The invention concerns a recombinant adenoviral vector driving from an adenovirus genome at least by deleting all or part of the E1 region, said adenoviral vector comprising an expression cassette of a gene of interest placed under the control of elements necessary for its expression in a host cell or a host organism, said elements required for its expression including at least a splicing sequence. The invention is characterised in that said splicing sequence is derived from a eukaryotic nuclear gene selected among the ovalbumen genes, α or β-globine, collagen and factor VIII of mammals or a synthetic splicing sequence. The invention also concerns a host cell and an infectious viral particle comprising such a vector, a method for preparing such a particle and their therapeutic or prophylactic use. The invention further concerns a pharmaceutical composition containing said adenoviral vector, said host cell or said viral particle.