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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Physical locus of the DNA polymerase gene and genetic maps of bacteriophage T5 mutants.

Segments of DNA that contained the DNA polymerase gene of bacteriophage T5 were isolated. The physical locus of the gene was identified by transforming Escherichia coli with purified DNA fragments generated by restriction enzyme digestions, and the transformed cells were used to rescue amber mutants of T5 with mutations in the gene for DNA polymerase. The method is applicable to any other gene that has mutations with low reversion frequencies. We studied the following mutations of the T5 DNA polymerase gene, reading from left to right by the standard convention (D. J. McCorquodale, Crit. Rev. Microbiol. 4:101-159, 1975): D7, D8, aml, ts5E-ts53, am6, and D9. These loci were found to reside within three pieces of DNA with a total length of 3,600 base pairs. Because the structural gene for T5 DNA polymerase is estimated to be 2,600 base pairs long, the whole structural gene may reside in these segments. These are located 58.3 to 61.3% of the distance from the left end of the DNA. The left-end piece of the DNA (1,100 base pairs) containing the polymerase gene has loci D7 and D8, and the right-end piece (1,600 base pairs) has locus D9, according to the results of the transformation assay. These results are consistent with the genetic map.[1]

References

  1. Physical locus of the DNA polymerase gene and genetic maps of bacteriophage T5 mutants. Fujimura, R.K., Tavtigian, S.V., Choy, T.L., Roop, B.C. J. Virol. (1985) [Pubmed]
 
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