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. 1990 Jun 11;18(11):3135–3145. doi: 10.1093/nar/18.11.3135

Structural analysis of the short length ribosomal DNA variant from Pisum sativum L. cv. Alaska.

K J Piller 1, S R Baerson 1, N O Polans 1, L S Kaufman 1
PMCID: PMC330916  PMID: 1972558

Abstract

The genomic clone, RRNpss1, representing the short ribosomal DNA length variant in Pisum sativum L. cv. Alaska, has been isolated and the 2859 bp intergenic spacer, along with the 25S rRNA 3' border and 18S rRNA 5' border, has been sequenced. The intergenic spacer contains nine tandem repeats, approximately 180 bp in length, which show greater than 80% sequence homology to each other. The RNA polymerase I transcription start site and a processing site, located 776 bp and 536 bp upstream of the 5' end of 18S rRNA, respectively, have been determined using S1 analysis. The region surrounding the +1 site shows strong homology between the positions -6 to +10 to the rDNA sites of initiation in radish, maize, and wheat. The sequence CATGCAAA is located 19 bp upstream of the site of initiation, and appears once within each subrepeat and twice more between the end of the subrepeat array and the site of initiation. A previously characterized HpaII site which shows developmental regulation of methylation is located 31 bp downstream of the site of initiation. Using RFLP linkage analysis, the short rDNA length variant of cv. Alaska is assigned to Chromosome 4 where it is genetically independent of the long rDNA length variant which is putatively assigned to Chromosome 7.

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Selected References

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