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RNA-binding protein hnRNPLL regulates mRNA splicing and stability during B-cell to plasma-cell differentiation.

Proc. Natl. Acad. Sci. U.S.A.2015 Apr 14;112(15):E1888-97. Epub 2015 Mar 30
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摘要


Posttranscriptional regulation is a major mechanism to rewire transcriptomes during differentiation. Heterogeneous nuclear RNA-binding protein LL (hnRNPLL) is specifically induced in terminally differentiated lymphocytes, including effector T cells and plasma cells. To study the molecular functions of hnRNPLL at a genome-wide level, we identified hnRNPLL RNA targets and binding sites in plasma cells through integrated Photoactivatable-Ribonucleoside-Enhanced Cross-Linking and Immunoprecipitation (PAR-CLIP) and RNA sequencing. hnRNPLL preferentially recognizes CA dinucleotide-containing sequences in introns and 3' untranslated regions (UTRs), promotes exon inclusion or exclusion in a context-dependent manner, and stabilizes mRNA when associated with During differentiation of primary B cells to plasma cells, hnRNPLL mediates a genome-wide switch of RNA processing, resulting in loss of B-cell lymphoma 6 (Bcl6) expression and increased Ig production--both hallmarks of plasma-cell maturation. Our data identify previously unknown functions of hnRNPLL in B-cell to plasma-cell differentiation and demonstrate that the RNA-binding protein hnRNPLL has a critical role in tuning transcriptomes of terminally differentiating B lymphocytes.

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