Hypophosphatemia Regulates Molecular Mechanisms of Circadian Rhythm

Scientific Reports
Takashi NoguchiLouis C Gerstenfeld

Abstract

Transcriptomic analysis showed that the central circadian pathway genes had significantly altered expression in fracture calluses from mice fed a low phosphate diet. This led us to hypothesize that phosphate deficiency altered the circadian cycle in peripheral tissues. Analysis of the expression of the central clock genes over a 24-36 hour period in multiple peripheral tissues including fracture callus, proximal tibia growth plate and cardiac tissues after 12 days on a low phosphate diet showed higher levels of gene expression in the hypophosphatemia groups (p < 0.001) and a 3 to 6 hour elongation of the circadian cycle. A comparative analysis of the callus tissue transcriptome genes that were differentially regulated by hypophosphatemia with published data for the genes in bone that are diurnally regulated identified 1879 genes with overlapping differential regulation, which were shown by ontology assessment to be associated with oxidative metabolism and apoptosis. Network analysis of the central circadian pathway genes linked their expression to the up regulated expression of the histone methyltransferase gene EZH2, a gene that when mutated in both humans and mice controls overall skeletal growth. These data suggest that phos...Continue Reading

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Citations

Nov 16, 2019·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Joseph L Roberts, Hicham Drissi
Jun 27, 2019·Pflügers Archiv : European journal of physiology·Anders NordholmEwa Lewin

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Datasets Mentioned

BETA
GSE99580

Methods Mentioned

BETA
ELISA
Assay
targeted knockout

Software Mentioned

Expression Console
affyPLM R package
JMP Pro
JTK
_ CYCLE
affy R package
sva R package
R environment for
SAS

Related Concepts

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis

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