Cited by 454Protist diversity and phylogenyChromosomal and Genetic VariationsPhotosynthetic Processes and Mechanisms

The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.

The highly reduced genome of an enslaved algal nucleus

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Abstract

Chromophyte algae differ fundamentally from plants in possessing chloroplasts that contain chlorophyll c and that have a more complex bounding-membrane topology. Although chromophytes are known to be evolutionary chimaeras of a red alga and a non-photosynthetic host, which gave rise to their exceptional membrane complexity, their cell biology is poorly understood. Cryptomonads are the only chromophytes that still retain the enslaved red algal nucleus as a minute nucleomorph. Here we report complete sequences for all three nucleomorph chromosomes from the cryptomonad Guillardia theta. This tiny 551-kilobase eukaryotic genome is the most gene-dense known, with only 17 diminutive spliceosomal introns and 44 overlapping genes. Marked evolutionary compaction hundreds of millions of years ago eliminated nearly all the nucleomorph genes for metabolic functions, but left 30 for chloroplast-located proteins. To allow expression of these proteins, nucleomorphs retain hundreds of genetic-housekeeping genes. Nucleomorph DNA replication and periplastid protein synthesis require the import of many nuclear gene products across endoplasmic reticulum and periplastid membranes. The chromosomes have centromeres, but possibly only one loop domain, offering a means for studying eukaryotic chromosome replication, segregation and evolution.

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Metadata

Authors
Douglas, S., Zauner, S., Fraunholz, M., Beaton, M., Penny, S., Deng, L.-T., Wu, X., Reith, M., Cavalier-Smith, T., & Maier, U.-G.
Affiliations
  • Canadian Institute for Advanced Research (CA)
  • Philipps University of Marburg (DE)
Venue
Nature
Published
2001-04-26
Volume
410
Issue
6832
Pages
1091-1096
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1582655487
Cited by
454
References
31
Citations by year
2026: 4 · 2025: 2 · 2024: 9 · 2023: 9 · 2022: 5 · 2021: 5 · 2020: 12 · 2019: 10 · 2018: 9 · 2017: 13 · 2016: 12 · 2015: 11 · 2014: 22 · 2013: 23 · 2012: 21
FWCI
12.14
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Wellcome Trust
  • European Commission
  • Natural Sciences and Engineering Research Council of Canada
  • Natural Environment Research Council
Topics
  • Life Sciences › Agricultural and Biological Sciences › Ecology, Evolution, Behavior and Systematics › Protist diversity and phylogeny
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Chromosomal and Genetic Variations
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
Keywords
nucleomorph, cryptophytes, Guillardia theta, genome reduction, spliceosomal introns, chloroplast proteins, centromere, chromosome replication, chromosome segregation, endoplasmic reticulum
MeSH terms
Cyanobacteria, Rhodophyta, Base Sequence, Cell Nucleus, Chloroplasts, Chromosome Mapping, Molecular Sequence Data, Symbiosis, Genome, Sequence Analysis, DNA, Eukaryota

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