Monoclonal Antibodies Against Chicken Bu-la and Bu-lb Alloantigens

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Abstract
The production and characterization of monoclonal antibodies (mAbs) against chicken B cell surface alloantigens, Bu-la and Bu-lb, is described. Flow cytometric analysis using these mAbs demonstrates that Bu-l gene locus does not show allelic exclusion. Two color fluorescence analysis using simultaneous surface marker labeling and DNA staining shows that the expression of Bu-l antigen is not restricted to a specific phase of the cell cycle. Earlier findings that Bu-l locus is not linked to the MHC locus are confirmed. Furthermore, data is presented that Bu-l antigen expression is not entirely B cell restricted. Apparently a fraction of larger mononuclear cells with typical light scatter characteristics in flow cytometry also bear this marker. MAbs against both allelic Bu-l antigens are beneficial tools e.g., in typing of chicken lines and in studies on chicken lines and studies on chicken B cell differentiation.