Summary
Conjugal transfer of UV-damaged F-prime sex factors was investigated in connection with indirect induction. Using donors and recipients of different ability to perform pyrimidine dimer excision and/or recombination repair, it was found that:
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1.
Transfer of UV-irradiated F-prime DNA to the recipient cell is unaffected by the presence of pyrimidine dimers. The efficiency of transfer does not decrease even at rather high UV doses given to the donor in which, as a result of irradiation, chromosome replication is strongly inhibited.
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2.
Transfer of the signal responsible for indirect UV induction can be correlated with the transmission of the UV-damaged sex factor from donor to recipient.
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3.
In the recipient cell, the sex factor DNA does not undergo excision repair but can be repaired by recombination. It is inferred that the transferred DNA structure is not fully double-stranded.
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4.
In conclusion, indirect UV induction occurs in a λ-lysogenic recipient upon transmission of a UV damaged replicon which carries stabilized lesions as a consequence of its conjugal transfer.
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George, J., Devoret, R. Conjugal transfer of UV-damaged F-prime sex factors and indirect induction of prophage λ. Molec. Gen. Genet. 111, 103–119 (1971). https://doi.org/10.1007/BF00267786
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DOI: https://doi.org/10.1007/BF00267786