Occurrence of 9 homologous repeat units in the external spacer region of a nuclear maize rRNA gene unit

A 14 kb maize DNA fragment carrying nuclear rRNA genes and spacer regions was isolated and characterised by restriction enzyme mapping. A complete 3020 bp long external spacer region was sequenced and revealed 9 tandemly arranged 200 bp long repeat units with high homology. The repeat units lie upst...

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Bibliographic Details
Published in:Nucleic acids research 1986-06, Vol.14 (12), p.4969-4986
Main Authors: Toloczyki, Christian, Feix, Günter
Format: Article
Language:English
Subjects:
Base Sequence
Biological and medical sciences
Chromosome Mapping
Cloning, Molecular
DNA Restriction Enzymes
DNA, Ribosomal - genetics
Endonucleases
Fundamental and applied biological sciences. Psychology
Genes. Genome
Molecular and cellular biology
Molecular genetics
Repetitive Sequences, Nucleic Acid
RNA, Ribosomal - genetics
Sequence Homology, Nucleic Acid
Single-Strand Specific DNA and RNA Endonucleases
Triticum - genetics
Zea mays
Zea mays - genetics
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Summary:A 14 kb maize DNA fragment carrying nuclear rRNA genes and spacer regions was isolated and characterised by restriction enzyme mapping. A complete 3020 bp long external spacer region was sequenced and revealed 9 tandemly arranged 200 bp long repeat units with high homology. The repeat units lie upstream from two prominent S1 mapping signals. The sequence of a typical repeat unit is compared to a corresponding 130 bp long wheat repeat unit. The possible functional relevance of the repeat units is discussed.
ISSN:0305-1048
1362-4962
DOI:10.1093/nar/14.12.4969