To analyse the impact of specific genetic subtypes on the natural history of HIV-1 infection.
* To identify the genetic subtype circulating in three existing cohorts of HIV infected patients in Senegal, Cameroon and Guinea-Bissau; to study virological and antigenic characteristics related to the genotype.
* To identify risk factors associated to specific genotypes and to assess clinical, immunological and virological parameters as well as survival over 3 years period in HIV-1 infected patients according to genotypes.
The potential benefits of the proposed projects are multiple. A better clinical care of HIV infected patients is offered through a standardized approach and with the possibility to treat infections due to the immuno-depression.
This project consists on two parts:
First, a transversal study among ongoing cohorts of HIV infected patients in Senegal, Cameroon and Guinea-Bissau will allow to determine the prevalence of the different genotypes circulating in this populations and to characterize their virological properties. Both heteroduplex mobility assay (HMA) and V3 peptide serology will be used to diagnose the different genetic groups and subtypes of HIV-1. An algorithm will be developed to simplify the genetic subtyping of HIV-1. The biological phenotype will be analyzed and correlated with the genetic sequence of the V3 loop. Risk factors associated to genotypes will be analyzed.
Secondly, the possibility to perform a follow-up of HIV-infected patients in Senegal, Guinea-Bissau and Cameroon allows us to initiate a prospective study in order to assess clinical, immunological and virological parameters as well as survivial over a three year period. The biological phenotype will be determined every 6 months and correlated with CD4 counts and clinical parameters. Several clinical, serological, virological and immunological parameters will be studied in order to see if certain genotypes have a different pathogenesis and prognosis for HIV disease development.
Funding SchemeCSC - Cost-sharing contracts