Gene variants protect against relapse after treatment for hepatitis C

March 13, 2014

Researchers at the Sahlgrenska Academy, University of Gothenburg, have identified a gene, which explains why certain patients with chronic hepatitis C do not experience relapse after treatment. The discovery may contribute to more effective treatment.

More than 100 million humans around the world are infected with hepatitis C virus. The infection gives rise to chronic , which may result in reduced , and liver cancer. Even though anti-viral medications often efficiently eliminate the virus, the infection recurs in approximately one fifth of the patients.

Prevents incorporation in DNA

Martin Lagging and co-workers at the Sahlgrenska Academy have studied an enzyme called inosine trifosfatas (ITPase), which normally prevents the incorporation of defective building blocks into RNA and DNA.

Unexpectedly they found that the gene encoding for ITPase (ITPA) had significance for the treatment outcome in C virus infection.

Five times lower risk

Earlier studies had shown that approximately one third of all people carry variants of the ITPA gene that result in reduced ITPase activity. The research team at the Sahlgrenska Academy showed that patients with these gene variants exhibited a more than a five times lower risk of experiencing relapse after treatment.

Relapse a significant problem

The study encompassed over 300 patients and was carried out in cooperation with hepatitis researchers in several Nordic countries.

"Relapse after completed treatment is a significant problem in chronic hepatitis C, and the results may contribute to explaining why the infection recurs in many patients. Our hypothesis is that a low ITPase activity results in defective nucleotides being incorporated into the virus RNA, which makes the virus unstable," Martin Lagging said.

Important to other virus infections

According to Martin Lagging, the discovery may also have significance for other .

"A medication that interferes with the enzyme's activity could have a broad antiviral effect, but this must be further investigated in future studies."

More information: Variants of the inosine triphosphate pyrophosphatase gene are associated with reduced relapse risk following treatment for HCV genotype 2/3, DOI: 10.1002/hep.27009

Related Stories

New focus to combat rising liver disease

July 26, 2013

University of Adelaide researchers are investigating how the liver responds to hepatitis C virus (HCV) and why some people can control the virus while others can't. The aim is to find better therapies to combat hepatitis ...

Recommended for you

Experimental MERS vaccine shows promise in animal studies

July 28, 2015

A two-step regimen of experimental vaccines against Middle East respiratory syndrome (MERS) prompted immune responses in mice and rhesus macaques, report National Institutes of Health scientists who designed the vaccines. ...

Can social isolation fuel epidemics?

July 21, 2015

Conventional wisdom has it that the more people stay within their own social groups and avoid others, the less likely it is small disease outbreaks turn into full-blown epidemics. But the conventional wisdom is wrong, according ...

Lack of knowledge on animal disease leaves humans at risk

July 20, 2015

Researchers from the University of Sydney have painted the most detailed picture to date of major infectious diseases shared between wildlife and livestock, and found a huge gap in knowledge about diseases which could spread ...

IBD genetically similar in Europeans and non-Europeans

July 20, 2015

The first genetic study of inflammatory bowel disease (IBD) to include individuals from diverse populations has shown that the regions of the genome underlying the disease are consistent around the world. This study, conducted ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.