Classification Problems of Repetitive DNA Sequences

Repetitive DNA sequences, satellite DNAs (satDNAs) and transposable elements (TEs) are essential components of the genome landscape, with many different roles in function evolution. Despite significant advances sequencing technologies bioinformatics tools, detection classification repetitive sequences can still be an obstacle to analysis genomic repeats. Here, we summarize how specificities organizational patterns lead inability classify (and study) a fraction bivalve mollusk sequences. We suggest that main reasons for this are: predominant association satDNA arrays Helitron/Helentron TEs; existence complex loci; unusual, highly scattered organization short or single monomers across whole genome. The genomes confirm need introducing diverse organisms as models order understand all aspects biology. It is expected further development techniques synergy among tools databases will enable quick unambiguous characterization assembled genomes.