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Human immunodeficiency virus type 1 variability and long-term non-progression.
U Visco-Comandini1, S Aleman, Z Yun
1National Institute for Infectious Diseases Lazzaro Spallanzani-IRCCS, Rome, Italy.
Journal of Biological Regulators and Homeostatic Agents
|November 6, 2001
Summary
Human Immunodeficiency Virus type 1 (HIV-1) exhibits high genetic diversity within individuals. Long-term nonprogressors show similar intra-sample variation but lower inter-individual diversity compared to progressors.
Area of Science:
- Virology
- Immunology
- Genetics
Background:
- Human Immunodeficiency Virus type 1 (HIV-1) displays significant genetic heterogeneity in vivo, both between and within infected individuals.
- Viral evolution is influenced by host immune pressure, particularly during primary infection, leading to increased diversity over time.
Purpose of the Study:
- To investigate and compare the genetic heterogeneity of HIV-1 in long-term nonprogressors (LTNP) versus progressor patients.
- To analyze viral evolution over a four-year period in an LTNP to identify factors modulating HIV-1 diversity.
Main Methods:
- Analysis of viral heterogeneity in the nef gene and long terminal repeat (LTR) regions of HIV-1.
- Comparison of intra-sample and inter-individual genetic diversity between 12 Italian and Swedish LTNP and 8 progressor patients.
Main Results:
- Intra-sample HIV-1 variations in LTNP were comparable to those observed in progressor patients.
- Lower inter-individual HIV-1 diversity was found in LTNP compared to progressors.
- One LTNP exhibited minimal viral evolution over four years, suggesting non-immune factors influence diversity.
Conclusions:
- Host immune pressure may not be the sole driver of intra- and inter-sample HIV-1 diversity.
- Factors beyond immune pressure significantly modulate viral evolution and heterogeneity in long-term nonprogressors.
- Further research is needed to elucidate the mechanisms underlying reduced viral evolution in some LTNP.