MC1R diversity in West Maharashtra
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ABSTRACT:
PROVIDER: PRJEB44973 | ENA |
REPOSITORIES: ENA
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Project description:Germline mutations in CDKN2A and/or red hair colour variants in MC1R genes are associated with an increased susceptibility to develop cutaneous melanoma. To investigate the impact of germinal p.G101W CDKN2A mutation and MC1R variants on gene expression and transcription profiles associated to skin cancer and melanoma in particular, we set-up primary skin cultures from twins belonging to the melanoma prone-families with and without these genomic features. were analyzed using expression array methodology. Overall, 1535 transcripts were deregulated in CDKN2A mutated cells, finding overexpression of immunity-related genes (HLA-DPB1, CLEC2B, IFI44, IFI44L, IFI27, IFIT1, IFIT2, SP110 and IFNK) and downregulation of genes playing a role in the Notch signaling pathway. 3570 transcripts were deregulated in carriers of MC1R variants. In this case, upregulated genes were involved in oxidative stress and DNA damage pathways as well as in neurodegenerative diseases such as Parkinson’s, Alzheimer and Huntington. In contrast, downregulated genes were associated with pigmentation synthesis/transport and angiogenesis. By using a coculture system, this study identified key molecular functions and/or pathways that are deregulated due to alterations in melanoma susceptibility genes which in turn, could be involved in initiation/progression of the disease. 12 samples total. Several experimental groups: with and without genomic features (CDKN2A, MC1R).
2013-12-31 | E-GEOD-44805 | biostudies-arrayexpress
Project description:Germline mutations in CDKN2A and/or red hair colour variants in MC1R genes are associated with an increased susceptibility to develop cutaneous melanoma. To investigate the impact of germinal p.G101W CDKN2A mutation and MC1R variants on gene expression and transcription profiles associated to skin cancer and melanoma in particular, we set-up primary skin cultures from twins belonging to the melanoma prone-families with and without these genomic features. were analyzed using expression array methodology. Overall, 1535 transcripts were deregulated in CDKN2A mutated cells, finding overexpression of immunity-related genes (HLA-DPB1, CLEC2B, IFI44, IFI44L, IFI27, IFIT1, IFIT2, SP110 and IFNK) and downregulation of genes playing a role in the Notch signaling pathway. 3570 transcripts were deregulated in carriers of MC1R variants. In this case, upregulated genes were involved in oxidative stress and DNA damage pathways as well as in neurodegenerative diseases such as Parkinson’s, Alzheimer and Huntington. In contrast, downregulated genes were associated with pigmentation synthesis/transport and angiogenesis. By using a coculture system, this study identified key molecular functions and/or pathways that are deregulated due to alterations in melanoma susceptibility genes which in turn, could be involved in initiation/progression of the disease.
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Project description:Amplification of the Melanocortin-1 Receptor in Nephrotic Syndrome Renders a Good Target for Podocyte Cytoskeleton Stabilization During the last years, several reports have been presented of beneficial effects of ACTH in patients with nephrotic syndrome. Among the known ACTH receptors, the melanocortin-1 receptor (MC1R) has been suggested as the mediator of the ACTH renoprotective effect with the mechanism of action resulting in stabilization of the actin cytoskeleton in podocytes. To understand how melanocortin receptors are regulated in nephrotic syndrome and how they are involved in restoration of filtration barrier function, melanocortin receptor expression was evaluated in patients and in a rat model of nephrotic syndrome in combination with cell culture analysis. Phosphoproteomic mass spectrometry was applied and identified MC1R pathways confirmed using biochemical analysis. We found that glomerular MC1R expression was increased in nephrotic syndrome, both in humans and in a rat model. A MC1R agonist protected podocytes from protamine sulfate induced stress fiber loss with the top ranked phoshoproteomic MC1R activated pathway beeing actin cytoskeleton signaling. Actin stabilization through the MC1R consisted of ERK1/2 dependent phosphorylation and inactivation of EGFR signaling with stabilization of synaptopodin and stress fibers in podocytes. These results further explain how patients with nephrotic syndrome show responsiveness to ACTH treatment by depressing EGFR signaling through activation of the MC1R receptor and as a consequence restore filtration barrier function by stabilizing the podocyte actin cytoskeleton.
