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Published on: July 30, 2011
Normalisation genes for expression analyses in the brown alga model Ectocarpus siliculosus
Aude Le Bail1, Simon M Dittami, Pierre-Olivier de Franco
1UPMC Univ Paris 6, UMR 7139 Végétaux marins et Biomolécules, Station Biologique, F 29682, Roscoff, France. lebail@sb-roscoff.fr
BMC Molecular Biology
|August 20, 2008
Summary
For accurate gene expression studies in brown algae, elongation factor 1-alpha (EF1a) is the best reference gene. It should be used with partners like alpha tubulin or ubiquitin-conjugating enzyme for reliable normalisation.
Area of Science:
- Marine Biology
- Molecular Biology
- Genomics
Background:
- Brown algae are vital coastal multicellular organisms with significant ecological roles.
- Ectocarpus siliculosus is a key model organism for brown algal research, with a sequenced genome and developing molecular tools.
- Understanding brown algal adaptive responses to environmental changes, such as osmotic stress and pollutants, is crucial.
Purpose of the Study:
- To identify reliable reference genes for normalizing gene expression analyses in Ectocarpus siliculosus.
- To evaluate the stability of 13 candidate genes under diverse culture conditions.
- To provide a foundation for accurate transcriptomic studies in brown algae.
Main Methods:
- Expression levels of 13 candidate genes were monitored across 21 different culture conditions.
- Candidate genes included those involved in protein translation, degradation, folding, cytoskeleton structure, and carbon metabolism.
- Gene expression stability was assessed using Ct range, geNorm, and Normfinder algorithms.
Main Results:
- Elongation factor 1-alpha (EF1a) demonstrated the most stable expression across tested conditions.
- Actin was identified as an unreliable gene for normalization.
- Combinations of EF1a with alpha tubulin, ubiquitin-conjugating enzyme, or actin-related proteins were found to be suitable for calculating normalization factors.
Conclusions:
- EF1a is the recommended reference gene for accurate gene expression normalization in Ectocarpus siliculosus.
- Using at least two genes, such as EF1a combined with alpha tubulin or ubiquitin-conjugating enzyme, is advised for robust normalization.
- These findings will enhance the reliability of transcriptomic studies in brown algae, aiding research into their environmental adaptability.
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