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Cited by 426

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The Chlamydomonas reinhardtii Plastid Chromosome

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Maul, Jude E., Lilly, Jason W., Cui, Liying, dePamphilis, Claude W., Miller, Webb, Harris, Elizabeth H., Stern, David B.·2002·The Plant Cell

Abstract

Chlamydomonas reinhardtii is a unicellular eukaryotic alga possessing a single chloroplast that is widely used as a model system for the study of photosynthetic processes. This report analyzes the surprising structural and evolutionary features of the completely sequenced 203,395-bp plastid chromosome. The genome is divided by 21.2-kb inverted repeats into two single-copy regions of ∼80 kb and contains only 99 genes, including a full complement of tRNAs and atypical genes encoding the RNA polymerase. A remarkable feature is that >20% of the genome is repetitive DNA: the majority of intergenic regions consist of numerous classes of short dispersed repeats (SDRs), which may have structural or evolutionary significance. Among other sequenced chlorophyte plastid genomes, only that of the green alga Chlorella vulgaris appears to share this feature. The program MultiPipMaker was used to compare the genic complement of Chlamydomonas with those of other chloroplast genomes and to scan the genomes for sequence similarities and repetitive DNAs. Among the results was evidence that the SDRs were not derived from extant coding sequences, although some SDRs may have arisen from other genomic fragments. Phylogenetic reconstruction of changes in plastid genome content revealed that an accelerated rate of gene loss also characterized the Chlamydomonas/Chlorella lineage, a phenomenon that might be independent of the proliferation of SDRs. Together, our results reveal a dynamic and unusual plastid genome whose existence in a model organism will allow its features to be tested functionally.

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Metadata

Authors
Maul, J. E., Lilly, J. W., Cui, L., dePamphilis, C. W., Miller, W., Harris, E. H., & Stern, D. B.
Venue
The Plant Cell
Published
2002-11-01
Volume
14
Issue
11
Pages
2659-2679
ISSN
  • 1040-4651 (ISSN-L)
  • 1532-298X
OpenAlex
W2149213980
Cited by
426
References
2
FWCI
6.91
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: The Chlamydomonas reinhardtii Plastid Chromosome. https://app.cochat.ai/papers/10.1105/tpc.006155
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Maul, J. E., Lilly, J. W., Cui, L., dePamphilis, C. W., Miller, W., Harris, E. H., & Stern, D. B. (2002). The Chlamydomonas reinhardtii Plastid Chromosome. The Plant Cell. https://doi.org/10.1105/tpc.006155

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