Disclosed are DNA sequences which code for antigenic proteins, methods for indentifying such DNA sequences, and antigens coded for by such DNA sequences.
The first step of the method is to provide a multiplicity of DNA sequences. These sequences are then inserted into DNA expression vectors to form recombinant expression vectors. The expression vectors are inserted into suitable hosts to form transformants which express the DNA sequences. The transformants are then contacted to antibodies directed against Eimeria antigens to identify transformants containing DNA sequences which code for Eimeria antigens. These antigens are then produced from the DNA sequences identified as coding for the antigens. The antigens so produced are contacted to white blood cells which effect a cell-mediated immune response, which white blood cells are sensitized to an antigenic Eimeria protein, to thereby identify DNA sequences which code for antigens that induce a cell-mediated immune response to avian coccidiosis.
The DNA sequences of the present invention comprise cloned genes or fragments thereof that code on expression for antigenic protein that activates white blood cells which effect a cell-mediated immune response, which white blood cells are sensitized to an antigenic Eimeria protein.
本发明公开了编码抗原蛋白的 DNA 序列、识别这种 DNA 序列的方法以及这种 DNA 序列编码的抗原。
该方法的第一步是提供多种 DNA 序列。然后将这些序列插入 DNA 表达载体,形成
重组表达载体。将表达载体插入合适的宿主体内,形成表达 DNA 序列的转化体。然后将转化体与针对艾美耳抗原的
抗体接触,以鉴定含有编码艾美耳抗原的 DNA 序列的转化体。这些抗原随后从被鉴定为编码抗原的 DNA 序列中产生。这样产生的抗原与白细胞接触,产生细胞介导的免疫反应,白细胞对抗原性艾美耳病蛋白敏感,从而鉴定出编码抗原的 DNA 序列,这些抗原可诱导对禽类球虫病的细胞介导的免疫反应。
本发明的 DNA 序列包括克隆
基因或其片段,这些
基因或片段在表达时编码能激活白细胞的抗原蛋白,从而产生细胞介导的免疫反应,这些白细胞对抗原性艾美耳病蛋白敏感。