Summary
A 3.4-kbp nuclear (n) DNA sequence has greater than 99% sequence homology to three segments of the chloroplast (cp) genes rps2, psbD/C, and psaA respectively. Each of these cpDNA segments is less than 3 kbp in length and appears to be integrated, at least in part, into several (>5) different sites flanked by unique sequences in the nuclear genome. Some of these sites contain longer homologies to the particular genes, while others are only homologous to smaller parts of the cp genes. Both the cpDNA fragments found in the nuclear genome and their flanking nDNA sequences are invested with short repeated A-T rich sequences but, apart from a hexanucleotide sequence and a palindromic sequence identified near each recombination point, there is no obvious structure that can suggest a mechanism of DNA transfer from the chloroplast to the nucleus in spinach.
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Communicated by A. L. Kahler
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Cheung, W.Y., Scott, N.S. A contiguous sequence in spinach nuclear DNA is homologous to three separated sequences in chloroplast DNA. Theoret. Appl. Genetics 77, 625–633 (1989). https://doi.org/10.1007/BF00261234
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DOI: https://doi.org/10.1007/BF00261234