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Analysis shows transcription regulation in HTLV-1 influences immune regulation and cellular proliferation in host cells.
The IPOR sequence appears to regulate the transcription from both LTRs, suppressing the 5'LTR but activating the 3'LTR. Recruitment of Eomes to the IPOR is likely to influence the expression of Tax and HBZ. Since both viral genes are involved in diverse mechanisms for viral replication, cellular proliferation, and immune regulation, the IPOR may play a role in fine-tuning the modes of viral persistence in vivo.
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Sonoda et al. (2025) studied this question.
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