The role of germline promoters and I exons in cytokine-induced gene-specific class switch recombination.

The role of germline promoters and I exons in cytokine-induced gene-specific class switch recombination.
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DOI:
10.4049/jimmunol.1003108
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发表时间:
2011-01-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Collins JT
Collins JT
中科院分区:
其他
文献类型:
--
作者:
Dunnick WA;Shi J;Holden V;Fontaine C;Collins JT

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生殖系转录先于类开关重组。这些生殖系转录物的启动子区域和I外显子包括激活和细胞因子诱导的转录因子的结合位点,并且启动子区域/I外显子对于类开关重组是必不可少的。因此,这是一个强有力的假设,即启动子/I外显子区域负责大部分细胞因子调控的、基因特异性的类开关重组。我们通过用整个H链C区基因座的转基因中的小鼠γ1和γ2a H链基因替换生殖系启动子和I外显子来检验这一假设。我们发现,γ-1生殖系转录产物的启动子/I外显子可以将IL-4诱导的重组导向γ2a基因。另一方面,γ2a生殖系转录物的启动子/I外显子在γ1 H链基因的背景下工作不佳,导致γ1 H链的表达不到野生型的1%。而干扰素-γ-γ可诱导少量的嵌合基因重组。这些结果表明,CSR的细胞因子调节,而不是CSR的大小,是由启动子/I外显子调节的。
Germline transcription precedes class switch recombination. The promoter regions and I exons of these germline transcripts include binding site for activation- and cytokine-induced transcription factors, and the promoter regions/I exons are essential for class switch recombination. Therefore, it is a strong hypothesis that the promoter/I exons regions are responsible for much of cytokine-regulated, gene-specific class switch recombination. We tested this hypothesis by swapping the germline promoter and I exons for the murine γ1 and γ2a H chain genes in a transgene of the entire H chain C region locus. We found that the promoter/I exon for γ1 germline transcripts can direct robust IL-4-induced recombination to the γ2a gene. On the other hand, the promoter/I exon for the γ2a germline transcripts works poorly in the context of the γ1 H chain gene, resulting in expression of γ1 H chains that is less than 1% the wild type level. Nevertheless, the small amount of recombination to the chimeric γ1 gene is induced by IFN-γ. These results suggest that cytokine regulation of CSR, but not the magnitude of CSR, is regulated by the promoter/I exons.
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