...
首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Homozygous DNA ligase IV R278H mutation in mice leads to leaky SCID and represents a model for human LIG4 syndrome
【24h】

Homozygous DNA ligase IV R278H mutation in mice leads to leaky SCID and represents a model for human LIG4 syndrome

机译:小鼠中的纯合DNA连接酶IV R278H突变导致SCID泄漏,并代表人LIG4综合征的模型

获取原文
获取原文并翻译 | 示例
           

摘要

DNA ligase IV (LIG4) is an essential component of the nonhomol-ogous end-joining (NHEJ) repair pathway and plays a key role in V(D)J recombination. Hypomorphic LIG4 mutations in humans are associated with increased cellular radiosensitivity, microcephaly, facial dysmorphisms, growth retardation, developmental delay, and a variable degree of immunodeficiency. We have generated a knock-in mouse model with a homozygous Lig4 R278H mutation that corresponds to the first LIG4 mutation reported in humans. The phenotype of homozygous mutant mice Lig4~()R278H/R278H(Lig4~(R/R)) includes growth retardation, a decreased life span, a severe cellular sensitivity to ionizing radiation, and a very severe, but incomplete block in T and B cell development. Peripheral T lymphocytes show an activated and anergic phenotype, reduced viability, and a restricted repertoire, reminiscent of human leaky SCID. Genomic instability is associated with a high rate of thymic tumor development. Finally, Lig4~(R/R) mice spontaneously produce low-affinity antibodies that include autoreactive specificities, but are unable to mount high-affinity antibody responses. These findings highlight the importance of LIG4 in lymphocyte development and function, and in genomic stability maintenance, and provide a model for the complex phenotype of LIG4 syndrome in humans.
机译:DNA连接酶IV(LIG4)是非同源末端连接(NHEJ)修复途径的重要组成部分,在V(D)J重组中起关键作用。人类的亚型LIG4突变与细胞放射敏感性增加,小头畸形,面部畸形,生长迟缓,发育迟缓和免疫缺陷程度不同有关。我们已经生成了具有纯合的Lig4 R278H突变的敲入小鼠模型,该突变对应于人类报道的第一个LIG4突变。纯合突变小鼠Lig4〜()R278H / R278H(Lig4〜(R / R))的表型包括生长迟缓,寿命缩短,对电离辐射的细胞敏感性严重以及T和B细胞发育。外周T淋巴细胞表现出活化的和无反应的表型,降低的生存力,以及有限的库,让人想起人漏的SCID。基因组不稳定与胸腺肿瘤的高发生率有关。最后,Lig4(R / R)小鼠自发产生低亲和力抗体,该抗体具有自身反应特异性,但无法引发高亲和力抗体反应。这些发现突出了LIG4在淋巴细胞发育和功能中以及在基因组稳定性维持中的重要性,并为人类LIG4综合征的复杂表型提供了模型。

著录项

  • 来源
  • 作者单位

    Division of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnDivision of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rn'Angelo Nocivelli' Institute of Molecular Medicine, Department of Pediatrics, University of Brescia, Brescia 25123, Italy;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnDivision of Experimental Pathology,Department of Pathology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rnDepartment of Pathology, University of Brescia, Brescia 25123, Italy;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115;

    rnDivision of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnDivision of Immunology and Manton Center for Orphan Disease Research, Children's Hospital Boston, Boston, MA 02115;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rn'Angelo Nocivelli' Institute of Molecular Medicine, Department of Pediatrics, University of Brescia, Brescia 25123, Italy;

    Division of Immunology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

    rnImmune Disease Institute, Harvard Medical School, Boston, MA 02115;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    genomic instability; immunodeficiency; lymphocytes; nonhomologous end joining; immune dysregulation;

    机译:基因组不稳定免疫缺陷;淋巴细胞非同源末端连接;免疫失调;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号