Evidence map›Paper›PMID 1518811›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America1992

Genomic targeting with a positive-selection lox integration vector allows highly reproducible gene expression in mammalian cells.

S Fukushige, B Sauer

Open access · greenAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 1992. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 71 papers.

0numbers the graph read from it
0cells of the map it votes in
71citing papers in PubMed
2.7field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

71 citing papers in PubMed, 208 citations in OpenAlex.

  1. Article
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  3. A CRISPR-Cas9, Cre-The CRISPR journal · 2020
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  9. A pathway from chromosome transfer to engineering resulting in human and mouse artificial chromosomes for a variety of applications to bio-medical challenges.Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology · 2015
    Review
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11 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

2 authors at 1 institution in 1 country.

S FukushigeDuPont-Merck Pharmaceutical Co., Wilmington, DE 19880-0328.
B Sauer
Wilmington University · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Stable transformants of mammalian cells from gene transfer often show extreme variability in expression of the introduced transgene. This occurs from the highly variable number of copies integrated into the genome and from position effects on gene expression due to random integration. We have eliminated both of these constraints on predictable gene expression by use of a lox recombination vector. The positive selection vector system is designed to directly select Cre-mediated DNA integration at a lox target previously placed into the genome of cultured mammalian cells. Proper targeting activates expression of a defective lox-neomycin phosphotransferase (neo) fusion gene target. With CHO cell lines containing this target, almost all of the selected transformants (54 of 56 independent G418-resistant colonies) were simple single-copy integrants of the targeting DNA. To monitor gene expression at a single chromosomal site, we used a beta-actin promoter-lacZ reporter construct. Independent G418-resistant colonies from site-specific integration of the reporter gene all showed nearly identical levels of beta-galactosidase activity when the reporter construct integrated at a particular chromosomal position. The same construct integrated at a second chromosomal position exhibited a slightly different level of activity, characteristic of that second position. These results show that Cre-mediated site-specific integration can facilitate the construction of isogenic cell lines and thereby permit reproducible gene expression in stably transformed cell lines.

Indexed as

Gene ExpressionGenetic VectorsIntegrasesTransfectionViral ProteinsAnimalsBase SequenceCHO CellsCricetinaeDNA NucleotidyltransferasesGenetic EngineeringIn Vitro TechniquesMolecular Sequence DataRecombination, GeneticRegulatory Sequences, Nucleic AcidCre recombinaseDNA NucleotidyltransferasesIntegrasesViral Proteins

Identifiers

PMID1518811
PMCPMC49823
OpenAlexW2020024953

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.