Abstract:
:We have previously reported the isolation of mammalian cell lines expressing the 3-methyladenine DNA glycosylase I (tag) gene from E. coli. These cells are 2-5 fold more resistant to the toxic effects of methylating agents than normal cells (15). Kinetic measurements of 3-methyladenine removal from the genome in situ show a moderate (3-fold) increase in Tag expressing cells relative to normal as compared to a high (50-fold) increase in exogenous alkylated DNA in vitro by cell extracts. Excision of 7-methylguanine is as expected, unaffected by the tag+ gene expression. The frequency of mutations formed in the hypoxanthine phosphoribosyl transferase (hprt) locus was investigated after methylmethanesulfonate (MMS), ethylmethanesulfonate (EMS), N-nitroso-N-methylurea (NMU) and N-nitroso-N-ethylurea (NEU) exposure. Tag expression reduced the frequency of MMS and EMS induced mutations to about half the normal rate, whereas the mutation frequency in cells exposed to NMU or NEU is not affected by the tag+ gene expression. These results indicate that after exposure to compounds which produce predominantly N-alkylations in DNA, a substantial proportion of the mutations induced is formed at 3-alkyladenine residues in DNA.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Klungland A,Bjørås M,Hoff E,Seeberg Edoi
10.1093/nar/22.9.1670subject
Has Abstractpub_date
1994-05-11 00:00:00pages
1670-4issue
9eissn
0305-1048issn
1362-4962journal_volume
22pub_type
杂志文章abstract::The cDNA encoding Chinese hamster O6-alkylguanine-DNA-alkyltransferase (ATase) has been isolated from a library prepared from RNA isolated from V79 lung fibroblasts which had an upregulated level of this repair activity following stepwise selection with a chloroethylating agent (1, 2). Expression of the cDNA in E. col...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/20.8.1891
更新日期:1992-04-25 00:00:00
abstract::For characterizing in vivo functions of a mammalian protein, it is informative to obtain conditional mutations and apply them to the mouse genetic system. However, the isolation of conditional mutations has been quite difficult in cultured cells. We report here that functional expression of a heterologous mammalian ge...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/22.20.4229
更新日期:1994-10-11 00:00:00
abstract::Molecular Biology Database List (MBDL) includes brief descriptions and pointers to Web sites for the various databases described in this issue as well as other Web sites presenting data sets relevant to molecular biology. This information is compiled into a list (http://www.oup.co.uk/nar/Volume_27/Issue_01/summary/ gk...
journal_title:Nucleic acids research
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更新日期:1999-01-01 00:00:00
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journal_title:Nucleic acids research
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doi:10.1093/nar/gky247
更新日期:2018-07-06 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/11.21.7537
更新日期:1983-11-11 00:00:00
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journal_title:Nucleic acids research
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doi:10.1093/nar/11.19.6611
更新日期:1983-10-11 00:00:00
abstract::Immature oocytes from Xenopus laevis contain a 42S ribonucleoprotein particle (RNP) containing 5S RNA, tRNA, a 43 kDa protein, and a 48 kDa protein. A particle containing 5S RNA and the 43 kDa protein (p43-5S) liberated from the 42S particle upon brief treatment with urea can be purified by anion exchange chromatograp...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1991-04-25 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkl329
更新日期:2006-07-01 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2016-09-19 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1979-02-01 00:00:00
abstract::Telomerase activity, not detectable in somatic cells but frequently activated during carcinogenesis, confers immortality to tumors. Mechanisms governing expression of the catalytic subunit hTERT, the limiting factor for telomerase activity, still remain unclear. We previously proposed a model in which the binding of t...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkq827
更新日期:2011-02-01 00:00:00
abstract::In the last decade polycistronic vectors have become essential tools for both basic science and gene therapy applications. In order to co-express heterologous polypeptides, different systems have been developed from Internal Ribosome Entry Site (IRES) based vectors to the use of the 2A peptide. Unfortunately, these me...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkp716
更新日期:2009-11-01 00:00:00
