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. 1980 Jul 11;8(13):2947–2965. doi: 10.1093/nar/8.13.2947

Transcriptional mapping of the ribosomal RNA region of mouse L-cell mitochondrial DNA.

P Nagley, D A Clayton
PMCID: PMC324137  PMID: 6253898

Abstract

The map positions in mouse mitochondrial DNA of the two ribosomal RNA genes and adjacent genes coding several small transcripts have been determined precisely by application of a procedure in which DNA-RNA hybrids have been subjected to digestion by S1 nuclease under conditions of varying severity. Digestion of the DNA-RNA hybrids with S1 nuclease yielded a series of species which were shown to contain ribosomal RNA molecules together with adjacent transcripts hybridized conjointly to a continuous segment of mitochondrial DNA. There is one small transcript about 60 bases long whose gene adjoins the sequences coding the 5'-end of the small ribosomal RNA (950 bases) and which lies approximately 200 nucleotides from the D-loop origin of heavy strand mitochondrial DNA synthesis. An 80-base transcript lies between the small and large ribosomal RNA genes, and genes for two further short transcript (each about 80 bases in length) abut the sequences coding the 3'-end of the large ribosomal RNA (approximately 1500 bases). The ability to isolate a discrete DNA-RNA hybrid species approximately 2700 base pairs in length containing all these transcripts suggests that there can be few nucleotides in this region of mouse mitochondrial DNA which are not represented as stable RNA species.

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