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2018 ; 19
(1
): 351
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Functional signaling and gene regulatory networks between the oocyte and the
surrounding cumulus cells
#MMPMID29747587
Biase FH
; Kimble KM
BMC Genomics
2018[May]; 19
(1
): 351
PMID29747587
show ga
BACKGROUND: The maturation and successful acquisition of developmental competence
by an oocyte, the female gamete, during folliculogenesis is highly dependent on
molecular interactions with somatic cells. Most of the cellular interactions
identified, thus far, are modulated by growth factors, ions or metabolites. We
hypothesized that this interaction is also modulated at the transcriptional
level, which leads to the formation of gene regulatory networks between the
oocyte and cumulus cells. We tested this hypothesis by analyzing transcriptome
data from single oocytes and the surrounding cumulus cells collected from antral
follicles employing an analytical framework to determine interdependencies at the
transcript level. RESULTS: We overlapped our transcriptome data with putative
protein-protein interactions and identified hundreds of ligand-receptor pairs
that can transduce paracrine signaling between an oocyte and cumulus cells. We
determined that 499 ligand-encoding genes expressed in oocytes and cumulus cells
are functionally associated with transcription regulation (FDR?0.05).
Ligand-encoding genes with specific expression in oocytes or cumulus cells were
enriched for biological functions that are likely associated with the coordinated
formation of transzonal projections from cumulus cells that reach the oocyte's
membrane. Thousands of gene pairs exhibit significant linear co-expression
(absolute correlation >?0.85, FDR?1.8?×?10(-?5)) patterns between oocytes and
cumulus cells. Hundreds of co-expressing genes showed clustering patterns
associated with biological functions (FDR?0.5) necessary for a coordinated
function between the oocyte and cumulus cells during folliculogenesis (i.e.
regulation of transcription, translation, apoptosis, cell differentiation and
transport). CONCLUSION: Our analyses revealed a complex and functional gene
regulatory circuit between the oocyte and surrounding cumulus cells. The
regulatory profile of each cumulus-oocyte complex is likely associated with the
oocytes' developmental potential to derive an embryo.