ࡱ> <>;_ RBbjbj 4>\>\   ttttt8  Z(N"""'''''''$*^->'-t"""""'tt4("Rtt'"'Iq? ta'*(0Z(i-F-qq-t """""""''"""Z(""""-""""""""" 4 :: Watching Single Endogenous mRNA in Neurons in vivo Hye Yoon Park Department of Physics & Astronomy, Seoul National University, Seoul 08826, Korea  HYPERLINK "mailto:hyeyoon.park@snu.ac.kr" hyeyoon.park@snu.ac.kr I will present how we could begin to understand single molecule biophysics of gene expression during brain activities. The dynamics of mRNA - the synthesis, transport, and degradation - plays significant roles in a variety of neuronal processes. Abnormal mRNA processing and transport are implicated in neurological disorders such as autism and Alzheimers disease. However, understanding the mechanistic roles of RNA dynamics has been hampered by the lack of techniques to observe the endogenous molecules in the native tissue environment. Here I will describe a novel systems approach, combining single-particle tracking, genetic engineering, and intravital microscopy. Using this technique, we found that multiple -actin mRNAs assemble together, travel by active transport, and disassemble upon KCl depolarization in cultured neurons+234ABH g s  $&(,.248:@Bſŵŗ{sosososo{h,vjh,vUh5=>hv+OCJOJPJaJo(Uh[(CJOJaJh*h5=>CJOJaJ hx POJh.?h5=>0JOJjh5=>OJU h8uOJ h5=>OJhqhx POJo( h5=>>*OJhqh8uCJOJo(h5=>h5=>56CJOJh5=>5CJOJ 4B&*,0268<>@BgdKOdhgd5=> $xa$gd5=> $xa$gdq $a$gdq$a$gdq. Two-photon imaging of live brain tissues revealed immediate-early induction of -actin transcription after neuronal stimulation. The technology as demonstrated in our work, including the transgenic strategy and high-resolution microscopy of living tissue, could be applied to other genes to gain insights into the dynamic regulation of gene expression within the cellular and tissue microenvironment.     21h:p3z. 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