Genetic Characteristics of Three Unique Recombinant Forms of HIV-1 in Yunnan, China

Area of Science:

• Virology
• Epidemiology
• Genetics

Background:

• Yunnan Province, China, is a region with a significant burden of HIV-1.
• Understanding the genetic diversity and evolution of HIV-1 is crucial for effective control strategies.

Purpose of the Study:

• To investigate the molecular epidemiology of HIV-1 in newly diagnosed Burmese patients in Dehong Prefecture, Yunnan.
• To characterize the genetic makeup and evolutionary patterns of HIV-1 strains in this population.

Main Methods:

• Amplification and sequencing of near full-length HIV-1 genomes from plasma samples.
• Phylogenetic and bootscanning analyses to determine genetic relationships and identify recombinant forms.

Main Results:

• Three HIV-1 near full-length genomes were sequenced from samples collected in 2017.
• Sequences indicated second-generation recombinant forms, potentially involving CRF07_BC, CRF83_cpx, and unique recombinant forms.
• One sequence exhibited a complex mosaic structure with fragments from CRF01_AE, subtype C, and subtype B, separated by multiple breakpoints.

Conclusions:

• Second-generation recombination of HIV-1 is actively occurring in Dehong, China.
• The emergence of increasingly complex HIV-1 recombinant forms highlights the need for systematic surveys.
• Immediate public health interventions are required to prevent further diversification and spread of complex HIV-1 strains.