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. 1985 Jan 25;13(2):537–556. doi: 10.1093/nar/13.2.537

Structure of the sea urchin U1 RNA repeat.

D T Brown, G F Morris, N Chodchoy, C Sprecher, W F Marzluff
PMCID: PMC341013  PMID: 2582356

Abstract

The genes coding for U1 RNA in the sea urchin L. variegatus are present in a 1400 base pair tandem repeat. One member of the repeat has been cloned and its sequence determined. The repeat unit contains a single copy of the gene for L. variegatus U1 RNA. This gene encodes an RNA which is 75% homologous to mammalian U1 RNA. The L. variegatus U1 RNA could assume a secondary structure similar to that proposed for other U1 RNAs. In addition the L. variegatus U1 RNA is precipitated by anti-SM and anti-RNP antisera. Analysis of the L. variegatus genomic DNA using the cloned U1 gene as a probe reveals a major and a minor type of repeat unit. The two repeated units are the same length but differ in a number of restriction enzyme sites clustered 200-500 bases down-stream from the gene. The monomer we have cloned and sequenced is a representative of the minor repeat. A sequence (GATAA) which is -41 to -37 bases 5' to the gene has homology to the putative RNA polymerase II promoter. Fifteen bases 3' of the gene is a sequence (CAAAGAAAGAAAA) which is very similar to the sequence found 3' of the sea urchin histone genes. The two Hha I, Hpa II and Ava I sites in the repeat are all unmethylated in sperm DNA.

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