Xiphophorus fishes have been used as a vertebrate experimental model for fundamental biomedical research for over 60 years. This R24 proposal outlines both resource and research components designed to maintain and enhance the Xiphophorus Genetic Stock Center (XGSC) that has operated within the United States since the 1930's making it one of the oldest live animal resources centers worldwide and a national scientific treasure. The XGSC houses over 60 pedigreed genetic lines representing 25 Xiphophorus species in over 1,400 aquaria. The XGSC has provided pedigreed fish and materials to researchers in over 30 laboratories representing 11 countries. The traditional strength of the Xiphophorus experimental model involves the non-biased assessment of genetic inheritance patterns associated with complex phenotypes within intact animals. For example, genetic control of tumor susceptibility has been documented in both pure Xiphophorus strains and select interspecies hybrids, for a variety of spontaneous and induced neoplasms including several genetically distinct melanomas. Our preliminary studies represent a first global comparison of the relative abundance of species-specific allele expression in two vertebrate species and Fl hybrids. In this initial study we were able to identify substantial changes in gene expression levels for parental alleles in the interspecies hybrid genetic background. We also found a new class of genetic interactions that lead to substantially suppressed gene expression in Fl hybrids relative to either parent. These initial experiments, employing RNAseq to follow allele specific gene expression in Fl interspecies hybrids, serve as examples of the Xiphophorus model may be used to uncover new knowledge regarding the mechanics of gene interactions, the genetic basis of developmental programs, complex behaviors, and the molecular processes underlying disease initiation and progression. If the goals of this proposal are realized, mechanistic dissection of Xiphophorus interspecies hybrid melanoma models may be approached and the results gleaned will have translational significance to tumorigenesis in humans.
If the goals of this proposal are realized, mechanistic dissection of Xiphophorus interspecies hybrid melanoma models may be approached since genome and transcriptome sequences of both parental species will allow assessment of genetic regulatory changes that produce an individual that is predisposed to melanoma. These results will have direct translational significance to tumorigenesis in humans.
|Tiersch, Terrence R; Monroe, William T (2016) Three-dimensional printing with polylactic acid (PLA) thermoplastic offers new opportunities for cryobiology. Cryobiology 73:396-398|
|Schartl, Manfred; Walter, Ronald B (2016) Xiphophorus and Medaka Cancer Models. Adv Exp Med Biol 916:531-52|
|Shen, Yingjia; Chalopin, Domitille; Garcia, Tzintzuni et al. (2016) X. couchianus and X. hellerii genome models provide genomic variation insight among Xiphophorus species. BMC Genomics 17:37|
|Torres, Leticia; Tiersch, Terrence R (2016) Amine reactive dyes: an alternative to estimate membrane integrity in fish sperm cells. Aquaculture 463:71-78|
|Walter, Ronald B; Obara, Tomoko (2015) Workshop report: The medaka model for comparative assessment of human disease mechanisms. Comp Biochem Physiol C Toxicol Pharmacol 178:156-62|
|Boswell, William; Boswell, Mikki; Titus, James et al. (2015) Sex-specific molecular genetic response to UVB exposure in Xiphophorus maculatus skin. Comp Biochem Physiol C Toxicol Pharmacol 178:76-85|
|Walter, Ronald B; Walter, Dylan J; Boswell, William T et al. (2015) Exposure to fluorescent light triggers down regulation of genes involved with mitotic progression in Xiphophorus skin. Comp Biochem Physiol C Toxicol Pharmacol 178:93-103|
|Lu, Yuan; Bowswell, Mikki; Bowswell, William et al. (2015) Molecular genetic response of Xiphophorus maculatus-X. couchianus interspecies hybrid skin to UVB exposure. Comp Biochem Physiol C Toxicol Pharmacol 178:86-92|
|Chang, Jordan; Lu, Yuan; Boswell, William T et al. (2015) Molecular genetic response to varied wavelengths of light in Xiphophorus maculatus skin. Comp Biochem Physiol C Toxicol Pharmacol 178:104-15|
|Amores, Angel; Catchen, Julian; Nanda, Indrajit et al. (2014) A RAD-tag genetic map for the platyfish (Xiphophorus maculatus) reveals mechanisms of karyotype evolution among teleost fish. Genetics 197:625-41|
Showing the most recent 10 out of 28 publications