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During selection for protein content in mice at the Technical University of Berlin, individuals showing high protein content and a compact exterior were noted. Animals showing this "Compact" phenotype were separated to form a new line. The present investigations were carried out on a Hungarian subpopulation of this line, selected for maximum expression of the Compact phenotype, and apparently at fixation for the relevant genes. Fertility and viability of the Compact subpopulation was normal. As compared to normal mice, carcass percentage values for male and female Compact mice were 9.4 and 6.8% greater, respectively; and the muscle:bone weight ratio in males was 1.61-fold greater. The Compact phenotype showed variable expressivity and was of intermediate dominance in males, but almost fully recessive in females. The hypothesis that a single gene is solely responsible for the Compact phenotype was rejected by maximum likelihood analysis. Linkage mapping using selective DNA pooling located a single locus (denoted Cmpt) strongly associated with the Compact phenotype on mouse chromosome 1. Fine mapping, using individual selective genotyping and haplotype analysis, located Cmpt to the region between D1Mit375 and D1Mit21, approximately one third of the way to D1Mit21.

Inheritance and Mapping of Compact (Cmpt), a New Mutation Causing Hypermuscularity in Mice