6533b821fe1ef96bd127c429

RESEARCH PRODUCT

DNA-methylation dependent regulation of embryo-specific 5S ribosomal DNA cluster transcription in adult tissues of sea urchin Paracentrotus lividus

Fabio CaradonnaEufrosina DimarcoFlores NaselliDaniele Bellavia

subject

Embryo NonmammalianTranscription GeneticBase pairDNA RibosomalParacentrotus lividusEpigenesis Geneticsea urchin5S ribosomal RNASingle-Strand conformation polymorphism (SSCP)Transcription (biology)biology.animalGeneticsAnimalsGene SilencingSea urchinRibosomal DNAPolymorphism Single-Stranded ConformationalGeneticsbiologyRNA Ribosomal 5SDNA Methylation5S ribosomal RNARibosomal RNAbiology.organism_classificationSettore BIO/18 - GeneticaOrgan Specificity5S ribosomal genesilencingDNA methylationAzacitidineOocytesParacentrotusFemaleepigenetic

description

Abstract We have previously reported a molecular and cytogenetic characterization of three different 5S rDNA clusters in the sea urchin Paracentrotus lividus and recently, demonstrated the presence of high heterogeneity in functional 5S rRNA. In this paper, we show some important distinctive data on 5S rRNA transcription for this organism. Using single strand conformation polymorphism (SSCP) analysis, we demonstrate the existence of two classes of 5S rRNA, one which is embryo-specific and encoded by the smallest (700 bp) cluster and the other which is expressed at every stage and encoded by longer clusters (900 and 950 bp). We also demonstrate that the embryo-specific class of 5S rRNA is expressed in oocytes and embryonic stages and is silenced in adult tissue and that this phenomenon appears to be due exclusively to DNA methylation, as indicated by sensitivity to 5-azacytidine, unlike Xenopus where this mechanism is necessary but not sufficient to maintain the silenced status.

yearjournalcountryeditionlanguage
2013-10-01Genomics
https://doi.org/10.1016/j.ygeno.2013.08.001