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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Identification of IgF, a hinge-region-containing Ig class, and IgD in Xenopus tropicalis
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Identification of IgF, a hinge-region-containing Ig class, and IgD in Xenopus tropicalis

机译:热带爪蟾中IgF,含铰链区的Ig类和IgD的鉴定

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摘要

Only three Ig isotypes, IgM, IgX, and IgY, were previously known in amphibians. Here, we describe a heavy-chain isotype in Xenopus tropicalis, IgF (encoded by C-phi), with only two constant region domains. IgF is similar to amphibian IgY in sequence, but the gene contains a hinge exon, making it the earliest example, in evolution, of an Ig isotype with a separately encoded genetic hinge. We also characterized a gene for the heavy chain of IgD, located immediately 3' of C-mu, that shares features with the C-delta gene in fish and mammals. The latter gene contains eight constant-region-encoding exons and, unlike the chimeric splicing of mu C(H)1 onto the IgD heavy chain in teleost fish, it is expressed as a unique IgD heavy chain. The IgH locus of X. tropicalis shows a 5' V-H-D-H-J(H)-C-mu-C-delta-C-chi- C-upsilon-C-phi 3' organization, suggesting that the mammalian and amphibian Ig heavy-chain loci share a common ancestor.
机译:两栖动物以前只知道三种Ig同种型,即IgM,IgX和IgY。在这里,我们描述了热带非洲爪蟾的重链同种型,IgF(由C-phi编码),只有两个恒定区域。 IgF的序列与两栖类IgY相似,但是该基因包含一个铰链外显子,这使其在进化中成为具有单独编码的遗传铰链的Ig同种型的最早实例。我们还鉴定了IgD重链基因,位于C-mu的3'端,与鱼类和哺乳动物中的C-delta基因具有相同的功能。后一个基因包含八个恒定区编码外显子,与mu C(H)1在硬骨鱼的IgD重链上的嵌合剪接不同,它被表达为独特的IgD重链。热带假单胞菌的IgH基因座显示5'VHDHJ(H)-C-mu-C-delta-C-chi-C-upsilon-C-phi 3'组织,表明哺乳动物和两栖类Ig重链基因座共同祖先。

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