Michael Fox, Ph.D.
Associate Professor, Virginia Tech Carilion Research Institute
Director, Center for Developmental and Translational Neurobiology
Associate Professor, Biological Sciences, College of Science, Virginia Tech
Associate Professor, Department of Pediatrics, Virginia Tech Carilion School of Medicine
Synapses are specialized sites that allow information to be passed between neurons. Their importance is highlighted by the fact that even minor synaptic abnormalities, caused by disease or neurotrauma, result in devastating neurological conditions. Understanding how CNS synapses are formed is therefore essential to our understanding of neurological disorders. The Fox Laboratory is interested in understanding the cellular and molecular mechanisms that drive two aspects of synapse formation—synaptic targeting and synaptic differentiation.
Researchers in the Fox Laboratory focus on the visual system in their efforts to uncover mechanisms that drive the initial targeting of synapses. The scientists are interested in understanding how synapses are formed between retinal ganglion cells (RGCs), the output neurons of the retina, and target neurons within the brain. Despite monumental advances in this field, it still remains unclear how different classes of RGCs—of which there are more than 22—target functionally distinct nuclei within the brain. One brain region where class-specific targeting of RGC axons is most evident is the LGN—a thalamic relay nucleus that contains three structurally and functionally distinct subnuclei. Since different classes of RGCs target these subnuclei, the researchers hypothesized that regionalized guidance cues must exist to direct class-specific axonal targeting. Fox and his team have now identified candidate molecules that may act as targeting cues for class-specific retinal targeting and are now testing their necessity in retinogeniculate circuit formation.
Once synaptic partners have correctly targeted each other, both sides of the synapse must exchange developmental relevant signals that transform this immature connection into a functioning synapse (a process called synaptic differentiation). Fox is specifically interested in identifying such trans-synaptic organizing cues in the mammalian brain. Fox is particularly interested in the role of extracellular matrix molecules and growth factors in this process. Previous studies from the Fox Laboratory identified roles for these classes of molecules in coordinating synaptic differentiation at the neuromuscular junction—a large peripheral synapse between motoneurons and muscle fibers. Based upon the bio-activities of these extracellular cues at the neuromuscular junction, the researchers are now asking whether similar cues are necessary and sufficient to induce the formation of brain synapses.
For a more complete listing of Michael Fox's publications, visit PubMed.
Education and Training
- Harvard University: Postdoctoral fellowship
- Virginia Commonwealth University: PhD, Anatomy
- College of William and Mary: BS, Chemistry
- Virginia Commonwealth University Medical Campus
Assistant Professor, Department of Anatomy and Neurobiology
- The College of William and Mary
Adjunct Professor, Department of Kinesiology
Awards and Honors
- Young Scientist Lectureship Award, International Society for Neurochemistry, 2015
- NARSAD Independent Investigator, Brain Behavior Research Foundation, 2015
- Jordi Folch-Pi Award, American Society for Neurochemistry, 2013
- Young Investigator Award, International Society for Neurochemistry Annual Meeting, 2011
- Marian Kies Award, American Society for Neurochemistry, 2004
- University Leadership Award, Virginia Commonwealth University, 2003
- H.L. Osterud Award, Department of Anatomy and Neurobiology, Virginia Commonwealth University, 2003
- F31 NIH Pre-Doctoral Fellowship, 2002
- Travel Award, American Society for Cell Biology, 2002
- Young Investigator Educational Enhancement Award, American Society of Neurochemistry, 2002
- Jack Denning Burke Award in Cell Biology, Department of Anatomy, Virginia Commonwealth University, 2002
- C.C. Clayton Award, Department of Anatomy, Virginia Commonwealth University, 2001
- Election into Mortar Board Honor and Service Society, The College of William and Mary, 1999
- West Point (USMA) Scholar Athlete Award, 1997
- Patriot League Scholar Athlete Award, 1997
- Monavarfeshani A, Knill CN, Sabbagh U, Su J, Fox MA. (2017). Region- and Cell-Specific Expression of Transmembrane Collagens in Mouse Brain. Frontiers in Integrative Neuroscience.
- Monavarfeshani A, Sabbagh U, Fox MA. (2017). Not a one-trick pony: Diverse connectivity and functions of the rodent lateral geniculate complex. Visual Neuroscience 34.
- Brooks JM, Carillo GL, Su J, Lindsey D, Fox MA, Blader I. (2015). Toxoplasma gondii Infections Alter GABAergic Synapses and Signaling in the Central Nervous System. mBIO 6(6).
- Hammer S, Lemon T, Monavarfeshani A, Su J, Fox MA. (2015). Multiple Retinal Axons Converge onto Relay Cells in the Adult Mouse Thalamus. Cell Reports 12(10): 1575-83.
- El-Danaf R, Seabrook T, Krahe T, Fox MA, Guideo W. (2015). Developmental remodeling of relay cells in the dorsal lateral geniculate nucleus in the absence of retinal input. Neural Development 10(1): 19.
- Chavan V, Willis J, Walker SK, Clark HR, Lui X, Fox MA, Srivastava S, Mukherjee K. (2015). Central presynaptic terminals are enriched in ATP but the majority lack mitochondria. PLoS ONE 10(4).
- Levy C, Brooks JM, Chen J, Su J, Fox MA. (2015). Cell-specific and developmental expression of lectican-cleaving proteases in mouse hippocampus and neocortex. Journal of Comparative Neurology 523(4): 629-48.
- Hammer S, Carrillo G, Govindaiah G, Monavarfeshani A, Bircher JS, Su J, Guido W, Fox MA. (2014). Nuclei-specific differences in nerve terminal distribution, morphology, and development in mouse visual thalamus. Neural Development 9(1): 16.
- Brooks JM, Su J, Levy C, Wang JS, Seabrook TA, Guido W, Fox MA. (2013). A molecular mechanism regulating the timing of corticogeniculate innervation. Cell Reports 5(3): 573-81.
- Su J, Klemm MA, Josephson AM, Fox MA. (2013). Contributions of VLDLR and LRP8 in the establishment of retinogeniculate projections. Neural Dev 8: 11.