Cavefishes have long been used as model organisms showcasing adaptive diversification, but does adaptation to caves also facilitate the evolution of reproductive isolation from surface ancestors? Here, we study the sequence evolution and gene expression of the duplicated genes coding for androgen receptors ars and other pathway-related genes, i. This emphasizes that phylogenetic inferences based on gene order conservation are problematic when the exact evolutionary relationships of the genes remain uninvestigated. United States Apply by: Hence, it is not phylogenetically informative.
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The gonadal transcriptome of the unisexual Amazon molly Poecilia formosa in comparison to its sexual ancestors, Poecilia mexicana and Poecilia latipinna. At the moment, it is impossible to decide which of the two scenarios, ancient relationships or convergent evolution, applies to the two gene clusters. Gene pairs separated by no more than three genes with orthologs in six fungal taxa and H. Colonization of toxic springs drives predictable life-history shift in livebearing fishes Poeciliidae. A further 35 meiosis and reproduction related genes were not found in the P.
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Transcriptional activity of the mutant 3 Kb proximal Dmrt1bY promoter mutated Dmrt1 binding site was not significantly impaired while overexpressing dmrt1bY or not. Cultures of the Curatorial 2 Timing: It may therefore indeed comprise the archetype of animal and fungal sex determination. Many ways have been illustrated through which TEs can directly influence the regulation of nearby gene expression, both at the transcriptional and post-transcriptional levels for review see . Among all tested fungal and nonfungal species, only the zygomycetes are reported to have a gene order that is more similar to that of the microsporidia than it is expected by chance Lee et al. The dmrt1a gene, with its proposed specification and maintenance function for the Sertoli cells, is expressed only when the testes are in the process of differentiation.
In either case, shared ancestry or convergent evolution, the presence of the gene cluster in microsporidia and in zygomycetes represents at best a plesiomorphy. We also describe the gene expression pattern of the ars and pathway-related genes in various tissues i. Thank you for the service. The HMG-type transcription factors were omitted from this analysis because they lack any phylogenetic information Lee, Corradi, et al. Females from Texas had deeper bodies, a more terminal mouth, a larger head, and a slightly longer and deeper caudal-peduncle.