ArticleMolecular biology reports2005
Intragenomic variation in ribosomal RNA gene of the sea urchin Lytechinus variegatus.
Article in Molecular biology reports, 2005. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The first series of studies on the rDNA satellite of the sea urchin, Lytechinus variegatus, based on saturation hybridization of rRNA-rDNA and renaturation kinetics, showed that repeat length of rRNA gene was of about 8 kb in which there was no provision for NTS. The EM denaturation mapping, however, revealed (1) that the gene was 75% larger (longer) than 8 kb, within which there was a NTS whose length varied in repeating units, (3) and there was a region of high GC almost in the middle of the transcribed part. The suggestion of length and sequential heterogeneity in the gene copies coming from the first denaturation mapping prompted further studies with techniques so that the conclusions of the previous results could be stated with finality. The results that emanated from further studies established that the rDNA repeat length of L. variegatus was of about 12 kb and that the NTS ranged from 3.8 to 6.4 kb. Earlier demonstration of a moderately high-GC segment within the transcribed part was also confirmed by sequence analysis. However, the stipulations on the NTS regarding sequential and length heterogeneity, still awaits elucidation by sequence analysis.
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