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Innate resistance to HIV. A small proportion of humans show partial or apparently complete innate resistance to HIV, the virus that causes AIDS. [1] The main mechanism is a mutation of the gene encoding CCR5, which acts as a co-receptor for HIV. It is estimated that the proportion of people with some form of resistance to HIV is under 10%.
Mutations that confer a substantial selective advantage to HIV survival can therefore quickly replicate within an individual, creating a new, resistant strain. [ 8 ] [ 5 ] These mutations accumulate over generations and in populations, resulting in the great genetic variation within populations of HIV, and an increased probability of a virion ...
C-C chemokine receptor type 5, also known as CCR5 or CD195, is a protein on the surface of white blood cells that is involved in the immune system as it acts as a receptor for chemokines. [ 5 ] In humans, the CCR5 gene that encodes the CCR5 protein is located on the short (p) arm at position 21 on chromosome 3.
HIV Drug Resistance Database, also known as Stanford HIV RT and Protease Sequence Database, is a database at Stanford University that tracks 93 common mutations of HIV. It has been recompiled in 2008 listing 93 common mutations, after its initial mutation compilation in 2007 of 80 mutations. The latest list utilizes data from other laboratories ...
A chunk of the human population naturally carries a mutation that makes CCR5 nonfunctional (one study found that 10 percent of Europeans have this mutation), which often results in a smaller ...
The genome and proteins of HIV (human immunodeficiency virus) have been the subject of extensive research since the discovery of the virus in 1983. [1] [2] "In the search for the causative agent, it was initially believed that the virus was a form of the Human T-cell leukemia virus (HTLV), which was known at the time to affect the human immune system and cause certain leukemias.
A resistance mutation is a mutation in a virus gene that allows the virus to become resistant to treatment with a particular antiviral drug. The term was first used in the management of HIV, the first virus in which genome sequencing was routinely used to look for drug resistance. At the time of infection, a virus will infect and begin to ...
Some people are resistant to certain strains of HIV. [49] For example, people with the CCR5-Δ32 mutation are resistant to infection by the R5 virus, as the mutation leaves HIV unable to bind to this co-receptor, reducing its ability to infect target cells. Sexual intercourse is the major mode of HIV transmission.