Ig V region hypermutation in B cell hybrids mimics in vivo mutation and allows for isolation of clonal variants.

Ig V region hypermutation in B cell hybrids mimics in vivo mutation and allows for isolation of clonal variants.
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B 细胞杂交体中的 Ig V 区超突变模拟体内突变,并允许分离克隆变体。

DOI:
10.1016/s0161-5890(97)00131-4
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发表时间:
1997
影响因子:
3.6
通讯作者:
Scharft,MD
Scharft,MD
中科院分区:
医学3区
文献类型:
--
作者:
Green,NS;Verdugo,G;Getman,ME;Scharft,MD

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参考文献

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为了研究IG超突变的调控,我们建立了一个细胞培养系统,其中稳定转染的IG基因中V区终止密码子的逆转允许通过波动分析定量突变率。与μ恒定区相关的转染重链V区在NSO浆细胞瘤细胞系中突变率较低,在18.81前B细胞系中突变率中等。通过融合这两种细胞系产生的大多数杂交体类似于非允许的NSO细胞系,尽管少数杂交体具有甚至高于18.81的组成型V区突变率,并且类似于体内发生的高突变率(绿色,N.美国,Rabinowitz,J. L.,Zhu,M.,中国科学院院士,科布林、B。J.和Scharff,M. D.等人(1995)Proc. Sci.(USA)92,6304-6308)。这些杂交体的表征现在证明转染的基因整合在IG基因座之外。突变是由于在V区而不是C区的多个单碱基对替换,是持续的,并且经常出现在体内V区超突变所描述的热点基序中。亚克隆的不稳定的杂交允许分离的高度相关的克隆与44-70倍不同的突变率。这些结果表明,在体外系统中,这种模式下的V区超突变受到正向和负向调节。
In order to investigate the regulation of Ig hypermutation, we have established a cell culture system in which reversion of a V region stop codon in a stably transfected Ig gene permits the quantitation of mutation rates by fluctuation analysis. Transfected heavy chain V regions associated with the μ constant region undergo low rates of mutation in the NSO plasmacytoma cell line and a moderate rate of mutation in the 18.81 pre-B cell line. Most of the hybrids created by fusing these two cell lines resembled the non-permissive NSO cell line, though a few hybrids had constitutive V region mutation rates that were even higher than 18.81 and similar to the high rates of mutation that occur in vivo (Green, N. S., Rabinowitz, J. L., Zhu, M., Kobrin, B. J. and Scharff, M. D. (1995) Proc. Nat. Acad. Sci. (USA)92, 6304–6308). Characterization of these hybrids now demonstrates that the transfected genes were integrated outside of the Ig locus. Mutation was due to multiple single base pair replacements in the V region and not the C region, was ongoing and often arose in hot spot motifs described by V region hypermutation in vivo. Subcloning of unstable hybrids allowed for the isolation of highly related clones with 44–70-fold different mutation rates. These results suggest that V region hypermutation in this mode in vitro systems is under both positive and negative regulation.
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