scholarly journals Spatiotemporal Expression Patterns of Critical Genes Involved in FGF Signaling during Morphogenesis and Odontogenesis of Deciduous Molar in Miniature Pig

2021 ◽  
Author(s):  
Wenwen Guo ◽  
Ran Zhang ◽  
Lei Hu ◽  
Jiangyi Wang ◽  
Fu Wang ◽  
...  
Keyword(s):  
Tooth Development ◽  
Expression Patterns ◽  
Large Animal ◽  
Miniature Pig ◽  
Fgf Signaling ◽  
Expression Levels ◽  
Large Animal Models ◽  
Spatiotemporal Expression ◽  
Dental Epithelium ◽  
Deciduous Molar

Abstract Background The fibroblast growth factor (FGF) pathway plays important role in epithelial-mesenchymal interactions during tooth development. However, how the ligands, receptors, and inhibitors of the FGF pathway get involved into the epithelial-mesenchymal interactions are largely unknown in miniature pigs, which can be used as large animal models for similar tooth anatomy and replacement patterns to humans. Results In this study, we investigated the spatiotemporal expression patterns of critical genes encoding FGF ligands, receptors, and inhibitors in the third deciduous molar of the miniature pig at the cap, early bell, and late bell stages. With the methods of fluorescence in situ hybridization and real time RT-PCR, it was revealed that the expression of Fgf3, Fgf4, Fgf7, and Fgf9 mRNAs were located mainly in the dental epithelium and underlying mesenchyme at the cap stage. The expression levels of Fgf3 and Fgf7 in the mesenchyme were upregulated in the early bell stage and then concentrated in the odontoblasts layer in the late bell stage. In contrast, the expression levels of Fgf4 and Fgf9 in the mesenchyme were downregulated from the cap to bell stage. Gene expression analysis also suggested that Fgfr1 and Fgfr3 were the major receptors regulating dental calcification. Furthermore, the inhibitor-coding genes Sprouty 2 and Sprouty 4 were expressed in the epithelium and mesenchyme in the three stages, indicating that elaborate regulation occurred during dental morphogenesis. Conclusions The spatiotemporal expression pattern of FGF signaling provides the foundation for future studies aiming to fine-tune dental morphogenesis and odontogenesis by controlling the interactions between the dental epithelium and mesenchyme, thereby promoting tooth regeneration in large mammals.

Expression patterns and immunohistochemical analysis of ERK, HRAS and MEK1 proteins during ovarian prehierarchical follicular development in Zi geese (Anser cygnoides)

2019 ◽  
Author(s):  
H. Lu ◽  
C. T. Sello ◽  
C. Liu ◽  
Y. Sui ◽  
C. Xu ◽  
...  
Keyword(s):  
Protein Localization ◽  
Quantitative Polymerase Chain Reaction ◽  
Expression Patterns ◽  
Follicular Development ◽  
Immunohistochemical Analysis ◽  
Mitogen Activated Protein Kinase ◽  
Expression Levels ◽  
Protein Levels ◽  
Spatiotemporal Expression ◽  
Mitogen Activated Protein

The objective of this study was to investigate the spatiotemporal expression levels and protein localization of extracellular regulated MAP kinase (ERK), HRas proto-oncogene, GTPase (HRAS), and mitogen-activated protein kinase kinase 1 (MEK1) genes in ovarian prehierarchical follicles of geese. The prehierarchical follicles from healthy laying geese (n=6) at the age of 35 to 37 weeks were harvested. The relative expression levels of ERK, HRAS, and MEK1 in various sized prehierarchical follicles were detected by real-time quantitative polymerase chain reaction (RT-qPCR), western blotting, and follicular wall localization was investigated by using immunohistochemistry. The results revealed that the candidate genes were expressed differently at mRNA and protein levels at five stages of prehierarchical follicle development. These results suggest that ERK, HRAS, and MEK1 might be associated to the key biological mechanisms regulating Zi geese folliculogenesis.

scholarly journals Porcine Models of Accelerated Coronary Atherosclerosis: Role of Diabetes Mellitus and Hypercholesterolemia

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Damir Hamamdzic ◽  
Robert L. Wilensky
Keyword(s):  
Animal Models ◽  
Coronary Atherosclerosis ◽  
Pig Model ◽  
Large Animal ◽  
Rodent Models ◽  
Miniature Pig ◽  
Therapeutic Approaches ◽  
Large Animal Models ◽  
Atherosclerotic Lesions

Animal models of atherosclerosis have proven to be an invaluable asset in understanding the pathogenesis of the disease. However, large animal models may be needed in order to assess novel therapeutic approaches to the treatment of atherosclerosis. Porcine models of coronary and peripheral atherosclerosis offer several advantages over rodent models, including similar anatomical size to humans, as well as genetic expression and development of high-risk atherosclerotic lesions which are similar to humans. Here we review the four models of porcine atherosclerosis, including the diabetic/hypercholesterolemic model, Rapacz-familial hypercholesterolemia pig, the (PCSK9) gain-of-function mutant pig model, and the Ossabaw miniature pig model of metabolic syndrome. All four models reliably represent features of human vascular disease.

