Lessard Lab

When the initial draft of the human genome was sequenced and released (2003) to researchers, many scientists thought it would immediately reveal the genetic basis for human disease. We soon realized that the human genome is much more complex than was ever imagined. Since then, technological advances have allowed us to evaluate thousands of genetic variants in large populations and conduct genome-wide association studies to identify which genes predispose a person to a particular disease or trait. More recently, we have entered a new era of affordable, rapid sequencing, which has provided scientists with unparalleled access to the high-quality, informative data needed to unravel the genetic relationships to human disease.

Not all diseases are created equal. Some diseases result from disruptions in a single gene, while others, including autoimmune diseases like lupus and Sjögren’s syndrome, are influenced by multiple genes. In autoimmunity, the immune system mistakenly recognizes self-molecules as foreign, leading to inflammatory processes and tissue damage to organs and worse prognosis if not treated. While the precise causes of autoimmune diseases are not fully known, it is well accepted that most arise from a complex interplay of multiple genetic risk factors and environmental triggers. Genetic studies in these diseases require international collaborations to assemble the large patient and healthy control populations needed to conduct large-scale genome-wide associations studies. To date researchers have identified more than 100 genes in lupus. In contrast, only 15 genes have been identified in Sjögren’s syndrome.  The disparity between Sjögren’s and lupus is largely due to the lack of large, well-characterized patient collections and the later age of disease onset.

My lab studies the genetics of autoimmune-related traits. Our goal is to understand the complex interactions between the elements of the human genome to identify new biomarkers and to develop therapeutics that will ultimately improve the lives of patients affected by these serious autoimmune disorders.

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