repaired.Studies by Crapper et al3 and Lewis et al4 provided physical and biochemical evidence of an altered chromatin structure in Alzheimer's disease. Crapper et al3 first showed that
Feit H. Chromatin Alterations in Neurologic Disease. Arch Neurol. 1983;40(8):528. doi:10.1001/archneur.1983.04210070068023
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