Mouse Serrate-1 (Jagged-1): expression in the developing tooth is regulated by epithelial-mesenchymal interactions and fibroblast growth factor-4

Development ◽  
1997 ◽  
Vol 124 (8) ◽  
pp. 1473-1483 ◽  
Author(s):  
T.A. Mitsiadis ◽  
D. Henrique ◽  
I. Thesleff ◽  
U. Lendahl
Keyword(s):  
Growth Factor ◽  
Fibroblast Growth Factor ◽  
Cell Fate ◽  
Tooth Development ◽  
Expression Patterns ◽  
Control Cell ◽  
Fibroblast Growth ◽  
Down Regulation ◽  
Cell Fate Decisions ◽  
Dental Epithelium

Serrate-like genes encode transmembrane ligands to Notch receptors and control cell fate decisions during development. In this report, we analyse the regulation of the mouse Serrate-1 gene during embryogenesis. The Serrate-1 gene is expressed from embryonic day 7.5 (E7.5) and expression is often observed at sites of epithelial-mesenchymal interactions, including the developing tooth, where Serrate-1 is first (E11.5) expressed in all cells of the dental epithelium, but not in mesenchyme. A transient upregulation in dental mesenchyme (E12.5-15.5) is correlated with down-regulation of Serrate-1 expression in epithelial cells contacting the mesenchyme, i.e. in the cells destined to become ameloblasts. This expression pattern is reproduced in explants of dental epithelium and mesenchyme in vitro: epithelium induces Serrate-1 expression in mesenchyme, while epithelium in close proximity to this mesenchyme does not express detectable levels of Serrate-1 mRNA, suggesting that down-regulation of Serrate-1 expression in preameloblasts is caused by mesenchyme-derived signals. Finally, regulation of Serrate-1 expression differs from that of Notch genes. The Serrate-1 gene is induced in dental mesenchyme by fibroblast growth factor-4, but not by bone morphogenetic proteins, while the converse is true for Notch genes. This indicates that, at least during tooth development, the expression patterns observed for receptors and ligands in the Notch signaling pathway are generated by different induction mechanisms.

scholarly journals Dosage of duplicated and antifunctionalized homeobox proteins influences spikelet development in barley

2021 ◽  
Author(s):  
Venkatasubbu Thirulogachandar ◽  
Geetha Govind ◽  
Goetz Hensel ◽  
Sandip Kale ◽  
Markus Kuhlmann ◽  
...  
Keyword(s):  
Nucleotide Diversity ◽  
Leucine Zipper ◽  
Expression Patterns ◽  
Hordeum Vulgare L ◽  
Expression Levels ◽  
Endogenous Expression ◽  
Spatiotemporal Expression ◽  
Lateral Spikelet ◽  
Hordeum Species ◽  
Barley Genotypes

Illuminating the mechanisms of inflorescence architecture of grain crops that feed our world may strengthen the goal towards sustainable agriculture. Lateral spikelet development of barley (Hordeum vulgare L.) is such an example of a floral architectural trait regulated by VRS1 (Vulgare Row-type Spike 1 or Six-rowed Spike 1, syn. HvHOX1). The mechanistic function of this gene and its paralog HvHOX2 on spikelet development is still fragmentary. Here, we show that these duplicated transcription factors (TFs) have contrasting nucleotide diversity in various barley genotypes and several Hordeum species. Despite this difference, both proteins retain their basic properties of the homeodomain leucine zipper class I family of TFs. During spikelet development, these genes exhibit similar spatiotemporal expression patterns yet with anticyclic expression levels. A gene co-expression network analysis suggested that both have an ancestral relationship but their functions appear antagonistic to each other, i.e., HvHOX1 suppresses whereas HvHOX2 rather promotes spikelet development. Our transgenic promoter-swap analysis showed that HvHOX2 can restore suppressed lateral spikelets when expression levels are increased; however, at its low endogenous expression level, HvHOX2 appears dispensable for spikelet development. Collectively, this study proposes that the dosage of the two antagonistic TFs, HvHOX1 and HvHOX2, influence spikelet development in barley.

scholarly journals System-level analyses of keystone genes required for mammalian tooth development

2019 ◽  
Author(s):  
Outi Hallikas ◽  
Rishi Das Roy ◽  
Mona M. Christensen ◽  
Elodie Renvoisé ◽  
Ana-Marija Sulic ◽  
...  
Keyword(s):  
Gene Expression ◽  
Single Cell ◽  
Tooth Development ◽  
Expression Patterns ◽  
Transcriptome Profiling ◽  
System Level ◽  
Expression Domain ◽  
Expression Levels ◽  
Main Driver ◽  
Elevated Expression

