Evolution of Metallothionein Promoter Alleles in Springtails
Author Information
Author(s): Janssens Thierry KS, Mariën Janine, Cenijn Peter, Legler J, van Straalen Nico M, Roelofs Dick
Primary Institution: Vrije Universiteit Amsterdam
Hypothesis
Are the pmt alleles observed in natural populations differentially induced by Cd, paraquat and 20-hydroxyecdysone (molting hormone) and can their induction be related to their different architecture?
Conclusion
The structural differences in the Orchesella cincta metallothionein promoter alleles contribute to the metallothionein-over-expresser phenotype in cadmium tolerant populations.
Supporting Evidence
- Nine pmt alleles were discovered in NW-European populations.
- Extensive recombination events between some of the alleles were inferred.
- A deviation from neutral expectations was detected in a cadmium tolerant population.
Takeaway
This study found that different versions of a gene's promoter in springtails help them deal with heavy metals like cadmium, showing how nature can adapt to pollution.
Methodology
The study sequenced approximately 1600 bp upstream of the metallothionein coding region and analyzed the functional significance of nine different promoter alleles using luciferase reporter assays.
Limitations
The study was conducted in a Drosophila cell line, which may not fully reflect in vivo conditions in Orchesella cincta.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website