Tobacco nuclear DNA contains long tracts of homology to chloroplast DNA

SummaryLong tracts of DNA with high sequence homology to chloroplast DNA were isolated from nuclear genomic libraries of Nicotiana tabacum. One lambda EMBL4 clone was characterised in detail and assigned to nuclear DNA. The majority of the 15.5-kb sequence is greater than 99% homologous with its chloroplast DNA counterpart, but a single base deletion causes premature termination of the reading frame of the psaA gene. One region of the clone contains a concentration of deleted regions, and these were used to identify and quantify the sequence in native nuclear DNA by polymerase chain reaction (PCR) methods. An estimated 15 copies of this specific region are present in a 1c tobacco nucleus.

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