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Gene expression and alllele inheritence in xiphophorus spontaneous melanoma in backcross BC1 interspecies animals in Xiphophorus maculatus Skin

ABSTRACT: RNA-Seq of spontaneous melanoma in Xiphophorus interspecies hybrids, and paired normal skin samples from the same melanoma-bearing animals were performed.

OTHER RELATED OMICS DATASETS IN: PRJNA453411

ORGANISM(S): Xiphophorus maculatus x Xiphophorus hellerii

PROVIDER: GSE113622 | GEO | 2018/05/01

REPOSITORIES: GEO

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Gene expression and alllele inheritence in xiphophorus spontaneous melanoma in backcross BC1 interspecies animals in Xiphophorus maculatus Skin

Project description:Gene expression and alllele inheritence in xiphophorus spontaneous melanoma in backcross BC1 interspecies animals in Xiphophorus maculatus Skin

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Project description:Changes in the transcriptional profiles of Xiphophorus maculatus skin was assessed by RNA-Seq after exposure to fluorescent (i.e., FL, 4,100K or “cool white”), or narrow wavelength regions of light between 300-600 nm (i.e., 50 nm or 10 nm regions, herein termed ”wavebands”). Exposure to varied 50 nm wavebands allowed identification of waveband specific transcriptional modulation within gene sets representing discrete functional pathways within Xiphophorus skin. For example, exposure to either 350-400 or 450-500 nm wavebands resulted in opposite transcriptional effects in necrosis and apoptosis gene sets that predict selective differential suppression or activation of these pathways (i.e., 350-400 nm; necrosis suppression, apoptosis activation, and 450-500 nm; apoptosis suppression, necrosis activation). Further investigation of waveband specific transcription employing successive 10 nm waveband exposures within the genetically responsive 500-550 nm waveband show; (a) greater numbers of genes may be transcriptionally modulated after 10 nm exposures, than observed for either 50 nm or FL exposures. (b) the 10 nm wavebands incite greater functional specificity than either 50 nm or FL exposures. (c) The principal genetic effects of FL are primarily due to the 30 nm between 500 to 530 nm.

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Molecular genetic response of Xiphophorus maculatus-X. couchianus interspecies hybrid skin to UVB exposure.

Project description:The phenotypic and genetic similarities between Xiphophorus and human melanoma render Xiphophorus a useful animal model for studying the genetic basis of melanoma etiology. In the Xiphophorus model, melanoma has been shown to be inducible by ultraviolet light (UVB) exposure among interspecies hybrids, but not in parental line fish similarly treated. This leads to questions of what genes are responsive to UVB exposure in the skin of the interspecies hybrids, as well as how parental alleles in hybrids may be differentially regulated and the potential roles they may play in induced melanomagenesis. To address these questions, we produced X. maculatus Jp 163 B×X. couchianus (Sp-Couch) F1 hybrid fish, exposed both hybrid and parental fish to UVB, and performed gene expression profiling of the skin using RNA-Seq methodology. We characterized a group of unique UVB-responsive genes in Sp-Couch hybrid including dct, pmela, tyr, tyrp1a, slc2a11b, rab38a, rab27, tspan10, slc45a2, oca2, slc24a5, ptn and mitfa. These genes are associated with melanin production and melanocyte proliferation. They were also up-regulated in Sp-Couch hybrid, indicating that their UVB response is hybridization initiated. In the hybrid, several melanin production and pigmentation related genes, including slc45a2, tspan10, dct, slc2a11b and ptn showed either X. couchianus or X. maculatus allele specific expression. The finding that these genes exhibit allele specific expression regulatory mechanisms in Sp-Couch hybrids, but do not exhibit a corresponding UVB response in either one of the parental fishes, may suggest UVB targets and imply mechanisms regarding the susceptibility of Sp-Couch to induced melanomagenesis.

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Project description:Gene expression profiles of Xiphophorus skin over a 24 hour period were established to identify cyclic transcriptional patterns

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