Cerastoderma glaucum 5S ribosomal DNA: Characterization of the repeat unit, divergence with respect to Cerastoderma edule, and PCR-RFLPs for the identification of both cockles
Genome, ISSN: 0831-2796, Vol: 48, Issue: 3, Page: 427-442
2005
- 20Citations
- 22Captures
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Metrics Details
- Citations20
- Citation Indexes20
- 20
- CrossRef19
- Captures22
- Readers22
- 22
Article Description
The 5S rDNA repeat unit of the cockle Cerastoderma glaucum from the Mediterranean and Baltic coasts was PCR amplified and sequenced. The length of the units was 539-568 bp, of which 120 bp were assigned to the 5S rRNA gene and 419-448 bp to the spacer region, and the G/C content was 46%-49%, 54%, and 44%-47%, respectively. Two types of units (A and B), differing in the spacer, were distinguished based on the percentage of differences and clustering in phylogenetic trees. A PCR assay with specific primers for each unit type indicated that the occurrence of both units is not restricted to the sequenced individuals. The 5S rDNA units of C. glaucum were compared with new and previously reported sequences of Cerastoderma edule. The degree of variation observed in C. edule was lower than that in C. glaucum and evidence for the existence of units A and B in C. edule was not found. The two cockles have the same coding region but displayed numerous fixed differences in the spacer region and group separately in the phylogenetic trees. Digestion of the 5S rDNA PCR product with the restriction enzymes HaeIII and EcoRV revealed two RFLPs useful for cockle identification. © 2005 NRC.
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