There’s a high probability that people who are prone to herpes simplex virus (HSV) outbreaks can inherit that susceptibility through their genes, University of Utah researchers report in a new study.
In the Feb. 1 issue of The Journal of Infectious Diseases, the researchers identify a region on the long arm of human chromosome 21 with high odds—at least 1,000-to-1—of being linked to cold sore susceptibility. The researchers further say they pinpointed six specific genes in that chromosomal region as candidates for making people prone to outbreaks of cold sores (also called “fever blisters”). Cold sores occur when the herpes virus reactivates from its quiescent state within the nerve, infecting the lip, nose, or face.
Discovery of the probable link could lead to the development of new drugs that reduce the frequency of herpes outbreaks, according to John D. Kriesel, M.D., the study’s corresponding author and research associate professor in the U School of Medicine’s Division of Infectious Diseases.
“One or more of these genes might make excellent targets for new drugs to reduce the number of herpes outbreaks,” Kriesel said. Maurine R. Hobbs, Ph.D., research assistant professor in the Division of Endocrinology and Metabolism, is the study’s first author.
The study is available online now.
There are two types of the herpes simplex virus. Type 1 (HSV-1) is responsible for the vast majority of cold sores, the most common recurring viral infection in humans, as well as herpes keratits, an eye infection that can lead to corneal scarring and blindness. The majority of the U.S. population is infected with HSV-1, although millions of people manifest no symptoms. Nonetheless, at least 40 percent of the population will experience at least one cold sore at some point during their lives.
Herpes simplex virus type 2 (HSV-2) is the primary cause of genital herpes, and infects an estimated 17 percent of the U.S. population or approximately 50 million people. Between 5 million and 10 million people in this group have recognized cases of genital herpes.
To search for cold sore susceptibility genes, the U researchers used linkage analysis, which traces genetic markers in families to identify regions on chromosomes that harbor disease genes. When genetic mutations are passed from parent to offspring, genetic markers near the disease gene are passed along as well. By identifying markers shared among family members, researchers can locate regions of chromosomes where genes responsible for disease may lie. The U of U study was the first whole-genome study of herpes simplex virus to use linkage analysis.
The researchers studied 421 people from 39 large Utah families. The families are part of a genomic study called the Utah Genetic Reference Project. Participants were grouped according to how often they experienced cold sore outbreaks:Frequently affected—HSV-1 infected and two or more outbreaks annually
The probable genetic link is not the only component believed to trigger reactivation of HSV and cold sores. Environmental factors, such as fever, wind, and sunburn, also are believed to play a part. Viral factors, like strain and burden of latent infection, also probably influence the frequency of HSV outbreaks.
The researchers began the study with no preconceptions about which regions of the human genome might be linked to cold sore susceptibility, Kriesel said. Therefore, the linkage with the long arm of chromosome 21 came as a surprise. “We didn’t start with the thought that particular genes were important in the search,” he said. “That helped ensure an unbiased study and led to a completely unexpected result in chromosome 21.”
Now Kriesel, Hobbs, and their colleagues are looking at the six candidate susceptibility genes to find out which are related to cold sores. Three of those genes look particularly promising to study.
“Finding a drug target to reduce the frequency of cold sores would be even more valuable if we could expand our study results to include genital herpes or herpes keratitis,” Kriesel said, “and that’s something I’d like to do.”
Phil Sahm | EurekAlert!
WAKE-UP provides new treatment option for stroke patients | International study led by UKE
17.05.2018 | Universitätsklinikum Hamburg-Eppendorf
First form of therapy for childhood dementia CLN2 developed
25.04.2018 | Universitätsklinikum Hamburg-Eppendorf
The more electronics steer, accelerate and brake cars, the more important it is to protect them against cyber-attacks. That is why 15 partners from industry and academia will work together over the next three years on new approaches to IT security in self-driving cars. The joint project goes by the name Security For Connected, Autonomous Cars (SecForCARs) and has funding of €7.2 million from the German Federal Ministry of Education and Research. Infineon is leading the project.
Vehicles already offer diverse communication interfaces and more and more automated functions, such as distance and lane-keeping assist systems. At the same...
A research team led by physicists at the Technical University of Munich (TUM) has developed molecular nanoswitches that can be toggled between two structurally different states using an applied voltage. They can serve as the basis for a pioneering class of devices that could replace silicon-based components with organic molecules.
The development of new electronic technologies drives the incessant reduction of functional component sizes. In the context of an international collaborative...
At the LASYS 2018, from June 5th to 7th, the Laser Zentrum Hannover e.V. (LZH) will be showcasing processes for the laser material processing of tomorrow in hall 4 at stand 4E75. With blown bomb shells the LZH will present first results of a research project on civil security.
At this year's LASYS, the LZH will exhibit light-based processes such as cutting, welding, ablation and structuring as well as additive manufacturing for...
There are videos on the internet that can make one marvel at technology. For example, a smartphone is casually bent around the arm or a thin-film display is rolled in all directions and with almost every diameter. From the user's point of view, this looks fantastic. From a professional point of view, however, the question arises: Is that already possible?
At Display Week 2018, scientists from the Fraunhofer Institute for Applied Polymer Research IAP will be demonstrating today’s technological possibilities and...
So-called quantum many-body scars allow quantum systems to stay out of equilibrium much longer, explaining experiment | Study published in Nature Physics
Recently, researchers from Harvard and MIT succeeded in trapping a record 53 atoms and individually controlling their quantum state, realizing what is called a...
25.05.2018 | Event News
02.05.2018 | Event News
13.04.2018 | Event News
25.05.2018 | Event News
25.05.2018 | Machine Engineering
25.05.2018 | Life Sciences