The present invention relates to consensus nucleotide and protein sequences for HIV-1 Clade A antigens, and to nucleotide and protein sequences for Clade A antigens from circulating HIV-1 field isolates wherein the antigen sequences are closely related to the these consensus sequences. Advantageously, the present invention relates to HIV-1 Clade A transgenes that are derived from such sequences, and that encode either HIV-1 Clade A Gag, Pol (RT and Int), and Nef (collectively “GRIN”), HIV-1 Clade A Gag, RT, and Nef (collectively “GRN”), or HIV-1 Clade A Env. The invention also relates to vectors containing such transgenes, including adenovirus vectors containing such transgenes. The invention also relates to immunogenic compositions comprising the HIV-1 Clade A antigens, nucleotide sequences, vectors, or transgenes of the invention, and to methods of generating an immune response against HIV in a subject by administering an effective amount of such immunogenic compositions.
