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.
journal_name
Genomicsjournal_title
Genomicsauthors
Bellavia D,Dimarco E,Naselli F,Caradonna Fdoi
10.1016/j.ygeno.2013.08.001subject
Has Abstractpub_date
2013-10-01 00:00:00pages
397-402issue
4eissn
0888-7543issn
1089-8646pii
S0888-7543(13)00152-3journal_volume
102pub_type
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