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2017 ; 45
(11
): 6793-6804
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Essential role for non-canonical poly(A) polymerase GLD4 in cytoplasmic
polyadenylation and carbohydrate metabolism
#MMPMID28383716
Shin J
; Paek KY
; Ivshina M
; Stackpole EE
; Richter JD
Nucleic Acids Res
2017[Jun]; 45
(11
): 6793-6804
PMID28383716
show ga
Regulation of gene expression at the level of cytoplasmic polyadenylation is
important for many biological phenomena including cell cycle progression,
mitochondrial respiration, and learning and memory. GLD4 is one of the
non-canonical poly(A) polymerases that regulates cytoplasmic
polyadenylation-induced translation, but its target mRNAs and role in cellular
physiology is not well known. To assess the full panoply of mRNAs whose
polyadenylation is controlled by GLD4, we performed an unbiased whole genome-wide
screen using poy(U) chromatography and thermal elution. We identified hundreds of
mRNAs regulated by GLD4, several of which are involved in carbohydrate metabolism
including GLUT1, a major glucose transporter. Depletion of GLD4 not only reduced
GLUT1 poly(A) tail length, but also GLUT1 protein. GLD4-mediated translational
control of GLUT1 mRNA is dependent of an RNA binding protein, CPEB1, and its
binding elements in the 3? UTR. Through regulating GLUT1 level, GLD4 affects
glucose uptake into cells and lactate levels. Moreover, GLD4 depletion impairs
glucose deprivation-induced GLUT1 up-regulation. In addition, we found that GLD4
affects glucose-dependent cellular phenotypes such as migration and invasion in
glioblastoma cells. Our observations delineate a novel post-transcriptional
regulatory network involving carbohydrate metabolism and glucose homeostasis
mediated by GLD4.
|*Carbohydrate Metabolism
[MESH]
|*Polyadenylation
[MESH]
|Base Sequence
[MESH]
|Cell Line, Tumor
[MESH]
|Cell Movement
[MESH]
|Cytoplasm/metabolism
[MESH]
|Gene Expression Regulation
[MESH]
|Glucose Transporter Type 1/genetics/metabolism
[MESH]