Jin performed her Ph.D. research at the University of California, Berkeley, on Drosophila embryonic pattern formation. She then completed her postdoctoral training at Massachusetts Institute of Technology. She began her assistant professor position at the University of California, Santa Cruz and is now a full professor of Neurobiology at UC San Diego. She was an investigator of the Howard Hughes Medical Institute from 2001 to 2017. The work in her lab has focused on understanding the molecular mechanisms controlling synapse formation and axon regeneration in Caenorhabditis elegans. In particular, they identified multiple roles of the DLK-1 MAP kinase cascade and became interested in the signaling network activated in response to neuronal stress.
Areas of Expertise (4)
NIH-NINDS Jacob Javits Neuroscience Investigator Award
Special Lecture, Society for Neuroscience, USA
Bauer Distinguished Guest Lecturer (Brandeis University)
Inaugural holder of the Junior Seau Foundation Endowed Chair in Traumatic Brain Injury at UC San Diego
Plenary Speaker, 20th International C. elegans conference
Keynote lecture, NSF-ADVANCE
Barbara McClintock Lecture, University of British Columbia, Vancouver, Canada
Keynote speaker, Neuroscience Research Day
Miller School of Medicine, University of Miami
UC Berkeley: Ph.D., Molecular Biology 1991
Beijing University: B.S., Cell Biology 1984
Media Appearances (3)
Worm Gene Screen Finds Link to Nerve Regeneration
“This came as a total surprise,” said Jin, Chair of the Section of Neurobiology, Division of Biological Sciences, and a member of the Department of Cellular and Molecular Medicine in UC San Diego’s School of Medicine. “piRNA wasn’t anywhere on our radar, but now we are convinced that it is a new pathway that functions in neurons and, with some work, could offer therapeutic targets for helping neurons do better against injury.”
Discovery offers new genetic pathway for injured nerve regeneration
UC San Diego Biological Sciences Assistant Project Scientist Kyung Won Kim, Professor Yishi Jin and their colleagues conducted a large-scale genetic screening in the roundworm C. elegans seeking ultimately to understand genetic influences that might limit nerve regrowth in humans. Unexpectedly, the researchers found the PIWI-interacting small RNA (piRNA) pathway--long believed to be restricted to function in the germline--plays an active role in neuron damage regeneration...
Endowed Chair Honoring Junior Seau Awarded to UCSD Brain Researcher
Times of San Diego
Yishi Jin, professor and chair of the Section of Neurobiology in the Division of Biological Sciences at UCSD, was awarded the inaugural chair in large part due to her work focusing on molecular genetic mechanisms underlying the development of the nervous system and regeneration of wounded nervous systems. “I am honored by this award and particularly grateful for the recognition of my work on the fundamental understanding of the genetic basis of cellular response to traumatic injury,” Jin said. “This endowed fund will give us freedom to test high-risk and high-reward ideas.”...
The DLK-1 kinase promotes mRNA stability and local translation in C. elegans synapses and axon regenerationCell
Yan, D., Wu, Z., Chisholm, A. D., and Jin, Y.
2009 Growth cone guidance and synaptic plasticity involve dynamic local changes in proteins at axons and dendrites. The Dual-Leucine zipper Kinase MAPKKK (DLK) has been previously implicated in synaptogenesis and axon outgrowth in C. elegans and other animals. Here we show that in C. elegans DLK-1 regulates not only proper synapse formation and axon morphology but also axon regeneration by influencing mRNA stability. DLK-1 kinase signals via a MAPKAP kinase, MAK-2, to stabilize the mRNA encoding CEBP-1, a bZip protein related to CCAAT/enhancer-binding proteins, via its 3'UTR. Inappropriate upregulation of cebp-1 in adult neurons disrupts synapses and axon morphology. CEBP-1 and the DLK-1 pathway are essential for axon regeneration after laser axotomy in adult neurons, and axotomy induces translation of CEBP-1 in axons. Our findings identify the DLK-1 pathway as a regulator of mRNA stability in synapse formation and maintenance and also in adult axon regeneration.
Regulation of a DLK-1 and p38 MAP kinase pathway by the ubiquitin ligase RPM-1 is required for presynaptic developmentCell
Nakata, K., Abrams, B., Grill, B., Goncharov, A., Huang, X., Chisholm, A. D., and Jin, Y.
