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Published on: June 13, 2020
An eutherian intronic sequence gave rise to a major satellite DNA in Platyrrhini
Mirela Pelizaro Valeri1, Guilherme Borges Dias1, Valéria do Socorro Pereira2
1Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
Abstract:
Satellite DNAs (satDNAs) are major components of eukaryote genomes. However, because of their quick divergence, the evolutionary origin of a given satDNA family can rarely be determined. Herein we took advantage of available primate sequenced genomes to determine the origin of the CapA satDNA (approx. 1500 bp long monomers), first described in the tufted capuchin monkey Sapajus apella We show that CapA is an abundant satDNA in Platyrrhini, whereas in the genomes of most eutherian mammals, including humans, this sequence is present only as a single copy located within a large intron of the NOS1AP (nitric oxide synthase 1 adaptor protein) gene. Our data suggest that this intronic CapA-like sequence gave rise to the CapA satDNA and we discuss possible mechanisms implicated in this event. This is the first report to our knowledge of a single copy intronic sequence giving origin to a satDNA that reaches up to 100 000 copies in some genomes.
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