Тип публикации: статья из журнала

Год издания: 2026

Идентификатор DOI: 10.1093/molbev/msag055

Аннотация: <jats:title>Abstract</jats:title> <jats:p>Most lepidopteran species have a WZ/ZZ sex chromosome system, suggesting a common origin. However, the exceptional variability of W chromosomes supports their multiple independent origins. Here, we investigated the genome of the recently formed species, Dendrolimus sibiricus, which is one oПоказать полностьюf the most devastating pests of the boreal forests in Northern Asia. We found that its karyotype consists of 30 pairs of chromosomes and follows the WZ/ZZ sex chromosome system. We produced a chromosome-scale assembly of its female genome and identified the sequences of both sex chromosomes. With the exception of the W chromosome, the D. sibiricus genome displays a very high degree of synteny with genomes of other Dendrolimus representatives. The non-conserved W chromosome is composed entirely of recently acquired sequences, mainly young genomic repeats and a few unique loci derived from subtelomeric regions of the same species' Z chromosome as well as from the genome of the endosymbiotic Wolbachia bacterium. It shares no common ancestral sequences with the W chromosomes of two related species, Dendrolimus tabulaeformis and Lasiocampa quercus. They, in turn, display a similar organization relative to the W of D. sibiricus, including Z-derived loci. The W of D. tabulaeformis also contained multiple fragments of the mitochondrial genome, as seen in classical B chromosomes. We conclude that W chromosomes arose from their Z counterparts recently and independently in these three species. We propose that this mechanism may be a common feature of lepidopteran evolution, counteracting the inevitable degeneration of a non-recombining chromosome through its repeated, complete turnover.</jats:p>

Журнал: Molecular Biology and Evolution

Выпуск журнала: Т.43, №3

ISSN журнала: 07374038

Издатель: Oxford University Press

• Shipova Aleksandra A (Institute of Cytology and Genetics SB RAS, Novosibirsk 630090,)
• Belousova Irina A (Institute of Systematics and Ecology of Animals SB RAS, Novosibirsk 630091,)
• Yakimova Maria E (Institute of Systematics and Ecology of Animals SB RAS, Novosibirsk 630091,)
• Kirichenko Natalia I (All-Russian Plant Quarantine Center (VNIIKR), Krasnoyarsk Branch, st. Zhelyabova, 6/6, Krasnoyarsk 660020,)
• Ageev Aleksandr A (Center of Forest Pyrology, All-Russia Research Institute of Silviculture and Mechanization of Forestry, Krupskoy 42, Krasnoyarsk 660062,)
• Cusson Michel (Department of Biochemistry, Microbiology and Bioinformatics, Laval University, Quebec City, Quebec,)
• Lukhtanov Vladimir A (Department of Karyosystematics, Zoological Institute of Russian Academy of Science, St. Petersburg,)
• Ershov Nikita I (Sirius University of Science and Technology, Sochi 354349,)
• Martemyanov Vyacheslav V (Institute of Systematics and Ecology of Animals SB RAS, Novosibirsk 630091,)

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