2019-11-12 | PXD009198 | Pride
Project description:Total RNA was extracted from the basal epidermis derived from UVB-irradiated P2.5 normal (Mc1r+/Mc1r+; Kit+/Kit+), Mc1r-mutant (Mc1re/Mc1re) and Kit-mutant (Kit/W-v/Kit/W-v) mice. Biological replicates (cy5) were labelled and co-hybridized with a reference RNA sample (cy3) to a 35K mouse cDNA microarray. A reference experiement design type is where all samples are compared to a common reference. Keywords: reference_design
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2018-07-16 | PXD008607 | Pride
Project description:O. rhodostigmatus are non-obligative cave dwellers, whose tadpoles keep albinistic phenotype in caves but rapidly darken in light within 24 hours. Their coloration system is an excellent model for exploring the processes and mechanisms of light-induced pigmentation and revealing the genetic adaptation for non-obligative cave dwelling due to complicated life history. Using comparative transcriptomics, we found that melanocyte MCC (including melanogenesis and melanocytes proliferation) was responsible for the rapid skin darkening in was activated in O. rhodostigmatus. Light exposure induced robust activation of growth signals (including growth factor signals, MAPK signal pathways and PIK3-Akt signal pathways) at transcriptional levels, which were likely the upstream activation signals of melanocyte MCC in O. rhodostigmatus tadpoles. These results evidenced that amphibians and mammals likely share similar regulatory signals for light-induced melanocyte MCC. The conservation of pigmentation mechanisms across lower vertebrates and mammals imply that knowledge based on simpler models could also provide implications for causations and therapies of human pigmentation disorders and pigmented tumors. In aspect of genetic adaptation, an in-frame deletion of four amino acids in the membrane/extracellular junctions of the second and third transmembrane domains of O. rhodostigmatus MC1R, the receptor for melanogenesis signal, was identified. This mutation increases the negative charge of the ligand pocket of MC1R and results stereo-tandem of three aspartate residues aligning towards its ligand pocket. The ligand pocket of O. rhodostigmatus MC1R resembles a trap for positively charged ligands (α-MSH and ACTH) and likely increases the ligands-dependent activity of MC1R, providing an explanation for the rapid MCC of O. rhodostigmatus in light. Meanwhile, increased negative charge of ligand pocket likely decreased the constitutive activity of MC1R, in in supporting the albinistic phenotype of cave dwelling tadpoles. Therefore, genetic change of MC1R explains, at least to some extent, how the pigmentation system of O. rhodostigmatus coordinates the capacity of rapid melanogenesis (or other types of pigment production) and pigment regression, a couple of seemingly contradictory coloration requirements. To our knowledge, this is the first study reporting the association between pigmentation phenotype adaptation and MC1R mutations in amphibians or in non-obligative cave dwellers.
2018-06-07 | GSE106622 | GEO
Project description:Total RNA was extracted from the basal epidermis derived from UVB-irradiated P2.5 normal (Mc1r+/Mc1r+; Kit+/Kit+), Mc1r-mutant (Mc1re/Mc1re) and Kit-mutant (Kit/W-v/Kit/W-v) mice. Biological replicates (cy5) were labelled and co-hybridized with a reference RNA sample (cy3) to a 35K mouse cDNA microarray.
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Project description:We used single-cell RNA-sequencing (scRNA-seq) of melanocytes isolated from two distict red hair color (RHC) mouse models for comparison with and black hair color, functional MC1R signaling, to reveal a Pheomelanin Gene Signature (PGS) of differentially expressed genes in RHC melanocytes.
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