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Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
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Cell Size01:22

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Cell sizes vary widely among and within organisms. Bacterial cells range between 1-10 micrometers (μm)and are considerably smaller than most eukaryotic cells. The smallest bacteria are 0.1 μm in diameter—about a thousand times smaller than eukaryotic cells, which typically range from 10-100 μm.
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Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
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Brick sizing plays a crucial role in construction, influencing both the aesthetics and structural integrity of buildings. Bricks are defined by three dimensions: width, thickness, and length. They are commonly designed to fit modular measurements, typically in multiples of 4 inches or 8 inches in width, to facilitate uniform construction and compatibility with other building materials.
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Microfabrication of Chip-sized Scaffolds for Three-dimensional Cell cultivation
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Does Cell Size Impact Chloroplast Genome Size?

David R Smith1

  • 1Department of Biology, University of Western Ontario, London, ON, Canada.

Frontiers in Plant Science
|January 10, 2018
PubMed
Summary

Cell size and chloroplast genome size may be linked in algae. This study explores the potential relationship between cellular and organelle genome architecture in green algae.

Area of Science:

  • Cell Biology
  • Genomics
  • Phycology

Background:

  • A positive correlation exists between nuclear genome size and cell size in eukaryotes.
  • This cell size-DNA content coupling is observed in bacteria, suggesting a broad biological principle.
  • The relationship between cell size and organelle genome size, particularly chloroplasts, remains under-explored due to limited data.

Purpose of the Study:

  • To investigate the potential positive scaling relationship between cell size and chloroplast genome size in plastid-bearing protists.
  • To examine this relationship within specific groups of green algae, including ulvophytes, prasinophytes, and trebouxiophytes.
  • To highlight the need for further research into the connection between cellular and organelle genome architecture.

Main Methods:

Keywords:
AcetabulariaDNA contentcell sizegenome sizeplastid genome

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  • Speculative analysis based on existing data and examples.
  • Comparative examination of cell morphology and chloroplast DNA content in selected algal groups.
  • Literature review and data synthesis to identify trends and exceptions.

    • Main Results:

    • Examples were found where larger cell sizes correlate with larger chloroplast genomes, and smaller cell sizes with smaller chloroplast genomes.
    • Instances were also identified where this positive trend between cell size and chloroplast genome size does not hold true.
    • The data suggests a complex and not universally consistent relationship.

    Conclusions:

    • A potential positive scaling between cell size and chloroplast genome size in certain algal lineages warrants further investigation.
    • The interplay between cellular architecture and organelle genome architecture is a significant area for future research.
    • Researchers should maintain an open perspective when exploring these relationships in diverse protists.