Genome mapping of a LYST mutation in corn snakes indicates that vertebrate chromatophore vesicles are lysosome-related organelles
Reptiles exhibit a spectacular diversity of skin colors and patterns brought about by the interactions among three chromatophore types: black melanophores with melanin-packed melanosomes, red and yellow xanthophores with pteridine- and/or carotenoid-containing vesicles, and iridophores filled with l...
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| Main Authors: | , , , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
October 5, 2020
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| In: |
Proceedings of the National Academy of Sciences of the United States of America
Year: 2020, Volume: 117, Issue: 42, Pages: 26307-26317 |
| ISSN: | 1091-6490 |
| DOI: | 10.1073/pnas.2003724117 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1073/pnas.2003724117 Verlag, lizenzpflichtig, Volltext: https://www.pnas.org/content/117/42/26307 
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| Author Notes: | Asier Ullate-Agote, Ingrid Burgelin, Adrien Debry, Carine Langrez, Florent Montange, Rodrigue Peraldi, Jean Daraspe, Henrik Kaessmann, Michel C. Milinkovitch, and Athanasia C. Tzika |
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| 245 | 1 | 0 | |a Genome mapping of a LYST mutation in corn snakes indicates that vertebrate chromatophore vesicles are lysosome-related organelles |c Asier Ullate-Agote, Ingrid Burgelin, Adrien Debry, Carine Langrez, Florent Montange, Rodrigue Peraldi, Jean Daraspe, Henrik Kaessmann, Michel C. Milinkovitch, and Athanasia C. Tzika |
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| 520 | |a Reptiles exhibit a spectacular diversity of skin colors and patterns brought about by the interactions among three chromatophore types: black melanophores with melanin-packed melanosomes, red and yellow xanthophores with pteridine- and/or carotenoid-containing vesicles, and iridophores filled with light-reflecting platelets generating structural colors. Whereas the melanosome, the only color-producing endosome in mammals and birds, has been documented as a lysosome-related organelle, the maturation paths of xanthosomes and iridosomes are unknown. Here, we first use 10x Genomics linked-reads and optical mapping to assemble and annotate a nearly chromosome-quality genome of the corn snake Pantherophis guttatus. The assembly is 1.71 Gb long, with an N50 of 16.8 Mb and L50 of 24. Second, we perform mapping-by-sequencing analyses and identify a 3.9-Mb genomic interval where the lavender variant resides. The lavender color morph in corn snakes is characterized by gray, rather than red, blotches on a pink, instead of orange, background. Third, our sequencing analyses reveal a single nucleotide polymorphism introducing a premature stop codon in the lysosomal trafficking regulator gene (LYST) that shortens the corresponding protein by 603 amino acids and removes evolutionary-conserved domains. Fourth, we use light and transmission electron microscopy comparative analyses of wild type versus lavender corn snakes and show that the color-producing endosomes of all chromatophores are substantially affected in the LYST mutant. Our work provides evidence characterizing xanthosomes in xanthophores and iridosomes in iridophores as lysosome-related organelles. | ||
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| 700 | 1 | |a Burgelin, Ingrid |e VerfasserIn |4 aut | |
| 700 | 1 | |a Debry, Adrien |e VerfasserIn |4 aut | |
| 700 | 1 | |a Langrez, Carine |e VerfasserIn |4 aut | |
| 700 | 1 | |a Montange, Florent |e VerfasserIn |4 aut | |
| 700 | 1 | |a Peraldi, Rodrigue |e VerfasserIn |4 aut | |
| 700 | 1 | |a Daraspe, Jean |e VerfasserIn |4 aut | |
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| 700 | 1 | |a Tzika, Athanasia C. |e VerfasserIn |4 aut | |
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