Case Report: Whole exome sequencing identifies variation c.2308G>A p.E770K in RAG1 associated with B- T- NK+ severe combined immunodeficiency

Severe combined immunodeficiency is a large clinically heterogeneous group of disorders caused by a defect in the development of humoral or cellular immune responses. At least 13 genes are known to be involved in the pathophysiology of the disease and the mutation spectrum in SCID have been well documented. The widespread application of whole-exome sequencing based on next-generation sequencing has offered a new opportunity to systematically screen these genes in clinical scales. In this report, we describe the application of whole exome sequencing for arriving at a molecular diagnosis in a child suffering from B- T- NK+ severe combined immunodeficiency. Apart from making the accurate molecular diagnosis, we also add a genetic variation c.2308G>A p.E770K to the compendium of variations associated with the disease.