首页|Dominance of transposable element-related satDNAs results in great complexity of"satDNA library"and invokes the extension towards"repetitive DNA library"

Dominance of transposable element-related satDNAs results in great complexity of"satDNA library"and invokes the extension towards"repetitive DNA library"

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Research on bivalves is fast-growing,including genome-wide analyses and genome sequencing.Several characteristics qualify oysters as a valuable model to explore repetitive DNA sequences and their genome organization.Here we char-acterize the satellitomes of five species in the family Ostreidae(Crassostrea angulata,C.virginica,C.hongkongensis,C.ariakensis,Ostrea edulis),revealing a substantial number of satellite DNAs(satDNAs)per genome(ranging between 33 and 61)and peculiarities in the composition of their satellitomes.Numerous satDNAs were either associated to or derived from transposable elements,displaying a scarcity of transposable element-unrelated satDNAs in these genomes.Due to the non-conventional satellitome constitution and dominance of Helitron-associated satDNAs,comparative satellitomics demanded more in-depth analyses than standardly employed.Comparative analyses(including C.gigas,the first bivalve species with a defined satellitome)revealed that 13 satDNAs occur in all six oyster genomes,with Cg170/HindⅢ satDNA being the most abundant in all of them.Evaluating the"satDNA library model"highlighted the necessity to adjust this term when studying tandem repeat evolution in organisms with such satellitomes.When repetitive sequences with potential variation in the organizational form and repeat-type affiliation are examined across related species,the introduction of the terms"TE library"and"repetitive DNA library"becomes essential.

SatellitomeComparative satellitomicsHelitronBivalves"Dark matter of the genome"

Monika Tunjić-Cvitanić、Daniel García-Souto、Juan J.Pasantes、Eva Šatović-Vukšić

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Division of Molecular Biology,Ruđer Bošković Institute,10000 Zagreb,Croatia

Genomes and Disease,Centre for Research in Molecular Medicine and Chronic Diseases(CIMUS),Universidade de Santiago de Compostela,15706 Santiago de Compostela,Spain

Department of Zoology,Genetics and Physical Anthropology,Universidade de Santiago de Compostela,15706 Santiago de Compostela,Spain

Centro de Investigación Mariña,Dpto de Bioquímica,Xenética e Inmunoloxía,Universidade de Vigo,36310 Vigo,Spain

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2024

10.1007/s42995-024-00218-0

海洋生命科学与技术(英文)

海洋生命科学与技术(英文)

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年,卷(期)：2024.6(2)