| First Author | Ott de Bruin LM | Year | 2018 |
| Journal | Blood | Volume | 132 |
| Issue | 3 | Pages | 281-292 |
| PubMed ID | 29743177 | Mgi Jnum | J:264758 |
| Mgi Id | MGI:6192913 | Doi | 10.1182/blood-2017-12-820985 |
| Citation | Ott de Bruin LM, et al. (2018) Hypomorphic Rag1 mutations alter the preimmune repertoire at early stages of lymphoid development. Blood 132(3):281-292 |
| abstractText | Hypomorphic RAG1 mutations allowing residual T- and B-cell development have been found in patients presenting with delayed-onset combined immune deficiency with granulomas and/or autoimmunity (CID-G/AI) and abnormalities of the peripheral T- and B-cell repertoire. To examine how hypomorphic Rag1 mutations affect the earliest stages of lymphocyte development, we used CRISPR/Cas9 to generate mouse models with mutations equivalent to those found in patients with CID-G/AI. Immunological characterization showed partial development of T and B lymphocytes, with persistence of naive cells and preserved serum immunoglobulin but impaired antibody responses and presence of autoantibodies, thereby recapitulating the phenotype seen in patients with CID-G/AI. By using high-throughput sequencing, we identified marked skewing of Igh V and Trb V gene usage in early progenitors, with a bias for productive Igh and Trb rearrangements after selection occurred and increased apoptosis of B-cell progenitors. Rearrangement at the Igk locus was impaired, and polyreactive immunoglobulin M antibodies were detected. This study provides novel insights into how hypomorphic Rag1 mutations alter the primary repertoire of T and B cells, setting the stage for immune dysregulation frequently seen in patients. |
