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• W2043282277 endingPage "937" @default.
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• W2043282277 abstract "A detailed physical map of the early region of bacteriophage T7 DNA has been constructed. This map contains: locations for all the cuts made by the restriction endonucleases HindII, HpaII, HaeIII and HaeII, and many of the cuts by HhaI; the approximate end points for each of 61 different deletions; initiation sites and the termination site for RNAs made by Escherichia coli RNA polymerase; an initiation site for RNA made by T7 RNA polymerase; the five primary RNase III cleavage sites of the early region; and the coding sequences for perhaps nine different early proteins. Virtually all of the non-overlapping coding capacity of the five early messenger RNAs is used, except for untranslated stretches of perhaps 30 or so nucleotides at the ends. It seems likely that each of the nine early proteins is made from its own ribosome-binding and initiation site. The mapped restriction cuts provide fixed reference points, and allow DNA fragments containing specific genetic signals to be identified and isolated. The nucleotide sequences around the ends of three different T7 deletions have been determined. Each deletion eliminated a segment of DNA between repeated sequences of seven, eight or ten base-pairs, located 578 to 2100 base-pairs apart in the wild-type sequence. In each case, one copy of the repeated sequence was retained in the deletion mutant. This is consistent with the deletions having arisen by a genetic crossover between the repeated sequences. The approximate frequency of genetic recombination per base-pair has been estimated within two early genes; in both cases, the value was close to 0.01% recombination per base-pair, consistent with the value expected from the total length of the T7 genetic map. Genetic recombination between non-overlapping deletions appears to be severely depressed when the distance between the deletions is closer than about 40 to 50 base-pairs, but recombination between a point mutation and a deletion does not appear to be similarly depressed. This suggests that efficient genetic recombination in T7 may require a base-paired “synapse” of some minimum size between the recombining DNA molecules." @default.
• W2043282277 created "2016-06-24" @default.
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• W2043282277 date "1979-12-01" @default.
• W2043282277 modified "2023-10-15" @default.
• W2043282277 title "Genetic and physical mapping in the early region of bacteriophage T7 DNA" @default.
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• W2043282277 doi "https://doi.org/10.1016/0022-2836(79)90520-5" @default.
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