Mapping a Syntenic Modifier on Mouse Chromosome 1 Influencing the Expressivity of the Compact Phenotype in the Myostatin Mutant (MstnCmpt-dl1Abc) Compact Mouse

A novel method for mapping a modifier gene that is syntenic to its major gene was used to map a male-sex-limited modifier of the expressivity of the Compact phenotype in the myostatin mutant (MstnCmpt-dl1Abc) Compact mouse. The modifier was mapped to the general region of D1Mit262, 40 cM distal to Mstn on chromosome 1. Myogenin, a postulated downstream target of myostatin, maps to the same region.