Mapping the Human Herpesvirus 6B transcriptome.

Area of Science:

• Virology
• Transcriptomics
• Molecular Biology

Background:

• The "omics" era has advanced the study of RNA transcripts.
• Human Herpesvirus 6B (HHV-6B) infection involves complex viral gene expression.
• Understanding the HHV-6B transcriptome is crucial for antiviral research.

Purpose of the Study:

• To identify and characterize novel and differentially expressed RNA transcripts during HHV-6B productive infection.
• To analyze the HHV-6B transcriptome at multiple time points post-infection.
• To classify the kinetic class of viral open reading frames (ORFs).

Main Methods:

• Large-scale RNA sequencing (RNA-seq) of HHV-6B infected Molt-3 T-cells.
• Analysis of viral transcripts at six different time points (6, 9, 12, 24, 48, 72 hours post-infection).
• Use of cycloheximide (CHX) and phosphonoacetic acid (PAA) to determine ORF kinetic classes.
• Validation of novel transcripts using RT-PCR and Sanger sequencing.

Main Results:

• Identification of numerous novel HHV-6B transcripts, many exhibiting differential expression across time points.
• Confirmation of new splice variants for previously reported ORFs.
• Classification of viral ORFs into distinct kinetic classes based on inhibitor treatments.
• Proposed an updated version of the HHV-6B Z29 genome annotation.

Conclusions:

• The HHV-6B transcriptome is highly diverse and complex, with many uncharacterized transcripts.
• RNA-seq provides a powerful approach to dissect viral transcriptomes during infection.
• The findings contribute to a more comprehensive understanding of HHV-6B gene expression and regulation.