No Association between (AAT)n Repeat Polymorphisms in the Cannabinoid Receptor 1 Gene and Smooth Pursuit Eye Movement Abnormality in Korean Patients with Schizophrenia

한국인 조현병 환자에서CNR1 유전자의 (AAT)n 삼핵산 반복 다형성과 안구추적운동 이상에 대한 연합 연구

  • Kim, Min Jae (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Kim, Chae-Ri (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Park, Jin Wan (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Pak, Doo Hyun (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Shin, Hyoung Doo (Department of Life Science, Sogang University) ;
  • Choi, Ihn-Geun (Department of Neuropsychiatry, Kangnam Sacred Heart Hospital, Hallym University College of Medicine) ;
  • Hahn, Sang Woo (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Hwang, Jaeuk (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Lee, Yeon Jung (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University) ;
  • Woo, Sung-Il (Department of Psychiatry, Soonchunhyang University Seoul Hospital, College of Medicine, Soonchunhyang University)
  • 김민재 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 김채리 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 박진완 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 백두현 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 신형두 (서강대학교 생명공학과) ;
  • 최인근 (한림대학교 의과대학 강남성심병원 정신건강의학교실) ;
  • 한상우 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 황재욱 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 이연정 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,) ;
  • 우성일 (순천향대학교 의과대학 순천향대학교병원 정신건강의학교실,)
  • Received : 2016.07.05
  • Accepted : 2016.08.04
  • Published : 2016.11.30

Abstract

Objectives According to previous studies, the cannabinoid receptor 1 (CNR1) gene could be an important candidate gene for schizophrenia. Some studies have linked the (AAT)n trinucleotide repeat polymorphism in CNR1 gene with the risk of schizophrenia. Meanwhile, smooth pursuit eye movement (SPEM) has been regarded as one of the most consistent endophenotypes of schizophrenia. In this study, we investigated the association between the (AAT)n trinucleotide repeats in CNR1 gene and SPEM abnormality in Korean patients with schizophrenia. Methods We measured SPEM function in 167 Korean patients with schizophrenia (84 male, 83 female) and they were divided according to SPEM function into two groups, good and poor SPEM function groups. We also investigated allele frequencies of (AAT)n repeat polymorphisms on CNR1 gene in each group. A logistic regression analysis was performed to find the association between SPEM abnormality and the number of (AAT)n trinucleotide repeats. Results The natural logarithm value of signal/noise ratio (Ln S/N ratio) of the good SPEM function group was $4.34{\pm}0.29$ and that of the poor SPEM function group was $3.21{\pm}0.70$. In total, 7 types of trinucleotide repeats were identified, each containing 7, 10, 11, 12, 13, 14, and 15 repeats, respectively. In the patients with $(AAT)7$ allele, the distributions of the good and poor SPEM function groups were 18 (11.1%) and 19 (11.0%) respectively. In the patients with $(AAT)_{10}$ allele, $(AAT)_{11}$ allele, $(AAT)_{12}$ allele, $(AAT)_{13}$ allele, $(AAT)_{14}$ allele and $(AAT)_{15}$ allele, the distributions of good and poor SPEM function groups were 13 (8.0%) and 12 (7.0%), 4 (2.5%) and 6 (3.5%), 31 (19.8%) and 35 (20.3%), 51 (31.5%) and 51 (29.7%), 36 (22.2%) and 45 (26.2%), 9 (5.6%) and 4 (2.3%) respectively. As the number of (AAT) n repeat increased, there was no aggravation of abnormality of SPEM function. Conclusions There was no significant aggravation of SPEM abnormality along with the increase of number of (AAT)n trinucleotide repeats in the CNR1 gene in Korean patients with schizophrenia.

Keywords

References

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