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Author Ross, Joseph A. ♦ Urton, James R. ♦ Bol, Jessica ♦ Shapiro, Michael D. ♦ Peichel, Catherine L.
Source CiteSeerX
Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Sex Chromosome ♦ Stickleback Fish ♦ Related Specie ♦ Heteromorphic Xy Pair ♦ Fourspine Stickleback ♦ Rapid Turnover ♦ Black-spotted Stickleback ♦ Sex-determination Gene ♦ Evolutionary Transition ♦ Ninespine Stickleback ♦ Rich Comparative ♦ Sex-chromosome System ♦ New Sex-determination Gene ♦ Different System ♦ Diverse Sex-chromosome System ♦ Teleost Fish ♦ Molecular Cytogenetics ♦ Lg19-derived Chromosome ♦ Genetic Mapping ♦ Culaea Inconstans ♦ Gasterosteus Aculeatus ♦ Detailed Comparison ♦ Multiple Stickleback Specie ♦ Sex-chromosome Diversity ♦ Heteromorphic Zw Sex-chromosome Pair ♦ Male Threespine Stickleback Fish ♦ X1x2y Sex-determination System ♦ Several Mechanism ♦ Pungitius Pungitius ♦ Brook Stickleback
Abstract Diverse sex-chromosome systems are found in vertebrates, particularly in teleost fishes, where different systems can be found in closely related species. Several mechanisms have been proposed for the rapid turnover of sex chromosomes, including the transposition of an existing sex-determination gene, the appearance of a new sex-determination gene on an autosome, and fusions between sex chromosomes and autosomes. To better understand these evolutionary transitions, a detailed comparison of sex chromosomes between closely related species is essential. Here, we used genetic mapping and molecular cytogenetics to characterize the sex-chromosome systems of multiple stickleback species (Gasterosteidae). Previously, we demonstrated that male threespine stickleback fish (Gasterosteus aculeatus) have a heteromorphic XY pair corresponding to linkage group (LG) 19. In this study, we found that the ninespine stickleback (Pungitius pungitius) has a heteromorphic XY pair corresponding to LG12. In black-spotted stickleback (G. wheatlandi) males, one copy of LG12 has fused to the LG19-derived Y chromosome, giving rise to an X1X2Y sex-determination system. In contrast, neither LG12 nor LG19 is linked to sex in two other species: the brook stickleback (Culaea inconstans) and the fourspine stickleback (Apeltes quadracus). However, we confirmed the existence of a previously reported heteromorphic ZW sex-chromosome pair in the fourspine stickleback. The sex-chromosome diversity that we have uncovered in sticklebacks provides a rich comparative
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study