High resolution spatially resolved transcriptomic analysis of mouse pancreatic sections during embryonic development
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus musculus synthetic construct
PROVIDER: GSE290835 | GEO | 2025/10/09
REPOSITORIES: GEO
Dataset's files
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| GSE290835_RAW.tar | Raw | |||
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Project description:The pancreas is an endodermal organ with exocrine and endocrine cell compartments. The embryonic development of the pancreas relies on the the coordinated action of pancreatic progenitors and its surrounding microenvironments. The most abundant cell type of the pancreatic microenviroment are mesenchymal cells. These cells are known to contribute to the pancreas organ growth, morphogenesis and differentiation. In this study, we used single-cell RNA sequencing to molecularly characterize mesenchymal and pancreatic progenitor populations in the dorsal pancreas of the mouse embryos.
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Project description:The pancreas is an exocrine and endocrine endodermal organ involved in digestion and glucose homeostasis. During embryogenesis, the anlagen of the pancreas arise from dorsal and ventral evaginations of the foregut that later fuse to form a single organ. In order to better understand the molecular genetics of early pancreas development, we sought to isolate markers that are uniquely expressed in this tissue. Microarray analysis was performed comparing dissected pancreatic buds, liver buds, and the stomach region of tadpole stage Xenopus embryos. A total of 912 genes were found to be differentially expressed between these organs during early stages of organogenesis. K-means clustering analysis predicted 120 of these genes to be specifically enriched in the pancreas. Of these, we report on the novel expression patterns of 24 genes. Among them, STXBP6 and KIRREL2 were expressed by the early tailbud stage, suggesting the possible involvement of novel signaling pathways in early pancreas development. Keywords: organ type comparison
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Project description:Early postnatal overnutrition causes persistent dysregulation of endocrine pancreas function. We used genome-scale DNA methylation profiling in the suckling-period small litter (SL) mouse model to test whether this occurs via persistent epigenetic changes in pancreatic islets. Although SL islets showed DNA methylation changes directly after weaning and in adulthood, few of these were present at both ages, contrary to our hypothesis. Most interestingly, we discovered that genomic regions that are hypermethylated in exocrine relative to endocrine pancreas tend to gain methylation in islets during aging. Focusing on a subset of genes relevant to β cell function, we showed that these methylation differences are strongly correlated with expression. Together, our results provide the novel insight that DNA methylation changes that occur as islets age indicate an overall epigenetic drift toward the exocrine pancreas epigenome. These concerted shifts in the islet methylome could contribute to the age-associated decline in endocrine pancreas function. Pancreatic islets were isolated from P21/P180 SL or C mice. To ensure purity of islets, 3 rounds of manual picking were performed in each samples. Whole pancreas samples, ~98% of which is exocrine pancreas, were used as exocrine pancreas. There are 5 mice per group.
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Project description:deBack2012 - Lineage Specification in Pancreas Development
This model of two neighbouring pancreas precursor cells, describes the exocrine versus endocrine lineage specification process. To account for the tissue scale patterns, this couplet model has been extended to hundreds of coupled cells.
This model is described in the article:
On the role of lateral stabilization during early patterning in the pancreas
de Back W., Zhou JX, Brusch L
J. R. Soc. Interface 6 February 2013 vol. 10 no. 79 20120766
Abstract:
The cell fate decision of multi-potent pancreatic progenitor cells between the exocrine and endocrine lineages is regulated by Notch signalling, mediated by cell–cell interactions. However, canonical models of Notch-mediated lateral inhibition cannot explain the scattered spatial distribution of endocrine cells and the cell-type ratio in the developing pancreas. Based on evidence from acinar-to-islet cell transdifferentiation in vitro, we propose that lateral stabilization, i.e. positive feedback between adjacent progenitor cells, acts in parallel with lateral inhibition to regulate pattern formation in the pancreas. A simple mathematical model of transcriptional regulation and cell–cell interaction reveals the existence of multi-stability of spatial patterns whose simultaneous occurrence causes scattering of endocrine cells in the presence of noise. The scattering pattern allows for control of the endocrine-to-exocrine cell-type ratio by modulation of lateral stabilization strength. These theoretical results suggest a previously unrecognized role for lateral stabilization in lineage specification, spatial patterning and cell-type ratio control in organ development.
This model is hosted on BioModels Database
and identified by: MODEL1211010000
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for more information.
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Project description:The pancreas is a complex organ consisting of differentiated cells and extracellular matrix (ECM), which together enable its functions, including exocrine secretion and hormone production. Alt-hough much is known about the intrinsic factors that control pancreas development, under-standing of the microenvironment surrounding pancreatic cells remains incomplete. This envi-ronment is composed of various cells and ECM components, which play a critical role in main-taining tissue organization and homeostasis. In this study, we applied mass spectrometry to identify and quantify the ECM composition of the developing pancreas at embryonic E14.5 and perinatal P1 stages. Our proteomic analysis identified 160 ECM proteins that displayed a dynamic expression profile with a shift in collagens and proteoglycans. Furthermore, we used atomic force microscopy to measure the biomechanical properties of the ECM and found that the whole pan-creas ECM is relatively soft with no significant change during pancreas maturation. Finally, we developed a decellularization protocol for P1 pancreatic tissues, which preserved the 3D organi-zation of the ECM and can be used for recellularization studies. Our findings provide insights into the composition and biomechanics of the pancreatic embryonic and perinatal ECM, offering a foundation for future studies investigating the dynamic interactions between the ECM and pan-creatic cells.
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