Variation in gene expression within clones of the earthworm Dendrobaena octaedra
Mustonen, M., Haimi, J., Kesäniemi, J., Högmander, H., & Knott, E. (2017). Variation in gene expression within clones of the earthworm Dendrobaena octaedra. PLoS ONE, 12(4), Article e0174960. https://doi.org/10.1371/journal.pone.0174960
Julkaistu sarjassa
PLoS ONEPäivämäärä
2017Tekijänoikeudet
© 2017 Mustonen et al. This is an open access article distributed under the terms of the
Creative Commons Attribution License.
Gene expression is highly plastic, which can help organisms to both acclimate and adapt to
changing environments. Possible variation in gene expression among individuals with the
same genotype (among clones) is not widely considered, even though it could impact the
results of studies that focus on gene expression phenotypes, for example studies using
clonal lines. We examined the extent of within and between clone variation in gene expression
in the earthworm Dendrobaena octaedra, which reproduces through apomictic parthenogenesis.
Five microsatellite markers were developed and used to confirm that offspring
are genetic clones of their parent. After that, expression of 12 genes was measured from
five individuals each from six clonal lines after exposure to copper contaminated soil. Variation
in gene expression was higher over all genotypes than within genotypes, as initially
assumed. A subset of the genes was also examined in the offspring of exposed individuals
in two of the clonal lines. In this case, variation in gene expression within genotypes was as
high as that observed over all genotypes. One gene in particular (chymotrypsin inhibitor)
also showed significant differences in the expression levels among genetically identical individuals.
Gene expression can vary considerably, and the extent of variation may depend on
the genotypes and genes studied. Ensuring a large sample, with many different genotypes,
is critical in studies comparing gene expression phenotypes. Researchers should be especially
cautious inferring gene expression phenotypes when using only a single clonal or
inbred line, since the results might be specific to only certain genotypes.
...
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