Alternative 3'-end processing of long noncoding RNA initiates construction of nuclear paraspeckles.

ABSTRACT: Paraspeckles are unique subnuclear structures built around a specific long noncoding RNA, NEAT1, which is comprised of two isoforms produced by alternative 3'-end processing (NEAT1_1 and NEAT1_2). To address the precise molecular processes that lead to paraspeckle formation, we identified 35 paraspeckle proteins (PSPs), mainly by colocalization screening with a fluorescent protein-tagged full-length cDNA library. Most of the newly identified PSPs possessed various putative RNA-binding domains. Subsequent RNAi analyses identified seven essential PSPs for paraspeckle formation. One of the essential PSPs, HNRNPK, appeared to affect the production of the essential NEAT1_2 isoform by negatively regulating the 3'-end polyadenylation of the NEAT1_1 isoform. An in vitro 3'-end processing assay rev

SUBMITTER: Naganuma T 

PROVIDER: S-EPMC3474925 | biostudies-literature | 2012 Oct

REPOSITORIES: biostudies-literature