1 Sample Information

Analysis from the results of a label free mass spectrometry experiment on paraffin embedded samples stratified as follows:

1.1 Third Batch of Samples: Etiology criteria

  • LAA Clots (LAA): n = 6
  • Cardioembolic clots (CE): n = 6

2 Coverage Analysis

The coverage analysis result was conducted here on both data sets, and the summary statistics of the coverage score for each sample is shown on the tables below, and based on that and the plots we can see a similar behaviour regarding the coverage.

Third batch of samples: Etiology
laa1 laa2 laa3 laa4 laa5 laa6 ce1 ce2 ce3 ce4 ce5 ce6
Min. 0.25000 0.05000 0.24000 0.19000 0.04000 0.30000 0.04000 0.13000 0.15000 0.26000 0.6500 0.45000
1st Qu. 5.13000 4.47000 4.57000 4.79500 4.54000 4.11250 4.28000 4.03500 4.28000 3.28250 5.3725 5.03000
Median 11.00000 10.29000 9.59000 9.57000 9.75000 8.73000 9.72000 8.95000 9.78000 7.31500 7.1800 10.31000
Mean 14.88716 14.42899 14.31953 15.98963 14.78163 13.55094 14.25736 14.02422 14.81137 11.51224 15.4750 15.23341
3rd Qu. 20.05000 19.16000 18.89000 22.23500 20.30000 17.94250 19.76000 19.26000 19.21000 14.51500 13.2950 21.08750
Max. 97.28000 97.28000 97.28000 63.27000 100.00000 97.28000 97.28000 97.28000 95.92000 68.47000 87.7600 66.90000

The Venn Diagram generated using the second data set shows that 101 proteins are overlapping between the RBC and FIB Groups - and this intersection is used for comparison between groups, 60 proteins are unique to the RBC samples, and 115 proteins are unique to the FIB samples.

3 RBC Analysis

3.1 Pearson correlation

Using the correlation matrix above to extract information on the abundancy profile of the top 50 highly correlated proteins with a threshold of +/- 0.80, the network analysis was carried out and resulted in the graph below. The node size is proportional with the degree (how connected the protein is), the red edges represent positive correlation and blue edges represent negative correlation. The optimal community structure was calculated for the graph, in using the maximal modularity score.This analysis resulted in the six communities represented as the node colours and shown in the table below.

3.2 Network Analysis



4 CE Analysis

4.1 Pearson correlation

4.2 Network analysis

The same method for constructing the co-expression network used on the RBC samples was applied to the FIB dataset here, in this case using the 115 proteins unique to FIB samples from the second batch. The optimal community analysis resulted in three communities listed in the table below.

5 Differential Analysis

Here I used a linear model approach to assess differential abundance/expression between the two groups - this analysis resulted in 40 differentially abundant proteins. The tables below show the metrics of the top-ranked proteins from the linear model fit. The data was pre-processed with log-transformation and quantile normalisation to ensure that the expression distributions of each sample are similar across the entire experiment and not skewed.