Differential Clade-Specific HLA-B*3501 Association with HIV-1 Disease Outcome Is Linked to Immunogenicity of a Single Gag Epitope

作者：Matthews Philippa C; Koyanagi Madoka; Kloverpris Henrik N^*; Harndahl Mikkel; Stryhn Anette; Akahoshi Tomohiro; Gatanaga Hiroyuki; Oka Shinichi; Molina Claudia Juarez; Ponce Humberto Valenzuela; Rios Santiago Avila; Cole David; Carlson Jonathan; Payne Rebecca P; Ogwu Anthony; Bere Alfred; Ndung' u Thumbi; Gounder Kamini; Chen Fabian; Riddell Lynn; Luzzi Graz; Shapiro Roger; Brander Christian; Walker Bruce; Sewell Andrew K; Teran Gustavo Reyes; Heckerman David

来源：Journal of Virology, 2012, 86(23): 12643-12654.

DOI：10.1128/JVI.01381-12

The strongest genetic influence on immune control in HIV-1 infection is the HLA class I genotype. Rapid disease progression in B-clade infection has been linked to HLA-B*35 expression, in particular to the less common HLA-B*3502 and HLA-B*3503 subtypes but also to the most prevalent subtype, HLA-B*3501. In these studies we first demonstrated that whereas HLA-B*3501 is associated with a high viral set point in two further B-clade-infected cohorts, in Japan and Mexico, this association does not hold in two large C-clade-infected African cohorts. We tested the hypothesis that clade-specific differences in HLA associations with disease outcomes may be related to distinct targeting of critical CD8(+) T-cell epitopes. We observed that only one epitope was significantly targeted differentially, namely, the Gag-specific epitope NPPIPVGDIY (NY10, Gag positions 253 to 262) (P = 2 x 10(-5)). In common with two other HLA-B*3501-restricted epitopes, in Gag and Nef, that were not targeted differentially, a response toward NY10 was associated with a significantly lower viral set point. Nonimmunogenicity of NY10 in B-clade-infected subjects derives from the Gag-D260E polymorphism present in similar to 90% of B-clade sequences, which critically reduces recognition of the Gag NY10 epitope. These data suggest that in spite of any inherent HLA-linked T-cell receptor repertoire differences that may exist, maximizing the breadth of the Gag-specific CD8(+) T-cell response, by the addition of even a single epitope, may be of overriding importance in achieving immune control of HIV infection. This distinction is of direct relevance to development of vaccines designed to optimize the anti-HIV CD8(+) T-cell response in all individuals, irrespective of HLA type.

• 出版日期2012-12
• 单位Microsoft