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• W3081363962 abstract "Background The repeatome, the collection of repetitive DNA sequences represented by transposable elements (TEs) and tandemly repeated satellite DNA (satDNAs), is found in high proportion in organisms across the tree of life. Grasshoppers have large genomes (average 9 Gb), containing large amounts of repetitive DNA which has hampered progress in assembling reference genomes. Here we combined linked-read genomics with transcriptomics to assemble, characterize, and compare the structure of the repeatome and its contribution to genome evolution, in four chromosomal races of the morabine grasshopper Vandiemenella viatica species complex. Results We obtained linked-read genome assemblies of 2.73-3.27 Gb from estimated genome sizes of 4.26-5.07 Gb DNA per haploid genome of the four chromosomal races of V. viatica . These constitute the third largest insect genomes assembled so far (the largest being two locust grasshoppers). Combining complementary annotation tools and manual curation, we found a large diversity of TEs and satDNAs constituting 66 to 75 % per genome assembly. A comparison of sequence divergence within the TE classes revealed massive accumulation of recent TEs in all four races (314-463 Mb per assembly), indicating that their large genome size is likely due to similar rates of TE accumulation across the four races. Transcriptome sequencing showed more biased TE expression in reproductive tissues than somatic tissues, implying permissive transcription in gametogenesis. Out of 129 satDNA families, 102 satDNA families were shared among the four chromosomal races, which likely represent a repertoire of satDNA families in the ancestor of the V. viatica chromosomal races. Notably, 50 of these shared satDNA families underwent differential proliferation since the recent diversification of the V. viatica species complex. Conclusion In-depth annotation of the repeatome in morabine grasshoppers provided new insights into the genome evolution of Orthoptera. Our TEs analysis revealed a massive recent accumulation of TEs equivalent to the size of entire Drosophila genomes, which likely explains the large genome sizes in grasshoppers. Although the TE and satDNA repertoires were rather similar between races, the patterns of TE expression and satDNA proliferation suggest rapid evolution of grasshopper genomes on recent timescales." @default.
• W3081363962 created "2020-09-01" @default.
• W3081363962 creator A5013351025 @default.
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• W3081363962 creator A5059110923 @default.
• W3081363962 creator A5061067869 @default.
• W3081363962 creator A5089536043 @default.
• W3081363962 date "2020-08-22" @default.
• W3081363962 modified "2023-10-16" @default.
• W3081363962 title "Too much too many: comparative analysis of morabine grasshopper genomes reveals highly abundant transposable elements and rapidly proliferating satellite DNA repeats" @default.
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• W3081363962 doi "https://doi.org/10.1101/2020.08.22.247130" @default.

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