Distribution of mutations around rearranged heavy-chain antibody variable-region genes

Distribution of mutations around rearranged heavy-chain antibody variable-region genes
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重排重链抗体可变区基因周围的突变分布

DOI:
10.1128/mcb.10.10.5187-5196.1990
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发表时间:
1990
影响因子:
5.3
通讯作者:
E. Steele
E. Steele
中科院分区:
生物学2区
文献类型:
--
作者:
G. Both;L. Taylor;J. Pollard;E. Steele

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哺乳动物B细胞中表达的免疫球蛋白基因可变区的体细胞高突变机制是免疫系统中产生多样性的主要原因不明的现象。为了评估可能的机制,检查了C57 BL/6 j小鼠中产生的一组5个克隆的、重排的体细胞突变的VH基因的体细胞突变的分布。对这些突变的VH基因进行测序,并从转录起始位点上游约550个碱基对的点到JH-4下游约1,200个碱基对的EcoRI位点与它们的种系对应物进行比较。转录起始(帽)位点的位置也被精确地确定。118个突变中的大多数(大于或等于94%)发生在转录起始位点和JH-4的远端之间。然而,7个突变发生在转录区上游,至少有4个在JH-4下游。因此,增变因子机制的靶区域明显延伸到3'非翻译区和5'非转录区。因此,提出DNA的转录区作为突变过程的唯一底物的模型并不排除,但不足以解释体细胞突变的上游分布。
The mechanism of somatic hypermutation in the variable region of immunoglobulin genes expressed in mammalian B cells is a major unexplained phenomenon in the generation of diversity in the immune system. To evaluate possible mechanisms, the distribution of somatic mutations was examined for a group of five cloned, rearranged, somatically mutated VH genes generated in C57BL/6j mice. These mutated VH genes were sequenced and compared with their germ line counterparts from a point approximately 550 base pairs upstream of the transcription start site to an EcoRI site some 1,200 base pairs downstream of JH-4. The location of the transcription start (cap) sites was also precisely determined. Most (greater than or equal to 94%) of the 118 mutations scored occurred between the transcription start site and the distal end of JH-4. However, seven mutations occurred upstream of the transcribed region, and at least four were found downstream of JH-4. The target region for the mutator mechanism therefore clearly extends into the 3' nontranslated and 5' nontranscribed regions. Thus, models which propose the transcribed region of the DNA as the sole substrate for the mutation process are not ruled out but are inadequate to explain the upstream distribution of somatic mutations.
DOI: 10.1073/pnas.86.23.9253
发表时间: 1989-12-01
影响因子: 11.1
作者:
KEOHAVONG, P;THILLY, WG
通讯作者: THILLY, WG
免疫球蛋白可变基因的体细胞突变模式。
DOI: 10.1093/genetics/115.1.169
发表时间: 1987
期刊: Genetics
影响因子: 3.3
作者:
Golding,GB;Gearhart,PJ;Glickman,BW
通讯作者: Glickman,BW
无启动子逆转录病毒载体表明 U3 中存在 3 RNA 加工所需的序列。
DOI: 10.1073/pnas.84.5.1197
发表时间: 1987
影响因子: 11.1
作者:
Dougherty,JP;Temin,HM
通讯作者: Temin,HM
基因转换可能是哺乳动物免疫球蛋白基因体细胞超突变的机制吗?
DOI: 10.1016/0168-9525(89)90004-8
发表时间: 1989
期刊: Trends in genetics : TIG
影响因子: --
作者:
Maizels,N
通讯作者: Maizels,N
DOI: 10.1073/pnas.81.9.2650
发表时间: 1984-01-01
期刊: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA-BIOLOGICAL SCIENCES
影响因子: --
作者:
PARSLOW, TG;BLAIR, DL;GRANNER, DK
通讯作者: GRANNER, DK