Plenge Lab
Date posted: April 3, 2013 | Author: | No Comments »

Categories: Drug Discovery Human Genetics Immunogenomics

This blog post pertains to the Systems Immunology graduate course at Harvard Medical School (Immunology 306qc; see here), which is led by Drs. Christophe Benoist, Nick Haining and Nir Hacohen.  My lecture is on the role of human genetics as a tool for understanding the human immune system in health and disease.  What follows is an informal description of my lecture.  The slide deck for the lecture can be downloaded here.  Throughout, I have added key references, with links to the manuscripts and other web-based resources embedded within the blog (and also listed at the end).  I highlight five key manuscripts (#1, #2, #3, #4, and #5), which should be reviewed prior to the lecture; the other references, while interesting, are optional.

Overview

It is increasingly clear that humans serve as the best model organism for understanding human health and disease.  One reason for this paradigm shift is the lack of fidelity of most animal models to human disease.  For systems immunology, the mouse is a powerful model organism to understand fundamental mechanisms of the immune system.  However, studies in humans are required to understand how these mechanisms can be translated into new biomarkers and drugs.…

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I read with interest a recent publication by Khandpur et al in Science Translational Medicine on NETosis in the pathogenesis of rheumatoid arthritis (download PDF here).  It made me think about “cause vs consequence” in scientific discovery.  That is, how does one determine whether a biological process observed in patients with active disease is a cause of disease rather than a consequence of disease?

In reading the article, I learned about how neutrophils cause tissue damage and promote autoimmunity through the aberrant formation of neutrophil extracellular traps (NETs).  Released via a novel form of cell death called NETosis, NETs consist of a chromatin meshwork decorated with antimicrobial peptides typically present in neutrophil granules.  (Read more about NETs on Wikipedia here.) 

Mendelian randomization is a method of using measured variation in genes of known function to examine the causal effect of a modifiable exposure on disease in non-experimental studies (read more here).  It is a powerful to determine if an observation in patients is causal.  For example, if autoantibodies are pathogenic in RA, then DNA variants that influence the formation of autoantibodies should also be associated with risk of RA.  This is indeed the case, as exemplified by variants in a gene, PADI4, the codes for an enzyme involved in peptide citrullination (see here). …

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