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Response to skin grafts exchanged among siblings of larval and adult gynogenetic diploids in Xenopus laevis.

Gynogenetic diploid individuals were produced in an anuran amphibian, Xenopus laevis, and their response to skin grafts exchanged among siblings was studied. All skin grafts exchanged among nongynogenetic sibling froglets, as well as those from genetically unrelated donors, were rejected within 30 days. More than half (57%) of the gynogens that received grafts from sibling partners exhibited a prolonged survival (over 30 days), including long-term survival of over 120 days in 13%. The skin grafted from genetically unrelated froglets onto Nieuwkoop and Faber stage 42-56 larvae and onto perimetamorphic stage 58-65 animals was rejected within 30 days. Similarly, most (96%) of the skin grafts from outbred sibling froglets onto larvae at these stages were rejected acutely or subacutely (12-39 days). However, the skin grafted from sibling froglets to gynogens at larval stage 42-56 and perimetamorphic stage 58-61 enjoyed a long-term survival significantly more frequently (81%) than that in the final metamorphic (stage 64-65) counterparts (57%). These results support the view that in the adult Xenopus allograft responses are reactions to a single MHC as well as to cumulative, multiple minor H-locus barriers. The results also suggest that in larval stages the responses against minor H-locus barriers are generated only mildly.