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The Role of HIV-1-Encoded microRNAs in Viral Replication.
Microorganisms 2024 Februrary 21
microRNAs (miRNAs) are small non-coding RNAs (sncRNAs) that play an important role in the life cycle of human viruses. We sought to characterize human immunodeficiency virus 1 (HIV-1)-encoded miRNAs and determine their role in viral replication. Initially, a bioinformatic analysis was used to predict HIV-1-encoded miRNAs. Next, a representative number of these predicted sequences were verified using a miRNA microarray chip, reverse transcription PCR (RT-PCR), and the deep sequencing of RNA extracted from HIV-1-infected cells. Eight HIV-1-encoded sncRNA sequences conforming to the criteria that define miRNAs were identified in HIV-1-infected immortalized T cells and human primary CD4+ lymphocytes; five of the eight sequences have not been previously reported. Deep sequencing validated the presence of these virus-encoded miRNA sequences and uncovered large numbers of atypical sncRNA sequences, lacking characteristics of conventional miRNAs. We named these sequences small RNAs (smRNAs). The overexpression of four candidate HIV-1-encoded miRNAs and silencing of two smRNAs significantly increased HIV-1 viral replication. Our study uncovered novel HIV-1-encoded sncRNAs that, upon deregulated expression, alter viral titers in HIV-1-infected cells, suggesting that miRNAs and smRNAs play an important role in regulating viral replication. Future studies may reveal the function of HIV-1-encoded sncRNAs and their possible implications for diagnosis and treatment.
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