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Updated: Jun 20, 2026

Artificial RNA Polymerase II Elongation Complexes for Dissecting Co-transcriptional RNA Processing Events
Published on: May 13, 2019
Transcription elongation factor ELL2 directs immunoglobulin secretion in plasma cells by stimulating altered RNA
Kathleen Martincic1, Serkan A Alkan, Alys Cheatle
1University of Pittsburgh, School of Medicine, Department of Immunology, Pittsburgh, Pennsylvania, USA.
Abstract:
Immunoglobulin secretion is modulated by competition between the use of a weak promoter-proximal poly(A) site and a nonconsensus splice site in the final secretory-specific exon of the heavy chain pre-mRNA. The RNA polymerase II transcription elongation factor ELL2, which is induced in plasma cells, enhanced both polyadenylation and exon skipping with the gene encoding the immunoglobulin heavy-chain complex (Igh) and reporter constructs. Lowering ELL2 expression by transfection of heterogenous ribonucleoprotein F (hnRNP F) or small interfering RNA resulted in lower abundance of secretory-specific forms of immunoglobulin heavy-chain mRNA. ELL2 and the polyadenylation factor CstF-64 tracked together with RNA polymerase II across the Igh mu- and gamma-gene segments; the association of both factors was blocked by ELL2-specific small interfering RNA. Thus, loading of ELL2 and CstF-64 on RNA polymerase II was linked, caused enhanced use of the proximal poly(A) site and was necessary for processing of immunoglobulin heavy-chain mRNA.
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