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有读书笔记有附件Expression of IgM, IgD, and IgY in a reptile, Anolis carolinensis

3 聚焦生物 添加于 2009-9-11 03:38 | 1895 次阅读 | 2 个评论
  •  作 者

    Wei Z, Wu Q, Ren L, Hu X, Guo Y, Warr GW, Hammarstrom L, Li N, Zhao Y
  •  摘 要

    The reptiles are the last major group of jawed vertebrates in which the organization of the IGH locus and its encoded Ig H chain isotypes have not been well characterized. In this study, we show that the green anole lizard (Anolis carolinensis) expresses three Ig H chain isotypes (IgM, IgD, and IgY) but no IgA. The presence of the delta gene in the lizard demonstrates an evolutionary continuity of IgD from fishes to mammals. Although the germline delta gene contains 11 C(H) exons, only the first 4 are used in the expressed IgD membrane-bound form. The mu chain lacks the cysteine in C(H)1 that forms a disulfide bond between H and L chains, suggesting that (as in IgM of some amphibians) the H and L polypeptide chains are not covalently associated. Although conventional IgM transcripts (four C(H) domains) encoding both secreted and membrane-bound forms were detected, alternatively spliced transcripts encoding a short membrane-bound form were also observed and shown to lack the first two C(H) domains (VDJ-C(H)3-C(H)4-transmembrane region). Similar to duck IgY, lizard IgY H chain (upsilon) transcripts encoding both full-length and truncated (IgYDeltaFc) forms (with two C(H) domains) were observed. The absence of an IgA-encoding gene in the lizard IGH locus suggests a complex evolutionary history for IgA in the saurian lineage leading to modern birds, lizards, and their relatives.
  •  详细资料

    • 文献种类:期刊
    • 期刊名称: Journal of Immunology (Baltimore, Md. : 1950)
    • 期刊缩写: J Immunol
    • 期卷页: 2009  183 6 3858-3864
    • 地址: State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, Peoples Republic of China
    • ISBN: 1550-6606
    • 备注:PMID:19717516
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    鸭嘴兽中发现新免疫球蛋白类型

    日前,中国农业大学生物学院赵要风教授、李宁院士在9月份出版的两期免疫学杂志(the Journal of Immunology)上连续发表文章探讨动物免疫球蛋白基因的进化问题。

    通过与澳大利亚、瑞典科学家以及云南大学张亚平院士研究组、本校生物学院张子丁教授的合作,两位教授研究小组在一种原始哺乳动物鸭嘴兽中发现了一种新的免疫球蛋白类型并命名为IgO(the Journal of Immunology,2009,183(5):3285-93)。IgO是近几十年来在哺乳动物中发现的除IgM,IgD,IgG,IgA和IgE外的唯一新类型,它包括四个固定区结构域和一个铰链区结构,在结构表现为低等动物IgY与哺乳动物IgG的中间体形式而且与两者均具有基因序列同源性,明确证明了哺乳动物IgG来源于低等动物的IgY。同时他们发现鸭嘴兽IgD(包含10个固定区结构域,无铰链区)与高等哺乳动物IgD结构(2到3个固定区结构域和一段铰链区)上具有显著差异,但与鱼类、两栖类和爬行类IgD结构上相同。这些结果表明作为最原始的哺乳动物,鸭嘴兽免疫球蛋白基因同时混合了高等哺乳动物与低等脊椎动物的特征。

    在另外一项研究中(the Journal of Immunology,2009,183(6):3858-64),两位教授与瑞典及美国研究人员合作对爬行类动物绿安蜥的免疫球蛋白基因进行了详细研究,发现这类爬行类动物中缺乏负责黏膜免疫的IgA基因。

    两位教授在免疫球蛋白基因方面的研究对了解基因在脊椎动物中的进化提供了有意义的线索。

    在读博士研究生崔慧婷、位治国和吴钎分别是两篇论文的第一或并列第一作者。这两项研究得到了国家杰出青年科学基金及自然科学基金的支持。

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