Related Experiment Video
Updated: May 1, 2026
13:51
Analyzing Gene Expression from Marine Microbial Communities using Environmental Transcriptomics
Published on: February 18, 2009
12.0K
Comparative transcriptomics of two environmentally relevant cyanobacteria reveals unexpected transcriptome diversity.
Karsten Voigt1, Cynthia M Sharma2, Jan Mitschke1
1Faculty of Biology, University of Freiburg, Freiburg, Germany.
The ISME Journal
|April 18, 2014
Summary
Marine cyanobacteria Prochlorococcus exhibit extensive antisense transcription, with over 75% of genes transcribed from both strands. This reveals significant gene expression complexity in these abundant ocean microbes.
Area of Science:
- Marine microbiology
- Genomics
- Transcriptomics
Background:
- Prochlorococcus are abundant, ecologically vital marine cyanobacteria.
- Two strains, adapted to high- and low-light, represent major ecotypes.
- Their transcriptomes show adaptations to specific environmental constraints.
Purpose of the Study:
- Compare transcriptome structure and composition of two Prochlorococcus strains.
- Map genome-wide transcriptional start sites (TSS) for both strains.
- Investigate gene expression complexity and regulation.
Main Methods:
- Genome-wide mapping of transcriptional start sites (TSS).
- Comparative analysis of transcriptome data between two Prochlorococcus strains (MED4 and MIT9313).
- Analysis of 5' untranslated regions and translation initiation mechanisms.
Main Results:
- Antisense transcription observed for ~75% of genes, exceeding other bacteria.
- Hundreds of TSS found within genes, including prochlorosin genes.
- Very little conservation in TSS location and non-coding transcripts between strains.
- Extremely short 5' untranslated regions detected (median 27-29 nt).
- Leaderless and S1-dependent translation suggested as initiation mechanisms.
Conclusions:
- Genome-wide antisense transcription is a major feature of Prochlorococcus.
- Significant complexity and variability in transcriptional architecture exist.
- These findings challenge traditional views of bacterial gene expression.
More Related Videos
Related Concept Videos
01:24Diversity of Archaea II
706
Archaea, one of the three domains of life, exhibit remarkable diversity and adaptability, thriving in both extreme and moderate environments. Historically, most identified archaea have been classified into two major phyla: Euryarchaeota and Crenarchaeota. However, recent molecular studies have expanded this classification to include three additional phyla: Thaumarchaeota, Nanoarchaeota, and Korarchaeota, each exhibiting unique characteristics and ecological roles.Thaumarchaeota: Mesophiles...
706
01:18Deep Sea Microbial Ecology
53
The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
53
01:27Diversity of Protists II
2.3K
Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
2.3K
01:30Bacterial Phylum Cyanobacteria
956
Cyanobacteria are a diverse group of oxygenic, phototrophic bacteria that played a pivotal role in converting Earth’s atmosphere from anoxic to oxygen-rich billions of years ago. They exhibit remarkable morphological diversity, ranging from unicellular forms to filamentous types, with cell sizes varying between 0.5 μm and 100 μm. Cyanobacteria are classified into five groups: Chroococcales (unicellular, dividing by binary fission), Pleurocapsales (unicellular, dividing by...
956
01:27Diversity of Archaea III
502
Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
502
01:30Diversity of Archaea I
957
Archaea, a domain of single-celled microorganisms, are classified into five major phyla based on genetic and biochemical characteristics: Euryarchaeota, Crenarchaeota, Thaumarchaeota, Korarchaeota, and Nanoarchaeota. Among these, the phylum Euryarchaeota is notable for its remarkable diversity in morphology, metabolism, and ecological adaptations.Morphological and Metabolic DiversityMembers of Euryarchaeota exhibit a variety of cellular shapes, including rods and cocci. Their metabolic pathways...
957