Abstract
Studies with two closely related inbred chicken strains show that regression of Rous sarcoma virus-induced tumors is a dominantly inherited trait, controlled by a gene within, or closely linked to, the major histocompatibility complex (B region). Strain G-B2 birds are capable of regressing Rous tumors, while strain G-B1 birds are uniformly susceptible to progressive Rous tumor development. Evidence for crossing over between the genes controlling serologically determined MHC antigens on erythrocytes and genes controlling Rous sarcoma growth was obtained. The MHC-linked gene which confers the ability to regress Rous sarcomas is designatedR-Rs-1. The allelic gene which allows for progressive tumor growth in homozygous birds is designatedr-Rs-1.
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