TRIM5alpha Modulates Immunodeficiency Virus Control in Rhesus Monkeys

Area of Science:

• Immunology
• Virology
• Genetics

Background:

• Cytoplasmic TRIM5alpha proteins restrict retroviral infection in a species-specific manner.
• Retroviruses evolve to evade host TRIM5alpha recognition.
• The role of TRIM5alpha in controlling lentiviral infections in natural hosts requires further investigation.

Purpose of the Study:

• To investigate the impact of TRIM5 polymorphisms in rhesus monkeys on simian immunodeficiency virus (SIV) infection.
• To determine if TRIM5alpha genetic variation influences SIV susceptibility and disease progression in vivo and in vitro.

Main Methods:

• Sequencing of full-length TRIM5alpha cDNAs from 79 rhesus monkeys.
• Assessing the association between TRIM5 alleles, in vitro cellular permissiveness to SIV, and in vivo clinical outcomes.
• Analyzing TRIM5alpha B30.2(SPRY) domain variation and its effect on SIVmac capsid binding.

Main Results:

• Natural variation in the TRIM5alpha B30.2(SPRY) domain affects SIVmac capsid binding and in vitro cellular susceptibility.
• Specific TRIM5 alleles are associated with significant differences in set-point viral loads (up to 1.3 median log).
• TRIM5alpha allelic forms correlate with the degree of central memory CD4+ T cell loss and the rate of AIDS progression.

Conclusions:

• TRIM5alpha plays a crucial role in limiting immunodeficiency virus replication in primate hosts.
• Genetic diversity in TRIM5alpha contributes to varying outcomes of SIV infection in rhesus macaques.
• TRIM5alpha polymorphisms are key determinants of SIV pathogenesis and disease progression.