SMAD, mothers against DPP homolog 2 Adenovirus (Ad-SMAD2)

Mammalian homologs of the Drosophila Mad gene include Smad1 (also designated Madr1 or JV4-1), Smad2 (also designated Madr2 or JV18-1), Smad3, Smad4 (also designated DPC4), Smad5, Smad6, Smad7 and Smad8 (also designated Smad9) . Smad1 and Smad5 are effectors of BMP2 and BMP4 function while Smad2 and Smad3 are involved in TGFb and activin-mediated growth modulation. Smad4 is required for all of the above activities and necessitates FAST-1 for DNA binding. Smad6 and Smad7 regulate the response to activin/ TGF-beta signaling by interfering with TGF-beta-mediated phosphorylation of other Smad family members.