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Discovery of a VZV Latency Transcript

ABSTRACT: A unique spliced varicella-zoster virus latency transcript represses expression of the viral transactivator gene 61

PROVIDER: PRJEB23238 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR2182860_1.fastq.gz	Fastqsanger.gz
	ERR2182860_2.fastq.gz	Fastqsanger.gz
	ERR2182870_1.fastq.gz	Fastqsanger.gz
	ERR2182870_2.fastq.gz	Fastqsanger.gz
	ERR2182861_1.fastq.gz	Fastqsanger.gz

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A spliced latency-associated VZV transcript maps antisense to the viral transactivator gene 61.

Project description:Varicella-zoster virus (VZV), an alphaherpesvirus, establishes lifelong latent infection in the neurons of >90% humans worldwide, reactivating in one-third to cause shingles, debilitating pain and stroke. How VZV maintains latency remains unclear. Here, using ultra-deep virus-enriched RNA sequencing of latently infected human trigeminal ganglia (TG), we demonstrate the consistent expression of a spliced VZV mRNA, antisense to VZV open reading frame 61 (ORF61). The spliced VZV latency-associated transcript (VLT) is expressed in human TG neurons and encodes a protein with late kinetics in productively infected cells in vitro and in shingles skin lesions. Whereas multiple alternatively spliced VLT isoforms (VLTly) are expressed during lytic infection, a single unique VLT isoform, which specifically suppresses ORF61 gene expression in co-transfected cells, predominates in latently VZV-infected human TG. The discovery of VLT links VZV with the other better characterized human and animal neurotropic alphaherpesviruses and provides insights into VZV latency.

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Kallikrein-mediated cytokeratin 10 degradation is required for VZV propagation in skin

Project description:Varicella Zoster Virus (VZV) is a skin-tropic virus that infects epidermal keratinocytes and causes chickenpox. Although common, VZV infection can be life-threatening particularly in the immunocompromised. Therefore, understanding VZV-keratinocyte interactions is important to find new treatments beyond vaccination and anti-viral drugs. In VZV- infected skin, Kallikrein 6 (KLK6), and the ubiquitin-ligase MDM2 are up-regulated concomitant with Keratin 10 (K10) down-regulation. MDM2 binds to K10 targeting it for degradation via the ubiquitin-proteasome pathway. Preventing K10 degradation reduced VZV propagation in culture and prevented epidermal disruption in skin explants. K10 knockdown induced expression of the nuclear receptor subfamily 4, group A, member 1 (NR4A1) and enhanced viral propagation in culture. NR4A1 knockdown prevented viral propagation in culture, reduced LC3 levels and increased LAMP2 expression. We therefore describe a novel drug-able pathway whereby MDM2 ubiquitinates and degrades K10 increasing NR4A1 expression allowing VZV replication and propagation.

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