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Genetic analysis of HIV-1 samples from Spain
C Casado1, I Urtasun, M V Martín-Walther
1Centro Nacional de Biología Fundamental, Instituto de Salud Carlos III, Majadahonda, Madrid, Spain.
Journal of Acquired Immune Deficiency Syndromes (1999)
|March 9, 2000
Summary
Genetic analysis of HIV-1 in Spain reveals a single introduction of subtype B, suggesting a long-evolving epidemic. The study tracked viral evolution over time, indicating increasing genetic diversity.
Area of Science:
- Virology
- Epidemiology
- Genetics
Background:
- The human immunodeficiency virus type 1 (HIV-1) epidemic in Spain required genetic characterization to understand its origins.
- Understanding viral subtypes and their introduction is crucial for public health interventions.
Purpose of the Study:
- To genetically characterize HIV-1 samples from Spanish patients to understand the epidemic's structure.
- To determine the origin and evolutionary dynamics of HIV-1 in Spain.
Main Methods:
- Nucleotide sequencing of the C2-V3-C3 region of HIV-1.
- Phylogenetic analysis of 79 viral samples from diverse risk groups and regions in Spain.
Main Results:
- All analyzed samples were HIV-1 subtype B, except for one clade F isolate.
- No geographic or risk-group segregation was observed, indicating a single viral population.
- Phylogenetic analysis supported a single introduction of HIV-1 subtype B into Spain.
- A mean genetic distance of 13.9% among subtype B sequences suggests a long evolutionary history.
- An estimated divergence rate of 0.49% per year was calculated, with increasing genetic heterogeneity over time.
Conclusions:
- The HIV-1 epidemic in Spain likely originated from a single introduction event of subtype B.
- The observed genetic diversity and divergence rate indicate a long and evolving epidemic.
- These findings are critical for tracing the epidemic's history and informing future control strategies.