Gene 1988 Apr 15;641:53-63. doi: 10.1016/0378-1119(88)90480-5.

Structure of an unusual sea urchin U1 RNA gene cluster.

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Genomic clones containing multiple copies of the Lytechinus variegatus U1 gene have been isolated from a gene library in the phage lambda EMBL3. These clones contain both types of U1 RNA gene repeats interspersed in the same 15-kb fragment. In addition, about 1/3 of the repeat units contain a 260-bp insert 460 bp prior to the first nucleotide of the U1 RNA sequence. The inserted sequence is abundant in the sea urchin genome as judged by Southern blots of genomic DNA. There are no repeated sequences flanking the insert. The insert occurs at the same position in the highly conserved 5''-flanking region at which a deletion has previously been reported.

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Genes referenced: LOC100887844