Relationship To Other Viruses
All complex retroviruses face the problem of exporting unspliced and partially spliced mRNAs. Some use systems similar to Rev/RRE; these include HIV-2 and SIV (Simian Immunodeficiency Virus) which use their own Rev-RRE systems, some betaretroviruses, which use a Rem/RmRE system, and all deltaretroviruses which use a Rex/RxRRE systems.
Many simple retroviruses, most notably Mason–Pfizer monkey virus (MPMV), do not encode a Rev-like protein, but instead have evolved a cis-acting RNA element, the constitutive transport element (CTE), that directly binds to components of the host mRNA export machinery. The MPMV CTE is ~220 nucleotides and consists of two identical binding sites for the cellular export protein Tap. Tap directly binds the viral RNA and exports it to the cytoplasm.
Read more about this topic: HIV Rev Response Element
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