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- W2088552714 abstract "The recent expansion of studies on hypermutation may benefit from a fast and uncomplicated way to measure mutation rates. In this paper we compare different retroviral vector designs for monitoring hypermutation in vivo. Retroviral vectors combine a high transduction rate with integration at random sites within the host cell genome, thus equalizing positional effects on the reporter gene. The vectors contain a reporter gene with a premature TAG termination codon; upon reversion, a full-length fluorescent protein is expressed. Any single point mutation at the amber codon activates the reporter--except the transition from G to A, which only creates the stop codon TAA. In the construct, the reporter gene is followed by an internal ribosome entry site and a second marker that allows selection of stably transduced cells. As a reporter gene, we tested the green and yellow fluorescence proteins (GFP and YFP); and various proteins with red fluorescence (dsRed). The second marker was either a drug resistance gene, or a second fluorescent protein. We also introduced various cis-acting enhancer elements into the reporter construct, to study the simultaneous activity of enhancers on transcription and hypermutation. We found that GFP as a reporter, combined with a drug selection marker, gave the most consistent and convenient mutation rate measurements. DsRed is a good alternative to GFP, but variants with greater fluorescence intensity are needed when combined with green fluorescence measurements. We also confirm that no immunoglobulin specific sequence is needed to target hypermutation. Depending on their position in these ectopically expressed constructs, enhancers can have positive or negative effects on hypermutation." @default.
- W2088552714 created "2016-06-24" @default.
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- W2088552714 date "2005-05-01" @default.
- W2088552714 modified "2023-09-23" @default.
- W2088552714 title "Retroviral vectors to monitor somatic hypermutation" @default.
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- W2088552714 doi "https://doi.org/10.1016/j.jim.2005.02.015" @default.
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