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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >An evolutionarily mobile antigen receptor variable region gene: Doubly rearranging NAR-TcR genes in sharks
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An evolutionarily mobile antigen receptor variable region gene: Doubly rearranging NAR-TcR genes in sharks

机译:进化移动抗原受体可变区基因:鲨鱼中的NAR-TcR基因双重重排

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摘要

Distinctive Ig and T cell receptor (TcR) chains define the two major lineages of vertebrate lymphocyte yet similarly recognize antigen with a single, membrane-distal variable (V) domain. Here we describe the first antigen receptor chain that employs two V domains, which are generated by separate VDJ gene rearrangement events. These molecules have specialized "supportive" TcR delta V domains membrane-proximal to domains with most similarity to IgNAR V. The ancestral NAR V gene encoding this domain is hypothesized to have recombined with the TRD locus in a cartilaginous fish ancestor > 200 million years ago and encodes the first V domain shown to be used in both Igs and TcRs. Furthermore, these data support the view that gamma/delta TcRs have for long used structural conformations recognizing free antigen.
机译:独特的Ig和T细胞受体(TcR)链定义了脊椎动物淋巴细胞的两个主要谱系,但同样识别具有单个膜远侧可变(V)域的抗原。在这里,我们描述了使用两个V域的第一条抗原受体链,这两个V域是由单独的VDJ基因重排事件产生的。这些分子在膜上最接近与IgNAR V最相似的结构域,有专门的“支持性” TcR delta V结构域。据推测,编码该结构域的祖先NAR V基因已与距今2亿年前的软骨鱼类祖先的TRD基因座重组。并对显示在Ig和TcR中使用的第一个V域进行编码。此外,这些数据支持了这样的观点,即γ/δTcR具有长期使用的识别游离抗原的结构构象。

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