Abstract
We describe the transmission of an introduced minichromosome of brook trout (Salvelinus fontinalis) origin, carrying a pigmentation gene, through three generations in rainbow trout (Oncorhynchus mykiss). The minichromosome was originally introduced into gynogenetic albino rainbow trout using gamma-irradiated brook trout sperm. In the third generation, the presence of the minichromosome was correlated with pigmentation. A brook trout specific interspersed repeat DNA sequence, Fok I, was also correlated with pigmentation in these individuals. This system, the first clearly documented example of induced chromosome mediated gene transfer at the organismal level, could have applications in studies of gene mapping, development, gene regulation, and chromosome function.
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