AUTHOR=Nemoto Kazuki , Kawanami Toshinori , Hoshina Takayuki , Ishimura Masataka , Yamasaki Kei , Okada Satoshi , Kanegane Hirokazu , Yatera Kazuhiro , Kusuhara Koichi TITLE=Impaired B-Cell Differentiation in a Patient With STAT1 Gain-of-Function Mutation JOURNAL=Frontiers in Immunology VOLUME=11 YEAR=2020 URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2020.557521 DOI=10.3389/fimmu.2020.557521 ISSN=1664-3224 ABSTRACT=

Hypogammaglobulinemia is a rare complication of STAT1 gain-of-function (GOF) mutations. We report an adult patient diagnosed with hypogammaglobulinemia caused by B-cell depletion during the treatment of disseminated cryptococcosis. The patient carried the STAT1 GOF mutation (c.820C>T, p.R274W). The flow cytometric analysis of his bone marrow revealed that B-cell differentiation was blocked in the stages between pre-B1b and pre-B2 cells. On the other hand, his brother who carried the same mutation displayed normal B-cell counts, thereby indicating that the unrecognized variants in same or other gene might be associated with abnormal B-cell differentiation in the patients. In conclusion, impaired B-cell differentiation in the bone marrow can cause hypogammaglobulinemia in patients with STAT1 GOF mutations.