AbstractWhen a null mutation of a gene causes a complete developmental arrest, the gene is typically considered essential for life. Yet, in most cases null mutations have more subtle effects on the phenotype. Here we used the phenotypic severity of mutations as a tool to examine system-level dynamics of gene expression. We classify genes required for the normal development of the mouse molar into different categories that range from essential to subtle modification of the phenotype. Collectively, we call these the developmental keystone genes. Transcriptome profiling using microarray and RNAseq analyses of patterning stage mouse molars show highly elevated expression levels for genes essential for the progression of tooth development, a result reminiscent of essential genes in single cell organisms. Elevated expression levels of progression genes were also detected in developing rat molars, suggesting evolutionary conservation of this system-level dynamics. Single-cell RNAseq analyses of developing mouse molars reveal that even though the size of the expression domain, measured in number of cells, is the main driver of organ-level expression, progression genes show high cell-level transcript abundances. Progression genes are also upregulated within their pathways, which themselves are highly expressed. In contrast, a high proportion of the genes required for normal tooth patterning are secreted ligands that are expressed in fewer cells than their receptors and intracellular components. Overall, even though expression patterns of individual genes can be highly different, conserved system-level principles of gene expression can be detected using phenotypically defined gene categories.

scholarly journals Genome-wide identification and expression analysis of Raffinose synthetase family in cotton

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Ruifeng Cui ◽  
Xiaoge Wang ◽  
Waqar Afzal Malik ◽  
Xuke Lu ◽  
Xiugui Chen ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Expression Patterns ◽  
Regulatory Elements ◽  
Plant Leaves ◽  
Motif Analysis ◽  
Expression Levels ◽  
Genome Wide ◽  
Salt And Drought Stress ◽  
Key Genes ◽  
Stress Gene

Abstract Background The Raffinose synthetase (RAFS) genes superfamily is critical for the synthesis of raffinose, which accumulates in plant leaves under abiotic stress. However, it remains unclear whether RAFS contributes to resistance to abiotic stress in plants, specifically in the Gossypium species. Results In this study, we identified 74 RAFS genes from G. hirsutum, G. barbadense, G. arboreum and G. raimondii by using a series of bioinformatic methods. Phylogenetic analysis showed that the RAFS gene family in the four Gossypium species could be divided into four major clades; the relatively uniform distribution of the gene number in each species ranged from 12 to 25 based on species ploidy, most likely resulting from an ancient whole-genome polyploidization. Gene motif analysis showed that the RAFS gene structure was relatively conservative. Promoter analysis for cis-regulatory elements showed that some RAFS genes might be regulated by gibberellins and abscisic acid, which might influence their expression levels. Moreover, we further examined the functions of RAFS under cold, heat, salt and drought stress conditions, based on the expression profile and co-expression network of RAFS genes in Gossypium species. Transcriptome analysis suggested that RAFS genes in clade III are highly expressed in organs such as seed, root, cotyledon, ovule and fiber, and under abiotic stress in particular, indicating the involvement of genes belonging to clade III in resistance to abiotic stress. Gene co-expressed network analysis showed that GhRFS2A-GhRFS6A, GhRFS6D, GhRFS7D and GhRFS8A-GhRFS11A were key genes, with high expression levels under salt, drought, cold and heat stress. Conclusion The findings may provide insights into the evolutionary relationships and expression patterns of RAFS genes in Gossypium species and a theoretical basis for the identification of stress resistance materials in cotton.

scholarly journals Molecular Mechanisms of Fetal Tendon Regeneration Versus Adult Fibrous Repair

2021 ◽  
Vol 22 (11) ◽  
pp. 5619
Author(s):  
Iris Ribitsch ◽  
Andrea Bileck ◽  
Alexander D. Aldoshin ◽  
Maciej M. Kańduła ◽  
Rupert L. Mayer ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Molecular Mechanisms ◽  
Unmet Need ◽  
Tendon Healing ◽  
Tendon Injury ◽  
Inflammatory Factors ◽  
Large Animal ◽  
Post Injury ◽  
Tendon Regeneration ◽  
Large Animal Models

Tendinopathies are painful, disabling conditions that afflict 25% of the adult human population. Filling an unmet need for realistic large-animal models, we here present an ovine model of tendon injury for the comparative study of adult scarring repair and fetal regeneration. Complete regeneration of the fetal tendon within 28 days is demonstrated, while adult tendon defects remained macroscopically and histologically evident five months post-injury. In addition to a comprehensive histological assessment, proteome analyses of secretomes were performed. Confirming histological data, a specific and pronounced inflammation accompanied by activation of neutrophils in adult tendon defects was observed, corroborated by the significant up-regulation of pro-inflammatory factors, neutrophil attracting chemokines, the release of potentially tissue-damaging antimicrobial and extracellular matrix-degrading enzymes, and a response to oxidative stress. In contrast, secreted proteins of injured fetal tendons included proteins initiating the resolution of inflammation or promoting functional extracellular matrix production. These results demonstrate the power and relevance of our novel ovine fetal tendon regeneration model, which thus promises to accelerate research in the field. First insights from the model already support our molecular understanding of successful fetal tendon healing processes and may guide improved therapeutic strategies.

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