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ID 116893
Author
Ylla, Guillem Harvard University
Nakamura, Taro Harvard University|National Institute for Basic Biology
Itoh, Takehiko Tokyo Institute of Technology
Kajitani, Rei Tokyo Institute of Technology
Toyoda, Atsushi National Institute of Genetics
Tomonari, Sayuri Tokushima University
Bando, Tetsuya Okayama University
Matsuoka, Yuji Tokushima University|National University of Singapore
Barnett, Austen A. Harvard University|DeSales University
Extavour, Cassandra G. Harvard University
Content Type
Journal Article
Description
Most of our knowledge of insect genomes comes from Holometabolous species, which undergo complete metamorphosis and have genomes typically under 2 Gb with little signs of DNA methylation. In contrast, Hemimetabolous insects undergo the presumed ancestral process of incomplete metamorphosis, and have larger genomes with high levels of DNA methylation. Hemimetabolous species from the Orthopteran order (grasshoppers and crickets) have some of the largest known insect genomes. What drives the evolution of these unusual insect genome sizes, remains unknown. Here we report the sequencing, assembly and annotation of the 1.66-Gb genome of the Mediterranean field cricket Gryllus bimaculatus, and the annotation of the 1.60-Gb genome of the Hawaiian cricket Laupala kohalensis. We compare these two cricket genomes with those of 14 additional insects and find evidence that hemimetabolous genomes expanded due to transposable element activity. Based on the ratio of observed to expected CpG sites, we find higher conservation and stronger purifying selection of methylated genes than non-methylated genes. Finally, our analysis suggests an expansion of the pickpocket class V gene family in crickets, which we speculate might play a role in the evolution of cricket courtship, including their characteristic chirping.
Journal Title
Communications Biology
ISSN
23993642
Publisher
Springer Nature
Volume
4
Start Page
733
Published Date
2021-06-14
Rights
This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
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DOI (Published Version)
URL ( Publisher's Version )
FullText File
cb_4_733.pdf 2.11 MB
language
eng
TextVersion
Publisher
departments
Technical Support Department
Bioscience and Bioindustry
Science and Technology