Navigation Links
Despite countless changes, original HIV infection lurks within

Scientists have been surprised to learn that, despite thousands of changes that viruses like HIV undergo in rapid fashion to evade the body's immune system, the original version that caused the infection is still present in the body months later.

The finding, published in the June issue of the Journal of Virology, is the result of an uncommonly detailed look at the cat-and-mouse action that takes place in an organism shortly after infection. The work is aimed at understanding the earliest stages of infection by HIV more thoroughly, to help scientists develop ways either to quash the infection outright or to develop a vaccine to prevent infection.

The research, which was conducted by scientists at the University of Rochester Medical Center, is based on an analysis of more than 100,000 genetic snippets of a virus known as SIV, or simian immunodeficiency virus, which infects monkeys and is a close cousin of HIV.

While HIV has flummoxed scientists for nearly three decades, that's certainly not because our immune system fails to respond. Rather, within two or three weeks of infection, the onslaught of immune cells puts the virus on the run to such an extent that the virus must mutate rapidly to evade the body's defenses.

HIV changes quickly and continually, creating thousands and thousands of mutated versions of itself in a process called "viral escape." The virus changes; the immune cells hunting it down change in response; and the virus changes again, and so on, in a kind of molecular arms race.

"Viral escape is a significant phenomenon in HIV it's what allows HIV to elude the immune system," said Ha Youn Lee, Ph.D., the assistant professor in the Department of Biostatistics and Computational Biology who led the project.

"The dynamics in the earliest stage of infection by HIV are incredibly complex, and understanding what happens is crucial for developing a vaccine," Lee added.

To do the study, Lee's team applied a mathematical model to data originally gathered by David O'Connor, Ph.D., at the University of Wisconsin at Madison, who studies how SIV evolves. Lee's team analyzed the genetic features of three key sections of the SIV genome as they changed during the first few months of infection in eight macaque monkeys, part of an effort to quantify how quickly the process of viral escape occurs.

The research took advantage of a method known as ultradeep sequencing, which provides hundreds or thousands of glimpses of a single genetic change, compared to approximately 50 or so looks using conventional methods.

"This new technology is very exciting," said Lee. "It allows us to look at the earliest stages of infection in more depth than we could otherwise, and to quantify exactly what is going on in the body. If we can understand it more completely, we can fine-tune vaccines under development."

As expected, the team found that immune cells known as CD8+ T-lymphocytes, also known as cytotoxic T cells, are a powerful force in the life of SIV when it first causes infection. While scientists have known that the CD8 attack on the virus is strong, the latest work quantifies the body's response. They found that the original portions of the virus degrade 400 times faster in response to CD8 cells than they would have if those cells weren't a factor what scientists call significant "selective pressure" on the virus.

The team also found that SIV creates such mutants in response to the assault by CD8 cells at about the same rate as HIV does.

But the most striking finding is that the original viral genetic sequences are still present in the body months after the initial infection, at a time that scientists call the "viral set point," which occurs about two to five months after infection. It's a signal of just how difficult it is for the body to eradicate HIV from the body key portions of the virus have managed to survive despite the immense immune assault.

"It's a surprise that the original virus stays in the body so long," said Stephen Dewhurst, Ph.D., professor of Microbiology and Immunology and one of the study authors.

"We know that the virus confronts such a strong response from the body's immune system that the virus evolves quickly to cope with it. Yet, the virus is able to establish a reservoir somewhere in the body, where it continues to reproduce and does not have to respond to the threat from the immune system," Dewhurst added.


Contact: Tom Rickey
University of Rochester Medical Center

Related biology news :

1. Pesky aphid thrives despite weak immune system
2. Despite risk, older African-Americans more likely than others to avoid flu vaccine
3. Despite claims, UK did not gas Iraqis in the 1920s, new research finds
4. Birds in Flint Hills of Kansas, Oklahoma face population decline despite large habitat
5. Organic soils continue to acidify despite reduction in acidic deposition
6. Despite peacenik reputation, bonobos hunt and eat other primates too
7. Despite awareness of global warming Americans concerned more about local environment
8. CITES caviar export quotas remain steady for beluga sturgeon despite threat of extinction
9. River delta areas can provide clue to environmental changes, Texas A&M prof says
10. River delta areas can provide clue to environmental changes, Texas A&M prof says
11. Aboriginal hunting and burning increase Australias desert biodiversity, Stanford researchers find
Post Your Comments:
(Date:11/4/2015)... York , November 4, 2015 ... a new market report published by Transparency Market Research "Home ... Growth, Trends and Forecast 2015 - 2022", the global home ... US$ 30.3 bn by 2022. The market is estimated ... forecast period from 2015 to 2022. Rising security needs ...
(Date:10/29/2015)... ARBOR, Mich. , Oct. 29, 2015 /PRNewswire/ ... Eurofins Genomics for U.S. distribution of its DNA ... DNA-seq kit and Rubicon,s new ThruPLEX Plasma-seq kit. ... to enable the preparation of NGS libraries for ... plasma for diagnostic and prognostic applications in cancer ...
(Date:10/27/2015)... October 27, 2015 Munich, ... Gaze Mapping technology (ASGM) automatically maps data from mobile ... Glasses , so that they can be quantitatively ... Munich, Germany , October 28-29, 2015. ... data from mobile eye tracking videos created with ...
Breaking Biology News(10 mins):
(Date:11/30/2015)... ... November 30, 2015 , ... Imagine ... Jurassic World: The Exhibition, opening in March 2016 at Melbourne Museum in Melbourne, ... tour including several North American tour dates. The Exhibition is based on Universal ...
(Date:11/30/2015)... 30, 2015  Aytu BioScience, Inc. (OTCQB: AYTU), a ... conditions, will present at two upcoming investor conferences. Aytu ... real-time virtual conference, to be held December 3, 2015, ... be held December 2 nd & 3 rd ... and streamed live via webcast. Josh Disbrow ...
(Date:11/30/2015)... Israel , Nov. 30, 2015 ... leading developer of adult stem cell technologies for neurodegenerative diseases, ... has been awarded an additional grant of approximately $735,000 from ... (OCS). This grant, the second this year, brings the total ... $1.8 million (approximately NIS7 million).  ...
(Date:11/26/2015)... , November 26, 2015 /PRNewswire/ ... --> Accutest Research Laboratories, ... Contract Research Organization (CRO), has formed ... Cancer Center - Temple Health for ... ,     (Photo: ) , ...
Breaking Biology Technology: