Satellite DNA is an inseparable fellow traveller of B chromosomes

Camacho, Juan Pedro M., Ruiz-Ruano, Francisco J. ORCID:, López-León, María Dolores and Cabrero, Josefa (2021) Satellite DNA is an inseparable fellow traveller of B chromosomes. In: Satellite DNAs in Physiology and Evolution. Progress in molecular and subcellular biology, 60 . Springer, pp. 85-102. ISBN 978-3-030-74888-3

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Next-Generation Sequencing (NGS) has revealed that B chromosomes in several species are enriched in repetitive DNA, mostly satellite DNA (satDNA). This raises the question of whether satDNA is important to B chromosomes for functional reasons or else its abundance on Bs is simply a consequence of properties of B chromosomes such as their dispensability and late replication. Here we review current knowledge in this respect and contextualize it within the frame of practical difficulties to perform this kind of research, the most important being the absence of good full genome sequencing for B-carrying species, which is an essential requisite to ascertain the intragenomic origin of B chromosomes. Our review analysis on 16 species revealed that 38% of them showed B-specific satDNAs whereas only one of them (6%) carried an inter-specifically originated B chromosome. This shows that B-specific satDNA families can eventually evolve in intraspecifically arisen B chromosomes. Finally, the possibility of satDNA accumulation on B chromosomes for functional reasons is exemplified by B chromosomes in rye, as they contain B-specific satDNAs which are transcribed and occupy chromosome locations where they might facilitate the kind of drive shown by this B chromosome during pollen grain mitosis.

Item Type: Book Section
Uncontrolled Keywords: b chromosome,heterochromatin,repeatome,satellite dna,medicine(all) ,/dk/atira/pure/subjectarea/asjc/2700
Faculty \ School: Faculty of Science > School of Biological Sciences
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Depositing User: LivePure Connector
Date Deposited: 21 Sep 2021 00:29
Last Modified: 30 Jan 2024 03:57
DOI: 10.1007/978-3-030-74889-0_4

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