ArticleMolecular ecology resources2025
Linkage Mapping vs. Association: A Comparison of Two RADseq-Based Approaches to Identify Markers for Homomorphic Sex Chromosomes in Large Genomes.
Article in Molecular ecology resources, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 3 papers.
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Who cites it
3 citing papers in PubMed.
- Unlocking Demography: Developing an eDNA-Based Toolkit to Measure Sex Ratios From Populations.Molecular ecology resources · 2026Article
- Identification of Y-chromosome Turnover in Newts Fails to Support a Sex Chromosome Origin for the Triturus Balanced Lethal System.Genome biology and evolution · 2025Article
- NewtCap: An Efficient Target Capture Approach to Boost Genomic Studies in Salamandridae (True Salamanders and Newts).Ecology and evolution · 2025Article
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Authors and funding
5 authors.
Funding
Abstract
Reliable tools for the identification of genetic sex are invaluable in many fields of biology, but their design requires knowledge of sex-linked sequences, which is lacking in many taxa. Restriction-site-associated DNA sequencing (RADseq) is widely used to identify sex-linked markers, but multiple distinct strategies are employed, and it is often not obvious which is most suitable. In this study, we compare two approaches for using RADseq to identify sex-linked markers. We use the common newt, Lissotriton vulgaris, as our study system, providing a challenging combination of homomorphic sex chromosomes and an exceptionally large genome. We attempt an associative approach, sequencing 60 adult newts of known-sex individuals, and compare this to a linkage mapping approach utilising a family of 146 offspring with unknown sex. After optimisation for a highly paralogous genome, the associative approach identifies five Y-chromosome-linked markers in L. vulgaris, and we design a robust PCR protocol for molecular sexing of four more related species. Via the linkage approach, we construct a high-density map featuring 10,763 markers, matching the observed karyotype of L. vulgaris and showing broad synteny with the Iberian ribbed newt (Pleurodeles waltl). However, without incorporating the markers identified via the association-based approach, we cannot confidently distinguish a sex-determining region in the linkage map, either by analysing marker density or by identifying clusters of paternal markers. We conclude that linkage mapping alone is unlikely to yield sex-linked markers in organisms with very small sex-determining regions, whereas association-based RADseq can still be effective under these conditions.
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