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2016 ; 48
(9
): 677-87
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Circadian variation of the pancreatic islet transcriptome
#MMPMID27495157
Rakshit K
; Qian J
; Ernst J
; Matveyenko AV
Physiol Genomics
2016[Sep]; 48
(9
): 677-87
PMID27495157
show ga
Pancreatic islet failure is a characteristic feature of impaired glucose control
in diabetes mellitus. Circadian control of islet function is essential for
maintaining proper glucose homeostasis. Circadian variations in transcriptional
pathways have been described in diverse cell types and shown to be critical for
optimization of cellular function in vivo. In the current study, we utilized
Short Time Series Expression Miner (STEM) analysis to identify diurnally
expressed transcripts and biological pathways from mouse islets isolated at 4 h
intervals throughout the 24 h light-dark cycle. STEM analysis identified 19
distinct chronological model profiles, and genes belonging to each profile were
subsequently annotated to significantly enriched Kyoto Encyclopedia of Genes and
Genomes biological pathways. Several transcriptional pathways essential for
proper islet function (e.g., insulin secretion, oxidative phosphorylation), cell
survival (e.g., insulin signaling, apoptosis) and cell proliferation (DNA
replication, homologous recombination) demonstrated significant time-dependent
variations. Notably, KEGG pathway analysis revealed "protein processing in
endoplasmic reticulum - mmu04141" as one of the most enriched time-dependent
pathways in islets. This study provides unique data set on time-dependent diurnal
profiles of islet gene expression and biological pathways, and suggests that
diurnal variation of the islet transcriptome is an important feature of islet
homeostasis, which should be taken into consideration for optimal experimental
design and interpretation of future islet studies.
|Animals
[MESH]
|Blood Glucose/metabolism
[MESH]
|Cell Proliferation/physiology
[MESH]
|Circadian Clocks/*physiology
[MESH]
|Circadian Rhythm/*physiology
[MESH]
|Gene Expression/physiology
[MESH]
|Homeostasis/physiology
[MESH]
|Islets of Langerhans/metabolism/*physiology
[MESH]