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

Independent production of CO2 sensitivity by nuclear gene Dly and a transmissible agent from delayed-recovery Drosophila melanogaster.

Flies of stocks designated delayed-recovery by McCrady and Sulerud (1964) remain temporarily paralyzed after exposure to carbon dioxide. This condition is similar to CO2-sensitivity, which occurs in flies infected with the maternally transmitted sigma viruus, but is due, at least in part, to the third chromosome mutant gene Dly. Because earlier work indicated that extracts of delayed-recovery flies could occasionally transmit CO2 sensitivity when injected into resistant recipients, we have tested the possibility that some delayed-recovery stocks contain a sigma-like transmissible virus, in addition to the Dly gene. We found that TDR-orange, a stock derived from the original delayed-recovery line, and temperature-cured populations of the same stock, both contain some agent that is transmissible by injection. TDR-BC3f, a stock derived by backcrossing through the male line to eliminate maternally transmitted factors, does not appear to contain such an infectious agent, but remains sensitive to CO2. These observations lead us to the conclusion that the originally described delayed-recovery stocks harbor an infectious extrachromosomal agent, in addition to possessing the Dly gene, and each is capable of producing a sensitivity to carbon dioxide.[1]


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