Characterization of XM, a NovelXiphophorusMelanoma-Derived Cell Line
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Xiphophorus species, inbred strains, and interspecies hybrids have been used extensively to understand the genesis of melanoma and other types of malignancies. Despite sophisticated studies on the genetics of this model, biological studies have been limited by the availability of characterized cell lines. The authors have established a melanoma-derived cell line, XM, from the most commonly used interspecies hybrid model for studies of the genetics and cell biology of melanoma in Xiphophorus. This line demonstrated a previously unrecognized response to platelet-derived growth factor and exhibited a karyotype that was minimally aneuploid or possibly diploid. XM cells formed pigmented tumor-like masses when injected into zebrafish embryos. Some cells also migrated and exhibited differentiated pigment expression in a manner consistent with normal melanocytes. The XM cell is the first characterized line of known genetic background available for study of the in vitro biology of the Xiphophorus model.Keywords:
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A sex-linked gene controlling the age at which the gonadotrops of the pituitary gland differentiate has been discovered in Xiphophorus maculatus. Males homozygous for early differentiation become sexually mature between 10 and 16 weeks; those homozygous for late maturation between 22 and 40 weeks. Heterozygotes are intermediate. Since growth rate decreases when testes mature. the two classes of males differ significantly in adult size.
Xiphophorus
Poeciliidae
Sexual Differentiation
Heterozygote advantage
Cyprinodontiformes
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Xlphophorus helleri, commonly known as the swordtail, and Xlphophorus maculatus, commonly called the platyfish, are different species of the family Poecllildae. . A cross between the platyfish bearing the gene for a dorsal fin spot, and the swordtail yields melanomatous offspring. Since these tumors are colored a dark brown to black and can be readily detected, and since these tumors always appear in the hybrid bearing this gene, they are excellent tools for research aimed at the physiological, histological, and cytological manifestations of cancerous growth. It has been shown then, that the two species do produce some fertile offspring; however, the number of hybrids which are produced is low, as well as the number of offspring of the hybrids. This failure of the melanomatous fish to reproduce does, of course, limit the number available for research and Is detrimental to adequate testing, justifying the need to investigate this problem.
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Maturation in Xiphophorus maculatus (Pisces; Poeciliidae) is under control of the sex-linked P gene. However, when two individuals are reared together the socially dominant individual delays the maturation of the subordinate. Nevertheless, it is not a requirement that a fish be socially dominant to become mature. The data suggest that inhibition of maturity takes place when an individual is not dominant at a time near the genetically determined age of maturation. Two hypotheses are offered to explain these results.
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Poeciliidae
Cyprinodontiformes
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This datasheet on Xiphophorus maculatus covers Identity, Overview, Distribution, Dispersal, Diagnosis, Biology & Ecology, Environmental Requirements, Impacts, Uses, Prevention/Control, Further Information.
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Abstract Fish of the genus Xiphophorus are polymorphic for black pigmentation patterns. Certain intra- or interspecific hybrids exhibit enhanced expression of these patterns, leading in many cases to malignant melanoma. Because no recombination was ever observed between the pattern information and the genetic predisposition to develop melanoma after hybridization, a “tumor gene” (Tu) was postulated that encodes both phenotypes. A dominant oncogene, ONC-Xmrk, was then found to be necessary and sufficient for the transforming function of Tu. Here we present molecular evidence that ONC-Xmrk and the pigment pattern information are encoded by separate, although intimately linked loci. No ONC-Xmrk gene was present in the 15 Xiphophorus strains investigated which exhibit no black pigmentation pattern. Five different patterns from Xiphophorus maculatus, X. evelynae, X. milleri, X. cortezi, and X. montezumae were associated with ONC-Xmrk and were melanomagenic, while fish of X. helleri, X. variatus, X. nezahualcoyotl, and X. montezumae with five other patterns had no ONC-Xmrk and consequently did not produce hybrid melanoma. These data provide evidence that ONC-Xmrk is sufficient for tumorigenesis in Xiphophorus hybrids, and that a separate, pigment pattern-encoding locus is closely linked to it.
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Cyprinodontiformes
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A new experimental system for investigating platyfish-swordtail hybrid melanomas was developed using ornamental platyfish (Xiphophorus maculatus) and swordtails (Xiphophorus helleri). The incidence of melanomas in the hybrids was studied in relation to individual age factors. Based on the age of the onset of the melanomas, two types of the melanomas were discerned and were designated as the fry and the adult melanomas, respectively. The fry melanomas were characterized by early onset, wide-ranged lesions, an invasive nature owing to densely pigmented cells, and a tendency toward regression. The adult melanomas were characterized by occurrence in the later stage of life, a small number of primary sites, and rapid, expanding, and invasive growth due to sparsely pigmented cells.
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Cyprinodontiformes
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Rodlet cells occurred in the posterior intestine of embryos and neonates of the swordtail Xiphophorus nigrensis , its hybrids with Xiphophorus pygmaeus and in the platyfish Xiphophorus maculatus . This is the first observation of these enigmatic cells in a viviparous teleost prior to birth. This finding lends support to the endogenous tenet regarding the origin of this cell.
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