A chromosome-level genome assembly of <i>Platycladus orientalis</i> and comparative genomics reveal pivotal roles of transposable elements in gene duplication and pseudogenization across gymnosperm giga-genomes. Bao, Y., Zhang, R., Liu, H., Li, Z., Jiao, S., Jia, K., Zhou, S., Nie, S., Yan, X., Shi, T., Tian, X., Zhao, S., Kong, L., Chen, Z., Ma, H., Yang, X., Chen, C., El-Kassaby, Y. A., Porth, I., Wang, X., Mao, J., & Zhao, W. Plant Communications, 7(8):101814, August, 2026. ![A chromosome-level genome assembly of <i>Platycladus orientalis</i> and comparative genomics reveal pivotal roles of transposable elements in gene duplication and pseudogenization across gymnosperm giga-genomes [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Gymnosperms, particularly conifers, exhibit a high abundance of transposable elements (TEs) in their giga-scale genomes. TEs interact both antagonistically and cooperatively with the host genome, promoting structural and genetic innovations across evolutionary lineages. However, how TEs shape the coding space of gymnosperm genomes remains a key unresolved question. Here, we present a high-quality genome assembly for the keystone conifer Platycladus orientalis, with a contig N50 of 57.54 Mb—the highest continuity reported to date—to investigate the role of TEs. Comparative genomics confirms the absence of recent whole-genome duplication and the presence of genome expansion in gymnosperms, revealing complex interactions among recurrent TE proliferation, low DNA removal rates, and DNA methylation-mediated silencing. Computational evidence indicates that TE-mediated gene duplication and pseudogenization provide a genetic basis for adaptive evolution and functional innovation, significantly shaping gene family dynamics and the emergence of species-specific genes. Additionally, TEs capture and duplicate an average of ∼400,000 coding gene fragments per gymnosperm genome, facilitating exon shuffling and triggering epigenetic conflicts between source genes and captured exon fragments. Genes from which fragments are captured (donor genes) show significantly higher levels of exon methylation than genes not captured by TEs (free genes), whereas syntenic donor genes exhibit lower levels of silencing responses than non-syntenic donor genes. This study provides valuable genomic resources and offers insights into the evolutionary patterns and principles underlying the large genome size and complexity of gymnosperms.
@article{bao_chromosome-level_2026,
title = {A chromosome-level genome assembly of \textit{{Platycladus} orientalis} and comparative genomics reveal pivotal roles of transposable elements in gene duplication and pseudogenization across gymnosperm giga-genomes},
volume = {7},
issn = {2590-3462},
url = {https://www.sciencedirect.com/science/article/pii/S2590346226001227},
doi = {10.1016/j.xplc.2026.101814},
abstract = {Gymnosperms, particularly conifers, exhibit a high abundance of transposable elements (TEs) in their giga-scale genomes. TEs interact both antagonistically and cooperatively with the host genome, promoting structural and genetic innovations across evolutionary lineages. However, how TEs shape the coding space of gymnosperm genomes remains a key unresolved question. Here, we present a high-quality genome assembly for the keystone conifer Platycladus orientalis, with a contig N50 of 57.54 Mb—the highest continuity reported to date—to investigate the role of TEs. Comparative genomics confirms the absence of recent whole-genome duplication and the presence of genome expansion in gymnosperms, revealing complex interactions among recurrent TE proliferation, low DNA removal rates, and DNA methylation-mediated silencing. Computational evidence indicates that TE-mediated gene duplication and pseudogenization provide a genetic basis for adaptive evolution and functional innovation, significantly shaping gene family dynamics and the emergence of species-specific genes. Additionally, TEs capture and duplicate an average of ∼400,000 coding gene fragments per gymnosperm genome, facilitating exon shuffling and triggering epigenetic conflicts between source genes and captured exon fragments. Genes from which fragments are captured (donor genes) show significantly higher levels of exon methylation than genes not captured by TEs (free genes), whereas syntenic donor genes exhibit lower levels of silencing responses than non-syntenic donor genes. This study provides valuable genomic resources and offers insights into the evolutionary patterns and principles underlying the large genome size and complexity of gymnosperms.},
