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Epistasis between hyperglycemic QTLs revealed in a double congenic of the OLETF rat

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Abstract

Glucose homeostasis is believed to be regulated by multiple genetic components, in addition to numerous external factors. It is therefore crucial to dissect and understand what roles each causative gene plays in maintaining proper glucose metabolism. In OLETF (Otsuka Long-Evans Tokushima Fatty) rat, a model of polygenic type 2 diabetes, at least 14 quantitative trait loci (QTLs) influencing plasma glucose levels were identified. In congenic strains some of the OLETF allelic variants were shown to increase glucose levels. In this study the focus was on two of the hyperglycemic loci, Nidd1/of and Nidd2/of. Congenic rats possessing OLETF genome fragment at either locus showed similar levels of mild hyperglycemia. A newly established double congenic rat showed a further aggravation of hyperglycemia. The Nidd1/of locus was also shown to function in the reduction of plasma leptin levels and fat weights, while the Nidd2/of locus led to increased plasma insulin and fat weights. Interestingly, both plasma leptin and fat weights reverted to the control levels in the double congenic rat. These results indicate that there is an epistatic interaction between the two loci. However, it is unlikely that the abnormal level of enhanced glucose homeostasis is mediated, at least not directly, by leptin or fat mass.

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Acknowledgments

This study was supported in part by a grant from the National Bio Resource Project (NBRP) for the Rat in Japan (KM) and a grant from the Ministry of Education, Culture, Sports, Science & Technology of Japan (HK, KM). The authors thank Takako Koizumi for technical assistance in breeding congenic strains.

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Authors and Affiliations

  1. Division for Animal Research Resources, Institute of Health Biosciences, The University of Tokushima Graduate School, Kuramoto-cho, Tokushima, 770-8503, Japan

    Hiroyuki Kose & Kozo Matsumoto

  2. Department of Molecular and Environmental Pathology, Institute of Health Biosciences, The University of Tokushima Graduate School, Kuramoto-cho, Tokushima, 770-8503, Japan

    Yoshimi Bando & Keisuke Izumi

  3. Laboratory of Animal Breeding and Genetics, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan

    Takahisa Yamada

Authors
  1. Hiroyuki Kose
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  2. Yoshimi Bando
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  3. Keisuke Izumi
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  4. Takahisa Yamada
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  5. Kozo Matsumoto
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Correspondence to Kozo Matsumoto.

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Kose, H., Bando, Y., Izumi, K. et al. Epistasis between hyperglycemic QTLs revealed in a double congenic of the OLETF rat. Mamm Genome 18, 609–615 (2007). https://doi.org/10.1007/s00335-007-9031-7

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  • DOI: https://doi.org/10.1007/s00335-007-9031-7

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