The spectrum of acridine resistant mutants of bacteriophage T4 reveals cryptic effects of the tsL141 DNA polymerase allele on spontaneous mutagenesis.
The spectrum of acridine resistant mutants of bacteriophage T4 reveals cryptic effects of the tsL141 DNA polymerase allele on spontaneous mutagenesis.
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噬菌体 T4 的吖啶抗性突变体谱揭示了 tsL141 DNA 聚合酶等位基因对自发诱变的神秘影响。
DOI:
10.1093/genetics/148.4.1655
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发表时间:
1998
期刊:
影响因子:
3.3
通讯作者:
Ripley,LS
中科院分区:
文献类型:
--
作者:
Wang,FJ;Ripley,LS
Mutations in the ac gene of bacteriophage T4 confer resistance to acridine-inhibition of phage development. Previous studies had localized the ac gene region; we show that inactivation of T4 Open Reading Frame 52.2 confers the Acrphenotype. Thus, 52.2 is ac. The resistance mechanism is unknown. The ac gene provides a convenient forward mutagenesis assay. Its compact size (156 bp) simplifies mutant sequencing and diverse mutant types are found: base substitutions leading to missense or nonsense codons, inframe deletions or duplications within the coding sequence, deletion or duplication frameshifts, insertions, complex mutations, and large deletions extending into neighboring sequences. Comparisons of spontaneous mutagenesis between phages bearing the wild-type or tsL141 alleles of DNA polymerase demonstrate that the impact of the mutant polymerase is cryptic when total spontaneous mutant frequencies are compared, but the DNA sequences of the ac mutants reveal a substantial alteration of fidelity by the mutant polymerase. The patterns of base substitution mutagenesis suggest that some site-specific mutation rate effects may reflect hotspots for mutagenesis arising by different mechanisms. A new class of spontaneous duplication mutations, having sequences inconsistent with misaligned pairing models, but consistent with nick-processing errors, has been identified at a hotspot in ac.
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影响因子:
5.6
作者:
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通讯作者:
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影响因子:
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DOI:
10.1016/s0021-9258(17)42371-4
发表时间:
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期刊:
The Journal of biological chemistry
影响因子:
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影响因子:
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作者:
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通讯作者:
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