Turnover of sex chromosomes and speciation in fishes
Open accessAbstract
Closely related species of fishes often have different sex chromosome systems. Such rapid turnover of sex chromosomes can occur by several mechanisms, including fusions between an existing sex chromosome and an autosome. These fusions can result in a multiple sex chromosome system, where a species has both an ancestral and a neo-sex chromosome. Although this type of multiple sex chromosome system has been found in many fishes, little is known about the mechanisms that select for the formation of neo-sex chromosomes, or the role of neo-sex chromosomes in phenotypic evolution and speciation. The identification of closely related, sympatric species pairs in which one species has a multiple sex chromosome system and the other has a simple sex chromosome system provides an opportunity to study sex chromosome turnover. Recently, we found that a population of threespine stickleback (Gasterosteus aculeatus) from Japan has an X1X2Y multiple sex chromosome system resulting from a fusion between the ancestral Y chromosome and an autosome, while a sympatric threespine stickleback population has a simple XY sex chromosome system. Furthermore, we demonstrated that the neo-X chromosome (X 2) plays an important role in phenotypic divergence and reproductive isolation between these sympatric stickleback species pairs. Here, we review multiple sex chromosome systems in fishes, as well as recent advances in our understanding of the evolutionary role of sex chromosome turnover in stickleback speciation.
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Robertsonian fusions can result in the recruitment of autosomes into becoming sex chromosomes, as has been seen in fishes.
“On the scale of whole chromosomes, dramatic changes like Robertsonian fusions can result in the recruitment of autosomes into becoming sex chromosomes, as has been seen in fishes (155)”
From Topological Approaches in Animal Comparative Genomics (2026) · cites this paper as [155]
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Topological Approaches in Animal Comparative Genomics
Schultz, D. T., & Simakov, O. (2026) · Annual Review of Animal Biosciences · doi:10.1146/annurev-animal-030424-084541 · Cited by 1 · see citing works
- Authors
- Kitano, J., & Peichel, C. L.
- Affiliations
- National Institute of Genetics (JP)
- Fred Hutch Cancer Center (US)
- Corresponding author
- Kitano, Jun
- Venue
- Environmental Biology of Fishes
- Published
- 2011-06-04
- Volume
- 94
- Issue
- 3
- Pages
- 549-558
- ISSN
- 0378-1909 (ISSN-L)
- 1573-5133
- PMC
- PMC4459657
- OpenAlex
- W2137006372
- Cited by
- 178
- References
- 0
- Citations by year
- 2026: 8 · 2025: 13 · 2024: 14 · 2023: 10 · 2022: 13 · 2021: 10 · 2020: 18 · 2019: 18 · 2018: 8 · 2017: 9 · 2016: 12 · 2015: 9 · 2014: 25 · 2013: 9 · 2012: 1
- FWCI
- 6.70
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- cc-by-nc
- Locations
- Environmental Biology of Fishes (publishedVersion, cc-by-nc)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health
- Japan Society for the Promotion of Science (22770075)
- National Human Genome Research Institute (P50HG002568)
- National Institute of General Medical Sciences (R01GM071854)
- Precursory Research for Embryonic Science and Technology
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and Clinical Aspects of Sex Determination and Chromosomal Abnormalities
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Physiology › Reproductive biology and impacts on aquatic species
- Keywords
- sex chromosome turnover, multiple sex chromosome system, neo-sex chromosomes, Gasterosteus aculeatus, speciation, reproductive isolation, phenotypic divergence, sympatric species pairs, Y chromosome evolution, fish
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