The presence of sequence variations and polymorphisms in CpG islands of L1 promoters that arise from transition mutations indicates that CpG methylation could play a significant role in determining the activity of L1 elements in the mouse genome.
To align and map the NGS data, biologists often randomly select a number of aligners without concerning their suitable feature, high performance, and high accuracy as well as sequence variations and polymorphisms existing on reference genome.
The results of this study indicate moderate genetic variation and polymorphism across the loci.
Despite a growing interest in the ecological and macro-evolutionary consequences of phenotypic variation and polymorphism [3], [5], [7], [8], [9], [10], little experimental evidence is available to confirm that productivity and individual performance is higher in groups of mixed phenotypes.
This analysis also allowed us to confirm the observed correlation between LCR size variation and polymorphism within flanking sequences.
Interspecific hybridization presents the opportunity to distinguish the effects of nucleotide sequence variation associated with the transcript site (cis variation) and polymorphism in trans-acting regulatory factors.
First, the wide variation and polymorphism of the stress-related symptomatology need to be considered in the global evaluation of our results.
Although there is a strong correlation between the LCR size and nucleotide polymorphism occurring within it (ρ = 0.243, P < 0.001), the correlation between LCR size variation and polymorphism within the LCR is much weaker (ρ = 0.0964, P < 0.001; figure 3).
Highly dynamic diversification of these regions, and high levels of inter-species variation and polymorphism, suggest that newly generated and expanded LCRs are, in most cases, structurally and functionally neutral, with a high probability of fixation [ 12], thus generating novel material that could enable rapid functional expansions.
If our observations are to be extended to the whole genome of S. cephaloptera, the level of structural variation and polymorphism would be an order of magnitude higher than that in the human population with ∼30% of a genomic locus involved.
Two classes of DNA polymorphisms, inter-variety polymorphisms (allelic variations) and inter-homoeologue polymorphisms (IHPs), are usually mixed together.
