ArticlePLoS genetics2024
Genomic evidence reveals three W-autosome fusions in Heliconius butterflies.
Article in PLoS genetics, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed.
- Ancient inversion polymorphisms are locally adaptive in a widespread butterfly species.Science advances · 2026Article
- de novo Assembly of five Highly Contiguous Heliconius Butterfly Genomes With Long-Read Sequencing Alone.Genome biology and evolution · 2026Article
- Molecular mechanisms of sex determination in Lepidoptera: current status and perspectives.Insect science · 2026Review
- Genetic parallelism underpins convergent mimicry coloration in Lepidoptera across 120 million years of evolution.PLoS biology · 2026Article
- Genealogical Analysis of Replicate Flower Colour Hybrid Zones in Antirrhinum.Molecular ecology · 2025Article
- Genomics of Neotropical biodiversity indicators: Two butterfly radiations with rampant chromosomal rearrangements and hybridization.Proceedings of the National Academy of Sciences of the United States of America · 2025Article
- Rewinding the Ratchet: Rare Recombination Locally Rescues Neo-W Degeneration and Generates Plateaus of Sex-Chromosome Divergence.Molecular biology and evolution · 2024Article
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Authors and funding
12 authors.
Funding
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Abstract
Sex chromosomes are evolutionarily labile in many animals and sometimes fuse with autosomes, creating so-called neo-sex chromosomes. Fusions between sex chromosomes and autosomes have been proposed to reduce sexual conflict and to promote adaptation and reproductive isolation among species. Recently, advances in genomics have fuelled the discovery of such fusions across the tree of life. Here, we discovered multiple fusions leading to neo-sex chromosomes in the sapho subclade of the classical adaptive radiation of Heliconius butterflies. Heliconius butterflies generally have 21 chromosomes with very high synteny. However, the five Heliconius species in the sapho subclade show large variation in chromosome number ranging from 21 to 60. We find that the W chromosome is fused with chromosome 4 in all of them. Two sister species pairs show subsequent fusions between the W and chromosomes 9 or 14, respectively. These fusions between autosomes and sex chromosomes make Heliconius butterflies an ideal system for studying the role of neo-sex chromosomes in adaptive radiations and the degeneration of sex chromosomes over time. Our findings emphasize the capability of short-read resequencing to detect genomic signatures of fusion events between sex chromosomes and autosomes even when sex chromosomes are not explicitly assembled.
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