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Updated: May 7, 2026
Analysis of Simian Immunodeficiency Virus-specific CD8+ T-cells in Rhesus Macaques by Peptide-MHC-I Tetramer Staining
Published on: December 23, 2016
The genomic legacy of selectively breeding rhesus macaques for HIV/AIDS-related research
Background:
Rhesus macaques are the preferred non-human primate model for HIV/AIDS-related research. Specific major histocompatibility complex (MHC) haplotypes and genetic ancestry are linked to slow disease progression of Simian Immunodeficiency Virus (SIV) infections in macaques. To maximize their utility for HIV/AIDS research, the Southwest National Primate Research Center (SNPRC) has introduced targeted breeding strategies to reduce the prevalence of SIV-refractory MHC haplotypes and levels of admixture between Indian- and Chinese-origin macaques.
Results:
We characterized the MHC region in SNPRC macaques by targeted deep sequencing of 1,458 animals born over a ten-year period. Following the implementation of MHC management strategies, the prevalence of SIV-refractory MHC haplotypes reduced significantly while overall haplotype diversity was maintained. We investigated the impact of management strategies on admixture, population genetic structure, genetic diversity and inbreeding using whole exome sequencing of founding and colony-born animals (n=488). Admixture analysis of founders showed some Chinese ancestry, though population substructure more closely reflected primate research center source than geographical origin. The levels of Chinese ancestry declined significantly over time, though genetic diversity remains high. Finally, we performed genome-wide scans for genetic selection over time. We identify numerous genomic regions where allele frequencies have shifted significantly, supporting the presence of short-term adaptation within the colony.
Conclusions:
We show that colony management strategies have been successful without reducing genetic diversity of the MHC or exonic regions. We also show that colony genetic substructure is related to animal colony source and that mergers and migrations have reduced inbreeding and increased overall genetic diversity.
Insights
Targeted breeding strategies for rhesus macaques successfully reduced Simian Immunodeficiency Virus (SIV)-refractory major histocompatibility complex (MHC) haplotypes while maintaining genetic diversity. This enhances their utility in HIV/AIDS research by improving disease resistance.
Area of Science:
- Primate genetics
- Immunogenetics
- Comparative genomics
Background:
- Rhesus macaques are crucial non-human primate models for HIV/AIDS research.
- Major histocompatibility complex (MHC) haplotypes and genetic ancestry influence Simian Immunodeficiency Virus (SIV) progression.
- Southwest National Primate Research Center (SNPRC) implemented breeding strategies to optimize macaque models.
Purpose of the Study:
- To assess the impact of targeted breeding strategies on MHC haplotypes and genetic diversity in SNPRC rhesus macaques.
- To evaluate changes in admixture, population structure, and inbreeding.
- To identify genomic regions under selection within the macaque colony.
Main Methods:
- Deep sequencing of the MHC region in 1,458 macaques over ten years.
- Whole exome sequencing of 488 founding and colony-born animals.
- Genome-wide scans for genetic selection and analysis of population genetic structure.
Main Results:
- Significant reduction in SIV-refractory MHC haplotypes observed post-strategy implementation.
- Overall MHC and exonic genetic diversity were maintained.
- Admixture from Chinese-origin macaques decreased, while genetic diversity remained high; population substructure linked to colony source.
- Evidence of short-term adaptation identified through genome-wide selection scans.
Conclusions:
- SNPRC breeding strategies effectively reduced SIV-refractory MHC haplotypes without compromising genetic diversity.
- Colony management, including mergers and migrations, successfully reduced inbreeding and enhanced overall genetic diversity.
- These findings support the continued use of genetically managed rhesus macaques for HIV/AIDS research.
