Frontiers in neurology · 2025
Non-coding repeat analyses in patients with Parkinson's disease.
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Hirano Makito, Samukawa Makoto, Miyatake Satoko, Yamagishi Yuko, Isono Chiharu, Yoshikawa Rino, Saigoh Kazumasa, Terayama Atsushi, Higashimoto Yuji, Koshimizu Eriko, Mizuguchi Takeshi, Fujii Kanako, Mitsui Yoshiyuki, Matsumoto Naomichi, Nagai Yoshitaka
Аннотация
INTRODUCTION: The genetic etiology of Parkinson's disease (PD) is complex; approximately 10% of patients with PD have various gene mutations that lead to familial forms of the disease. Recent analyses of non-coding repeat regions revealed that many neurodegenerative diseases are associated with pathological expansions. We evaluated the genetic background of non-coding repeat expansions in Japanese patients with PD.
METHODS: We collected blood samples from 203 Japanese patients with PD and analyzed various non-coding repeat genes, including ATXN8OS, RFC1, C9ORF72, NOTCH2NLC, BEAN1/TK2, and NOP56, using PCR-Sanger sequencing, repeat-primed PCR assay, and long-read sequencing.
RESULTS: Three patients with PD (1.5%) were found to have heterozygous repeat expansions in ATXN8OS, the gene causative of spinocerebellar ataxia type 8 and is associated with long non-coding RNA. One (0.5%) patient had compound heterozygous repeat expansions (AAGGG and ACAGG) in RFC1, the gene causative of cerebellar ataxia, neuropathy, and vestibular areflexia syndrome, which encodes a DNA repair protein. No patient had repeat expansions in C9ORF72, NOTCH2NLC, BEAN1/TK2, or NOP56. All patients with ATXN8OS repeat expansions exhibited typical parkinsonism with relatively rare subjective dysphagia, which was confirmed by videofluoroscopic results. Functional imaging, such as dopamine-transporter single photon emission computed tomography, showed abnormal findings in patients with non-coding repeat expansions.
DISCUSSION: Our findings revealed the importance of non-coding repeat expansions in Japanese patients with PD. This is the first study to show the positive result of non-coding repeat expansions in many patients with PD in Japan.
METHODS: We collected blood samples from 203 Japanese patients with PD and analyzed various non-coding repeat genes, including ATXN8OS, RFC1, C9ORF72, NOTCH2NLC, BEAN1/TK2, and NOP56, using PCR-Sanger sequencing, repeat-primed PCR assay, and long-read sequencing.
RESULTS: Three patients with PD (1.5%) were found to have heterozygous repeat expansions in ATXN8OS, the gene causative of spinocerebellar ataxia type 8 and is associated with long non-coding RNA. One (0.5%) patient had compound heterozygous repeat expansions (AAGGG and ACAGG) in RFC1, the gene causative of cerebellar ataxia, neuropathy, and vestibular areflexia syndrome, which encodes a DNA repair protein. No patient had repeat expansions in C9ORF72, NOTCH2NLC, BEAN1/TK2, or NOP56. All patients with ATXN8OS repeat expansions exhibited typical parkinsonism with relatively rare subjective dysphagia, which was confirmed by videofluoroscopic results. Functional imaging, such as dopamine-transporter single photon emission computed tomography, showed abnormal findings in patients with non-coding repeat expansions.
DISCUSSION: Our findings revealed the importance of non-coding repeat expansions in Japanese patients with PD. This is the first study to show the positive result of non-coding repeat expansions in many patients with PD in Japan.