Ontology highlight
ABSTRACT:
PROVIDER: PRJNA904397 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR22385133_1.fastq.gz | Fastqsanger.gz | |||
| SRR22385133_2.fastq.gz | Fastqsanger.gz | |||
| SRR22385134_1.fastq.gz | Fastqsanger.gz | |||
| SRR22385134_2.fastq.gz | Fastqsanger.gz | |||
| SRR22385135_1.fastq.gz | Fastqsanger.gz |
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Project description:Study abstract: Axolotl salamanders (Ambystoma mexicanum) remain aquatic in their natural state, during which biomechanical forces on their diarthrodial limb joints are likely reduced relative to salamanders living on land. However, even as sexually mature adults, these amphibians can be induced to metamorphose into a weight-bearing terrestrial stage by environmental stress or the exogenous administration of thyroxine hormone. In some respects, this aquatic to terrestrial transition of axolotl salamanders through metamorphosis may model developmental and changing biomechanical skeletal forces in mammals during the prenatal to postnatal transition at birth and in the early postnatal period. To assess differences in the appendicular skeleton as a function of metamorphosis, anatomical and gene expression parameters were compared in skeletal tissues between aquatic and terrestrial axolotls that were the same age and genetically full siblings. The length of long bones and area of cuboidal bones in the appendicular skeleton, as well as the cellularity of cartilaginous and interzone tissues of femorotibial joints were generally higher in aquatic axolotls compared to their metamorphosed terrestrial siblings. A comparison of steady state mRNA transcripts encoding aggrecan core protein (ACAN), type II collagen (COL2A1), and growth and differentiation factor 5 (GDF5) in femorotibial cartilaginous and interzone tissues did not reveal any significant differences between aquatic and terrestrial axolotls. RNAseq samples: Total RNA was isolated from whole body tissue samples of Mexican axolotl salamanders (Ambystoma mexicanum) at the following developmental stages: Embryo at the tail bud stage, newly hatched larva, larva at the limb bud stage, juvenile at 8.5 centimeters, and adult using variations of guanidinium-based protocols. RNA quantity, purity, and integrity of both the individual samples and the resulting pool were determined with an Agilent 2100 Bioanalyzer using the Eukaryotic Total RNA nano series II analysis kit. The pooled RNA sample was poly-A selected and used for Illumina random priming directional library prep. Four lanes were sequenced only on one end providing single end reads and 4 lanes were sequenced at both ends giving paired-end reads. The library was sequenced on an Illumina HiSeq 2000 for 75bp reads producing 147,248,512 single end reads and 2 x 153,254,667 paired-end reads.
2018-07-29 | E-MTAB-6092 | biostudies-arrayexpress
Project description:While considerable progress has been made towards understanding the complex processes and pathways that regulate human wound healing, regenerative medicine has been unable to develop therapies that coax the natural wound environment to heal scar-free. The inability to induce perfect skin regeneration stems partly from our limited understanding of how scar-free healing occurs in a natural setting. Here we have investigated the wound repair process in adult axolotls and demonstrate that they are capable of perfectly repairing full thickness excisional wounds made on the flank. In the context of mammalian wound repair, our findings reveal a substantial reduction in hemostasis, reduced neutrophil infiltration and a relatively long delay in production of new extracellular matrix (ECM) during scar-free healing. Additionally, we test the hypothesis that metamorphosis leads to scarring and instead show that terrestrial axolotls also heal scar-free, albeit at a slower rate. Analysis of newly forming dermal ECM suggests that low levels of fibronectin and high levels of tenascin-C promote regeneration in lieu of scarring. Lastly, a genetic analysis during wound healing comparing epidermis between aquatic and terrestrial axolotls suggests that matrix metalloproteinases may regulate the fibrotic response. Our findings outline a blueprint to understand the cellular and molecular mechanisms coordinating scar-free healing that will be useful towards elucidating new regenerative therapies targeting fibrosis and wound repair. We used microarray analysis to determine the gene expression changes that take place during scar free wound healing in aquatic and terrestrial axolotl salamanders. Epidermal tissue was harvested using a 4mm biopsy punch. Two wounds were made along the flank and posterior to the forelimbs. Harvested epidermis was pooled for each animal. Four biological replicates were collected from uninjured epidermis (D0) and at 1, 3, and 7 days post injury.
2012-01-31 | E-GEOD-35255 | biostudies-arrayexpress
Project description:Essential to terrestrial life is the formation of a competent skin barrier that prevents desiccation and entry by harmful substances. A tightly orchestrated series of cellular changes is required for the proper formation of the epidermal permeability barrier. These changes occur in the context of the commensal skin microbiota. Using germ free mice and antibiotic depletion models, we demonstrate the microbiota is necessary for proper differentiation and repair of the barrier. These effects were mediated by keratinocyte signaling through the aryl hydrocarbon receptor (AHR), a xenobiotic receptor that also regulates epidermal differentiation. Murine skin lacking keratinocyte AHR was more susceptible to infection by S. aureus and increased pathology in a model of atopic dermatitis. Topical colonization with a defined consortium of human skin commensals restored barrier competence in germ free skin and during epicutaneous sensitization; these effects were dependent on keratinocyte AHR. We reveal a fundamental role for the commensal skin microbiota in directing skin barrier formation and repair through the AHR, with far-reaching implications for the numerous skin disorders characterized by disrupted epidermal differentiation and/or barrier competence.
2021-03-31 | GSE162925 | GEO
Project description:The order Caudata of amphibians has been important in the study of tissue regeneration. The most complete genetic available data from salamanders are from Ambystoma mexicanum (Ambystomidae) and Notophthalmus viridescens (Salamandridae). Transcriptome data obtained with Next-generation sequencing technology has become a useful tool to discover new candidate genes in non-model organisms without a genome of reference. This study highlights the need of performing RNA-sequencing in other salamander species to compare and identify important clusters of genes that could be modulating important biological process in amphibians. Here we describe a de novo reference transcriptome and its annotation of a non-model terrestrial salamander, Bolitoglossa vallecula (Caudata: Plethodontidae). For this purpose, we utilized genome protein databases from vertebrates, nucleotide sequences obtained for salamander species, and a de novo reference transcriptomes of Bolitoglossa ramosi to conduct a homology analysis. While the majority of the transcripts recovered homologs with Bolitoglossa ramosi, only a minority of the data (22%; n= 94,739) recovered homologs with other vertebrates. We also compared the transcriptome profile of skin tissue between these Bolitoglossa species. We found a group of antimicrobial peptides, such as cathelicidins, which have been not previously described in salamanders and could be important modulators of different biological process. All animals used in this work were collected under the Contract on Genetic Access for scientific research for non commercial profit (Contrato de acceso a recursos genéticos para la investigación científica sin interés commercial) to Resources number 118–2015.
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Project description:We identified a number of affected pathways through transcriptome analysis on the skin biopsy samples of the FPPK patients. Our findings suggest that TRPV3 dysfunction may increase apoptotic activity, inhibit keratinocyte differentiation and disturb the intricate balance between proliferation and differentiation state of keratinocytes in the skin.
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2013-12-24 | GSE53614 | GEO
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2013-12-24 | GSE53613 | GEO