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. 1991 Mar 11;19(5):1093–1098. doi: 10.1093/nar/19.5.1093

The U1 snRNA gene repeat from the sea urchin (Strongylocentrotus purpuratus): the 70 kilobase tandem repeat ends directly 3' to a U1 gene.

J C Yu 1, B Wendelburg 1, S Sakallah 1, W F Marzluff 1
PMCID: PMC333786  PMID: 2020546

Abstract

Lambda phage clones containing multiple copies of the 1.1 kb tandemly repeated unit of the sea urchin (S. purpuratus) U1 RNA genes were isolated from a gene library. The 1.1 kb repeat unit encodes a single copy of the predominant U1 RNA expressed in oocytes and embryos prior to the blastula stage. The tandem repeat unit is about 80 kb in size and is probably present one time per haploid genome as judged by pulsed-field electrophoresis of sperm DNA digested with restriction enzymes which do not cut in the repeat unit. Two of the phage contained DNA flanking the repeat unit as well as several repeat units. The tandem repeat unit ends just 3' to the U1 coding region. There is only limited homology in the 5' flanking region with U1 snRNA genes from the sea urchin L. variegatus.

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Selected References

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