Suppression of TLR9 immunostimulatory motifs in the genome of a gammaherpesvirus.

Suppression of TLR9 immunostimulatory motifs in the genome of a gammaherpesvirus.
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DOI:
10.4049/jimmunol.1003737
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发表时间:
2011-07-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Coscoy L
Coscoy L
中科院分区:
其他
文献类型:
--
作者:
Pezda AC;Penn A;Barton GM;Coscoy L

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先天免疫系统中的多个受体已经进化,将核酸识别为病毒感染的标志。人们认为这种特异性对于病毒检测是至关重要的,因为病毒通常缺乏其他不变的特征,可以作为合适的先天受体的靶标。TLR9是一种这样的先天受体,它与许多dsDNA病毒的检测有关。在本研究中,我们研究了用TLR9检测小鼠GHV 68(MHV68)的方法。我们发现,小鼠巨细胞病毒的基因组DNA是一种非常有效的先天反应诱导剂。对每种病毒基因组中存在的刺激和非刺激CpG基序数量的全基因组分析表明,MHV68基因组只包含小鼠CMV中存在的免疫刺激基序数量的一小部分。值得注意的是,MHV68似乎通过胞嘧啶到胸腺嘧啶的转换选择性地抑制了刺激基序的数量。这些数据表明,某些病毒可能已经进化和修改了它们的基因组内容,以避免被先天免疫系统的核酸传感受体识别。
Multiple receptors within the innate immune system have evolved to recognize nucleic acids as signatures of viral infection. It is believed that this specificity is essential for viral detection, as viruses often lack other invariant features that can serve as suitable targets for innate receptors. One such innate receptor, TLR9, has been implicated in the detection of many dsDNA viruses. In this study, we investigate the detection of murine gammaherpesvirus 68 (MHV68) by TLR9. We find that the genomic DNA of the murine CMV, a very potent inducer of innate responses. Genome-wide analysis of the number of stimulatory versus nonstimulatory CpG motifs present in the genome of each virus reveals that the MHV68 genome contains only a fraction of the number of immunostimulatory motifs present in murine CMV. Notably, MHV68 appears to have selectively suppressed the number of stimulatory motifs through cytosine to thymine conversion. These data suggest that certain viruses may have evolved and modified their genomic content to avoid recognition by nucleic acid-sensing receptors of the innate immune system.
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