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Calendar Name: seminars
Scheduled for: Tuesday, May 10 2011, 11:00 - 12:30
Event text:    Dr Keiko Sugimoto
	       
	       RIKEN Plant Science Center
	       
	       Tsurumi, Yokohama
	       JAPAN
Details:       “Transcriptional control of plant cell dedifferentiation
	       by WIND1”
	       
	       ABSTRACT
	       Many multicellular organisms have a remarkable capacity
	       to regenerate new organs after wounding. As a first step
	       of organ regeneration, adult somatic cells often
	       dedifferentiate to reacquire cell proliferation
	       potential but mechanisms underlying this control remain
	       unknown in plants. We have recently shown that an
	       AP2/ERF transcription factor WOUND-INDUCED
	       DEDIFFERENTIATION 1 (WIND1) participates in the
	       regulation of cell dedifferentiation in Arabidopsis
	       (Iwase et al. 2011). WIND1 is rapidly induced at the
	       wound site and it promotes cell dedifferentiation and
	       subsequent formation of callus, a mass of pluripotent
	       cells. We further demonstrate that ectopic
	       overexpression of WIND1 is sufficient to establish and
	       maintain the dedifferentiated status of somatic cells
	       without exogenous auxin and cytokinin. An in vivo
	       imaging of a synthetic cytokinin reporter reveals that
	       wounding up-regulates the B-type ARABIDOPSIS RESPONSE
	       REGULATOR (ARR)-mediated cytokinin response and that
	       WIND1 acts via the ARR-dependent signaling pathway to
	       promote cell dedifferentiation. Discovery of WIND1
	       provides a new molecular basis to further dissect how
	       transcriptional regulators reprogram cellular
	       differentiation status in plants. 
	       
	       Iwase A et al. The AP2/ERF transcription factor WIND1
	       controls cell dedifferentiation in Arabidopsis. Curr
	       Biol 21: 508-514 (2011)

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