Genetic Analysis Offers Insights Into AIDS Resistance

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Research published in the May 13 issue of Nature Genetics also implicated the HLA-B gene. That study found that HLA-B, in combination with another gene, KIR3DL1, might confer some protection against AIDS progression.

But HIV doesn't seem to be able to shut off HLA-C, the third gene variant identified by the researchers behind the new study. "This had not been a focus of attention in the past because it was not known that it is important in the control of HIV," Goldstein said. "We've now implicated this part of the immune response as being important so it now becomes a focus."

"It might be that this gene represents a vulnerable point for HIV," he added. "As far as we know, HIV can't act against it."

The three gene variants identified in the study explain 15 percent of the variability in how well people contain their viral load. "In genetic terms, that's a lot," Goldstein said. "These are very important genetic effects."

The next CHAVI study will look at what factors might protect people from becoming infected with HIV in the first place.

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