Volume 49, Issue 1 pp. 14-23
Original Article

Widespread occurrence of intranuclear atrophin-1 accumulation in the central nervous system neurons of patients with dentatorubral-pallidoluysian atrophy

Mitsunori Yamada MD, PhD

Corresponding Author

Mitsunori Yamada MD, PhD

Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan

Department of Pathology, Brain Research Institute, Niigata University, 1 Asahimachi, Niigata 951-8585, JapanSearch for more papers by this author
Jonathan D. Wood PhD

Jonathan D. Wood PhD

Department of Psychiatry and Behavioral Sciences, Division of Neurobiology, Johns Hopkins University School of Medicine, Baltimore, MD

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Takayoshi Shimohata MD

Takayoshi Shimohata MD

Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan

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Shintaro Hayashi MD, PhD

Shintaro Hayashi MD, PhD

Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan

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Shoji Tsuji MD, PhD

Shoji Tsuji MD, PhD

Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan

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Christopher A. Ross MD, PhD

Christopher A. Ross MD, PhD

Department of Psychiatry and Behavioral Sciences, Division of Neurobiology, Johns Hopkins University School of Medicine, Baltimore, MD

Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD

Program in Cellular and Molecular Medicine, Johns Hopkins University School of Medicine, Baltimore, MD

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Hitoshi Takahashi MD, PhD

Hitoshi Takahashi MD, PhD

Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan

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Abstract

Dentatorubral-pallidoluysian atrophy (DRPLA) is an autosomal dominant neurodegenerative disorder caused by a CAG repeat expansion. In the present study of DRPLA, we have demonstrated immunohistochemically that diffuse accumulation of mutant atrophin-1 in the neuronal nuclei, rather than the formation of neuronal intranuclear inclusions (NIIs), was the predominant pathologic condition and involved a wide range of central nervous system regions far beyond the systems previously reported to be affected. In the neuronal nuclei harboring NIIs, promyelocytic leukemia protein (PML) nuclear bodies were redistributed into a single NII, and the CREB (cAMP-responsive element–binding protein)-binding protein was also recruited into NIIs. The results suggest that the novel lesion distribution revealed by the diffuse nuclear labeling may be responsible for a variety of clinical features, such as dementia and epilepsy in DRPLA, and that certain transcriptional abnormalities may be induced secondarily in neuronal nuclei with the formation of NIIs. Ann Neurol 2001;49:14–23

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