Julia Kardon Joins Biochemistry as Assistant Professor

Julia Kardon has joined the Department of Biochemistry as an assistant professor.  Her research addresses the molecular mechanisms that control the activity and quality of mitochondrial proteins to match the dynamic needs of eukaryotic cells. She discovered that a mitochondrial chaperone (ClpX) activates a conserved biosynthetic enzyme through partial unfolding. This discovery poses testable models for how protein unfolding can be controlled and limited and thus how protein unfoldases can direct diverse transformations of their substrates. Her lab will employ diverse biochemical and biophysical approaches to delineate molecular mechanisms of chaperone-mediated control of mitochondrial protein activity, in combination with cell biological, genetic, and proteomic tools to discover new components of mitochondrial protein regulation and quality control.

Julia performed her postdoctoral research with Tania Baker at MIT. She received a Ph.D. in Cell Biology from the University of California, San Francisco with Ron Vale and a B.S. in Molecular Biophysics and Biochemistry from Yale University.

Dilute-’N’-Go sequencing

Prof. Larry Wangh and his lab are interested in detecting changes in mitochondrial genomic sequences that result from aging, disease, or drugs.  To do this, they use LATE-PCR, an advanced form of asymmetric PCR, to detect mutations in the mitochondria by using multiplexes to study many mitochondrial genes at the same time.  LATE-PCR generates single DNA strands that are easily diluted for sequencing.  In the past. they have only been able to sequence one DNA strand from these multiplex reactions.

In a recent publication in Nucleic Acid Research, staff members Yanwei Jia and John Rice, along with Molecular and Cell Biology grad student Adam Osborne, describe the development of a blocking reagent that allows them to sequence both strands of the product DNA, thus allowing for the easy verification of mutations.

The figure at right shows that without a blocker (BLK), one is not able to obtain the excess (XP) strand sequence from a multiplex reaction.  Using a blocker one is able to get not only the limiting (LP) strand, but also the excess strand from the same multiplex

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