Abstract
Polyclonal B cell leukemias have been generated in 17- to 20-day old Emu-myc transgenic rabbits. To analyze the repertoire of VH genes utilized in early B cells, eight VDJ genes were cloned from these leukemic cells. The nucleotide sequences of these genes indicated that seven of the eight VDJ genes encoded prototype VHa1, VHa2 or VHa3 allotypes. The two VDJ genes encoding VHa1 molecules had VH segments with identical nucleotide sequences; similarly, the VH segments of the four VDJ genes encoding VHa2 molecules were identical, with the exception of a single base pair. These data suggest that a limited repertoire of VH genes were utilized in the generation of these VDJ genes. The DH segments of these genes were limited to two DH families, D1 and D2, indicating that a restricted repertoire of DH genes also had been utilized. Since these leukemic cells probably developed early in ontogeny, we suggest that this restricted utilization of VH and DH genes is representative of B cells from developmentally immature rabbits.
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