Ig gene somatic hypermutation in mice defective for DNA polymerase delta proofreading.

Ig gene somatic hypermutation in mice defective for DNA polymerase delta proofreading.
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DNA 聚合酶 delta 校对缺陷的小鼠中 Ig 基因体细胞超突变。

DOI:
10.1093/intimm/dxg047
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发表时间:
2003
影响因子:
4.4
通讯作者:
Storb,Ursula
Storb,Ursula
中科院分区:
医学3区
文献类型:
--
作者:
Longacre,Angelika;Sun,Tianhe;Goldsby,RobertE;Preston,BradleyD;Storb,Ursula

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本研究旨在探讨DNA聚合酶(pol) δ与失活外切酶(exo)在体细胞超突变(SHM)中的可能作用。内源性重链转录本分析显示,exo - / -、exo+/和exo+/+小鼠之间的突变频率和模式没有差异。pol δ外显子突变对SHM缺乏影响可能是由于:(i)通常在SHM中使用pol δ,但外显子被阻止校对;(ii)通常使用pol δ,但外显子pol保真度的降低并未增加足以检测到的高突变频率;(iii) pol δ未在SHM中使用。基于在exo - / -小鼠中的发现和目前对SHM过程的理解,我们得出结论,pol δ通常不参与突变的产生。本研究中获得的大多数突变序列,包括许多来自外显子/外显子小鼠的突变序列,来自已转换为γ重链类的基因。因此,类切换重组(CSR)不需要pol δ校对活动。用不同Ig类的多个突变序列观察到的谱系树显示,CSR和SHM在细胞克隆扩增过程中混合发生,这提高了它们可能同时发生的可能性。
This study is an investigation of the possible role of DNA polymerase (pol) δ with an inactivated exonuclease (exo) in somatic hypermutation (SHM). Analysis of endogenous heavy chain transcripts revealed no difference in mutation frequency and pattern between exo–/–, exo+/–and exo+/+mice. The lack of an effect of the pol δ exo mutation on SHM could be due to: (i) normally pol δ is used in SHM, but the exo is prevented from proofreading, (ii) normally pol δ is used, but the decrease in fidelity of the exo–pol does not increase hypermutation frequency enough to be detected, and (iii) pol δ is not used in SHM. Based on the finding in the exo–/–mice and the current understanding of the process of SHM, it is concluded that pol δ is not normally involved in creating the mutations. The majority of the mutated sequences obtained in this study, including many from the exo–/–mice, were from genes which had switched to a γ heavy chain class. Thus, the pol δ proofreading activity is not required for class switch recombination (CSR). Genealogical trees observed with multiple mutated sequences of various Ig classes show that CSR and SHM occur intermingled during expansion of a cell clone, raising the possibility that they may occur at the same time.
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