number = {8},
urldate = {2026-08-17},
journal = {Plant Communications},
author = {Bao, Yu-Tao and Zhang, Ren-Gang and Liu, Hui and Li, Zhi-Chao and Jiao, Si-Qian and Jia, Kai-Hua and Zhou, Shan-Shan and Nie, Shuai and Yan, Xue-Mei and Shi, Tian-Le and Tian, Xue-Chan and Zhao, Shi-Wei and Kong, Lei and Chen, Zhao-Yang and Ma, Hai-Yao and Yang, Xiao-Lei and Chen, Charles and El-Kassaby, Yousry Aly and Porth, Ilga and Wang, Xiao-Ru and Mao, Jian-Feng and Zhao, Wei},
month = aug,
year = {2026},
keywords = {gene duplication, gene fragment capture, genome expansion, gymnosperms, pseudogenization, transposable elements},
pages = {101814},
}
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A.","Porth, I.","Wang, X.","Mao, J.","Zhao, W."],"bibdata":{"bibtype":"article","type":"article","title":"A chromosome-level genome assembly of <i>Platycladus orientalis</i> and comparative genomics reveal pivotal roles of transposable elements in gene duplication and pseudogenization across gymnosperm giga-genomes","volume":"7","issn":"2590-3462","url":"https://www.sciencedirect.com/science/article/pii/S2590346226001227","doi":"10.1016/j.xplc.2026.101814","abstract":"Gymnosperms, particularly conifers, exhibit a high abundance of transposable elements (TEs) in their giga-scale genomes. TEs interact both antagonistically and cooperatively with the host genome, promoting structural and genetic innovations across evolutionary lineages. However, how TEs shape the coding space of gymnosperm genomes remains a key unresolved question. Here, we present a high-quality genome assembly for the keystone conifer Platycladus orientalis, with a contig N50 of 57.54 Mb—the highest continuity reported to date—to investigate the role of TEs. Comparative genomics confirms the absence of recent whole-genome duplication and the presence of genome expansion in gymnosperms, revealing complex interactions among recurrent TE proliferation, low DNA removal rates, and DNA methylation-mediated silencing. Computational evidence indicates that TE-mediated gene duplication and pseudogenization provide a genetic basis for adaptive evolution and functional innovation, significantly shaping gene family dynamics and the emergence of species-specific genes. Additionally, TEs capture and duplicate an average of ∼400,000 coding gene fragments per gymnosperm genome, facilitating exon shuffling and triggering epigenetic conflicts between source genes and captured exon fragments. Genes from which fragments are captured (donor genes) show significantly higher levels of exon methylation than genes not captured by TEs (free genes), whereas syntenic donor genes exhibit lower levels of silencing responses than non-syntenic donor genes. This study provides valuable genomic resources and offers insights into the evolutionary patterns and principles underlying the large genome size and complexity of gymnosperms.","number":"8","urldate":"2026-08-17","journal":"Plant Communications","author":[{"propositions":[],"lastnames":["Bao"],"firstnames":["Yu-Tao"],"suffixes":[]},{"propositions":[],"lastnames":["Zhang"],"firstnames":["Ren-Gang"],"suffixes":[]},{"propositions":[],"lastnames":["Liu"],"firstnames":["Hui"],"suffixes":[]},{"propositions":[],"lastnames":["Li"],"firstnames":["Zhi-Chao"],"suffixes":[]},{"propositions":[],"lastnames":["Jiao"],"firstnames":["Si-Qian"],"suffixes":[]},{"propositions":[],"lastnames":["Jia"],"firstnames":["Kai-Hua"],"suffixes":[]},{"propositions":[],"lastnames":["Zhou"],"firstnames":["Shan-Shan"],"suffixes":[]},{"propositions":[],"lastnames":["Nie"],"firstnames":["Shuai"],"suffixes":[]},{"propositions":[],"lastnames":["Yan"],"firstnames":["Xue-Mei"],"suffixes":[]},{"propositions":[],"lastnames":["Shi"],"firstnames":["Tian-Le"],"suffixes":[]},{"propositions":[],"lastnames":["Tian"],