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• W2792113936 abstract "Melanic pigments play a key role in the coloration of animals, but the type of melanin pigment in black, brown, and blue colored scales of Squamata has not been studied. Based on research on birds and mammals, we may expect that pheomelanin is the majority pigment in brownish colorations and eumelanin is the majority pigment in black and blue colorations of Squamata. To characterize the pigments that underlie the melanin-based colorations of lizards, we analyzed the skin of nine genera of lacertids using dispersive Raman spectroscopy. Our results suggest that no prediction can be made on the type of pigmentary melanin present in the skin of the lacertids based alone on the hue of the sample. Indeed, brownish patterns in the skin of Psammodromus, Gallotia, Acanthodactylus, and Algyroides lizards presented both chemical forms of melanin: eumelanin and pheomelanin. Therefore, pheomelanogenesis might be an ancient characteristic within Lacertidae, because it was detected in genera in the Lacertini, Eremini, and Gallotini. Raman spectra of melanic-based patterns of genus Zootoca and ultraviolet (UV)-blue patches of Podarcis, Iberolacerta, Lacerta, and Timon lizards suggested that eumelanin is the majority pigment in these patches. Raman spectroscopy is a suitable nondestructive technique useful to identify melanin forms in the skin of lizards, and it demonstrated that pheomelanin is synthesized by Squamata.Los pigmentos melánicos juegan un papel clave en la coloración de los animales. Sin embargo, en los Squamata se desconoce la identidad molecular de los pigmentos melánicos (i.e., eumelanina y feomelanina) responsables de las coloraciones negras, marrones y azules. Basado en estudios anteriores en aves y mamíferos, cabría esperar que la feomelanina fuera el pigmento mayoritario en coloraciones marrones y que la eumelanina sea el pigmento mayoritario en las coloraciones negras y azules de los Squamata. Para caracterizar los pigmentos responsables de la coloración melánica en lagartos hemos analizado la piel de nueve géneros de lacértidos usando espectroscopía Raman dispersiva. Nuestros resultados sugieren que no se puede predecir el tipo de melanina pigmentaria presente en la piel de los lácertidos basándonos solo en la tonalidad de la muestra. De hecho, en los patrones de color marrón de la piel de lagartos de los géneros Psammodromus, Gallotia, Acanthodactylus y Algyroides están presentes ambas formas químicas de la melanina pigmentaria, es decir, eumelanina y feomelanina. En los patrones melánicos del género Zootoca y en las manchas ultravioleta (UV)-azules de lagartos en los géneros Podarcis, Iberolacerta, Lacerta, y Timon el espectro Raman sugirió que la forma eumelánica debe de ser el pigmento mayoritario en estas manchas. La espectroscopía Raman es una técnica no destructiva que es aplicable para identificar las formas melánicas presentes en la piel de los lagartos y demostró que los Squamata pueden sintetizar feomelanina." @default.
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• W2792113936 date "2018-03-01" @default.
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• W2792113936 title "Raman Spectroscopy Reveals the Presence of Both Eumelanin and Pheomelanin in the Skin of Lacertids" @default.
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• W2792113936 doi "https://doi.org/10.1670/16-140" @default.
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