Given a table of bar codes, where they map in the genome, and their counts in each sample, we estimate strain fitness and gene fitness values and their reliability with a custom R script (FEBA.R). Roughly, strain fitness is the normalized log2 ratio of counts between the treatment sample (i.e., after growth in a certain medium) and the reference “time-zero” sample. Gene fitness is the weighted average of the strain fitness, and a t score is computed based on the consistency of the strain fitness values for each gene. Ideally, the time-zero and treatment samples are sequenced in the same lane. Also, we usually have multiple replicates of any given time zero, with independent extraction of genomic DNA and independent PCR with a different index. We sum the per-strain counts across replicate time-zero samples.
Genetic Fitness
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Given a table of bar codes, where they map in the genome, and their counts in each sample, we estimate strain fitness and gene fitness values and their reliability with a custom R script (FEBA.R). Roughly, strain fitness is the normalized log2 ratio of counts between the treatment sample (i.e., after growth in a certain medium) and the reference “time-zero” sample. Gene fitness is the weighted average of the strain fitness, and a t score is computed based on the consistency of the strain fitness values for each gene. Ideally, the time-zero and treatment samples are sequenced in the same lane. Also, we usually have multiple replicates of any given time zero, with independent extraction of genomic DNA and independent PCR with a different index. We sum the per-strain counts across replicate time-zero samples.
Preprint). RNAi gene essentiality data from 712 cancer cell lines, encompassing three independent RNAi screening projects (McFarland et al, 2018 (link)), were obtained from (
Nasopharynx colonization experiments were done in 17 mice with eight independently generated libraries each with a size of ∼4000 mutants, while lung infection experiments were done in 20 mice with six libraries each with a size of ∼30,000 mutants. Because of differences in the bacterial load, 105–106 colony forming units (cfu) for nasopharynx and 107–108 cfu for lung, smaller libraries were used for the nasopharynx in order to minimize the stochastic loss of mutants. Mice were euthanized after 24 h for lung infection, followed by removal and homogenization of the lungs, and 48 h for nasopharynx colonization, followed by flushing of the nasopharynx with 500 μL of PBS.
ƒa and ƒb denote the single mutant fitness of gene a and gene b respectively, and ƒab is the fitness of the double knockout mutant of gene a and b. The distribution of ε values follows a distribution such that interactions with higher absolute magnitude and therefore greater interaction strength are rare (
Distribution of genetic interaction scores in DRYGIN. fa and fb denote the single mutant fitness of gene a and b, respectively, and fab is the fitness of the double knockout mutant of gene a and b.
Most recents protocols related to «Genetic Fitness»
with spike protein was performed using a demo version of Genetic Optimization
for Ligand Docking (GOLD). A 3D crystal structure of SARS-CoV-2 spike
protein coupled to angiotensin-converting enzyme 2 (ACE2) (PDB ID:
of 2.45 Å was downloaded from the Protein Data Bank to begin
the docking study. The spike protein with the reference molecule associated
with ACE2 was detached from the 3D structure of the receptor using
Discovery studio30 (link) to perform an in-silico
study. A CIF file of the 2EPCU was converted to an acceptable *mol2
format for use in docking processes. The Hermes visualize is an interface
of the GOLD suite that was used to prepare the 3D structure of spike
protein such as missing loops, side, and chains, adding hydrogen to
amino acids, and deleting water. The position of the reference molecule
coupled to the spike protein was used to confirm the active site for
the spike protein. All other parameters were left at their default
levels, and the complexes were subjected to 10 genetic algorithm runs
using the GOLD Score fitness function. The best-docked pose obtained
from the docking method was employed to visualize the interactions
of the complex with the spike protein using the Discovery studio visualization.
Sequential Least SQuares Programming (SLSQP) [49 ],
Particle Swarm Optimisation (PSO) [50 ], and
Genetic Algorithm (GA) [51 (link)].
When performing the nonlinear optimisation of the FE model, it is desirable that the FEA software can interact with the external programming platform such as MATLAB, Python, and Mathematica, where input files for the analysis are prepared, the FEA job submitted, the FEA results (output files) are checked, and the new input files prepared based on the optimisation algorithm decision. On the other hand, some FEAs, like Ansys [52 ], already include optimisation modules. In this study, Abaqus CAE 2016 [42 ] FEA software was used, with Python 3.7 utilising scipy.optimise.minimise [53 (link)] and pymoo [51 (link)] libraries.
Three independent mariner transposon insertion libraries of S. fredii CCBAU25509 (SF2) were used as input inoculants in three independent experiments. Their 1h-post-inoculation (F1h) and 7d-post-inoculation (F7d) samples on the filter of plant culture dish were used as control samples to those rhizoplane samples of four test plant species (CS7d, WS7d, R7d, and Z7d). To facilitate Tn-seq library construction, all output samples were subject to cultivation in the TY rich medium for 32 h, and the input libraries were cultivated under the same condition as control (TY).
GA-BPNN flow chart.
Next step was calculating a modified Cohen’s D between observed and expected distribution of LFC of gRNAs targeting genes. Expected distribution of gRNAs targeting a gene pair, was calculated using expected mean and expected standard deviation.
Where:
In each cell line, the paralog pairs with dLFC < −1 and Cohen’s D > 0.8 were selected as hits. Cohen’s D more than 0.8 indicates large effect size between two groups, meaning that our expected and observed distribution of gRNAs are meaningfully separated. In total 388 paralog pairs were identified as hits across all the studies.
To identify the most consistent method in terms of hit identification, the Jaccard similarity coefficient of every pair of cell lines in each study was calculated by taking the ratio of intersection of hits over union of hits. For the studies that screened more than two cell lines, the final platform weight was the median of the calculated Jaccard coefficients of all pairs of cell lines.
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