"firstnames":["Xue-Chan"],"suffixes":[]},{"propositions":[],"lastnames":["Zhao"],"firstnames":["Shi-Wei"],"suffixes":[]},{"propositions":[],"lastnames":["Kong"],"firstnames":["Lei"],"suffixes":[]},{"propositions":[],"lastnames":["Chen"],"firstnames":["Zhao-Yang"],"suffixes":[]},{"propositions":[],"lastnames":["Ma"],"firstnames":["Hai-Yao"],"suffixes":[]},{"propositions":[],"lastnames":["Yang"],"firstnames":["Xiao-Lei"],"suffixes":[]},{"propositions":[],"lastnames":["Chen"],"firstnames":["Charles"],"suffixes":[]},{"propositions":[],"lastnames":["El-Kassaby"],"firstnames":["Yousry","Aly"],"suffixes":[]},{"propositions":[],"lastnames":["Porth"],"firstnames":["Ilga"],"suffixes":[]},{"propositions":[],"lastnames":["Wang"],"firstnames":["Xiao-Ru"],"suffixes":[]},{"propositions":[],"lastnames":["Mao"],"firstnames":["Jian-Feng"],"suffixes":[]},{"propositions":[],"lastnames":["Zhao"],"firstnames":["Wei"],"suffixes":[]}],"month":"August","year":"2026","keywords":"gene duplication, gene fragment capture, genome expansion, gymnosperms, pseudogenization, transposable elements","pages":"101814","bibtex":"@article{bao_chromosome-level_2026,\n\ttitle = {A chromosome-level genome assembly of \\textit{{Platycladus} orientalis} and comparative genomics reveal pivotal roles of transposable elements in gene duplication and pseudogenization across gymnosperm giga-genomes},\n\tvolume = {7},\n\tissn = {2590-3462},\n\turl = {https://www.sciencedirect.com/science/article/pii/S2590346226001227},\n\tdoi = {10.1016/j.xplc.2026.101814},\n\tabstract = {Gymnosperms, particularly conifers, exhibit a high abundance of transposable elements (TEs) in their giga-scale genomes. TEs interact both antagonistically and cooperatively with the host genome, promoting structural and genetic innovations across evolutionary lineages. However, how TEs shape the coding space of gymnosperm genomes remains a key unresolved question. Here, we present a high-quality genome assembly for the keystone conifer Platycladus orientalis, with a contig N50 of 57.54 Mb—the highest continuity reported to date—to investigate the role of TEs. Comparative genomics confirms the absence of recent whole-genome duplication and the presence of genome expansion in gymnosperms, revealing complex interactions among recurrent TE proliferation, low DNA removal rates, and DNA methylation-mediated silencing. Computational evidence indicates that TE-mediated gene duplication and pseudogenization provide a genetic basis for adaptive evolution and functional innovation, significantly shaping gene family dynamics and the emergence of species-specific genes. Additionally, TEs capture and duplicate an average of ∼400,000 coding gene fragments per gymnosperm genome, facilitating exon shuffling and triggering epigenetic conflicts between source genes and captured exon fragments. Genes from which fragments are captured (donor genes) show significantly higher levels of exon methylation than genes not captured by TEs (free genes), whereas syntenic donor genes exhibit lower levels of silencing responses than non-syntenic donor genes. This study provides valuable genomic resources and offers insights into the evolutionary patterns and principles underlying the large genome size and complexity of gymnosperms.},\n\tnumber = {8},\n\turldate = {2026-08-17},\n\tjournal = {Plant Communications},\n\tauthor = {Bao, Yu-Tao and Zhang, Ren-Gang and Liu, Hui and Li, Zhi-Chao and Jiao, Si-Qian and Jia, Kai-Hua and Zhou, Shan-Shan and Nie, Shuai and Yan, Xue-Mei and Shi, Tian-Le and Tian, Xue-Chan and Zhao, Shi-Wei and Kong, Lei and Chen, Zhao-Yang and Ma, Hai-Yao and Yang, Xiao-Lei and Chen, Charles and El-Kassaby, Yousry Aly and Porth, Ilga and Wang, Xiao-Ru and Mao, Jian-Feng and Zhao, Wei},\n\tmonth = aug,\n\tyear = {2026},\n\tkeywords = {gene duplication, gene fragment capture, genome expansion, gymnosperms, pseudogenization, transposable elements},\n\tpages = {101814},\n}\n\n\n\n","author_short":["Bao, Y.","Zhang, R.","Liu, H.","Li, Z.","Jiao, S.","Jia, K.","Zhou, S.","Nie, S.","Yan, X.","Shi, T.","Tian, X.","Zhao, S.","Kong, L.","Chen, Z.","Ma, H.","Yang, X.","Chen, C.","El-Kassaby, Y. 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