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Recurrent herpes of the eye is caused by reactivation of the virus in a latently infected sensory ganglion, transport of the virus down the nerve axon to sensory nerve endings, and subsequent infection of ocular surface. The following classification of herpes simplex keratitis is important for understanding this disease:
Herpes simplex virions. Herpes simplex virus 1 and 2 (HSV 1 and HSV 2) are part of the alpha subfamily of herpesviruses. The lytic phase of infection occurs within mucoepithelial cells while the latent infection of these cells occurs in neurons. These two viruses are the cause of oral and genital herpes. [4]
Lytic infection is sometimes known as "productive" infection. Latent cells harbor the virus for long time periods, then occasionally convert to productive infection which may lead to a recurrence of symptomatic Herpes symptoms. During latency, most of the Herpes DNA is inactive, with the exception of LAT, which accumulates within infected cells.
An example of such a gene product is the latency associated transcripts (LAT) in herpes simplex virus, which interfere with apoptosis by downregulating a number of host factors, including major histocompatibility complex (MHC) and inhibiting the apoptotic pathway. [17] A certain type of latency could be ascribed to the endogenous retroviruses.
Herpes simplex 2 genomes can be divided into two groups: one is globally distributed and the other is mostly limited to sub Saharan Africa. [59] The globally distributed genotype has undergone four ancient recombinations with herpes simplex 1. It has also been reported that HSV-1 and HSV-2 can have contemporary and stable recombination events ...
Site of Latency Means of Spread HHV‑1: Herpes simplex virus-1 (HSV-1) α (Alpha) Mucoepithelial: Oral and/or genital herpes, herpetic gingivostomatitis, pharyngitis, eczema herpeticum, herpetic whitlow, herpes simplex keratitis, erythema multiforme, encephalitis, as well as other herpes simplex infections: Neuron (sensory ganglia)
Shemesh is the senior author of a new study recently published in the journal Cell Reports that identified a potential link between Alzheimer’s disease and the herpes simplex virus-1 (HSV-1).
HSV epigenetics is the epigenetic modification of herpes simplex virus (HSV) genetic code.. As of 2012, an estimated 3.7 billion people globally were infected with oral herpes simplex virus (HSV-1), and 417 million were living with genital herpes (HSV-2) worldwide (World Health Organization, 2018).