Stephen G. Kaler, M.D.

Senior Investigator

Section on Translational Neuroscience

NICHD/DIR

35A 2D971
20892-3754

301-451-6034

sgk@box-s.nih.gov

Research Topics

Mechanisms of and Remedies for Neurometabolic Disorders

The Kaler Laboratory is committed to identifying genetic causes for copper transport diseases, understanding how the responsible genes participate in neurologic processes, dissecting disease mechanisms, and using this knowledge to improve health through rational treatments, including gene therapy. Patients and families affected by inherited neurometabolic disorders provide the impetus for scientific inquiry. In addition to molecular genetics, the laboratory employs model organisms (yeast, mouse, zebrafish), cellular, biochemical, and biophysical approaches, and human clinical trials. Cerebrospinal fluid-directed adeno-associated virus (AAV) gene therapy for Menkes disease and lysosomal storage diseases represent our current main directions. Using biochemical and cell biological techniques, we are also working to distinguish the mechanisms responsible for normal copper transport activity and intracellular trafficking of ATP7A and ATP7B, closely related copper-transporting ATPases.

Biography

Stephen Kaler completed his undergraduate studies at Boston College and received a M.D. from the University of Rochester (NY). He obtained clinical training in internal medicine and pediatrics in Boston before coming to NIH for fellowship in medical genetics and became board-certified in clinical genetics, biochemical genetics, and molecular genetics. He identified the molecular basis for the copper transport disorder occipital horn syndrome (Nature Genetics 8:195-202, 1994) and, with international collaborators, delineated several other conditions affecting copper homeostasis. These include ATP7A-related isolated distal motor neuropathy (Am J Hum Genet 86:343-352, 2010), and unique syndromes caused by mutations in SLC33A1, an acetylCoA transporter (Am J Hum Genet 90:61–68, 2012), and CCS, a copper chaperone (Hum Mutat 33:1207-1215, 2012). His laboratory illuminated the mechanisms underlying ATP7A–related motor neuron degeneration, establishing a link between genetically distinct forms of motor neuron disease, and highlighting the role of ATP7A in the peripheral nervous system (Hum Mol Genet 21:1794-1807, 2012). Dr. Kaler pioneered early identification of infants at-risk for Menkes disease using plasma neurochemical measurements and his laboratory utilized a yeast complementation assay to develop a predictive test for responsiveness to copper treatment (N Engl J Med 358:605-614, 2008). Dr. Kaler leads a clinical service for patients with this illness and related disorders of copper metabolism at the NIH Clinical Center. The Kaler laboratory recently rescued a lethal mouse model of Menkes disease by brain-directed adeno-associated virus (AAV)-mediated gene augmentation (Molecular Therapy 19:2114–2123, 2011). Extension of these latter proof-of-concept investigations, in tandem with preclinical toxicology studies, will pave the way for a first-in-human gene therapy trial for Menkes patients with complete loss of function ATP7A genedefects.

Selected Publications

  1. Bandmann O, Weiss KH, Kaler SG. Wilson's disease and other neurological copper disorders. Lancet Neurol. 2015;14(1):103-13.

  2. Bhattacharjee A, Yang H, Duffy M, Robinson E, Conrad-Antoville A, Lu YW, Capps T, Braiterman L, Wolfgang M, Murphy MP, Yi L, Kaler SG, Lutsenko S, Ralle M. The Activity of Menkes Disease Protein ATP7A Is Essential for Redox Balance in Mitochondria. J Biol Chem. 2016;291(32):16644-58.

  3. Yi L, Kaler SG. Direct interactions of adaptor protein complexes 1 and 2 with the copper transporter ATP7A mediate its anterograde and retrograde trafficking. Hum Mol Genet. 2015;24(9):2411-25.

  4. Kaler SG. ATP7A-related copper transport diseases-emerging concepts and future trends. Nat Rev Neurol. 2011;7(1):15-29.

  5. Kaler SG. Microbial peptide de-coppers mitochondria: implications for Wilson disease. J Clin Invest. 2016;126(7):2412-4.


This page was last updated on July 12th, 2017