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The specific variable domain of camel heavy-chain antibodies is encoded in the germline

机译:骆驼重链抗体的特定可变域在种系中编码

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摘要

The variable domains of the functional heavy-chain antibodies (V(H)Hs) discovered in camels are related to the human V-H subgroup III They are nevertheless clearly distinguishable from the V(H)s of conventional fourchain immunoglobulins by the presence of important amino acid substitutions, located in the solvent-exposed surface normally covered by the variable domain of the light chain. The analysis of an unrearranged dromedary DNA Library revealed that the specific VHH gene with its characteristic amino acid substitutions is encoded in the germline. Therefore, it is concluded that the V(H)Hs do not arise through an ontogenic process of somatic hypermutation. The presence of putative DNA recombination signals that are more prevalent in the camel VHH, compared to the V-H germline gene, might play a role in the formation and efficient expansion of the VHH repertoire. (C) 1998 Academic Press Limited. [References: 44]
机译:骆驼中发现的功能性重链抗体(V(H)Hs)的可变域与人类VH亚组III有关。但是,由于存在重要的氨基,它们与传统的四链免疫球蛋白的V(H)明显不同。酸取代基,位于溶剂暴露的表面,通常被轻链可变域覆盖。对未重排单峰骆驼DNA库的分析表明,具有特征性氨基酸取代的特定VHH基因在种系中编码。因此,可以得出结论,V(H)Hs不是通过体细胞超突变的本体过程产生的。与V-H种系基因相比,在骆驼VHH中更普遍的推定DNA重组信号的存在可能在VHH组成部分的形成和有效扩展中起作用。 (C)1998 Academic Press Limited。 [参考:44]

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