abstract::Scalable and cost-effective production of error-free DNA is critical to meet the increased demand for such DNA in the field of biological science. Methods based on 'Dial-out PCR' have enabled the high-throughput error-free DNA synthesis from a microarray-synthesized DNA pool by labeling with retrieval PCR tags, and re...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gky016
更新日期:2018-04-20 00:00:00
abstract::The crp gene of E. coli, which codes for cAMP receptor protein (CRP), has been cloned in the plasmid pBR322 on the basis of a genetic complementation. One of the recombinant plasmids, pHA1, was shown to direct the synthesis of CRP in a cell-free system. The location of the crp gene was determined by constructing subcl...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/10.4.1345
更新日期:1982-02-25 00:00:00
abstract::Translation is a key regulatory step, linking transcriptome and proteome. Two major methods of translatome investigations are RNC-seq (sequencing of translating mRNA) and Ribo-seq (ribosome profiling). To facilitate the investigation of translation, we built a comprehensive database TranslatomeDB (http://www.translato...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkx1034
更新日期:2018-01-04 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkn040
更新日期:2008-04-01 00:00:00
abstract::The sequence of the 356 nucleotide residues of chrysanthemum stunt viroid (CSV) has been determined. Overlapping linear viroid fragments were obtained by partial ribonuclease digestion, radiolabelled in vitro at their 5'-ends, and sequenced using partial enzymic cleavage methods. Of the CSV sequence, 69% is contained ...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/9.12.2741
更新日期:1981-06-25 00:00:00
abstract::Here, we present an update of Breast Cancer Now Tissue Bank bioinformatics, a rich platform for the sharing, mining, integration and analysis of breast cancer data. Its modalities provide researchers with access to a centralised information gateway from which they can access a network of bioinformatic resources to que...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkx913
更新日期:2018-01-04 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkv1349
更新日期:2016-04-07 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/16.24.11737
更新日期:1988-12-23 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/17.22.8931
更新日期:1989-11-25 00:00:00
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journal_title:Nucleic acids research
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更新日期:1993-09-25 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkv563
更新日期:2015-10-15 00:00:00
abstract::Two different genomic genes for the COUP-transcription factor, COUP-TF I and COUP-TF II, have been isolated from a human cosmid genomic library using a [32P]-labeled cDNA probe. Data obtained from Southern blot analysis of these cosmid clones indicated that two closely related genes exist in the human genome and have ...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/18.23.6857
更新日期:1990-12-11 00:00:00
abstract::Equilibrative nucleoside transporters (ENTs) are a recently characterized and poorly understood group of membrane proteins that are important in the uptake of endogenous nucleosides required for nucleic acid and nucleoside triphosphate synthesis. Despite their central importance in cellular metabolism and nucleoside a...
journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkf564
更新日期:2002-10-15 00:00:00
abstract::In addition to maintaining the GenBank® nucleic acid sequence database, the National Center for Biotechnology Information (NCBI) provides analysis and retrieval resources for the data in GenBank and other biological data made available through the NCBI Web site. NCBI resources include Entrez, the Entrez Programming Ut...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2011-01-01 00:00:00
abstract::DNA assembly allows individual DNA constructs or libraries to be assembled quickly and reliably. Most methods are either: (i) Modular, easily scalable and suitable for combinatorial assembly, but leave undesirable 'scar' sequences; or (ii) bespoke (non-modular), scarless but less suitable for construction of combinato...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:2019-02-20 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/gkx1302
更新日期:2018-03-16 00:00:00
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journal_title:Nucleic acids research
pub_type: 杂志文章
doi:10.1093/nar/30.5.1103
更新日期:2002-03-01 00:00:00
abstract::We have identified cDNAs encoding Mel-N1, the mouse homologue of a human nervous system-specific RNA-binding protein, Hel-N1. Two major mRNA transcripts of Mel-N1 were detected predominantly in the adult mouse brain by Northern blot analysis. To gain insight into the RNA binding specificity of Mel-N1, we performed ite...
journal_title:Nucleic acids research
pub_type: 杂志文章
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更新日期:1996-06-01 00:00:00