Abstract: This invention provides a transgenic mouse capable of expressing at least two cell surface membrane proteins of human T lymphocytes, transgenes for use in production of the transgenic mouse, and a method for producing the transgenic mouse using the transgenes. The cell surface membrane proteins of human T lymphocytes are associated particularly with human immunodeficiency virus (HIV) infection, and are preferably human CD4 and fusin (CXCR4). The transgenic mouse is able to inherit to its progeny a trait of expressing the cell surface membrane proteins of human T lymphocytes, thus being useful for an animal model for HIV infection and AIDS.

Abstract: The invention provides transgenic non-human animals and transgenic non-human mammalian cells having at least one functionally disrupted lymphocyte transduction locus, particularly a CD4 locus, targeting constructs used to produce such transgenic stem cells and animals, methods and targeting constructs for inactivating or suppressing expression of endogenous lymphocyte transduction gene loci, transgenes encoding heterologous lymphocyte transduction proteins, and nonhuman animals that express a human lymphocyte transduction protein and lack expression of a cognate murine lymphocyte transduction protein.