Identification of IL2RG and CYBB mutations in two Chinese primary immunodeficiency patients by whole-exome sequencing

Abstract

Background: Primary immunodeficiency diseases are a group of genetic disorders that lead to increased propensity to a variety of infections, sometimes with fatal outcomes.

Method: In this study, whole-exome sequencing (WES) was used to identify mutations in two patients suspected of having primary immunodeficiency. Sanger sequencing was used to confirm the results in the patients and their family.

Result: One patient was diagnosed as X-linked severe combined immunodeficiency (X-SCID) and another patient as X-linked chronic granulomatous disease (X-CGD) by WES. Sequencing analysis of IL2RG gene revealed a novel mutation (c.794T>A, p.I265N) and CYBB gene revealed a missense mutation (c.935T>A, p.M312K).

Discussion and conclusion: This study identifies one novel mutation in the IL2RG gene and another, previously described mutation in the CYBB genes. It is the first report establishing a diagnosis of X-SCID and X-CGD using WES in Chinese patients.

Keywords: CYBB; IL2RG; X-CGD; X-SCID; primary immunodeficiency; whole-exome sequencing.