The MCMC and TSL methods attempt to remove the effect of ancestral polymorphisms on estimates of the species divergence time.
DOI: http://dx.doi.org/10.7554/eLife.07074.004 A unique feature of the experimental Pseudomonas model is the ability to remove the common pathways from the ancestral SM type without deleterious effect on fitness (McDonald et al., 2009).
The tree topology was fixed, the branch lengths estimated by PhyML were used as the initial values, and alignment gaps and ambiguous letters were removed for the ancestral sequence reconstruction, using the general time-reversible nucleotide substitution model (BASEML parameters: cleandata = 1, fix_blength = 1, model = 7).
These interruptions perhaps remove the expression of CREE-associated genes from ancestral neisserial regulatory networks.
Spent media was produced by growing the ancestral strain REL606 in DM 1 mM glucose without citrate for 24 hours, centrifuging to remove the majority of the cells, and then filtering with a 0.2 μm filter to sterilize.
The algorithm involves grouping of haplotypes (unique sequences) according to shared phylogenetic markers (directed mutations, inferred from the ancestral or outgroup sequence) and removing the minimal set of markers that form homoplasies (incompatible group assignments).
To study the effects of these changes on the network's quantitative function we inferred an ancestral form of the network by removing the GAL1 and GAL3 genes from the S. cerevisiae network and substituting a bi-functional GAL1/3 gene driven by the ancestral promoter for KlacGAL1 [ 21].
On the other hand, the capacity to recover the ancestral chromosome when selection is removed endows the evolved strain with increased evolvability in alternative environments.
This removes the majority of recombinant haplotypes since recombination with the diverse ancestral population typically incorporates several polymorphisms at once.
