Using a new strategy, capture-RT-PCR, bcrabl fusion mRNA sequences wer
e specifically and sensitively detected in samples of whole blood from
leukemia patients with the Philadelphia chromosome. Sample processing
required only mixing blood with the chaotropic salt, GuSCN, and mRNA
was captured during a short incubation of prepared blood with an affin
ity membrane. Immobilized mRNA sequences were amplified without elutio
n. No radioisotopes or Southern transfer were needed.