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    Plant Mol Biol. 2001 Feb;45(3):307-15.

    The plastid chromosome of spinach (Spinacia oleracea): complete nucleotide sequence and gene organization.

    Schmitz-Linneweber C, Maier RM, Alcaraz JP, Cottet A, Herrmann RG, Mache R.

    Botanisches Institut der Ludwig-Maximilians-Universität, München, Germany.

    The chloroplast chromosome of spinach (Spinacia oleracea) is a double-stranded circular DNA molecule of 150,725 nucleotide pairs. A comparison of this chromosome with those of the three other autotrophic dicotyledons for which complete DNA sequences of plastid chromosomes are available confirms a conserved overall structure. Three classes of open reading frames were distinguished: (1) genes of known function which include 108 unique loci, (2) three hypothetical chloroplast reading frames (ycfs) that are highly conserved interspecifically, and (3) species-specific or rapidly diverging 'open reading frames'. A detailed transcript study of one of the latter (ycf15) shows that these loci may be transcribed, but do not constitute protein-coding genes.

    PMID: 11292076 [PubMed - indexed for MEDLINE]

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