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A growth QTL (Pbwg1) region of mouse chromosome 2 contains closely linked loci affecting growth and body composition

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Abstract

Previous QTL studies have identified 24 QTLs for body weight and growth from 3 to 10 weeks after birth in an intersubspecific backcross mouse population between C57BL/6J and wild Mus musculus castaneus that has 60% of the body size of C57BL/6J. The castaneus allele at the most potent QTL (Pbwg1) on proximal chromosome 2 retards growth. In this study we have developed a congenic strain with a 44.1-Mb interval containing the castaneus allele at Pbwg1 by recurrent backcrossing to C57BL/6J. The congenic mouse developed was characterized by significantly higher body weight gain between 1 and 3 weeks of age and lower weight of white fat pads at 10 weeks of age than C57BL/6J. However, no clear difference in body weight at 1–10 weeks of age was observed between congenic and C57BL/6J strains. QTL analysis with 269 F2 mice between the two strains did not identify any QTLs for body weight at 1, 3, 6, and 10 weeks of age, but it discovered eight closely linked QTLs affecting body weight gain from 1 to 3 weeks of age, lean body weight, weight of white fat pads, and body length within the Pbwg1 region. The castaneus alleles at all fat pad QTLs reduced the phenotypes, whereas at the remaining growth and body composition QTLs, they increased the trait values. These results illustrate that Pbwg1, which initially appeared to be a single locus, was resolved into several loci with opposite effects on the composition traits of overall body weight. This gives a reason for the loss of the Pbwg1 effect found in the original backcross population.

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Acknowledgments

The authors thank H. Kodama and T. Tanahashi for assistance with the animal care and genotyping. This work was supported by Grant-in-Aides for Scientific Research from the Japan Society for the Promotion of Science (Nos. 14560233 and 16380186) to A. Ishikawa.

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Authors and Affiliations

  1. Laboratory of Animal Genetics, Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya, Aichi, 464-8601, Japan

    Akira Ishikawa, Eun-Hee Kim, Hasbaira Bolor, Md. Bazlur R. Mollah & Takao Namikawa

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  1. Akira Ishikawa
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  2. Eun-Hee Kim
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  3. Hasbaira Bolor
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  4. Md. Bazlur R. Mollah
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  5. Takao Namikawa
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Correspondence to Akira Ishikawa.

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Ishikawa, A., Kim, EH., Bolor, H. et al. A growth QTL (Pbwg1) region of mouse chromosome 2 contains closely linked loci affecting growth and body composition. Mamm Genome 18, 229–239 (2007). https://doi.org/10.1007/s00335-007-9009-5

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  • DOI: https://doi.org/10.1007/s00335-007-9009-5

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