Novel Genetic Discoveries in Primary Immunodeficiency Disorders

Immunology has seen significant growth recently, particularly in diagnostic methods like genetic testing for primary immunodeficiency disorders (PIDD). Understanding of severe combined immunodeficiency (SCID) has improved with better newborn screening and genetic testing, allowing for early intervention like hematopoietic stem cell transplantation (HSCT) or gene therapy. While SCID's genetic causes were known, recent advancements have revealed new factors.
Combined immunodeficiency (CID) shares similarities with SCID but typically doesn't lead to fatal infections in infancy. Enhanced testing has unveiled genetic origins of various CIDs. Humoral immunodeficiencies, affecting B cell development and immunoglobulin production, often come with autoimmunity and T and NK cell impairments. Common variable immunodeficiency (CVID) is a prevalent humoral immunodeficiency with defects in antibody production. Advancements in DNA sequencing have broadened our understanding of primary immunodeficiencies, revealing defects impacting immune tolerance, T cell signaling, and responses. Autoinflammatory disorders, often associated with arthritis, have seen significant progress in genetic understanding. Continued improvement in genetic testing techniques promises further insights into PIDD's genetic basis.