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The spliceosome is a large ribonucleoprotein complex responsible for pre-mRNA splicing and genome stability maintenance. Disruption of the spliceosome activity may lead to developmental disorders and tumorigenesis. However, the physiological role that the spliceosome plays in B cell development and function is still poorly defined. Here, we demonstrate that ubiquitin-specific peptidase 39 (Usp39), a spliceosome component of the U4/U6.U5 tri-snRNP complex, is essential for B cell development. Ablation of Usp39 in B cell lineage blocks pre-pro-B to pro-B cell transition in the bone marrow, leading to a profound reduction of mature B cells in the periphery. We show that Usp39 specifically regulates immunoglobulin gene rearrangement in a spliceosome-dependent manner, which involves modulating chromatin interactions at the Igh locus. Moreover, our results indicate that Usp39 deletion reduces the pre-malignant B cells in Eμ-Myc transgenic mice and significantly improves their survival.
X-linked agammaglobulinaemia (XLA) is the most common inherited humoural immunodeficiency disorder. Mutations in the gene coding for Bruton's tyrosine kinase (BTK) have been identified as the cause of XLA. Most affected patients exhibit a marked reduction of serum immunoglobulins, mature B cells, and an increased susceptibility to recurrent bacterial infections. However, the diagnosis of XLA can be a challenge in certain patients who have near-normal levels of serum immunoglobulin. Furthermore, reports on XLA with renal involvement are scant.
The Nucleic Acids Research Molecular Biology Database Collection is a public online resource that lists the databases described in this and previous issues of Nucleic Acids Research together with other databases of value to the biologist and available throughout the world. All databases included in this Collection are freely available to the public. The 2005 update includes 719 databases, 171 more than the 2004 one. The databases are organized in a hierarchical classification that simplifies the process of finding the right database for any given task. The growing number of databases related to immunology, plant and organelle research have been accommodated by separating them into three new categories. The database summaries provide brief descriptions of the databases, contact details, appropriate references and acknowledgements. The online summaries also serve as a venue for the maintainers of each database to introduce database updates and other improvements in the scope and tools. These updates are particularly important for those databases that have not been described in print in the recent past. The database list and summaries are available online at the Nucleic Acids Research web site, http://nar.oupjournals.org/.
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