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PCR-in situ hybridization (PCR-ISH) was developed and utilized to determine the distribution of human T-cell lymphotropic virus type 1 (HTLV-1) tax proviral DNA in peripheral blood lymphocytes (PBL) from patients with HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). PCR-ISH of HTLV-1 tax DNA in PBL from patients with HAM/TSP revealed that 1 in 5,000 to 1 in 10,000 PBL contained virus. PCR-ISH was sensitive, because a positive signal was consistently demonstrated from the HTLV-1-infected cell lines HUT-102 (which contains four to six copies of HTLV-1 proviral DNA per cell) and MT-1 (which contains one to three copies of HTLV-1 proviral DNA per cell). Also, intracellular amplification by PCR-ISH significantly increased sensitivity compared with conventional ISH and was shown to be specific for HTLV-1 tax DNA. These results are in contrast to solution-phase PCR amplification in which greater than 1% of cells were estimated to be infected. The discordance between these results is discussed and may indicate that more than one copy of HTLV-1 tax proviral DNA is present in an individual PBL.

journal of virology

PCR-in situ hybridization detection of human T-cell lymphotropic virus type 1 (HTLV-1) tax proviral DNA in peripheral blood lymphocytes of patients with HTLV-1-associated neurologic disease