Unknown,Transcriptomics,Genomics,Proteomics

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Chromatin immunoprecipitation profiling of human HEK293 cells transiantly transfected with plasmids coding for Staufen2-HA isoforms


ABSTRACT: In human cells, Staufen2 is a double-stranded RNA-binding protein involved in several cellular functions. Although 51% identical to Staufen1, these proteins are nevertheless found in different RNA particles. In addition, differential splicing events generate Staufen2 isoforms that only differ at their N-terminal extremities. We used a genome wide approach to identify and compare the mRNA targets of mammalian Staufen2 isoforms. The mRNA content of Staufen mRNPs was identified by probing DNA microarrays with probes derived from mRNAs isolated from immunopurified Staufen2-containing complexes following transfection of HEK293T cells with Stau2-HA (59kDa) or Stau2-HA (62kDa) expressors. Our results indicate that 11% of the cellular RNAs expressed in HEK293T cells are found in Stau2-containing mRNPs. There is a predominance of mRNAs involved in cell metabolism, transport, transcription, regulation of cell processes and catalytic activity. Experiment Overall Design: HEK293 cells were transiantly transfected with plasmids coding for Staufen2-HA isoforms. Cell extracts were immunoprecipitated using anti-HA antibodies and co-immunoprecipitated mRNAs were purified and used to hybridize microarrays. As control, cell extract from mock transfected cells were used.

ORGANISM(S): Homo sapiens

SUBMITTER: Luc DesGroseillers 

PROVIDER: E-GEOD-8437 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

A genome-wide approach identifies distinct but overlapping subsets of cellular mRNAs associated with Staufen1- and Staufen2-containing ribonucleoprotein complexes.

Furic Luc L   Maher-Laporte Marjolaine M   DesGroseillers Luc L  

RNA (New York, N.Y.) 20071219 2


Messenger RNAs are associated with multiple RNA-binding proteins to form ribonucleoprotein (mRNP) complexes. These proteins are important regulators of the fate of their target mRNAs. In human cells, Staufen1 and Staufen2 proteins, coded by two different genes, are double-stranded RNA-binding proteins involved in several cellular functions including mRNA localization, translation, and decay. Although 51% identical, these proteins are nevertheless found in different RNA particles. In addition, di  ...[more]

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