RGD Reference Report - Transport of fragile X mental retardation protein via granules in neurites of PC12 cells. - Rat Genome Database

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Transport of fragile X mental retardation protein via granules in neurites of PC12 cells.

Authors: De Diego Otero, Y  Severijnen, LA  Van Cappellen, G  Schrier, M  Oostra, B  Willemsen, R 
Citation: De Diego Otero Y, etal., Mol Cell Biol 2002 Dec;22(23):8332-41.
RGD ID: 628492
Pubmed: PMID:12417734   (View Abstract at PubMed)
PMCID: PMC134063   (View Article at PubMed Central)

Lack of fragile X mental retardation protein (FMRP) causes fragile X syndrome, a common form of inherited mental retardation. FMRP is an RNA binding protein thought to be involved in translation efficiency and/or trafficking of certain mRNAs. Recently, a subset of mRNAs to which FMRP binds with high affinity has been identified. These FMRP-associated mRNAs contain an intramolecular G-quartet structure. In neurons, dendritic mRNAs are involved in local synthesis of proteins in response to synaptic activity, and this represents a mechanism for synaptic plasticity. To determine the role of FMRP in dendritic mRNA transport, we have generated a stably FMR1-enhanced green fluorescent protein (EGFP)-transfected PC12 cell line with an inducible expression system (Tet-On) for regulated expression of the FMRP-GFP fusion protein. After doxycycline induction, FMRP-GFP was localized in granules in the neurites of PC12 cells. By using time-lapse microscopy, the trafficking of FMRP-GFP granules into the neurites of living PC12 cells was demonstrated. Motile FMRP-GFP granules displayed two types of movements: oscillatory (bidirectional) and unidirectional anterograde. The average velocity of the granules was 0.19 micro m/s with a maximum speed of 0.71 micro m/s. In addition, we showed that the movement of FMRP-GFP labeled granules into the neurites was microtubule dependent. Colocalization studies further showed that the FMRP-GFP labeled granules also contained RNA, ribosomal subunits, kinesin heavy chain, and FXR1P molecules. This report is the first example of trafficking of RNA-containing granules with FMRP as a core constituent in living PC12 cells.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
regulation of translation  TAS 628492 RGD 

Molecular Function
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
RNA binding  IDA 628492 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Fmr1  (fragile X messenger ribonucleoprotein 1)


Additional Information