2005 Synapses display a stereotyped ultrastructural organization, commonly containing a single electron-dense presynaptic density surrounded by a cluster of synaptic vesicles. The mechanism controlling subsynaptic proportion is not understood. Loss of function in the C. elegans rpm-1 gene, a putative RING finger/E3 ubiquitin ligase, causes disorganized presynaptic cytoarchitecture. RPM-1 is localized to the presynaptic periactive zone. We report that RPM-1 negatively regulates a p38 MAP kinase pathway composed of the dual leucine zipper-bearing MAPKKK DLK-1, the MAPKK MKK-4, and the p38 MAP kinase PMK-3. Inactivation of this pathway suppresses rpm-1 loss of function phenotypes, whereas overexpression or constitutive activation of this pathway causes synaptic defects resembling rpm-1(lf) mutants. DLK-1, like RPM-1, is localized to the periactive zone. DLK-1 protein levels are elevated in rpm-1 mutants. The RPM-1 RING finger can stimulate ubiquitination of DLK-1. Our data reveal a presynaptic role of a previously unknown p38 MAP kinase cascade.
Functional regeneration after laser axotomyNature
Yanik, M. F., Cinar, H., Cinar, H. N., Chisholm, A. D., Jin, Y., and Ben-Yakar, A.
2004 Understanding how nerves regenerate is an important step towards developing treatments for human neurological disease1, but investigation has so far been limited to complex organisms (mouse and zebrafish2) in the absence of precision techniques for severing axons (axotomy). Here we use femtosecond laser surgery for axotomy in the roundworm Caenorhabditis elegans and show that these axons functionally regenerate after the operation. Application of this precise surgical technique should enable nerve regeneration to be studied in vivo in its most evolutionarily simple form.
Regulation of presynaptic terminal organization by C. elegans RPM-1, a putative guanine nucleotide exchanger with a RING-H2 finger domainNeuron
Zhen, M., Huang, X., Bamber, B., and Jin, Y.
2000 Presynaptic terminals contain highly organized subcellular structures to facilitate neurotransmitter release. In C. elegans, the typical presynaptic terminal has an electron-dense active zone surrounded by synaptic vesicles. Loss-of-function mutations in the rpm-1 gene result in abnormally structured presynaptic terminals in GABAergic neuromuscular junctions (NMJs), most often manifested as a single presynaptic terminal containing multiple active zones. The RPM-1 protein has an RCC1-like guanine nucleotide exchange factor (GEF) domain and a RING-H2 finger. RPM-1 is most similar to the Drosophila presynaptic protein Highwire (HIW) and the mammalian Myc binding protein Pam. RPM-1 is localized to the presynaptic region independent of synaptic vesicles and functions cell autonomously. The temperature-sensitive period of rpm-1 coincides with the time of synaptogenesis. rpm-1 may regulate the spatial arrangement, or restrict the formation, of presynaptic structures.
The liprin protein SYD-2 regulates the differentiation of presynaptic termini in C. elegansNature
Zhen, M., and Jin, Y.
1999 At synaptic junctions, specialized subcellular structures occur in both pre- and postsynaptic cells. Most presynaptic termini contain electron-dense membrane structures, often referred to as active zones, which function in vesicle docking and release. The components of those active zones and how they are formed are largely unknown. We report here that a mutation in the Caenorhabditis elegans syd-2 (for synapse-defective) gene causes a diffused localization of several presynaptic proteins and of a synaptic-vesicle membrane associated green fluorescent protein (GFP) marker. Ultrastructural analysis revealed that the active zones of syd-2 mutants were significantly lengthened, whereas the total number of vesicles per synapse and the number of vesicles at the prominent active zones were comparable to those in wild-type animals. Synaptic transmission is partially impaired in syd-2 mutants. syd-2 encodes a member of the liprin (for LAR-interacting protein) family of proteins which interact with LAR-type (for leukocyte common antigen related) receptor proteins with tyrosine phosphatase activity (RPTPs). SYD-2 protein is localized at presynaptic termini independently of the presence of vesicles, and functions cell autonomously. We propose that SYD-2 regulates the differentiation of presynaptic termini in particular the formation of the active zone, by acting as an intracellular anchor for RPTP signalling at synaptic junctions.