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Research in my lab focuses on RNA decay pathways. One pathway, called nonsense-mediated mRNA decay (NMD) or mRNA surveillance, surveys all newly synthesized mRNAs during what we call a "pioneer" round of translation. This round of translation involves mRNA that is associated with the cap-binding heterodimer CBP80 and CBP20. It is distinct from the type of translation that supports the bulk of cellular protein synthesis and involves a different cap-binding protein, eukaryotic initiation factor (eIF) 4E. Generally, if translation terminates more than 50-55 nt upstream of an exon-exon junction that is marked by the NMD factors Upf3 or Upf3X, Upf2 and ultimately Upf1, then the mRNA will be subject to NMD. By the time CBP80 and CBP20 have been replaced by eIF4E, the Upf mark has been removed so that mRNA is largely immune to NMD.
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Sami Barmada,Shulin Ju, Arpana Arjun, Anthony Batarse, Haiyan Qu,Eric Huang,Lynne Maquat,Greg Petsko, Steve Finkbeiner
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Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature (2010)
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