We studied the growth dynamics of Walker 256 carcinosarcoma in recombinant progeny of dihybrid crosses of Brattleboro and WAG rats. A mutation in the vasopressin gene determining hypothalamic diabetes insipidus was detected in Brattleboro rats. WAG rats are carriers of normal vasopressin gene. Another interlinear difference was linked to tyrosinase gene controlling melanin synthesis. WAG rats express mutant allele determining albino phenotype. Brattleboro rats had normal working tyrosinase gene. F2 segregation yielded phenotypic classes with two patterns of tumor growth: linear growth or regression. Tumors regression was not linked to tyrosinase activity and was observed only in rats with diabetes insipidus. Analysis of mutants in next generations F3 and F4 confirmed this regularity in the Walker 256 carcinosarcoma growth pattern.
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