Abstract：
:The transforming growth factor beta (TGFβ) related signaling is one of the most important signaling pathways regulating early developmental events. Smad2 and Smad3 are structurally similar and it is mostly considered that they are equally important in mediating TGFβ signals. Here, we show that Smad3 is an insensitive TGFβ transducer as compared with Smad2. Smad3 preferentially localizes within the nucleus and is thus sequestered from membrane signaling. The ability of Smad3 in oligomerization with Smad4 upon agonist stimulation is also impaired given its unique linker region. Smad2 mediated TGFβ signaling plays a crucial role in epiblast development and patterning of three germ layers. However, signaling unrelated nuclear localized Smad3 is dispensable for TGFβ signaling-mediated epiblast specification, but important for early neural development, an event blocked by TGFβ/Smad2 signaling. Both Smad2 and Smad3 bind to the conserved Smads binding element (SBE), but they show nonoverlapped target gene binding specificity and differential transcriptional activity. We conclude that Smad2 and Smad3 possess differential sensitivities in relaying TGFβ signaling and have distinct roles in regulating early developmental events.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Liu L,Liu X,Ren X,Tian Y,Chen Z,Xu X,Du Y,Jiang C,Fang Y,Liu Z,Fan B,Zhang Q,Jin G,Yang X,Zhang Xdoi
10.1038/srep21602subject
Has Abstractpub_date
2016-02-24 00:00:00pages
21602issn
2045-2322pii
srep21602journal_volume
6pub_type
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