Abstract
A method for detection of proviral human immunodeficiency virus DNA in dried blood spots on filter paper by direct polymerase chain reaction (PCR) has been developed. To develop the method, a standard system was used which was prepared from cells each containing a single integrated provirus and titrated with normal donor blood. This rapid procedure provides virtually quantitative yields of nuclear DNA and exploits most of the standard methodology described for blood specimens. A nested PCR using SK38-SK39 gag as the internal primer pair was also designed; this PCR detected a single copy of provirus per filter at near theoretical frequency with SK19 probe. The utility of the procedure was demonstrated with clinical specimens. Blood spot filters from human immunodeficiency virus-infected and uninfected individuals were readily and unequivocally discriminated. The method is designed for ultimate use with large (1.5-ml) sample preparation tubes that are compatible as PCR tubes with thermal cyclers. This will permit convenient, direct single-tube PCR of dried blood specimens on filters. It should be adaptable to analysis of dried blood spots for a variety of infectious or genetic diseases.
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