Shengdar Tsai Lab

Specifically, our laboratory is working on protein engineering to improve the properties of CRISPR/Cas9 genome editors, including the overall activities of the editors and the specificity and precision of potential edits. Our work on fundamental genome editing technologies explores strategies for expanding the targeting range of gene editing while maintaining the activity of the editors in order to precisely change disease-causing mutations of interest.

As we explore technological advances to genome editors, our laboratory is simultaneously studying the safety of genome editing, particularly unintended off-target effects. As part of the NIH Somatic Cell Genome Editing Program, we are investigating the biological consequences of intended and unintended genome editing activities.  

Our laboratory also has a translational line of research that focuses on editing hematopoietic stems cells in order to introduce fetal hemoglobin to treat patients with sickle cell disease. This work involves disruption of a repressor-binding site in human hematopoietic stems cells. By doing so, we can achieve about a 30% induction of fetal hemoglobin in the erythroid progeny of editing human HSCs mobilized from patients with sickle cell disease. This level of fetal hemoglobin is predicted to be sufficient to achieve therapeutic impact. We are collaborating with other investigators and teams at St. Jude, in part through the St. Jude Collaborative Research Consortium for Sickle Cell Disease (CRC-SCD), to advance this approach to a clinical trial.