Summary
A 3454 base pair (bp) sequence of the large inverted repeat (IR) of chloroplast DNA (cpDNA) from the unicellular green alga Chlorella ellipsoidea has been determined. The sequence includes: (1) the boundaries between the IR and the large single copy (LSC) and the small single copy (SSC) regions, (2) the gene for psbA and (3) an approximately 1.0 kbp region between psbA and the rRNA genes which contains a variety of short dispersed repeats. The total size of the Chlorella IR was determined to be 15243 bp. The junction between the IR and the small single copy region is located close to the putative promoter of the rRNA operon (906 bp upstream of the-35 sequence on each IR). The junction between the IR and the large single copy region is also just upstream of the putative psbA promoter, 218 bp upstream from the ATG initiation codon. A few sets of unique sequences were found repeatedly around both junctions. Some of the sequences flanking the IR-LSC junction suggest a unidirectional and serial expansion of the IR within the genome. The psbA gene is located close to the LSC-side junction and codes for a protein of 352 amino acid residues. A highly conserved C-terminal Gly is absent. Unlike the psbA of Chlamydomonas species, which contains 2–4 large introns, the gene of Chlorella has no introns. The overall gene organization of the Chlorella IR is very different from that of higher plants, but a similar gene cluster of rrn-psbA is also found in the IR of Chlamydomonas species and in a single copy region of some chlorophyll a/c-containing algae, indicating a common evolutionary lineage of these cpDNAs. The origin and evolution of the IR structure are discussed in the light of these observations.
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Communicated by C. S. Levings III
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Yamada, T. Repetitive sequence-mediated rearragements in Chlorella ellipsoidea chloroplast DNA: completion of nucleotide sequence of the large inverted repeat. Curr Genet 19, 139–147 (1991). https://doi.org/10.1007/BF00326295
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DOI: https://doi.org/10.1007/BF00326295