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2018 ; 13
(7
): e0200466
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Atlas of tissue- and developmental stage specific gene expression for the bovine
insulin-like growth factor (IGF) system
#MMPMID30001361
Ghanipoor-Samami M
; Javadmanesh A
; Burns BM
; Thomsen DA
; Nattrass GS
; Estrella CAS
; Kind KL
; Hiendleder S
PLoS One
2018[]; 13
(7
): e0200466
PMID30001361
show ga
The insulin-like growth factor (IGF) axis is fundamental for mammalian growth and
development. However, no comprehensive reference data on gene expression across
tissues and pre- and postnatal developmental stages are available for any given
species. Here we provide systematic promoter- and splice variant specific
information on expression of IGF system components in embryonic (Day 48), fetal
(Day 153), term (Day 277, placenta) and juvenile (Day 365-396) tissues of
domestic cow, a major agricultural species and biomedical model. Analysis of
spatiotemporal changes in expression of IGF1, IGF2, IGF1R, IGF2R, IGFBP1-8 and IR
genes, as well as lncRNAs H19 and AIRN, by qPCR, indicated an overall increase in
expression from embryo to fetal stage, and decrease in expression from fetal to
juvenile stage. The stronger decrease in expression of lncRNAs (average -16-fold)
and ligands (average -12.1-fold) compared to receptors (average -5.7-fold) and
binding proteins (average -4.3-fold) is consistent with known functions of IGF
peptides and supports important roles of lncRNAs in prenatal development.
Pronounced overall reduction in postnatal expression of IGF system components in
lung (-12.9-fold) and kidney (-13.2-fold) are signatures of major changes in
organ function while more similar hepatic expression levels (-2.2-fold) are
evidence of the endocrine rather than autocrine/paracrine role of IGFs in
postnatal growth regulation. Despite its rapid growth, placenta displayed a more
stable expression pattern than other organs during prenatal development.
Quantitative analyses of contributions of promoters P0-P4 to global IGF2
transcript in fetal tissues revealed that P4 accounted for the bulk of transcript
in all tissues but skeletal muscle. Demonstration of IGF2 expression in fetal
muscle and postnatal liver from a promoter orthologous to mouse and human
promoter P0 provides further evidence for an evolutionary and developmental shift
from placenta-specific P0-expression in rodents and suggests that some aspects of
bovine IGF expression may be closer to human than mouse.