The tumor suppressor Cdc73 functionally associates with CPSF and CstF 3' mRNA processing factors.
The CDC73 tumor suppressor gene is mutationally inactivated in hereditary and sporadic parathyroid tumors. Its product, the Cdc73 protein, is a component of the RNA polymerase II and chromatin-associated human Paf1 complex (Paf1C). Here, we show that Cdc73 physically associates with the cleavage and polyadenylation specificity factor (CPSF) and cleavage stimulation factor (CstF) complexes that are required for the maturation of mRNA 3' ends in the cell nucleus. Immunodepletion experiments indicate that the Cdc73-CPSF-CstF complex is necessary for 3' mRNA processing in vitro. Microarray analysis of CDC73 siRNA-treated cells revealed INTS6, a gene encoding a subunit of the Integrator complex, as an in vivo Cdc73 target. Cdc73 depletion by siRNA resulted in decreased INTS6 mRNA abundance, and decreased association of CPSF and CstF subunits with the INTS6 locus. Our results suggest that Cdc73 facilitates association of 3' mRNA processing factors with actively-transcribed chromatin and support the importance of links between tumor suppression and mRNA maturation.
Rozenblatt-Rosen
Orit
O
Department of Medical Oncology, Dana-Farber Cancer Institute, and Harvard Medical School, Boston, MA 02115, USA.
Nagaike
Takashi
T
Francis
Joshua M
JM
Kaneko
Syuzo
S
Glatt
Karen A
KA
Hughes
Christina M
CM
LaFramboise
Thomas
T
Manley
James L
JL
Meyerson
Matthew
M
D047369:Chromatin Immunoprecipitation; D002874:Chromosome Mapping; D039223:Cleavage And Polyadenylation Specificity Factor / Q000737:chemistry / Q000502:physiology*; D039241:Cleavage Stimulation Factor / Q000737:chemistry / Q000502:physiology*; D006801:Humans; D012333:RNA, Messenger / Q000378:metabolism*; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins / Q000235:genetics; D025521:Tumor Suppressor Proteins / Q000737:chemistry / Q000235:genetics / Q000502:physiology*
C454900:CDC73 protein, human; D039223:Cleavage And Polyadenylation Specificity Factor; D039241:Cleavage Stimulation Factor; C121427:INTS6 protein, human; D012333:RNA, Messenger; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins; D025521:Tumor Suppressor Proteins