Abstract:
:Satellite DNAs (satDNA) are tandemly arrayed repeated sequences largely present in eukaryotic genomes, which play important roles in genome evolution and function, and therefore, their analysis is vital. Here, we describe the isolation of a novel satellite DNA family (PMSat) from the rodent Peromyscus eremicus (Cricetidae, Rodentia), which is located in pericentromeric regions and exhibits a typical satellite DNA genome organization. Orthologous PMSat sequences were isolated and characterized from three species belonging to Cricetidae: Cricetus cricetus, Phodopus sungorus and Microtus arvalis. In these species, PMSat is highly conserved, with the absence of fixed species-specific mutations. Strikingly, different numbers of copies of this sequence were found among the species, suggesting evolution by copy number fluctuation. Repeat units of PMSat were also found in the Peromyscus maniculatus bairdii BioProject, but our results suggest that these repeat units are from genome regions outside the pericentromere. The remarkably high evolutionary sequence conservation along with the preservation of a few numbers of copies of this sequence in the analyzed genomes may suggest functional significance but a different sequence nature/organization. Our data highlight that repeats are difficult to analyze due to the limited tools available to dissect genomes and the fact that assemblies do not cover regions of constitutive heterochromatin.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Louzada S,Vieira-da-Silva A,Mendes-da-Silva A,Kubickova S,Rubes J,Adega F,Chaves Rdoi
10.1016/j.ympev.2015.06.008subject
Has Abstractpub_date
2015-11-01 00:00:00pages
193-203eissn
1055-7903issn
1095-9513pii
S1055-7903(15)00178-5journal_volume
92pub_type
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