- Mutation in bombesin receptor subtype-3 gene is not a major cause of obesity in the Japanese. Hotta, K., Matsukawa, Y., Nishida, M., Kotani, K., Takahashi, M., Kuriyama, H., Nakamura, T., Wada, K., Yamashita, S., Funahashi, T., Matsuzawa, Y. Horm. Metab. Res. (2000)