Pediatrics


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  • John W. Day, MD, PhD

    John W. Day, MD, PhD

    Professor of Neurology and Neurological Sciences (Adult Neurology), of Pediatrics (Genetics) and, by courtesy, of Pathology
    On Partial Leave from 02/15/2026 To 10/18/2026

    Current Research and Scholarly InterestsOur Neuromuscular Division coordinates a comprehensive effort to conquer peripheral nerve and muscle disorders, including the muscular dystrophies, motor neuron disorders, neuromuscular junction abnormalities, and peripheral neuropathies. With patients and families foremost in mind, we have had success defining and combating these diseases, with research focused on identifying genetic causes, developing novel treatment, and maximizing patient function by optimizing current management.

  • Claudia Del Toro Runzer

    Claudia Del Toro Runzer

    Postdoctoral Scholar, Medical Genetics

    BioClaudia Del Toro Runzer is a postdoctoral scholar at Stanford University specializing in gene therapy and regenerative medicine. Her current research focuses on developing gene editing strategies for inherited disorders, including GNE myopathy and Gaucher disease. She works on advancing precision gene engineering approaches in human hematopoietic stem and progenitor cells and other clinically relevant cell types, with the goal of enabling safe and durable therapeutic correction.

    Dr. Del Toro Runzer earned her PhD in Tissue Engineering from the MERLN Institute for Technology-Inspired Regenerative Medicine at Maastricht University. Her doctoral research focused on chemically modified mRNA therapeutics for bone regeneration, where she investigated molecular design, intracellular trafficking, and biomaterial-assisted delivery systems to enhance protein expression and osteogenic outcomes. Her work resulted in multiple first-author publications in leading journals, including Advanced Functional Materials, Bone Research, Materials Today, and Molecular Therapy: Nucleic Acids.

    Prior to her PhD, she completed an M.Sc. in Regenerative Biology and Medicine at Technische Universität Dresden and a B.Sc. in Biotechnology Engineering at Instituto Tecnológico de Monterrey. Her international training spans Germany, the Netherlands, Mexico, and the United States, with research experience in organoid systems, tissue regeneration, biomaterials engineering, and microphysiological platforms.