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Extreme heterochiasmy and high rates of sex-reversed recombination result in large yet homomorphic sex chromosomes in the Emei moustache toad.

Xie S, Li J, Chen W, Fong LJM, Huang C, Feng Y, Ai Q, Zhao M, Mank JE, Wu H.

Genome Res. 2025 Jun 2;35(6):1325-1336. doi:10.1101/gr.280161.124

Extreme heterochiasmy and high rates of sex-reversed recombination result in large yet homomorphic sex chromosomes in the Emei moustache toad.

“Population genetic data showed high rates of sex-reversed XY-type females, and recombination between the X and Y Chromosomes in these individuals helps maintain the integrity of sequence and gene expression on the Y Chromosome.” “Despite this large size and the assumption that inversions catalyze recombination suppression between the X and Y Chromosomes, we found little evidence of XY structural variation.” “High collinearity and similarity between X and Y haplotypes implicate a pre-existing pattern of low recombination itself, likely predating the origin of Chr 1 as the sex chromosomes, rather than structural variation, in sex chromosome formation.”

Conservation of regulatory elements with highly diverged sequences across large evolutionary distances.

Nat Genet. 2025 Jun;57(6):1524-1534. doi: 10.1038/s41588-025-02202-5

Phan MHQ, Zehnder T, Puntieri F, Magg A, Majchrzycka B, Antonović M, Wieler H, Lo BW, Baranasic D, Lenhard B, Müller F, Vingron M, Ibrahim DM.

Conservation of regulatory elements with highly diverged sequences across large evolutionary distances.

“Interspecies point projection (IPP) [is] a synteny-based algorithm designed to map corresponding genomic locations in highly diverged genomes”. “We term [...] sequence-diverged orthologs ‘indirectly conserved’ (IC)”

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Still waters run deep in large-scale genome rearrangements of morphologically conservative Polyplacophora

Julia D Sigwart, Yunlong Li, Zeyuan Chen, Katarzyna Vončina, Jin Sun

Elife 2025 Apr 17:13:RP102542. doi:10.7554/eLife.102542

Still waters run deep in large-scale genome rearrangements of morphologically conservative Polyplacophora

“Heterozygocity ranging from almost 1% in Deshayesiella to 4.12% in Callochiton” “There are major changes [of karyotype] between congeners in different ocean basins (the Pacific A. rubrolineata) but also between two species in the NE Atlantic (A. discrepans and A. crinita) that are morphologically and ecologically almost indistinguishable.” “Living species of Lepidopleurida retain more plesiomorphic morphology and this clade has a deep fossil record extending to the lower Carboniferous; yet the exemplar of this order shows the most deviations from the reconstructed ancestral karyotype.”

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Laboratory evolution of the bacterial genome structure through insertion sequence activation.

Kanai Y, Shibai A, Yokoi N, Tsuru S, Furusawa C.

Nucleic Acids Res. 2025 May 10;53(9):gkaf331. doi:10.1093/nar/gkaf331

Laboratory evolution of the bacterial genome structure through insertion sequence activation.

“we developed an E. coli strain with high IS activity and demonstrated rapid IS-mediated genome evolution under relaxed selection in the laboratory, simulating the natural evolution of symbionts and pathogens. In just ten weeks, we observed numerous IS insertions, IS-mediated duplications, and deletions, contributing to at most −4.4% to 9.2% genome size changes (Fig. 4).” “We detected a total of 457 large-scale rearrangements, including 54 inversions, 363 deletions, and 40 duplications. [...] The median size of inversions was 84 kbp (range: 2.2 kbp–1.7 Mbp). All three inversions exceeding 1 Mbp were nearly symmetric to the ori-ter axis, consistent with observations of large inversions in nature. [...] Deletions ranged from 102 bp to 163 kbp (Fig. 3C), with the largest deletion being a deletion of a duplicated region. [...] Duplications had a median size of 40 kbp (range: 4830 bp–372 kbp). Surprisingly, the majority of the duplications resulted from transpositions of composite transposons with a copy of IS at each end (25/40), rather than tandem duplications. [...] The rearrangements led to genome size changes ranging from 174 kbp reduction to 369 kbp increase or −4.4% to 9.2%. However, overall, deletions were offset by the genome size increase from duplications and IS insertions, resulting in negligible changes in the median genome sizes”

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Nuevos registros de Appendicularia (Urochordata) y otras especies de zooplancton en el Pacífico tropical mexicano

Sandoval-Navarrete, C. A., Hernández-Márquez, S., Zamudio-Resendiz, M. E. ., Núñez-Resendiz, M. L. ., Márquez-Valdelamar, L. M. ., & Sentíes, A

Acta Zoológica Lilloana, 68(2), 309–341. doi:10.30550/j.azl/1974

Nuevos registros de Appendicularia (Urochordata) y otras especies de zooplancton en el Pacífico tropical mexicano

“the first molecular confirmation of Oikopleuradioicain Mexico stands out, revealing high genetic similarity with populations in Japan, highlighting the shared distribution between the northeastern and northwestern parts of the Pacific Ocean.”

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Large-scale genomic rearrangements boost SCRaMbLE in Saccharomyces cerevisiae.

Cheng L, Zhao S, Li T, Hou S, Luo Z, Xu J, Yu W, Jiang S, Monti M, Schindler D, Zhang W, Hou C, Ma Y, Cai Y, Boeke JD, Dai J.

Nat Commun. 2024 Jan 26;15(1):770. doi:10.1038/s41467-023-44511-5

Large-scale genomic rearrangements boost SCRaMbLE in Saccharomyces cerevisiae.

“SparLox83R, a yeast strain containing 83 loxPsym sites distributed across all 16 chromosomes” “LOH and aneuploidy are frequently detected in SCRaMbLEd heterozygous diploids” “the proportion of rearrangement events was 10-fold higher in haploid than in diploid cells.”

DNA Conserved in Diverse Animals Since the Precambrian Controls Genes for Embryonic Development

Frith MC, Ni S.

Mol Biol Evol. 2023 Dec 1;40(12):msad275. doi: 10.1093/molbev/msad275

DNA Conserved in Diverse Animals Since the Precambrian Controls Genes for Embryonic Development.

“Here, we report 25 regulatory DNA segments conserved across bilaterian animals, of which 7 are also conserved in cnidaria (coral and sea anemone).” “On the other hand, no conserved segments were found in fly (Drosophila melanogaster), roundworm (Caenorhabditis elegans), or leech (Helobdella robusta).”

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