Nucleus remodeling activity is conserved amongst diverse SIV Vpr isolates

Viral protein Vpr, essential for HIV replication, triggers a cellular response known as DNA damage repair (DDR) that leads to global epigenetic changes and activation of transcription programs. This response is observed in various SIV strains, despite the wide range of these viruses. In this study, researchers examined a panel of 16 SIV Vpr isolates and found that 13 of them efficiently activated DDR signaling, compared to uninfected cells.

Additionally, infected cells showed higher levels of histone modifications linked to transcription and euchromatin formation, as well as heightened activation of transcription factors crucial for HIV-1 promoter activity. By altering a specific Vpr isolate that didn't respond to DDR, the researchers identified new amino acids necessary for this response.

Structural modeling and functional tests suggested that diverse SIV Vpr strains from African green monkey species activate nuclear remodeling through a unique set of amino acids. Overall, these findings indicate that the ability to hijack DDR responses for nuclear remodeling is a shared characteristic of Vpr across multiple SIV isolates.