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Non-coding repeat expansions in genes like ATXN8OS and RFC1 are linked to Parkinson's disease (PD) in Japanese patients. This study highlights their genetic contribution to PD in Japan.

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Area of Science:

  • Genetics
  • Neurodegenerative Diseases
  • Parkinson's Disease Etiology

Background:

  • Parkinson's disease (PD) has a complex genetic basis, with mutations accounting for familial forms.
  • Pathological repeat expansions in non-coding regions are increasingly recognized in neurodegenerative diseases.
  • The role of these expansions in Japanese PD patients remained largely unexplored.

Purpose of the Study:

  • To investigate the genetic background of non-coding repeat expansions in Japanese individuals diagnosed with Parkinson's disease.
  • To identify specific genes associated with repeat expansions and their prevalence in this cohort.

Main Methods:

  • Blood samples from 203 Japanese PD patients were analyzed.
  • Targeted analysis of non-coding repeat genes including ATXN8OS, RFC1, C9ORF72, NOTCH2NLC, BEAN1/TK2, and NOP56.
  • Utilized PCR-Sanger sequencing, repeat-primed PCR, and long-read sequencing techniques.

Main Results:

  • 1.5% of patients (3/203) exhibited heterozygous ATXN8OS repeat expansions.
  • 0.5% of patients (1/203) showed compound heterozygous RFC1 repeat expansions.
  • No repeat expansions were detected in C9ORF72, NOTCH2NLC, BEAN1/TK2, or NOP56. Patients with ATXN8OS expansions presented typical parkinsonism and abnormal dopamine-transporter imaging findings.

Conclusions:

  • Non-coding repeat expansions, particularly in ATXN8OS and RFC1, are a relevant genetic factor in Japanese Parkinson's disease patients.
  • This study provides the first evidence of positive findings for non-coding repeat expansions in a significant number of PD patients in Japan.
  • These genetic findings contribute to understanding the diverse etiology of Parkinson's disease.