期刊
JOURNAL OF VIROLOGY
卷 80, 期 13, 页码 6441-6457出版社
AMER SOC MICROBIOLOGY
DOI: 10.1128/JVI.00591-06
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- NCRR NIH HHS [M01 RR000052, M01 RR 00052] Funding Source: Medline
- NIAID NIH HHS [R01 AI051178, R01 AI043222, K08 AI060367, AI 51178, R37 AI051178, K08 AI 060367, AI 43222, AI 065960, R01 AI065960] Funding Source: Medline
Antiretroviral therapy can reduce human immunodeficiency virus type 1 (HIV-1) viremia to below the detection limit of ultrasensitive clinical assays (50 copies of HIV-1 RNA/ml). However, latent HIV-1 persists in resting CD4(+) T cells, and low residual levels of free virus are found in the plasma. Limited characterization of this residual viremia has been done because of the low number of virions per sample. Using intensive sampling, we analyzed residual viremia and compared these viruses to latent proviruses in resting CD4(+) T cells in peripheral blood. For each patient, we found some viruses in the plasma that were identical to viruses in resting CD4+ T cells by pol gene sequencing. However, in a majority of patients, the most common viruses in the plasma were rarely found in resting CD4+ T cells even when the resting cell compartment was analyzed with assays that detect replication-competent viruses. Despite the large diversity of pol sequences in resting CD4+ T cells, the residual viremia was dominated by a homogeneous population of viruses with identical pol sequences. In the most extensively studied case, a predominant plasma sequence was also found in analysis of the env gene, and linkage by long-distance reverse transcriptase PCR established that these predominant plasma sequences represented a single predominant plasma virus clone. The predominant plasma clones were released for months to years without evident sequence change. Thus, in some patients on antiretroviral therapy, the major mechanism for residual viremia involves prolonged production of a small number of viral clones without evident evolution, possibly by cells other than circulating CD4(+) T cells.
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