Study, which is published in Nature Immunology, shows that viral load accounts for 9% variability, while CCR5 and CCL3L1 combined account for 6%.

Genetic factors significantly contribute to the pace of HIV/AIDS progression, according to researchers from the University of Texas Health Science Center in San Antonio.

Researchers examined genetic information from more than 3,500 HIV-1 infected and uninfected individuals. They found that individuals who had specific combinations of two genes—CCR5, which helps facilitate HIV entry into the cell, and CCL3L1, an immune response gene—were much more likely to have reduced immune responses and a greater decline in CD4 T cells.

The investigators discovered that in HIV-infected subjects, viral load contributed 9% to the variability in rate of progression to AIDS; variations in CCR5 and CCL3L1 combined accounted for 6% variability in AIDS progression rates.

The research appears in Nature Immunology.

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