W. Brad Ruzicka, MD, PhD

W. Brad Ruzicka, MD, PhD

McLean Hospital Title
Harvard Medical School Title
  • Assistant Professor of Psychiatry


W. Brad Ruzicka, MD, PhD, specializes in the clinical treatment and basic investigation of schizophrenia and bipolar disorder. Dr. Ruzicka provides direct patient care within multiple settings in the hospital’s Division of Psychotic Disorders.

Dr. Ruzicka’s research is focused on the role of epigenetics in the etiology and treatment of psychotic illnesses. Through analyses of postmortem human brain tissue, his work investigates the molecular mechanisms through which environmental exposures (physical illness, psychological stressors, chemical exposures) influence genes and cells within specified circuits of the brain. His work aims to explain the etiology of these illnesses, as well as to develop improved treatments for patients.

Research Focus:

Drawing on his background in molecular genetics, Dr. Ruzicka focuses on postmortem human brain tissue studies aimed at understanding the epigenetic changes that occur in single cells and single circuits in the pathology of psychotic disorders.

Unlike genetics, which studies the sequence of DNA (the sequence of A, T, C, and G nucleotides in one’s genes), epigenetics studies the way in which genes are packaged into chromosomes, which has a strong effect on their function. While the genes we inherit from our parents are stable over time and the same in every cell within a person’s body, epigenetic patterns are unique to each single cell within the body and variable across time and in response to environmental influences. Epigenetics forms the interface between the static genome and the dynamic environment, or, in more general terms, the interface between nature and nurture.

Dr. Ruzicka’s laboratory studies the ways in which epigenetic mechanisms act within the vast complexity of the brain and the large diversity of cell types in specific brain regions and circuits. He also conducts research on how disruption of these processes may lead to psychotic illness. Using a variety of techniques, including laser microdissection, single-cell genomics technologies, and advanced histological methods, Dr. Ruzicka investigates these mechanisms at the scale of individual cells and circuits, the resolution necessary to understand the workings of the human brain in health and disease.

Dr. Ruzicka studies these broad concepts within the GABAergic neurotransmitter system of the brain. GABAergic neurons are the most diverse group of neurons in the brain, and this system is known to play a prominent role in schizophrenia. Disrupted activity of populations of GABA neurons is thought to produce the cognitive symptoms of psychotic disorders that form the core of the dysfunction seen in these diseases, and for which current treatments are often ineffective. The long-term goal of Dr. Ruzicka’s laboratory is to define and localize schizophrenia-related epigenetic abnormalities in specific brain circuits and neuronal populations, leading to better treatments and improved outcomes for patients.

  • Daniel Reed, Research Assistant
  • Schahram Akbarian, MD, PhD, Icahn School of Medicine at Mount Sinai
  • Sabina Berretta, MD, McLean Hospital
  • Denise Faustman, MD, PhD, Massachusetts General Hospital
  • Manolis Kellis, PhD, Massachusetts Institute of Technology
  • Joshua Levin, PhD, The Broad Institute
  • Sivan Subburaju, PhD, McLean Hospital
Selected Publications:

Ruzicka WB, Zhubi A, Veldic M, Grayson DR, Costa E, Guidotti A. Selective epigenetic alteration of layer I GABAergic neurons isolated from prefrontal cortex of schizophrenia patients using laser-assisted microdissection. Molecular Psychiatry 2007;12(4): 385-397.

Ruzicka WB, Subburaju S, Benes FM. Circuit and diagnosis specific DNA methylation changes at GABA related genes in postmortem human hippocampus in schizophrenia and bipolar disorder. JAMA Psychiatry 2015;72(6):541-51.

Ruzicka WB, Subburaju S, Coyle JT, Benes FM. Location matters: distinct DNA methylation patterns in GABAergic interneuronal populations from separate microcircuits within the human hippocampus. Human Molecular Genetics 2018;27(2):254-265.

PubMed search for Dr. Ruzicka

Education & Training

  • 1999 BS in Biological Chemistry, University of Chicago
  • 2008 MD, University of Illinois
  • 2008 PhD in Biochemistry and Molecular Genetics, University of Illinois
  • 2008-2009 Medicine Internship, Newton-Wellesley Hospital
  • 2009-2012 Adult Psychiatry Residency, Massachusetts General Hospital/McLean Hospital
Board Certifications:
  • 2011 Medical License, Board of Registration in Medicine, Commonwealth of Massachusetts
  • 2012 Psychiatry, American Board of Psychiatry and Neurology


Phone: 617.855.3085
Office Address: Belmont campus - Mailman Research Center Room 118