AI Article Synopsis
- Satellite DNAs (satDNAs) are repeated DNA sequences found in eukaryotic genomes, contributing to a species' "satellitome" which can include up to hundreds of families.
- Recent advancements in next-generation sequencing (NGS) and bioinformatics have allowed researchers to analyze and compare satDNAs across different species at lower costs.
- The study focused on two novel satDNAs in characid fish, revealing that one (MsaSat03) is common across species while the other (MsaSat04) varies significantly between populations, highlighting the complex evolutionary dynamics of satDNA in these fish.
Article Abstract
Satellite DNAs (satDNAs) are tandemly repeated DNA sequences with great abundance in eukaryotic genomes. A single species may carry up to hundreds of satDNA families, which is collectively called as "satellitome," each showing its own dynamics and evolution rates. In this context, all live species contain a satDNA library that may be partially or totally shared with other related species/populations. In the late few years, next-generation sequencing (NGS) and novel bioinformatic tools facilitated the massive characterization of these sequences at low costs, and consequently, comparing satDNAs between species. In this study, we characterized two novel satDNAs (MsaSat03-80 and MsaSat04-142) in three characid fish ( and and two populations of ) and mapped their chromosomal location to unveil the evolutionary dynamics of satDNA repeats in those species. Our results evidenced that MsaSat03 is present in the genomes of all analyzed species, but is clustered only in the chromosomes of , exhibiting a conserved number and location of sites. Conversely, MsaSat04 sequences is restricted to and shows a differential distribution between the two analyzed populations. Altogether, our analyses point to a complex history of satDNA families in characid fish and the utility of NGS data for comparative satDNA analysis.
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| http://dx.doi.org/10.1089/zeb.2019.1738 | DOI Listing |
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