The nucleotide sequence of the initiation region of the ribosomal transcription unit from mouse.

AUTOR(ES)

Bach, R

RESUMO

The 5' end of 45S pre-rRNA has been located on a cloned rDNA fragment from mouse by r-loop mapping and the nuclease S1 protection technique. 45S pre-rRNA could be shown to represent the primary transcript of the ribosomal genes because 5' polyphosphate termini have been detected by an enzymatic assay. The sequence of about 1100 nucleotides surrounding the initiation site for ribosomal RNA transcription has been determined. Features of this region of the ribosomal DNA will be discussed. A comparison of the nucleotide sequence with corresponding areas of ribosomal genes from other eukaryotes does not reveal significant homology in the region of transcription initiation.

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