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Fine mapping of a murine growth locus to a 1.4-cM region and resolution of linked QTL

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Abstract

Previous work identified a QTL affecting murine size (particularly tail length) in a cross between C57BL/6J and DBA/2J mice and refined its location to an 8-cM region between D1Mit30 and D1Mit57. The present study used recombinant progeny testing to fine map this QTL. Individuals from a partially congenic strain carrying chromosomes recombinant between D1Mit30 and D1Mit57 were mated to DBA/2J, generating 942 progeny. Two QTL affecting 10-week tail length were identified in this population: one at 9.7 cM distal to D1Mit30 (the position estimated in previous work), and another of smaller effect near D1Mit30. A second population (n = 787) was generated by mating siblings from the progeny test population that were heterozygous for the same segment of chromosome, including only recombinants between D1Mit265 and D1Mit57. In the latter population, two QTL were also identified: one at 10.2 cM distal to D1Mit30, and another of smaller effect at the distal end of the mapped region (at D1Mit150). When the two populations were analyzed together, the estimated location of the central QTL was 10.2 cM distal to D1Mit30 and there was marginally significant evidence of the distal QTL. The central QTL explained approximately 7% of the phenotypic variance, and the 95% confidence interval for its position (determined by bootstrapping) was a 1.4-cM region, approximately the region from D1Mit451 to D1Mit219. The central QTL also affected tail length and body mass at 3 and 6 weeks of age, but to a lesser degree than 10-week tail length.

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Acknowledgments

We thank Fiona Oliver for help with the maintenance of the mice, Zoë Hodgson for assistance with the statistical analyses and two anonymous referees for helpful comments. We acknowledge the Biotechnology and Biological Research Council (U.K.) and the Natural Sciences and Engineering Research Council of Canada for financial support.

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  1. Institute of Cell, Animal and Population Biology, University of Edinburgh, Ashworth Laboratories, King’s Buildings, West Mains Road, Edinburgh, EH9 3JT, UK

    Julian K. Christians & Peter D. Keightley

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  1. Julian K. Christians
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  2. Peter D. Keightley
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Correspondence to Julian K. Christians.

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Christians, J.K., Keightley, P.D. Fine mapping of a murine growth locus to a 1.4-cM region and resolution of linked QTL. Mamm Genome 15, 482–491 (2004). https://doi.org/10.1007/s00335-004-3046-0

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  • DOI: https://doi.org/10.1007/s00335-004-3046-0

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