The present study did not provide evidence for the association between these …

• Abstract
• Background
• Subjects and Methods
• Results
• Discussion
• Conclusion
• References
• Table

We provided no evidence for association between the there dopamine-related genes, DRD2, DRD3, and TH, and personality traits in Japanese subjects.

Competing interests

The author(s) declare that they have no competing interests.

Authors' contributions

HH and TO carried out recruitment of the subjects and the genetic studies. MT performed statistical analyses and drafted the manuscript. TS participated in the design of the study and helped to draft the manuscript. NK conceived of the study and participated in its design. All authors read and approved the final manuscript.

Acknowledgements

The authors thank Mr. Fumitaka Sakurai and Ms Mayuko Hara for technical help. This study was supported by a funding from the Ministry of Education, Culture, Sports, Science and Technology of Japan.